March 2014 - FFmpeg-trac - lists.ffmpeg.org

#3517(avdevice:new): can't set Video4Linux2 framerate
by FFmpeg 08 Nov '14

08 Nov '14

#3517: can't set Video4Linux2 framerate ----------------------------------+-------------------------------------- Reporter: nunojpg | Type: defect Status: new | Priority: normal Component: avdevice | Version: git-master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ----------------------------------+-------------------------------------- ffmpeg version N-61985-gd5c0036 built on Mar 31 2014 22:09:58 with gcc 4.8 (Ubuntu 4.8.2-17ubuntu2) configuration: --enable-libx264 --enable-gpl --enable-libfaac --enable- nonfree Linux sky5 3.13.0-20-generic #42-Ubuntu SMP Fri Mar 28 09:56:33 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux My webcam supports several framerates at 640x480. If I try to grab it using: ./ffmpeg -f v4l2 -video_size 640x480 -framerate 5 -i /dev/video1 out1.avi The webcam will continue with the 30fps selected (checked with v4l2-ctl -all), while ffmpeg will output the correct framerate, by droping every 5 in 6 frames. This is a bug since ffmpeg tries to confirm the v4l2 accepts the selected framerate, but then does not select it: ./ffmpeg -f v4l2 -video_size 640x480 -framerate 3 -i /dev/video1 out3.avi [video4linux2,v4l2 @ 0x32fca40] The driver changed the time per frame from 1/3 to 1/5 In this example v4l2 reports that the webcam does not support 3fps, and the closest value is 5fps. But 30fps will remain selected! Current VLC HEAD does configure v4l2 framerate correctly. Also the framerate is being set before the video_size, which introduces probably related errors. The webcam under test supports hd1080@5fps, and hd720@10fps. According to the following examples, it changes the framerate according to the video_size that was previously selected, and not the one that is currently being selected! ./ffmpeg -f v4l2 -video_size hd720 -framerate 10 -i /dev/video1 out.avi (no errors) ./ffmpeg -f v4l2 -video_size hd1080 -framerate 10 -i /dev/video1 out.avi (no errors) ./ffmpeg -f v4l2 -video_size hd1080 -framerate 10 -i /dev/video1 out.avi [video4linux2,v4l2 @ 0x1f38a40] The driver changed the time per frame from 1/10 to 1/5 ./ffmpeg -f v4l2 -video_size hd720 -framerate 10 -i /dev/video1 out.avi [video4linux2,v4l2 @ 0x1d63a40] The driver changed the time per frame from 1/10 to 1/5 ./ffmpeg -f v4l2 -video_size hd720 -framerate 10 -i /dev/video1 out.avi (no errors) -- Ticket URL: <https://trac.ffmpeg.org/ticket/3517> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#3496(avformat:new): FFmpeg dont detect correct subtitle
by FFmpeg 29 Oct '14

29 Oct '14

#3496: FFmpeg dont detect correct subtitle ----------------------------------+-------------------------------------- Reporter: klpu | Type: defect Status: new | Priority: normal Component: avformat | Version: git-master Keywords: subtitle | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ----------------------------------+-------------------------------------- Summary of the bug: How to reproduce: {{{ % ffmpeg -i *.ass ffmpeg version N-61585-ga1ce776 Copyright (c) 2000-2014 the FFmpeg developers built on Mar 20 2014 11:54:54 with gcc 4.8 (Ubuntu/Linaro 4.8.1-10ubuntu9) configuration: --enable-libfdk-aac --enable-libx264 --enable-openssl --enable-gpl --enable-nonfree --enable-librtmp --enable-x11grab libavutil 52. 67.100 / 52. 67.100 libavcodec 55. 52.102 / 55. 52.102 libavformat 55. 34.101 / 55. 34.101 libavdevice 55. 11.100 / 55. 11.100 libavfilter 4. 3.100 / 4. 3.100 libswscale 2. 5.101 / 2. 5.101 libswresample 0. 18.100 / 0. 18.100 libpostproc 52. 3.100 / 52. 3.100 [mp3 @ 0x2ef99c0] Format mp3 detected only with low score of 1, misdetection possible! [mp3 @ 0x2ef99c0] Estimating duration from bitrate, this may be inaccurate Input #0, mp3, from 'The.Wolf.of.Wall.Street.2013.720p.BluRay.X264-AMIABLE .·±Ìå.ass': Duration: 00:00:26.35, start: 0.000000, bitrate: 160 kb/s Stream #0:0: Audio: mp3, 32000 Hz, stereo, s16p, 160 kb/s At least one output file must be specified }}} Download subtitle frome https://bbs.vitamio.org/files/5326ae02421aa98fcb000752?locale=en&version=or… -- Ticket URL: <https://trac.ffmpeg.org/ticket/3496> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#3454(undetermined:new): Emotion Systems violates GPL
by FFmpeg 24 Oct '14

