movenc: Add option to disable nero chapters

And add flag to muxer documentation.
Nero chapters break some taggers (mp3tag and iTunes).

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

doc/muxers.texi

@@ -330,6 +330,11 @@ This option is implicitly set when writing ismv (Smooth Streaming) files.
 Run a second pass moving the index (moov atom) to the beginning of the file.
 This operation can take a while, and will not work in various situations such
 as fragmented output, thus it is not enabled by default.
+@item -movflags disable_chpl
+Disable Nero chapter markers (chpl atom).  Normally, both Nero chapters
+and a QuickTime chapter track are written to the file. With this option
+set, only the QuickTime chapter track will be written. Nero chapters can
+cause failures when the file is reprocessed with certain tagging programs.
 @end table
 
 Smooth Streaming content can be pushed in real time to a publishing

libavformat/movenc.c

@@ -57,6 +57,7 @@ static const AVOption options[] = {
     { "isml", "Create a live smooth streaming feed (for pushing to a publishing point)", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_ISML}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
     { "faststart", "Run a second pass to put the index (moov atom) at the beginning of the file", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_FASTSTART}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
     { "omit_tfhd_offset", "Omit the base data offset in tfhd atoms", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_OMIT_TFHD_OFFSET}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
+    { "disable_chpl", "Disable Nero chapter atom", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_DISABLE_CHPL}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
     FF_RTP_FLAG_OPTS(MOVMuxContext, rtp_flags),
     { "skip_iods", "Skip writing iods atom.", offsetof(MOVMuxContext, iods_skip), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
     { "iods_audio_profile", "iods audio profile atom.", offsetof(MOVMuxContext, iods_audio_profile), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 255, AV_OPT_FLAG_ENCODING_PARAM},
@@ -2076,7 +2077,7 @@ static int mov_write_udta_tag(AVIOContext *pb, MOVMuxContext *mov,
         mov_write_meta_tag(pb_buf, mov, s);
     }
 
-    if (s->nb_chapters)
+    if (s->nb_chapters && !(mov->flags & FF_MOV_FLAG_DISABLE_CHPL))
         mov_write_chpl_tag(pb_buf, s);
 
     if ((size = avio_close_dyn_buf(pb_buf, &buf)) > 0) {

libavformat/movenc.h

@@ -175,6 +175,7 @@ typedef struct MOVMuxContext {
 #define FF_MOV_FLAG_ISML 64
 #define FF_MOV_FLAG_FASTSTART 128
 #define FF_MOV_FLAG_OMIT_TFHD_OFFSET 256
+#define FF_MOV_FLAG_DISABLE_CHPL 512
 
 int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt);