July 2008 - ffmpeg-user - lists.ffmpeg.org

Avi reader problem
by erik＠arawix.com 01 Jul '08

01 Jul '08

Hello; I have a AVI file generated containing mp3/div3 that, when transcoded to mp2/ac3 mpeg container looses audio/video sync completely. I am not decoding it directly with ffmpeg, but with the libav* libs themselves. Any other avi (once tested until now) work fine. When investigating I see that the pts/dts values for video in the AVPacket, after exactly 20 frames go to AV_NOPTS_VALUE. The first 20 video frames just increase 1 by 1,and at 20 it jumps to AV_NOPTS_VALUE. Does that ring a bell for anyone? I started looking at the avidec, and will do more later today, but perhaps anyone has an idea? Tx for any info Erik

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unable to read .ac3 file
by gmanedotorg＠makuch.org 01 Jul '08

01 Jul '08

I've successfully converted several dozen .mts (AVCHD) files to mpg and swf using ffmpeg and the procedure outlined here http://www.olmosconsulting.com/hdr-sr1/ $ xporthdmv -h mytest.mts 1 1 1 && mv bits0001.mpa mytest.ac3 $ ldecod -i bits0001.mpv -o mytest.yuv $ ffmpeg -y -r 29.97 -s 1440x1080 -i mytest.yuv -i mytest.ac3 -vcodec flv -r 25 -s 480x360 -acodec libmp3lame -ac 2 -ar 22050 -b 1024k -loop_output 0 mytest.swf But now I've encountered an .ac3 file produced by xporthdmv that ffmpeg is unable to read; $ ffmpeg -y -r 29.97 -s 1440x1080 -i mytest.yuv -i mytest.ac3 -vcodec flv -r 25 -s 480x360 -acodec libmp3lame -ac 2 -ar 22050 -b 1024k -loop_output 0 mytest.swf FFmpeg version SVN-r13958, Copyright (c) 2000-2008 Fabrice Bellard, et al. configuration: --enable-libmp3lame --enable-libvorbis --enable-liba52bin --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug libavutil version: 49.7.0 libavcodec version: 51.57.2 libavformat version: 52.16.0 libavdevice version: 52.0.0 built on Jun 25 2008 06:01:47, gcc: 4.1.2 20070925 (Red Hat 4.1.2-27) Input #0, rawvideo, from 'mytest.yuv': Duration: N/A, start: 0.000000, bitrate: N/A Stream #0.0: Video: rawvideo, yuv420p, 1440x1080, 29.97 tb(r) mytest.ac3: Error while opening file The mytest.ac3 plays plays just fine in Media Player Classic. Anyone have any ideas about this? Is the problem ffmpeg or xporthdmv? Here's the mytest.ac3 if anyone is interested; 3.1415926535897.com/mytest.ac3 Thanks

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WMV -vcodec copy -acodec copy = broken on the 'target platform'
by skinkie＠xs4all.nl 01 Jul '08

01 Jul '08

Probably useless bugreport, but lately I toy around again with the -ss options and -fslimit (because the -t option doesn't work for me, bug?). So in the end the result is the same pretty much, when not re-encoded the video is not playable in Windows Media Player. It works fine in ffplay or mplayer, since those tools are the only ones that matter to me I don't really care if it gets fixed... For the sake of completeness: ffmpeg -fs 1400000 -ss 67 -i random.wmv -vcodec cody -acodec copy broken.asf ffmpeg -fs 1400000 -ss 67 -i random.wmv -vcodec wmv2 -acodec wmav2 working.asf Stefan

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