24 Oct '14

#3454: Emotion Systems violates GPL -------------------------------------+------------------------------------- Reporter: kierank | Type: license Status: new | violation Component: | Priority: normal undetermined | Version: Keywords: | unspecified Blocking: | Blocked By: Analyzed by developer: 0 | Reproduced by developer: 0 -------------------------------------+------------------------------------- Both products on http://emotion-systems.com/try/ use --enable-gpl and have no mention of the GPL -- Ticket URL: <https://trac.ffmpeg.org/ticket/3454> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#3452(avformat:new): mpegts (h264) fails parsing AUs
by FFmpeg 10 Sep '14

10 Sep '14

#3452: mpegts (h264) fails parsing AUs -------------------------------------+------------------------------------- Reporter: FernetMenta | Type: defect Status: new | Priority: normal Component: avformat | Version: Keywords: mpegts | unspecified Blocking: | Blocked By: Analyzed by developer: 0 | Reproduced by developer: 0 -------------------------------------+------------------------------------- I have been carrying this sample for quite a while in my issues folder because I thought it was a faulty sample. https://dl.dropboxusercontent.com/u/47522966/sampleInterlaced.ts Playing it with XBMC (ffmpeg master branch) this results in stutter caused by missing frames from demuxer. pts coming out from decoder look like this: 12:35:25 T:140089427441408 DEBUG: CPullupCorrection: detected pattern of length 32: 33366.33 33366.67 33367.00 33366.33 33366.67 33367.00 33366.33 33366.67 33367.00 33366.33 33366.67 33367.00 33366.33 33366.67 33367.00 33366.33 33366.67 33367.00 33366.33 33366.67 33367.00 33366.33 33366.67 150144.67 -83411.33 33366.67 33367.00 150144.00 33367.00 33366.67 33366.33 33367.00, frameduration: 37015.968750 Playing the same sample through my vnsi demuxer/parser used for live tv ([https://github.com/FernetMenta/xbmc-pvr- addons/blob/vnsi5/addons/pvr.vdr.vnsi/vdr-plugin- vnsiserver/parser_h264.c]) results in clean timestamps: 12:36:04 T:140089256535808 DEBUG: CPullupCorrection: detected pattern of length 1: 33366.67, frameduration: 33366.666667 -- Ticket URL: <https://trac.ffmpeg.org/ticket/3452> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#3427(ffmpeg:new): Negative time format contains too many minuses: -577014:-32:-22.-77
by FFmpeg 31 Aug '14

31 Aug '14

#3427: Negative time format contains too many minuses: -577014:-32:-22.-77 -------------------------------------+------------------------------------- Reporter: | Type: defect q345t7n3o67ym23oy8939t | Priority: normal Status: new | Version: Component: ffmpeg | unspecified Keywords: format | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: time format for negative time contains too many minuses: "-577014:-32:-22.-77", but should be "-577014:32:22.77". ffmpeg version: N-60087-g94a5241 from http://ffmpeg.zeranoe.com/builds/ How to reproduce: {{{ % "ffmpeg.exe" -loglevel "debug" -i "http://93.95.99.231:8200/" -f "segment" -codec "copy" -map "0" -segment_format "mpegts" -segment_list "target file.csv" -segment_list_size "0" -segment_list_type "csv" -segment_time "906" -segment_start_number "0" -reset_timestamps "1" "target file %d.ts" }}} … and wait negative time. My ffmpeg log contains: {{{ frame=89905 fps= 25 q=-1.0 size=N/A time=00:59:57.34 bitrate=N/A frame=89921 fps= 25 q=-1.0 size=N/A time=00:59:57.97 bitrate=N/A frame=89936 fps= 25 q=-1.0 size=N/A time=00:59:58.57 bitrate=N/A frame=89952 fps= 25 q=-1.0 size=N/A time=-577014:-32:-22.-77 bitrate=N/A frame=89952 fps= 25 q=-1.0 Lsize=N/A time=00:59:59.15 bitrate=N/A }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/3427> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#3482(avfilter:new): New mode for showwaves filter
by FFmpeg 22 Aug '14

