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FFmpeg
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per context frame_rate_base, this should finally fix frame_rate related av sync issues 

Originally committed as revision 1666 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Michael Niedermayer 22 years ago
parent
586bc7553c
commit
14bea432f1
33 changed files with 282 additions and 148 deletions
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  1. +27
    -13
      ffmpeg.c
  2. +11
    -6
      ffserver.c
  3. +2
    -1
      libavcodec/apiexample.c
  4. +25
    -4
      libavcodec/avcodec.h
  5. +1
    -1
      libavcodec/common.c
  6. +1
    -1
      libavcodec/common.h
  7. +3
    -2
      libavcodec/dv.c
  8. +6
    -6
      libavcodec/h263.c
  9. +22
    -15
      libavcodec/mpeg12.c
  10. +22
    -10
      libavcodec/mpeg12data.h
  11. +2
    -2
      libavcodec/mpegvideo.c
  12. +0
    -1
      libavcodec/mpegvideo.h
  13. +1
    -1
      libavcodec/msmpeg4.c
  14. +4
    -4
      libavcodec/ratecontrol.c
  15. +62
    -2
      libavcodec/utils.c
  16. +1
    -1
      libavcodec/wmv2.c
  17. +1
    -2
      libavformat/asf.c
  18. +2
    -2
      libavformat/avformat.h
  19. +10
    -6
      libavformat/avidec.c
  20. +3
    -7
      libavformat/avienc.c
  21. +2
    -1
      libavformat/dv1394.c
  22. +5
    -10
      libavformat/ffm.c
  23. +3
    -3
      libavformat/gif.c
  24. +2
    -1
      libavformat/gifdec.c
  25. +9
    -5
      libavformat/grab.c
  26. +8
    -5
      libavformat/img.c
  27. +4
    -4
      libavformat/mov.c
  28. +6
    -3
      libavformat/raw.c
  29. +3
    -2
      libavformat/rm.c
  30. +2
    -4
      libavformat/rtp.c
  31. +7
    -5
      libavformat/swf.c
  32. +11
    -12
      libavformat/utils.c
  33. +14
    -6
      libavformat/yuv4mpeg.c

+ 27
- 13
ffmpeg.c View File

@@ -90,7 +90,8 @@ static int frame_topBand = 0;
static int frame_bottomBand = 0;
static int frame_leftBand = 0;
static int frame_rightBand = 0;
static int frame_rate = 25 * FRAME_RATE_BASE;
static int frame_rate = 25;
static int frame_rate_base = 1;
static int video_bit_rate = 200*1000;
static int video_bit_rate_tolerance = 4000*1000;
static int video_qscale = 0;
@@ -746,7 +747,7 @@ static void do_video_stats(AVFormatContext *os, AVOutputStream *ost,
if (ti1 < 0.01)
ti1 = 0.01;
bitrate = (double)(frame_size * 8) * enc->frame_rate / FRAME_RATE_BASE / 1000.0;
bitrate = (double)(frame_size * 8) * enc->frame_rate / enc->frame_rate_base / 1000.0;
avg_bitrate = (double)(total_size * 8) / ti1 / 1000.0;
fprintf(fvstats, "s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s ",
(double)total_size / 1024, ti1, bitrate, avg_bitrate);
@@ -974,6 +975,7 @@ static int av_encode(AVFormatContext **output_files,
break;
case CODEC_TYPE_VIDEO:
codec->frame_rate = icodec->frame_rate;
codec->frame_rate_base = icodec->frame_rate_base;
codec->width = icodec->width;
codec->height = icodec->height;
break;
@@ -1361,7 +1363,7 @@ static int av_encode(AVFormatContext **output_files,

/* frame rate emulation */
if (ist->st->codec.rate_emu) {
int64_t pts = ((int64_t) ist->frame * FRAME_RATE_BASE * 1000000) / (ist->st->codec.frame_rate);
int64_t pts = av_rescale((int64_t) ist->frame * ist->st->codec.frame_rate_base, 1000000, ist->st->codec.frame_rate);
int64_t now = av_gettime() - ist->start;
if (pts > now)
usleep(pts - now);
@@ -1673,7 +1675,9 @@ static void opt_debug(const char *arg)

static void opt_frame_rate(const char *arg)
{
frame_rate = (int)(strtod(arg, 0) * FRAME_RATE_BASE);
frame_rate_base = DEFAULT_FRAME_RATE_BASE; //FIXME not optimal
frame_rate = (int)(strtod(arg, 0) * frame_rate_base + 0.5);
//FIXME parse fractions
}


@@ -2051,7 +2055,7 @@ static void opt_input_file(const char *filename)
{
AVFormatContext *ic;
AVFormatParameters params, *ap = &params;
int err, i, ret, rfps;
int err, i, ret, rfps, rfps_base;

if (!strcmp(filename, "-"))
filename = "pipe:";
@@ -2061,6 +2065,7 @@ static void opt_input_file(const char *filename)
ap->sample_rate = audio_sample_rate;
ap->channels = audio_channels;
ap->frame_rate = frame_rate;
ap->frame_rate_base = frame_rate_base;
ap->width = frame_width;
ap->height = frame_height;
ap->image_format = image_format;
@@ -2092,7 +2097,8 @@ static void opt_input_file(const char *filename)
case CODEC_TYPE_VIDEO:
frame_height = enc->height;
frame_width = enc->width;
rfps = ic->streams[i]->r_frame_rate;
rfps = ic->streams[i]->r_frame_rate;
rfps_base = ic->streams[i]->r_frame_rate_base;
enc->workaround_bugs = workaround_bugs;
enc->error_resilience = error_resilience;
enc->error_concealment = error_concealment;
@@ -2106,13 +2112,15 @@ static void opt_input_file(const char *filename)
if(bitexact)
enc->flags|= CODEC_FLAG_BITEXACT;

if (enc->frame_rate != rfps) {
assert(enc->frame_rate_base == rfps_base); // should be true for now
if (enc->frame_rate != rfps) {
fprintf(stderr,"\nSeems that stream %d comes from film source: %2.2f->%2.2f\n",
i, (float)enc->frame_rate / FRAME_RATE_BASE,
(float)rfps / FRAME_RATE_BASE);
i, (float)enc->frame_rate / enc->frame_rate_base,
(float)rfps / rfps_base);
}
/* update the current frame rate to match the stream frame rate */
frame_rate = rfps;
frame_rate = rfps;
frame_rate_base = rfps_base;

enc->rate_emu = rate_emu;
break;
@@ -2241,6 +2249,7 @@ static void opt_output_file(const char *filename)
video_enc->bit_rate = video_bit_rate;
video_enc->bit_rate_tolerance = video_bit_rate_tolerance;
video_enc->frame_rate = frame_rate;
video_enc->frame_rate_base = frame_rate_base;
video_enc->width = frame_width;
video_enc->height = frame_height;
@@ -2492,8 +2501,12 @@ static void prepare_grab(void)
vp->width = enc->width;
if (enc->height > vp->height)
vp->height = enc->height;
if (enc->frame_rate > vp->frame_rate)
vp->frame_rate = enc->frame_rate;
assert(enc->frame_rate_base == DEFAULT_FRAME_RATE_BASE);
if (enc->frame_rate > vp->frame_rate){
vp->frame_rate = enc->frame_rate;
vp->frame_rate_base = enc->frame_rate_base;
}
has_video = 1;
break;
default:
@@ -2517,7 +2530,8 @@ static void prepare_grab(void)
exit(1);
}
/* by now video grab has one stream */
ic->streams[0]->r_frame_rate = vp->frame_rate;
ic->streams[0]->r_frame_rate = vp->frame_rate;
ic->streams[0]->r_frame_rate_base = vp->frame_rate_base;
input_files[nb_input_files] = ic;
dump_format(ic, nb_input_files, "", 0);
nb_input_files++;


+ 11
- 6
ffserver.c View File

@@ -1725,7 +1725,7 @@ static void compute_stats(HTTPContext *c)
case CODEC_TYPE_VIDEO:
type = "video";
sprintf(parameters, "%dx%d, q=%d-%d, fps=%d", st->codec.width, st->codec.height,
st->codec.qmin, st->codec.qmax, st->codec.frame_rate / FRAME_RATE_BASE);
st->codec.qmin, st->codec.qmax, st->codec.frame_rate / st->codec.frame_rate_base);
break;
default:
av_abort();
@@ -1950,7 +1950,7 @@ int av_read_frame(AVFormatContext *s, AVPacket *pkt)
(int64_t)s->pts_num * st->codec.sample_rate);
break;
case CODEC_TYPE_VIDEO:
st->pts_incr = (int64_t)s->pts_den * FRAME_RATE_BASE;
st->pts_incr = (int64_t)s->pts_den * st->codec.frame_rate_base;
av_frac_init(&st->pts, st->pts.val, 0,
(int64_t)s->pts_num * st->codec.frame_rate);
break;
@@ -2018,7 +2018,7 @@ int av_read_frame(AVFormatContext *s, AVPacket *pkt)
(int64_t)s->pts_num * st->codec.sample_rate);
break;
case CODEC_TYPE_VIDEO:
st->pts_incr = (int64_t)s->pts_den * FRAME_RATE_BASE;
st->pts_incr = (int64_t)s->pts_den * st->codec.frame_rate_base;
av_frac_init(&st->pts, st->pts.val, 0,
(int64_t)s->pts_num * st->codec.frame_rate);
break;
@@ -3219,6 +3219,7 @@ static int add_av_stream(FFStream *feed, AVStream *st)
if (av1->width == av->width &&
av1->height == av->height &&
av1->frame_rate == av->frame_rate &&
av1->frame_rate_base == av->frame_rate_base &&
av1->gop_size == av->gop_size)
goto found;
break;
@@ -3406,6 +3407,7 @@ static void build_feed_streams(void)
matches = 0;
} else if (ccf->codec_type == CODEC_TYPE_VIDEO) {
if (CHECK_CODEC(frame_rate) ||
CHECK_CODEC(frame_rate_base) ||
CHECK_CODEC(width) ||
CHECK_CODEC(height)) {
printf("Codec width, height and framerate do not match for stream %d\n", i);
@@ -3553,8 +3555,10 @@ static void add_codec(FFStream *stream, AVCodecContext *av)
case CODEC_TYPE_VIDEO:
if (av->bit_rate == 0)
av->bit_rate = 64000;
if (av->frame_rate == 0)
av->frame_rate = 5 * FRAME_RATE_BASE;
if (av->frame_rate == 0){
av->frame_rate = 5;
av->frame_rate_base = 1;
}
if (av->width == 0 || av->height == 0) {
av->width = 160;
av->height = 128;
@@ -4017,7 +4021,8 @@ static int parse_ffconfig(const char *filename)
} else if (!strcasecmp(cmd, "VideoFrameRate")) {
get_arg(arg, sizeof(arg), &p);
if (stream) {
video_enc.frame_rate = (int)(strtod(arg, NULL) * FRAME_RATE_BASE);
video_enc.frame_rate_base= DEFAULT_FRAME_RATE_BASE;
video_enc.frame_rate = (int)(strtod(arg, NULL) * video_enc.frame_rate_base);
}
} else if (!strcasecmp(cmd, "VideoGopSize")) {
get_arg(arg, sizeof(arg), &p);


+ 2
- 1
libavcodec/apiexample.c View File

@@ -192,7 +192,8 @@ void video_encode_example(const char *filename)
c->width = 352;
c->height = 288;
/* frames per second */
c->frame_rate = 25 * FRAME_RATE_BASE;
c->frame_rate = 25;
c->frame_rate_base= 1;
c->gop_size = 10; /* emit one intra frame every ten frames */

/* open it */


+ 25
- 4
libavcodec/avcodec.h View File

@@ -186,8 +186,6 @@ static const int Motion_Est_QTab[] = { ME_ZERO, ME_PHODS, ME_LOG,
#define CODEC_CAP_PARSE_ONLY 0x0004
#define CODEC_CAP_TRUNCATED 0x0008

#define FRAME_RATE_BASE 10010

#define FF_COMMON_FRAME \
uint8_t *data[4];\
int linesize[4];\
@@ -321,6 +319,7 @@ typedef struct AVFrame {
FF_COMMON_FRAME
} AVFrame;

#define DEFAULT_FRAME_RATE_BASE 1001000

/**
* main external api structure.
@@ -375,13 +374,21 @@ typedef struct AVCodecContext {
/* video only */
/**
* frames per sec multiplied by FRAME_RATE_BASE.
* frames per sec multiplied by frame_rate_base.
* for variable fps this is the precission, so if the timestamps
* can be specified in msec precssion then this is 1000*FRAME_RATE_BASE
* can be specified in msec precssion then this is 1000*frame_rate_base
* - encoding: MUST be set by user
* - decoding: set by lavc. 0 or the frame_rate if available
*/
int frame_rate;
/**
* frame_rate_base.
* for variable fps this is 1
* - encoding: set by user.
* - decoding: set by lavc.
*/
int frame_rate_base;

/**
* width / height.
@@ -1258,6 +1265,20 @@ void avcodec_register_all(void);

void avcodec_flush_buffers(AVCodecContext *avctx);

/* misc usefull functions */
/**
* reduce a fraction.
* this is usefull for framerate calculations
* @param max the maximum allowed for dst_nom & dst_den
* @return 1 if exact, 0 otherwise
*/
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max);

/**
* rescale a 64bit integer.
* a simple a*b/c isnt possible as it can overflow
*/
int64_t av_rescale(int64_t a, int b, int c);


/**


+ 1
- 1
libavcodec/common.c View File

@@ -341,7 +341,7 @@ void free_vlc(VLC *vlc)
av_free(vlc->table);
}

int ff_gcd(int a, int b){
int64_t ff_gcd(int64_t a, int64_t b){
if(b) return ff_gcd(b, a%b);
else return a;
}


+ 1
- 1
libavcodec/common.h View File

@@ -876,7 +876,7 @@ static inline int clip(int a, int amin, int amax)
/* math */
extern const uint8_t ff_sqrt_tab[128];

int ff_gcd(int a, int b);
int64_t ff_gcd(int64_t a, int64_t b);

static inline int ff_sqrt(int a)
{


+ 3
- 2
libavcodec/dv.c View File

@@ -537,16 +537,17 @@ static int dvvideo_decode_frame(AVCodecContext *avctx,
/* init size */
width = 720;
if (dsf) {
avctx->frame_rate = 25 * FRAME_RATE_BASE;
avctx->frame_rate = 25;
packet_size = PAL_FRAME_SIZE;
height = 576;
nb_dif_segs = 12;
} else {
avctx->frame_rate = 30 * FRAME_RATE_BASE;
avctx->frame_rate = 30;
packet_size = NTSC_FRAME_SIZE;
height = 480;
nb_dif_segs = 10;
}
avctx->frame_rate_base= 1;
/* NOTE: we only accept several full frames */
if (buf_size < packet_size)
return -1;


+ 6
- 6
libavcodec/h263.c View File

@@ -164,8 +164,8 @@ void h263_encode_picture_header(MpegEncContext * s, int picture_number)
s->gob_number = 0;

put_bits(&s->pb, 22, 0x20); /* PSC */
put_bits(&s->pb, 8, (((int64_t)s->picture_number * 30 * FRAME_RATE_BASE) /
s->frame_rate) & 0xff);
put_bits(&s->pb, 8, (((int64_t)s->picture_number * 30 * s->avctx->frame_rate_base) /
s->avctx->frame_rate) & 0xff);

put_bits(&s->pb, 1, 1); /* marker */
put_bits(&s->pb, 1, 0); /* h263 id */
@@ -1587,16 +1587,16 @@ void ff_set_mpeg4_time(MpegEncContext * s, int picture_number){
int time_div, time_mod;

if(s->pict_type==I_TYPE){ //we will encode a vol header
s->time_increment_resolution= s->frame_rate/ff_gcd(s->frame_rate, FRAME_RATE_BASE);
if(s->time_increment_resolution>=256*256) s->time_increment_resolution= 256*128;
int dummy;
av_reduce(&s->time_increment_resolution, &dummy, s->avctx->frame_rate, s->avctx->frame_rate_base, (1<<16)-1);
s->time_increment_bits = av_log2(s->time_increment_resolution - 1) + 1;
}
if(s->current_picture.pts)
s->time= (s->current_picture.pts*s->time_increment_resolution + 500*1000)/(1000*1000);
else
s->time= picture_number*(int64_t)FRAME_RATE_BASE*s->time_increment_resolution/s->frame_rate;
s->time= av_rescale(picture_number*(int64_t)s->avctx->frame_rate_base, s->time_increment_resolution, s->avctx->frame_rate);
time_div= s->time/s->time_increment_resolution;
time_mod= s->time%s->time_increment_resolution;



+ 22
- 15
libavcodec/mpeg12.c View File

@@ -203,8 +203,10 @@ static void mpeg1_encode_sequence_header(MpegEncContext *s)
int i, dmin, d;
s->frame_rate_index = 0;
dmin = 0x7fffffff;
for(i=1;i<9;i++) {
d = abs(s->frame_rate - frame_rate_tab[i]);
for(i=1;i<14;i++) {
if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
d = abs(MPEG1_FRAME_RATE_BASE*(int64_t)s->avctx->frame_rate/s->avctx->frame_rate_base - frame_rate_tab[i]);
if (d < dmin) {
dmin = d;
s->frame_rate_index = i;
@@ -248,22 +250,22 @@ static void mpeg1_encode_sequence_header(MpegEncContext *s)
/* time code : we must convert from the real frame rate to a
fake mpeg frame rate in case of low frame rate */
fps = frame_rate_tab[s->frame_rate_index];
time_code = (int64_t)s->fake_picture_number * FRAME_RATE_BASE;
time_code = (int64_t)s->fake_picture_number * MPEG1_FRAME_RATE_BASE;
s->gop_picture_number = s->fake_picture_number;
put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
put_bits(&s->pb, 1, 1);
put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / FRAME_RATE_BASE));
put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / MPEG1_FRAME_RATE_BASE));
put_bits(&s->pb, 1, 1); /* closed gop */
put_bits(&s->pb, 1, 0); /* broken link */
}

if (s->frame_rate < (24 * FRAME_RATE_BASE) && s->picture_number > 0) {
if (s->avctx->frame_rate < (24 * s->avctx->frame_rate_base) && s->picture_number > 0) {
/* insert empty P pictures to slow down to the desired
frame rate. Each fake pictures takes about 20 bytes */
fps = frame_rate_tab[s->frame_rate_index];
n = (((int64_t)s->picture_number * fps) / s->frame_rate) - 1;
n = av_rescale((int64_t)s->picture_number * s->avctx->frame_rate_base, fps, s->avctx->frame_rate) / MPEG1_FRAME_RATE_BASE - 1;
while (s->fake_picture_number < n) {
mpeg1_skip_picture(s, s->fake_picture_number -
s->gop_picture_number);
@@ -1638,8 +1640,13 @@ static void mpeg_decode_sequence_extension(MpegEncContext *s)
s->low_delay = get_bits1(&s->gb);
frame_rate_ext_n = get_bits(&s->gb, 2);
frame_rate_ext_d = get_bits(&s->gb, 5);
if (frame_rate_ext_d >= 1)
s->frame_rate = (s->frame_rate * frame_rate_ext_n) / frame_rate_ext_d;
av_reduce(
&s->avctx->frame_rate,
&s->avctx->frame_rate_base,
frame_rate_tab[s->frame_rate_index] * (frame_rate_ext_n+1),
MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d+1),
1<<30);

dprintf("sequence extension\n");
s->mpeg2 = 1;
s->avctx->sub_id = 2; /* indicates mpeg2 found */
@@ -1990,13 +1997,13 @@ static int mpeg1_decode_sequence(AVCodecContext *avctx,
s->avctx = avctx;
avctx->width = width;
avctx->height = height;
if (s->frame_rate_index >= 9) {
/* at least give a valid frame rate (some old mpeg1 have this) */
avctx->frame_rate = 25 * FRAME_RATE_BASE;
} else {
avctx->frame_rate = frame_rate_tab[s->frame_rate_index];
}
s->frame_rate = avctx->frame_rate;
av_reduce(
&avctx->frame_rate,
&avctx->frame_rate_base,
frame_rate_tab[s->frame_rate_index],
MPEG1_FRAME_RATE_BASE, //FIXME store in allready reduced form
1<<30
);
avctx->bit_rate = s->bit_rate;
if (MPV_common_init(s) < 0)


+ 22
- 10
libavcodec/mpeg12data.h View File

@@ -385,16 +385,28 @@ static const uint8_t mbMotionVectorTable[17][2] = {
{ 0xc, 10 },
};

static const int frame_rate_tab[9] = {
0,
24000 * FRAME_RATE_BASE / 1001,
24000 * FRAME_RATE_BASE / 1000,
25000 * FRAME_RATE_BASE / 1000,
30000 * FRAME_RATE_BASE / 1001,
30000 * FRAME_RATE_BASE / 1000,
50000 * FRAME_RATE_BASE / 1000,
60000 * FRAME_RATE_BASE / 1001,
60000 * FRAME_RATE_BASE / 1000,
#define MPEG1_FRAME_RATE_BASE 1001

static const int frame_rate_tab[16] = {
0,
24000,
24024,
25025,
30000,
30030,
50050,
60000,
60060,
// Xing's 15fps: (9)
15015,
// libmpeg3's "Unofficial economy rates": (10-13)
5005,
10010,
12012,
15015,
// random, just to avoid segfault !never encode these
25025,
25025,
};

static const uint8_t non_linear_qscale[32] = {


+ 2
- 2
libavcodec/mpegvideo.c View File

@@ -504,7 +504,6 @@ int MPV_encode_init(AVCodecContext *avctx)

s->bit_rate = avctx->bit_rate;
s->bit_rate_tolerance = avctx->bit_rate_tolerance;
s->frame_rate = avctx->frame_rate;
s->width = avctx->width;
s->height = avctx->height;
if(avctx->gop_size > 600){
@@ -557,7 +556,8 @@ int MPV_encode_init(AVCodecContext *avctx)
switch(avctx->codec->id) {
case CODEC_ID_MPEG1VIDEO:
s->out_format = FMT_MPEG1;
avctx->delay=0; //FIXME not sure, should check the spec
s->low_delay= 0; //s->max_b_frames ? 0 : 1;
avctx->delay= s->low_delay ? 0 : (s->max_b_frames + 1);
break;
case CODEC_ID_MJPEG:
s->out_format = FMT_MJPEG;


+ 0
- 1
libavcodec/mpegvideo.h View File

@@ -192,7 +192,6 @@ typedef struct MpegEncContext {
/* the following parameters must be initialized before encoding */
int width, height;///< picture size. must be a multiple of 16
int gop_size;
int frame_rate; ///< number of frames per second
int intra_only; ///< if true, only intra pictures are generated
int bit_rate; ///< wanted bit rate
int bit_rate_tolerance; ///< amount of +- bits (>0)


+ 1
- 1
libavcodec/msmpeg4.c View File

@@ -435,7 +435,7 @@ void msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number)

void msmpeg4_encode_ext_header(MpegEncContext * s)
{
put_bits(&s->pb, 5, s->frame_rate / FRAME_RATE_BASE); //yes 29.97 -> 29
put_bits(&s->pb, 5, s->avctx->frame_rate / s->avctx->frame_rate_base); //yes 29.97 -> 29

put_bits(&s->pb, 11, FFMIN(s->bit_rate/1024, 2047));



+ 4
- 4
libavcodec/ratecontrol.c View File

@@ -164,7 +164,7 @@ int ff_rate_control_init(MpegEncContext *s)
bits= rce.i_tex_bits + rce.p_tex_bits;

q= get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum, i);
rcc->pass1_wanted_bits+= s->bit_rate/(s->frame_rate / (double)FRAME_RATE_BASE);
rcc->pass1_wanted_bits+= s->bit_rate/(s->avctx->frame_rate / (double)s->avctx->frame_rate_base);
}
}

