update swf video frame number when muxing done, fix #439

Originally committed as revision 14293 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/swf.h

@@ -67,7 +67,7 @@ typedef struct {
     int audio_stream_index;
     offset_t duration_pos;
     offset_t tag_pos;
-
+    offset_t vframes_pos;
     int samples_per_frame;
     int sound_samples;
     int swf_frame_number;

libavformat/swfenc.c

@@ -344,6 +344,7 @@ static int swf_write_video(AVFormatContext *s,
             /* create a new video object */
             put_swf_tag(s, TAG_VIDEOSTREAM);
             put_le16(pb, VIDEO_ID);
+            swf->vframes_pos = url_ftell(pb);
             put_le16(pb, 15000); /* hard flash player limit */
             put_le16(pb, enc->width);
             put_le16(pb, enc->height);
@@ -495,6 +496,8 @@ static int swf_write_trailer(AVFormatContext *s)
         put_le32(pb, file_size);
         url_fseek(pb, swf->duration_pos, SEEK_SET);
         put_le16(pb, swf->video_frame_number);
+        url_fseek(pb, swf->vframes_pos, SEEK_SET);
+        put_le16(pb, swf->video_frame_number);
         url_fseek(pb, file_size, SEEK_SET);
     }
     return 0;

tests/libav.regression.ref

@@ -12,7 +12,7 @@ bdb7484c68db722f66ba1630cf79844c *./tests/data/b-libav.mpg
 447b005e527cf495ec13092e788f028d *./tests/data/b-libav.ts
 471692 ./tests/data/b-libav.ts
 ./tests/data/b-libav.ts CRC=0xcc4948e1
-d6fdeb9f7083cc827f9510c6c4517dc0 *./tests/data/b-libav.swf
+1b28a16652bb8ac528b33f7478ca18b6 *./tests/data/b-libav.swf
 335771 ./tests/data/b-libav.swf
 ./tests/data/b-libav.swf CRC=0xe14e8847
 3dbacdc3fccb551f8ab54c32f648e7a8 *./tests/data/b-libav.ffm