22 Aug '14

#3482: New mode for showwaves filter ----------------------------------+--------------------------------------- Reporter: mrskman | Type: enhancement Status: new | Priority: wish Component: avfilter | Version: git-master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ----------------------------------+--------------------------------------- If you generate a wave with showwave filter set to mode=point, you can get a result which is almost invisible because of high resolution (points are too far from each other). I suggest to add new mode=p2p which draws a line between those points and makes output more readable. I tried to do it on my own and here is the result: Example 1 - http://www.datafilehost.com/d/5b822974 (mode=point on top, mode=p2p on bottom) Example 2 - http://www.datafilehost.com/d/f0457d43 (mode=p2p standalone) Patch: http://www.datafilehost.com/d/af6aafad It's not perfect but it seems better to me. I would be glad if anyone can look at it or even improve it. Thank you for any reply. -- Ticket URL: <https://trac.ffmpeg.org/ticket/3482> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#3450(avformat:new): Unsupported mxf file containing dnxhd video
by FFmpeg 18 Aug '14

18 Aug '14

#3450: Unsupported mxf file containing dnxhd video -------------------------------------+------------------------------------- Reporter: cehoyos | Owner: Type: | Status: new enhancement | Component: avformat Priority: wish | Keywords: AVID mxf Version: git- | dnxhd master | Blocking: Blocked By: | Analyzed by developer: 0 Reproduced by developer: 0 | -------------------------------------+------------------------------------- http://thread.gmane.org/gmane.comp.video.ffmpeg.user/50830/focus=50888 A user uploaded a mxf file containing dnxhd video that the mxf demuxer cannot read. {{{ $ ffmpeg -loglevel 99 -i WriteAvidMXFgenerated/5502_0010_v1.mxf ffmpeg version N-61253-g27b4d15 Copyright (c) 2000-2014 the FFmpeg developers built on Mar 10 2014 13:23:55 with gcc 4.7 (SUSE Linux) configuration: --enable-gpl libavutil 52. 66.101 / 52. 66.101 libavcodec 55. 52.102 / 55. 52.102 libavformat 55. 34.100 / 55. 34.100 libavdevice 55. 11.100 / 55. 11.100 libavfilter 4. 3.100 / 4. 3.100 libswscale 2. 5.101 / 2. 5.101 libswresample 0. 18.100 / 0. 18.100 libpostproc 52. 3.100 / 52. 3.100 Splitting the commandline. Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument '99'. Reading option '-i' ... matched as input file with argument 'WriteAvidMXFgenerated/5502_0010_v1.mxf'. Finished splitting the commandline. Parsing a group of options: global . Applying option loglevel (set logging level) with argument 99. Successfully parsed a group of options. Parsing a group of options: input file WriteAvidMXFgenerated/5502_0010_v1.mxf. Successfully parsed a group of options. Opening an input file: WriteAvidMXFgenerated/5502_0010_v1.mxf. [mxf @ 0x32aa100] Format mxf probed with size=2048 and score=100 [mxf @ 0x32aa100] none: Universal Label: 060e2b34.0401.0101.0e040201.02040100 [mxf @ 0x32aa100] Field dominance 0 support is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented. [mxf @ 0x32aa100] If you want to help, upload a sample of this file to ftp://upload.ffmpeg.org/MPlayer/incoming/ and contact the ffmpeg-devel mailing list. [mxf @ 0x32aa100] Before avformat_find_stream_info() pos: 393191 bytes read:230022 seeks:7 [mxf @ 0x32aa100] parser not found for codec none, packets or times may be invalid. Last message repeated 1 times [mxf @ 0x32aa100] Probe buffer size limit of 5000000 bytes reached [mxf @ 0x32aa100] Could not find codec parameters for stream 0 (Video: none, 1920x1080, 1/25): unknown codec Consider increasing the value for the 'analyzeduration' and 'probesize' options [mxf @ 0x32aa100] After avformat_find_stream_info() pos: 5849088 bytes read:5685919 seeks:7 frames:9 WriteAvidMXFgenerated/5502_0010_v1.mxf: could not find codec parameters }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/3450> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#3412(avcodec:new): h264 gray decoding failure
by FFmpeg 17 Aug '14

17 Aug '14

#3412: h264 gray decoding failure --------------------------------------+--------------------------------- Reporter: cehoyos | Owner: Type: defect | Status: new Priority: minor | Component: avcodec Version: git-master | Keywords: h264 Blocked By: | Blocking: Reproduced by developer: 0 | Analyzed by developer: 0 --------------------------------------+--------------------------------- Output has green macroblocks, not a regression. {{{ $ ffmpeg -flags +gray -i fate-suite/h264/interlaced_crop.mp4 -qscale 2 out.avi ffmpeg version N-60871-g2a3cb1c Copyright (c) 2000-2014 the FFmpeg developers built on Feb 24 2014 11:17:11 with gcc 4.7 (SUSE Linux) configuration: --enable-gray libavutil 52. 66.100 / 52. 66.100 libavcodec 55. 52.102 / 55. 52.102 libavformat 55. 33.100 / 55. 33.100 libavdevice 55. 10.100 / 55. 10.100 libavfilter 4. 1.103 / 4. 1.103 libswscale 2. 5.101 / 2. 5.101 libswresample 0. 18.100 / 0. 18.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'fate- suite/h264/interlaced_crop.mp4': Metadata: major_brand : avc1 minor_version : 0 compatible_brands: isomavc1 creation_time : 2010-10-07 15:03:51 Duration: 00:00:05.04, start: 0.000000, bitrate: 551 kb/s Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 547 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc (default) Metadata: creation_time : 2010-10-07 15:03:51 handler_name : GPAC ISO Video Handler Please use -q:a or -q:v, -qscale is ambiguous Output #0, avi, to 'out.avi': Metadata: major_brand : avc1 minor_version : 0 compatible_brands: isomavc1 ISFT : Lavf55.33.100 Stream #0:0(und): Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 tbn, 25 tbc (default) Metadata: creation_time : 2010-10-07 15:03:51 handler_name : GPAC ISO Video Handler Stream mapping: Stream #0:0 -> #0:0 (h264 -> mpeg4) Press [q] to stop, [?] for help frame= 126 fps=0.0 q=2.0 Lsize= 2926kB time=00:00:05.04 bitrate=4755.8kbits/s video:2917kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead 0.296020% }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/3412> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#3471(undetermined:new): rpza: "MOV chunk size != encoded chunk size"
by FFmpeg 17 Aug '14

17 Aug '14

#3471: rpza: "MOV chunk size != encoded chunk size" -------------------------------------+------------------------------------- Reporter: ami_stuff | Owner: Type: defect | Status: new Priority: normal | Component: Version: | undetermined unspecified | Keywords: Blocked By: | Blocking: Reproduced by developer: 0 | Analyzed by developer: 0 -------------------------------------+------------------------------------- happens with valid files created by qt g958d98c - Feb 8 2014 - ok g6c12b1d - Feb 10 2014 - bad http://samples.mplayerhq.hu/V-codecs/RPZA/rpza2.mov {{{ C:\>ffmpeg -i rpza2.mov -f null - ffmpeg version N-61338-g12ce58b Copyright (c) 2000-2014 the FFmpeg developers built on Mar 12 2014 23:35:57 with gcc 4.8.2 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable- libfreetyp e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable- libvo-aa cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable- libwavp ack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable -zlib libavutil 52. 66.101 / 52. 66.101 libavcodec 55. 52.102 / 55. 52.102 libavformat 55. 34.101 / 55. 34.101 libavdevice 55. 11.100 / 55. 11.100 libavfilter 4. 3.100 / 4. 3.100 libswscale 2. 5.101 / 2. 5.101 libswresample 0. 18.100 / 0. 18.100 libpostproc 52. 3.100 / 52. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'rpza2.mov': Metadata: creation_time : 2000-07-23 09:33:23 Duration: 00:00:09.72, start: 0.000000, bitrate: 1711 kb/s Stream #0:0(eng): Video: rpza (rpza / 0x617A7072), rgb555le, 320x240, 1707 k b/s, 15 fps, 15 tbr, 600 tbn, 600 tbc (default) Metadata: creation_time : 2000-07-23 09:33:24 handler_name : Apple Alias Data Handler Output #0, null, to 'pipe:': Metadata: encoder : Lavf55.34.101 Stream #0:0(eng): Video: rawvideo (RGB[15] / 0xF424752), rgb555le, 320x240, q=2-31, 200 kb/s, 90k tbn, 15 tbc (default) Metadata: creation_time : 2000-07-23 09:33:24 handler_name : Apple Alias Data Handler Stream mapping: Stream #0:0 -> #0:0 (rpza -> rawvideo) Press [q] to stop, [?] for help [rpza @ 02cee8c0] MOV chunk size != encoded chunk size [null @ 02dd87c0] Encoder did not produce proper pts, making some up. [rpza @ 02cee8c0] MOV chunk size != encoded chunk size Last message repeated 144 times frame= 146 fps=0.0 q=0.0 Lsize=N/A time=00:00:09.73 bitrate=N/A video:9kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead -100.23 5443% }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/3471> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#3440(undetermined:new): vp8: a/v desync on seek with -auto-alt-ref 1
by FFmpeg 26 Jul '14