@@ -197,7 +197,7 @@ static inline double bits2qp(RateControlEntry *rce, double bits){
static void update_rc_buffer(MpegEncContext *s, int frame_size){
RateControlContext *rcc= &s->rc_context;
const double fps= (double)s->frame_rate / FRAME_RATE_BASE;
const double fps= (double)s->avctx->frame_rate / (double)s->avctx->frame_rate_base;
const double buffer_size= s->avctx->rc_buffer_size;
const double min_rate= s->avctx->rc_min_rate/fps;
const double max_rate= s->avctx->rc_max_rate/fps;
@@ -571,7 +571,7 @@ float ff_rate_estimate_qscale(MpegEncContext *s)

get_qminmax(&qmin, &qmax, s, pict_type);

fps= (double)s->frame_rate / FRAME_RATE_BASE;
fps= (double)s->avctx->frame_rate / (double)s->avctx->frame_rate_base;
//printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate);
/* update predictors */
if(picture_number>2){
@@ -698,7 +698,7 @@ static int init_pass2(MpegEncContext *s)
{
RateControlContext *rcc= &s->rc_context;
int i;
double fps= (double)s->frame_rate / FRAME_RATE_BASE;
double fps= (double)s->avctx->frame_rate / (double)s->avctx->frame_rate_base;
double complexity[5]={0,0,0,0,0}; // aproximate bits at quant=1
double avg_quantizer[5];
uint64_t const_bits[5]={0,0,0,0,0}; // quantizer idependant bits


+ 62
- 2
libavcodec/utils.c View File

@@ -236,7 +236,8 @@ void avcodec_get_context_defaults(AVCodecContext *s){
s->error_concealment= 3;
s->error_resilience= 1;
s->workaround_bugs= FF_BUG_AUTODETECT;
s->frame_rate = 25 * FRAME_RATE_BASE;
s->frame_rate_base= 1;
s->frame_rate = 25;
s->gop_size= 50;
s->me_method= ME_EPZS;
s->get_buffer= avcodec_default_get_buffer;
@@ -463,7 +464,7 @@ void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", %dx%d, %0.2f fps",
enc->width, enc->height,
(float)enc->frame_rate / FRAME_RATE_BASE);
(float)enc->frame_rate / enc->frame_rate_base);
}
if (encode) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
@@ -588,6 +589,65 @@ void avcodec_flush_buffers(AVCodecContext *avctx)
}
}

int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
int exact=1, sign=0;
int64_t gcd, larger;

assert(den != 0);

if(den < 0){
den= -den;
nom= -nom;
}
if(nom < 0){
nom= -nom;
sign= 1;
}
for(;;){ //note is executed 1 or 2 times
gcd = ff_gcd(nom, den);
nom /= gcd;
den /= gcd;
larger= FFMAX(nom, den);
if(larger > max){
int64_t div= (larger + max - 1) / max;
nom = (nom + div/2)/div;
den = (den + div/2)/div;
exact=0;
}else
break;
}
if(sign) nom= -nom;
*dst_nom = nom;
*dst_den = den;
return exact;
}

int64_t av_rescale(int64_t a, int b, int c){
uint64_t h, l;
assert(c > 0);
assert(b >=0);
if(a<0) return -av_rescale(-a, b, c);
h= a>>32;
if(h==0) return a*b/c;
l= a&0xFFFFFFFF;
l *= b;
h *= b;

l += (h%c)<<32;

return ((h/c)<<32) + l/c;
}

static int raw_encode_init(AVCodecContext *s)
{
return 0;


+ 1
- 1
libavcodec/wmv2.c View File

@@ -66,7 +66,7 @@ static int encode_ext_header(Wmv2Context *w){
init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size, NULL, NULL);

put_bits(&pb, 5, s->frame_rate / FRAME_RATE_BASE); //yes 29.97 -> 29
put_bits(&pb, 5, s->avctx->frame_rate / s->avctx->frame_rate_base); //yes 29.97 -> 29
put_bits(&pb, 11, FFMIN(s->bit_rate/1024, 2047));
put_bits(&pb, 1, w->mspel_bit=1);


+ 1
- 2
libavformat/asf.c View File

@@ -621,8 +621,7 @@ static int asf_write_packet(AVFormatContext *s, int stream_index,
duration = (codec->frame_number * codec->frame_size * int64_t_C(10000000)) /
codec->sample_rate;
} else {
duration = codec->frame_number *
((int64_t_C(10000000) * FRAME_RATE_BASE) / codec->frame_rate);
duration = av_rescale(codec->frame_number * codec->frame_rate_base, 10000000, codec->frame_rate);
}
if (duration > asf->duration)
asf->duration = duration;


+ 2
- 2
libavformat/avformat.h View File

@@ -77,6 +77,7 @@ typedef struct AVProbeData {

typedef struct AVFormatParameters {
int frame_rate;
int frame_rate_base;
int sample_rate;
int channels;
int width;
@@ -159,6 +160,7 @@ typedef struct AVStream {
int id; /* format specific stream id */
AVCodecContext codec; /* codec context */
int r_frame_rate; /* real frame rate of the stream */
int r_frame_rate_base;/* real frame rate base of the stream */
uint64_t time_length; /* real length of the stream in miliseconds */
void *priv_data;
/* internal data used in av_find_stream_info() */
@@ -332,8 +334,6 @@ extern AVOutputFormat yuv4mpegpipe_oformat;
#define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
#define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))

int av_gcd(int a, int b);

void av_register_input_format(AVInputFormat *format);
void av_register_output_format(AVOutputFormat *format);
AVOutputFormat *guess_stream_format(const char *short_name,


+ 10
- 6
libavformat/avidec.c View File

@@ -133,12 +133,16 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
scale= get_le32(pb); /* scale */
rate= get_le32(pb); /* rate */

if(scale && rate)
st->codec.frame_rate= (rate * (uint64_t)FRAME_RATE_BASE + scale/2) / scale;
else if(frame_period)
st->codec.frame_rate = (1000000LL * FRAME_RATE_BASE + frame_period/2) / frame_period;
else
st->codec.frame_rate = 25 * FRAME_RATE_BASE;
if(scale && rate){
st->codec.frame_rate = rate;
st->codec.frame_rate_base= scale;
}else if(frame_period){
st->codec.frame_rate = 1000000;
st->codec.frame_rate_base= frame_period;
}else{
st->codec.frame_rate = 25;
st->codec.frame_rate_base = 1;
}
url_fskip(pb, size - 7 * 4);
break;


