id summary reporter owner description type status priority component version resolution keywords cc blockedby blocking reproduced analyzed 1435 Remuxing aac from mov to avi breaks timestamps feelart " FFmpeg 0.11.1 (32bits static) under WinXP Hi, This bug seems similar to other bug tracking on synchronisation issues. Bug affects any input video, with same codecs & container. Input video directly from camera, see below. Descrynize output with (note wrong duration is displayed for the output video) ffmpeg -i ""2012-03 03Praha.mp4"" -async 1 -acodec copy -vcodec mpeg4 -q 20 out_mpeg4AVI.avi Synchronize output with: ffmpeg -i ""2012-03 03Praha.mp4"" -async 1 -f mp4 -acodec copy -vcodec mpeg4 -q 20 out_mpeg4AVIMP4.avi Now interestingly, 1/ if one takes the 1st instruction line, but changes to mkv or mp4, no problem, example ffmpeg -i ""2012-03 03Praha.mp4"" -async 1 -acodec copy -vcodec mpeg4 -q 20 out_mpeg4_mp4.mp4 2/ if one takes the 1st instruction line, but converts the audio, no probem ffmpeg -i ""2012-03 03Praha.mp4"" -async 1 -acodec libmp3lame -vcodec mpeg4 -q 20 out_mpeg4AVI_mp3.avi 3/ Now, no problem with ffmpeg -i out_mpeg4.mp4 -vcodec copy -acodec copy -f mp4 output.avi 4/ KO with ffmpeg -i out_mpeg4.mkv -vcodec copy -acodec copy -f mkv output.avi Input video available on request. Details: {{{ C:\Documents and Settings\Angel\Mes documents\Downloads>ffmpeg -v 9 -loglevel 99 -i ""2012-03 03Praha.mp4"" -async 1 -acodec copy -vcodec mpeg4 -q 20 out_mpeg4AVI.avi ffmpeg version N-41416-g718607b Copyright (c) 2000-2012 the FFmpeg developers built on Jun 8 2012 12:46:19 with gcc 4.6.3 configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --ena libavutil 51. 56.100 / 51. 56.100 libavcodec 54. 25.100 / 54. 25.100 libavformat 54. 6.101 / 54. 6.101 libavdevice 54. 0.100 / 54. 0.100 libavfilter 2. 78.101 / 2. 78.101 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 15.100 / 0. 15.100 libpostproc 52. 0.100 / 52. 0.100 [mov,mp4,m4a,3gp,3g2,mj2 @ 022dd220] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100 [mov,mp4,m4a,3gp,3g2,mj2 @ 022dd220] ISO: File Type Major Brand: MSNV [mov,mp4,m4a,3gp,3g2,mj2 @ 022dd220] File position before avformat_find_stream_info() is 54769662 [mov,mp4,m4a,3gp,3g2,mj2 @ 022dd220] All info found [mov,mp4,m4a,3gp,3g2,mj2 @ 022dd220] File position after avformat_find_stream_info() is 545749 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2012-03 03Praha.mp4': Metadata: major_brand : MSNV minor_version : 19595353 compatible_brands: MSNVmp42isom creation_time : 2012-03-29 21:13:18 Duration: 00:00:49.04, start: 0.000000, bitrate: 8933 kb/s Stream #0:0(und), 15, 1/30000: Video: mpeg4 (Advanced Coding Profile) (mp4v / 0x7634706D), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1/30000, 8866 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc Metadata: creation_time : 2012-03-29 21:13:18 handler_name : Video Media Handler Stream #0:1(und), 1, 1/24000: Audio: aac (mp4a / 0x6134706D), 24000 Hz, mono, s16, 64 kb/s Metadata: creation_time : 2012-03-29 21:13:18 handler_name : Sound Media Handler [buffer @ 022ddd40] w:1280 h:720 pixfmt:yuv420p tb:1/30000 sar:1/1 sws_param:flags=2 [ffmpeg_buffersink @ 022dda40] No opaque field provided [mpeg4 @ 022d9a40] detected 1 logical cores [mpeg4 @ 022d9a40] intra_quant_bias = 0 inter_quant_bias = -64 [mpeg4 @ 022d23c0] detected 1 logical cores Output #0, avi, to 'out_mpeg4AVI.avi': Metadata: major_brand : MSNV minor_version : 19595353 compatible_brands: MSNVmp42isom creation_time : 2012-03-29 21:13:18 ISFT : Lavf54.6.101 Stream #0:0(und), 0, 1001/30000: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1001/30000, q=2-31, 200 kb/s, 29.97 tbn, 29.97 tbc Metadata: creation_time : 2012-03-29 21:13:18 handler_name : Video Media Handler Stream #0:1(und), 0, 16/375: Audio: aac ([255][0][0][0] / 0x00FF), 24000 Hz, mono, 64 kb/s Metadata: creation_time : 2012-03-29 21:13:18 handler_name : Sound Media Handler Stream mapping: Stream #0:0 -> #0:0 (mpeg4 -> mpeg4) Stream #0:1 -> #0:1 (copy) Press [q] to stop, [?] for help frame= 1470 fps= 32 q=20.0 Lsize= 5169kB time=00:00:49.02 bitrate= 863.7kbits/s video:4713kB audio:383kB global headers:0kB muxing overhead 1.421177% C:\Documents and Settings\Angel\Mes documents\Downloads> }}}" defect closed normal undetermined git-master fixed avi aac desync 1 0