26 Jul '14

#3440: vp8: a/v desync on seek with -auto-alt-ref 1 -------------------------------------+------------------------------------- Reporter: blacktrash | Type: defect Status: new | Priority: normal Component: | Version: undetermined | unspecified Keywords: libvpx | Blocked By: auto-alt-ref | Reproduced by developer: 0 Blocking: | Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: How to reproduce: {{{ $ffmpeg -i BigBuckBunny_640x360.m4v -f webm -c:v libvpx -auto-alt-ref 1 -b:v 300k -c:a libvorbis -b:a 64k -pass 1 test.webm ffmpeg version N-61061-gf34cceb Copyright (c) 2000-2014 the FFmpeg developers built on Mar 4 2014 10:23:19 with Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn) configuration: --enable-gpl --enable-version3 --enable-nonfree --disable-ffserver --enable-shared --enable-libfdk-aac --enable-libx265 --enable-libx264 --enable-libxvid --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-librtmp --extra-cflags=-I/sw/include --extra-libs=-L/sw/lib libavutil 52. 66.101 / 52. 66.101 libavcodec 55. 52.102 / 55. 52.102 libavformat 55. 33.101 / 55. 33.101 libavdevice 55. 11.100 / 55. 11.100 libavfilter 4. 2.100 / 4. 2.100 libswscale 2. 5.101 / 2. 5.101 libswresample 0. 18.100 / 0. 18.100 libpostproc 52. 3.100 / 52. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'BigBuckBunny_640x360.m4v': Metadata: major_brand : M4V minor_version : 1 compatible_brands: M4V M4A mp42isom creation_time : 2008-06-03 05:23:28 copyright : © 2008 Blender Foundation | www.bigbuckbunny.org title : Big Buck Bunny artist : Peach Open Movie Team composer : Sacha Goedegebure / Ton Roosendaal date : 2008 Duration: 00:09:56.46, start: 0.000000, bitrate: 1626 kb/s Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default) Metadata: creation_time : 2008-06-03 05:23:28 handler_name : Apple Sound Media Handler Stream #0:1(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 640x360, 1495 kb/s, 24 fps, 24 tbr, 2400 tbn, 4800 tbc (default) Metadata: creation_time : 2008-06-03 05:23:28 handler_name : Apple Video Media Handler [libvpx @ 0x7f9e32801e00] v1.3.0-1648-g91e5e5a Output #0, webm, to 'test.webm': Metadata: major_brand : M4V minor_version : 1 compatible_brands: M4V M4A mp42isom date : 2008 copyright : © 2008 Blender Foundation | www.bigbuckbunny.org title : Big Buck Bunny artist : Peach Open Movie Team composer : Sacha Goedegebure / Ton Roosendaal encoder : Lavf55.33.101 Stream #0:0(eng): Video: vp8 (libvpx), yuv420p, 640x360, q=-1--1, pass 2, 300 kb/s, 1k tbn, 24 tbc (default) Metadata: creation_time : 2008-06-03 05:23:28 handler_name : Apple Video Media Handler Stream #0:1(eng): Audio: vorbis (libvorbis), 44100 Hz, stereo, fltp, 64 kb/s (default) Metadata: creation_time : 2008-06-03 05:23:28 handler_name : Apple Sound Media Handler Stream mapping: Stream #0:1 -> #0:0 (h264 -> libvpx) Stream #0:0 -> #0:1 (aac -> libvorbis) Press [q] to stop, [?] for help frame=14316 fps= 44 q=0.0 Lsize= 26255kB time=00:09:56.50 bitrate= 360.6kbits/s video:21847kB audio:4094kB subtitle:0 data:0 global headers:4kB muxing overhead 1.196710% }}} And same for -pass 2 produces a result where video and audio lose sync when seeking, be it in mplayer or in a html5 video tag. The problem is triggered by -auto-alt-ref 1, which is also in every libvpx preset. Omitting that option avoids the issue. Happens with all input videos I've tried so far. Aside: I would expect -auto-alt-ref 0 after -vpre to unset auto-alt-ref from the preset, but it does not: {{{ ffmpeg -i BigBuckBunny_640x360.m4v -f webm -vpre libvpx-360p -b:v 300k -auto-alt-ref 0 -c:a libvorbis -b:a 64k -pass 1 test.webm }}} also exhibits the problem, whereas giving all options except auto-alt-ref on the commandline again circumvents it. -- Ticket URL: <https://trac.ffmpeg.org/ticket/3440> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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