+ 3
- 7
libavformat/avienc.c View File

@@ -218,7 +218,7 @@ static int avi_write_header(AVFormatContext *s)
nb_frames = 0;

if(video_enc){
put_le32(pb, (uint32_t)(int64_t_C(1000000) * FRAME_RATE_BASE / video_enc->frame_rate));
put_le32(pb, (uint32_t)(int64_t_C(1000000) * video_enc->frame_rate_base / video_enc->frame_rate));
} else {
put_le32(pb, 0);
}
@@ -244,8 +244,6 @@ static int avi_write_header(AVFormatContext *s)
/* stream list */
for(i=0;i<n;i++) {
int gcd;
list2 = start_tag(pb, "LIST");
put_tag(pb, "strl");
@@ -262,10 +260,8 @@ static int avi_write_header(AVFormatContext *s)
put_le16(pb, 0); /* language */
put_le32(pb, 0); /* initial frame */
gcd= av_gcd(stream->frame_rate, FRAME_RATE_BASE);
put_le32(pb, FRAME_RATE_BASE / gcd); /* scale */
put_le32(pb, stream->frame_rate / gcd); /* rate */
put_le32(pb, stream->frame_rate_base); /* scale */
put_le32(pb, stream->frame_rate); /* rate */

put_le32(pb, 0); /* start */
avi->frames_hdr_strm[i] = url_ftell(pb); /* remember this offset to fill later */


+ 2
- 1
libavformat/dv1394.c View File

@@ -138,7 +138,8 @@ static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap
vst->codec.codec_id = CODEC_ID_DVVIDEO;
vst->codec.width = dv->width;
vst->codec.height = dv->height;
vst->codec.frame_rate = dv->frame_rate * FRAME_RATE_BASE;
vst->codec.frame_rate = dv->frame_rate;
vst->codec.frame_rate_base = 1;
vst->codec.bit_rate = 25000000; /* Consumer DV is 25Mbps */

ast->codec.codec_type = CODEC_TYPE_AUDIO;


+ 5
- 10
libavformat/ffm.c View File

@@ -140,8 +140,6 @@ static int ffm_write_header(AVFormatContext *s)

/* list of streams */
for(i=0;i<s->nb_streams;i++) {
int gcd;
st = s->streams[i];
fst = av_mallocz(sizeof(FFMStream));
if (!fst)
@@ -158,9 +156,8 @@ static int ffm_write_header(AVFormatContext *s)
/* specific info */
switch(codec->codec_type) {
case CODEC_TYPE_VIDEO:
gcd= av_gcd(FRAME_RATE_BASE, codec->frame_rate);
put_be32(pb, FRAME_RATE_BASE / gcd);
put_be32(pb, codec->frame_rate / gcd);
put_be32(pb, codec->frame_rate_base);
put_be32(pb, codec->frame_rate);
put_be16(pb, codec->width);
put_be16(pb, codec->height);
put_be16(pb, codec->gop_size);
@@ -229,7 +226,7 @@ static int ffm_write_packet(AVFormatContext *s, int stream_index,
if (st->codec.codec_type == CODEC_TYPE_AUDIO) {
duration = ((float)st->codec.frame_size / st->codec.sample_rate * 1000000.0);
} else {
duration = (1000000.0 * FRAME_RATE_BASE / (float)st->codec.frame_rate);
duration = (1000000.0 * st->codec.frame_rate_base / (float)st->codec.frame_rate);
}

pts = fst->pts;
@@ -394,7 +391,6 @@ static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
/* read each stream */
for(i=0;i<s->nb_streams;i++) {
char rc_eq_buf[128];
int rate, scale;

st = av_mallocz(sizeof(AVStream));
if (!st)
@@ -416,9 +412,8 @@ static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
/* specific info */
switch(codec->codec_type) {
case CODEC_TYPE_VIDEO:
scale= get_be32(pb);
rate= get_be32(pb);
codec->frame_rate = (rate * (int64_t)FRAME_RATE_BASE) / scale;
codec->frame_rate_base = get_be32(pb);
codec->frame_rate = get_be32(pb);
codec->width = get_be16(pb);
codec->height = get_be16(pb);
codec->gop_size = get_be16(pb);


+ 3
- 3
libavformat/gif.c View File

@@ -296,7 +296,7 @@ static int gif_write_header(AVFormatContext *s)
GIFContext *gif = s->priv_data;
ByteIOContext *pb = &s->pb;
AVCodecContext *enc, *video_enc;
int i, width, height, rate;
int i, width, height/*, rate*/;

/* XXX: do we reject audio streams or just ignore them ?
if(s->nb_streams > 1)
@@ -318,7 +318,7 @@ static int gif_write_header(AVFormatContext *s)
} else {
width = video_enc->width;
height = video_enc->height;
rate = video_enc->frame_rate;
// rate = video_enc->frame_rate;
}

/* XXX: is it allowed ? seems to work so far... */
@@ -351,7 +351,7 @@ static int gif_write_video(AVFormatContext *s,
/* XXX: should use delay, in order to be more accurate */
/* instead of using the same rounded value each time */
/* XXX: don't even remember if I really use it for now */
jiffies = (70*FRAME_RATE_BASE/enc->frame_rate) - 1;
jiffies = (70*enc->frame_rate_base/enc->frame_rate) - 1;

put_le16(pb, jiffies);



+ 2
- 1
libavformat/gifdec.c View File

@@ -535,7 +535,8 @@ static int gif_read_header(AVFormatContext * s1,

st->codec.codec_type = CODEC_TYPE_VIDEO;
st->codec.codec_id = CODEC_ID_RAWVIDEO;
st->codec.frame_rate = 5 * FRAME_RATE_BASE;
st->codec.frame_rate = 5;
st->codec.frame_rate_base = 1;
/* XXX: check if screen size is always valid */
st->codec.width = s->screen_width;
st->codec.height = s->screen_height;


