[Ffmpeg-devel] [PATCH] a fix in ffmpeg.c

[Limin Wang]

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Hi developer,

When I decode a h264 file by using ffmpeg, it can't decode all frame as my
expect(300frame in total, it decode 180 frame only).

lmwang at laptop:~/yuvad/open/h264/ffmpeg$ ./ffmpeg -f h264 -i
/tmp/akiyo_cif.h264 /tmp/akiyo_cif.yuv
FFmpeg version SVN-r7430, Copyright (c) 2000-2006 Fabrice Bellard, et al.
  configuration:  --enable-gpl --enable-x264
  libavutil version: 49.1.0
  libavcodec version: 51.28.0
  libavformat version: 51.7.0
  built on Jan 18 2007 15:28:56, gcc: 4.1.2 20061115 (prerelease) (Debian
  4.1.1-21)
Input #0, h264, from '/tmp/akiyo_cif.h264':
  Duration: N/A, bitrate: N/A
  Stream #0.0: Video: h264, yuv420p, 352x288, 15.00 fps(r)
File '/tmp/akiyo_cif.yuv' already exists. Overwrite ? [y/N] y
Output #0, rawvideo, to '/tmp/akiyo_cif.yuv':
  Stream #0.0: Video: rawvideo, yuv420p, 352x288, q=2-31, 200 kb/s, 15.00
  fps(c)
Stream mapping:
  Stream #0.0 -> #0.0
Press [q] to stop encoding
frame=  180 q=0.0 Lsize=   26730kB time=12.0 bitrate=18247.7kbits/s
video:26730kB audio:0kB global headers:0kB muxing overhead 0.000000%
lmwang at laptop:~/yuvad/open/h264/ffmpeg$   


After investigated , I found out it's caused by pts is set by default
fps(25). Below is my fix, please review it.

Thanks,
Limin


Index: ffmpeg.c
===================================================================
- --- ffmpeg.c	(revision 7430)
+++ ffmpeg.c	(working copy)
@@ -2667,6 +2667,9 @@
             frame_rate      = rfps;
             frame_rate_base = rfps_base;
 
+            /* need update stream pts info also */
+            av_set_pts_info(ic->streams[i], 64, frame_rate_base, frame_rate );
+
             enc->rate_emu = rate_emu;
             if(video_disable)
                 ic->streams[i]->discard= AVDISCARD_ALL;
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