+ 9
- 5
libavformat/grab.c View File

@@ -31,6 +31,7 @@ typedef struct {
int use_mmap;
int width, height;
int frame_rate;
int frame_rate_base;
int64_t time_frame;
int frame_size;
struct video_capability video_cap;
@@ -59,7 +60,7 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
AVStream *st;
int width, height;
int video_fd, frame_size;
int ret, frame_rate;
int ret, frame_rate, frame_rate_base;
int desired_palette;
struct video_audio audio;
const char *video_device;
@@ -69,7 +70,8 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
width = ap->width;
height = ap->height;
frame_rate = ap->frame_rate;
frame_rate = ap->frame_rate;
frame_rate_base = ap->frame_rate_base;

st = av_new_stream(s1, 0);
if (!st)
@@ -77,7 +79,8 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)

s->width = width;
s->height = height;
s->frame_rate = frame_rate;
s->frame_rate = frame_rate;
s->frame_rate_base = frame_rate_base;

video_device = ap->device;
if (!video_device)
@@ -240,7 +243,8 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
st->codec.codec_id = CODEC_ID_RAWVIDEO;
st->codec.width = width;
st->codec.height = height;
st->codec.frame_rate = frame_rate;
st->codec.frame_rate = frame_rate;
st->codec.frame_rate_base = frame_rate_base;
av_set_pts_info(s1, 48, 1, 1000000); /* 48 bits pts in us */

@@ -283,7 +287,7 @@ static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
VideoData *s = s1->priv_data;
int64_t curtime, delay;
struct timespec ts;
int64_t per_frame = (int64_t_C(1000000) * FRAME_RATE_BASE) / s->frame_rate;
int64_t per_frame = (int64_t_C(1000000) * s->frame_rate_base) / s->frame_rate;

/* Calculate the time of the next frame */
s->time_frame += per_frame;


+ 8
- 5
libavformat/img.c View File

@@ -124,10 +124,13 @@ static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
st->codec.pix_fmt = s->pix_fmt;
s->img_size = avpicture_get_size(s->pix_fmt, s->width, s->height);

if (!ap || !ap->frame_rate)
st->codec.frame_rate = 25 * FRAME_RATE_BASE;
else
st->codec.frame_rate = ap->frame_rate;
if (!ap || !ap->frame_rate){
st->codec.frame_rate = 25;
st->codec.frame_rate_base = 1;
}else{
st->codec.frame_rate = ap->frame_rate;
st->codec.frame_rate_base = ap->frame_rate_base;
}
return 0;
fail1:
@@ -182,7 +185,7 @@ static int img_read_packet(AVFormatContext *s1, AVPacket *pkt)
av_free_packet(pkt);
return -EIO; /* signal EOF */
} else {
pkt->pts = ((int64_t)s->img_number * s1->pts_den * FRAME_RATE_BASE) / (s1->streams[0]->codec.frame_rate * s1->pts_num);
pkt->pts = av_rescale((int64_t)s->img_number * s1->streams[0]->codec.frame_rate_base, s1->pts_den, s1->streams[0]->codec.frame_rate) / s1->pts_num;
s->img_number++;
return 0;
}


+ 4
- 4
libavformat/mov.c View File

@@ -686,7 +686,8 @@ static int parse_stsd(const MOVParseTableEntry *parse_table, ByteIOContext *pb,
get_be16(pb); /* depth */
get_be16(pb); /* colortable id */
st->codec.frame_rate = 25 * FRAME_RATE_BASE;
st->codec.frame_rate = 25;
st->codec.frame_rate_base = 1;
size -= (16+8*4+2+32+2*2);
while (size >= 8) {
@@ -932,9 +933,8 @@ printf("track[%i].stts.entries = %i\n", c->fc->nb_streams-1, entries);
sample_duration = get_be32(pb);

if (!i && st->codec.codec_type==CODEC_TYPE_VIDEO) {
st->codec.frame_rate = FRAME_RATE_BASE * c->streams[c->total_streams]->time_scale;
if (sample_duration)
st->codec.frame_rate /= sample_duration;
st->codec.frame_rate_base = sample_duration ? sample_duration : 1;
st->codec.frame_rate = c->streams[c->total_streams]->time_scale;
#ifdef DEBUG
printf("VIDEO FRAME RATE= %i (sd= %i)\n", st->codec.frame_rate, sample_duration);
#endif


+ 6
- 3
libavformat/raw.c View File

@@ -61,7 +61,8 @@ static int raw_read_header(AVFormatContext *s, AVFormatParameters *ap)
st->codec.channels = ap->channels;
break;
case CODEC_TYPE_VIDEO:
st->codec.frame_rate = ap->frame_rate;
st->codec.frame_rate = ap->frame_rate;
st->codec.frame_rate_base = ap->frame_rate_base;
st->codec.width = ap->width;
st->codec.height = ap->height;
break;
@@ -151,9 +152,11 @@ static int video_read_header(AVFormatContext *s,
/* for mpeg4 specify it too (most mpeg4 streams dont have the fixed_vop_rate set ...)*/
if (st->codec.codec_id == CODEC_ID_MJPEG || st->codec.codec_id == CODEC_ID_MPEG4) {
if (ap) {
st->codec.frame_rate = ap->frame_rate;
st->codec.frame_rate = ap->frame_rate;
st->codec.frame_rate_base = ap->frame_rate_base;
} else {
st->codec.frame_rate = 25 * FRAME_RATE_BASE;
st->codec.frame_rate = 25;
st->codec.frame_rate_base = 1;
}
}
return 0;


+ 3
- 2
libavformat/rm.c View File

@@ -306,7 +306,7 @@ static int rm_write_header(AVFormatContext *s)
break;
case CODEC_TYPE_VIDEO:
rm->video_stream = stream;
stream->frame_rate = (float)codec->frame_rate / (float)FRAME_RATE_BASE;
stream->frame_rate = (float)codec->frame_rate / (float)codec->frame_rate_base;
/* XXX: dummy values */
stream->packet_max_size = 4096;
stream->nb_packets = 0;
@@ -582,7 +582,8 @@ static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
goto fail1;
st->codec.width = get_be16(pb);
st->codec.height = get_be16(pb);
st->codec.frame_rate = get_be16(pb) * FRAME_RATE_BASE;
st->codec.frame_rate_base= 1;
st->codec.frame_rate = get_be16(pb) * st->codec.frame_rate_base;
st->codec.codec_type = CODEC_TYPE_VIDEO;
get_be32(pb);
get_be16(pb);


+ 2
- 4
libavformat/rtp.c View File

@@ -560,9 +560,8 @@ static void rtp_send_mpegvideo(AVFormatContext *s1,
q += len;

/* 90 KHz time stamp */
/* XXX: overflow */
s->timestamp = s->base_timestamp +
(s->cur_timestamp * 90000LL * FRAME_RATE_BASE) / st->codec.frame_rate;
av_rescale((int64_t)s->cur_timestamp * st->codec.frame_rate_base, 90000, st->codec.frame_rate);
rtp_send_data(s1, s->buf, q - s->buf);

buf1 += len;
@@ -586,9 +585,8 @@ static void rtp_send_raw(AVFormatContext *s1,
len = size;

/* 90 KHz time stamp */
/* XXX: overflow */
s->timestamp = s->base_timestamp +
(s->cur_timestamp * 90000LL * FRAME_RATE_BASE) / st->codec.frame_rate;
av_rescale((int64_t)s->cur_timestamp * st->codec.frame_rate_base, 90000, st->codec.frame_rate);
rtp_send_data(s1, buf1, len);

buf1 += len;


+ 7
- 5
libavformat/swf.c View File

@@ -194,7 +194,7 @@ static int swf_write_header(AVFormatContext *s)
AVCodecContext *enc, *audio_enc, *video_enc;
PutBitContext p;
uint8_t buf1[256];
int i, width, height, rate;
int i, width, height, rate, rate_base;

swf = av_malloc(sizeof(SWFContext));
if (!swf)
@@ -215,11 +215,13 @@ static int swf_write_header(AVFormatContext *s)
/* currenty, cannot work correctly if audio only */
width = 320;
height = 200;
rate = 10 * FRAME_RATE_BASE;
rate = 10;
rate_base= 1;
} else {
width = video_enc->width;
height = video_enc->height;
rate = video_enc->frame_rate;
rate_base = video_enc->frame_rate_base;
}

put_tag(pb, "FWS");
@@ -228,9 +230,9 @@ static int swf_write_header(AVFormatContext *s)
(will be patched if not streamed) */

put_swf_rect(pb, 0, width, 0, height);
put_le16(pb, (rate * 256) / FRAME_RATE_BASE); /* frame rate */
put_le16(pb, (rate * 256) / rate_base); /* frame rate */
swf->duration_pos = url_ftell(pb);
put_le16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / FRAME_RATE_BASE)); /* frame count */
put_le16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
/* define a shape with the jpeg inside */

@@ -305,7 +307,7 @@ static int swf_write_header(AVFormatContext *s)
put_swf_tag(s, TAG_STREAMHEAD);
put_byte(&s->pb, 0);
put_byte(&s->pb, v);
put_le16(&s->pb, (audio_enc->sample_rate * FRAME_RATE_BASE) / rate); /* avg samples per frame */
put_le16(&s->pb, (audio_enc->sample_rate * rate_base) / rate); /* avg samples per frame */
put_swf_end_tag(s);


+ 11
- 12
libavformat/utils.c View File

@@ -614,10 +614,12 @@ int av_find_stream_info(AVFormatContext *ic)
#endif
/* stop after 40 frames */
if (st->codec_info_nb_real_frames >= 40) {
st->r_frame_rate = (st->codec.frame_rate *
st->codec_info_nb_real_frames) /
(st->codec_info_nb_real_frames +
(st->codec_info_nb_repeat_frames >> 1));
av_reduce(
&st->r_frame_rate,
&st->r_frame_rate_base,
(int64_t)st->codec.frame_rate * st->codec_info_nb_real_frames,
st->codec_info_nb_real_frames + (st->codec_info_nb_repeat_frames >> 1),
1<<30);
goto close_codec;
}
} else {
@@ -645,8 +647,10 @@ int av_find_stream_info(AVFormatContext *ic)
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
if (!st->r_frame_rate)
st->r_frame_rate = st->codec.frame_rate;
if (!st->r_frame_rate){
st->r_frame_rate = st->codec.frame_rate;
st->r_frame_rate_base = st->codec.frame_rate_base;
}
}
}

@@ -820,7 +824,7 @@ int av_write_frame(AVFormatContext *s, int stream_index, const uint8_t *buf,
break;
case CODEC_TYPE_VIDEO:
av_frac_add(&st->pts,
(int64_t)s->pts_den * FRAME_RATE_BASE);
(int64_t)s->pts_den * st->codec.frame_rate_base);
break;
default:
break;
@@ -1316,11 +1320,6 @@ void av_frac_add(AVFrac *f, int64_t incr)
f->num = num;
}

int av_gcd(int a, int b){
if(b) return av_gcd(b, a%b);
else return a;
}

/**
* register a new image format
* @param img_fmt Image format descriptor


+ 14
- 6
libavformat/yuv4mpeg.c View File

@@ -26,7 +26,7 @@ static int yuv4_write_header(AVFormatContext *s)
{
AVStream *st;
int width, height;
int raten, rated, aspectn, aspectd, fps, fps1, n;
int raten, rated, aspectn, aspectd, fps, fps1, n, gcd;
char buf[Y4M_LINE_MAX+1];

if (s->nb_streams != 1)
@@ -35,9 +35,13 @@ static int yuv4_write_header(AVFormatContext *s)
st = s->streams[0];
width = st->codec.width;
height = st->codec.height;

#if 1
//this is identical to the code below for exact fps
av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1);
#else
fps = st->codec.frame_rate;
fps1 = (((float)fps / FRAME_RATE_BASE) * 1000);
fps1 = (((float)fps / st->codec.frame_rate_base) * 1000);
/* Sorry about this messy code, but mpeg2enc is very picky about
* the framerates it accepts. */
@@ -75,13 +79,17 @@ static int yuv4_write_header(AVFormatContext *s)
rated = 1;
break;
default:
raten = fps1; /* this setting should work, but often doesn't */
rated = 1000;
raten = st->codec.frame_rate; /* this setting should work, but often doesn't */
rated = st->codec.frame_rate_base;
gcd= av_gcd(raten, rated);
raten /= gcd;
rated /= gcd;
break;
}
#endif
aspectn = 1;
aspectd = 1; /* ffmpeg always uses a 1:1 aspect ratio */
aspectd = 1; /* ffmpeg always uses a 1:1 aspect ratio */ //FIXME not true anymore

/* construct stream header, if this is the first frame */
n = snprintf(buf, sizeof(buf), "%s W%d H%d F%d:%d I%s A%d:%d\n",


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