November 2012 - ffmpeg-user - lists.ffmpeg.org

[N46146] Joined MPG = no sound
by Gilles 24 Dec '12

24 Dec '12

Hello I used the following command found in the FAQ to join several MPG files of a 2h conference I shot with my camcorder: ffmpeg -i concat:"file1.mpg|file2.mpg" -c copy output.mpg However, the video plays fine in VLC, but there's no sound. FWIW, the original files are saved as "video MPEG-1/2 (mpgv) 720x576 50fps + audio A52 (AC3, a52) 48KHz", and VLC says that the file has 85 streams instead of two (video + audio). What would be the right way to join the files before reducing the size of the output file (9GB)? Thank you.

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Video seems to play back faster than the recorded sound
by Kai Hendry 21 Dec '12

21 Dec '12

Hi there, Just encountered a good example of this problem hitting me. My machine is a Archlinux 3.6.6 i7-2620M CPU @ 2.70GHz with 4G of RAM, so I can't see the machine being too slow. The huge recorded mkv file exhibits the problem when playing back with ffplay. Then transcoded {mp4,webm} also show the video playing too fast with the audio being out of sync: http://r2d2.webconverger.org/2012-11-23/st-c96fca73c600.html The log file is here: http://r2d2.webconverger.org/2012-11-23/st-c96fca73c600.log Can anyone advise what I might be doing wrong? Kind regards,

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vob->mpeg4 with subtitle track
by Alon Bar-Lev 11 Dec '12

11 Dec '12

Hello All, I know this had been discussed some times, but I could not fine any definite answer... I have vob file with dvdsub stream, I want this stream to be embedded within the output mpeg4. I could not find any way to do so. I tried to use subtitle codecs such as mpeg4 and such, and could not find any working sequence. What I am getting is: [avi @ 0x4513df04e40] Subtitle streams other than DivX XSUB are not supported by the AVI muxer. I did find that srt can be embedded, but I have no srt, I want to embed the current stream. Thank you, Alon Bar-Lev. --- ffmpeg \ -i "${input}" \ -map 0:0 \ -map 0:1 \ -map 0:2 \ -codec:v mpeg4 \ -codec:a copy \ -codec:s copy \ -qscale:v 4 \ -threads 6 \ -y "${output}" ffmpeg version 0.10.3 Copyright (c) 2000-2012 the FFmpeg developers built on Nov 19 2012 14:12:32 with gcc 4.5.4 configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-O2 -march=native -fomit-frame-pointer -pipe' --extra-cflags='-O2 -march=native -fomit-frame-pointer -pipe' --extra-cxxflags='-O2 -march=native -fomit-frame-pointer -pipe' --disable-static --enable-gpl --enable-version3 --enable-postproc --enable-avfilter --disable-stripping --disable-debug --disable-doc --disable-network --disable-vaapi --disable-vdpau --disable-ffplay --enable-libmp3lame --enable-libvo-aacenc --enable-libvorbis --enable-libxvid --disable-indev=v4l --disable-indev=oss --disable-indev=jack --enable-x11grab --disable-outdev=oss --disable-outdev=sdl --enable-libopenjpeg --disable-amd3dnow --disable-amd3dnowext --disable-altivec --disable-mmx2 --disable-vis --disable-neon --cpu=host --enable-hardcoded-tables libavutil 51. 35.100 / 51. 35.100 libavcodec 53. 61.100 / 53. 61.100 libavformat 53. 32.100 / 53. 32.100 libavdevice 53. 4.100 / 53. 4.100 libavfilter 2. 61.100 / 2. 61.100 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 6.100 / 0. 6.100 libpostproc 52. 0.100 / 52. 0.100 [mpeg @ 0x4513defe480] max_analyze_duration 5000000 reached at 5000000 Input #0, mpeg, from '1-01-2.vob': Duration: 00:10:04.19, start: 165.932000, bitrate: 6289 kb/s Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 16:15 DAR 4:3], 9000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #0:1[0x80]: Audio: ac3, 48000 Hz, 5.1(side), s16, 448 kb/s Stream #0:2[0x20]: Subtitle: dvd_subtitle [buffer @ 0x4513df05d40] w:720 h:576 pixfmt:yuv420p tb:1/1000000 sar:16/15 sws_param: [avi @ 0x4513df04e40] Subtitle streams other than DivX XSUB are not supported by the AVI muxer. Output #0, avi, to '1-01-2.avi': Metadata: encoder : Lavf53.32.100 Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 720x576 [SAR 16:15 DAR 4:3], q=2-31, 200 kb/s, 25 tbn, 25 tbc Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), 448 kb/s Stream #0:2: Subtitle: dvd_subtitle Stream mapping: Stream #0:0 -> #0:0 (mpeg2video -> mpeg4) Stream #0:1 -> #0:1 (copy) Stream #0:2 -> #0:2 (copy) Could not write header for output file #0 (incorrect codec parameters ?)

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encode once, send to 2 locations?
by Roger Pack 07 Dec '12

07 Dec '12

Hello. Similar to https://ffmpeg.org/trac/ffmpeg/ticket/1382, I'm wondering if it's possible to take an incoming stream, transcode it *once* to libx264, then basically send 1 copy to a server, and save 1 copy to a file. Is this possible? Thanks! -r

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ffserver help
by Obedinho 05 Dec '12

05 Dec '12

hi, i'm trying to do video streaming with ffserver and ffmpeg, but i have problems, i can't see the video, this is my ffserver.conf: Port 8090 BindAddress 0.0.0.0 MaxClients 1000 MaxBandwidth 10000 <Feed feed1.ffm> File /tmp/feed1.ffm FileMaxSize 5M </Feed> <Feed feed2.ffm> File /tmp/feed2.ffm FileMaxSize 5M </Feed> <Stream camara1.flv> Feed feed1.ffm Format flv VideoCodec flv VideoBitRate 128 VideoBufferSize 500 VideoFrameRate 5 VideoSize 320×240 NoAudio Preroll 5 </Stream> <Stream camara2.flv> Feed feed2.ffm Format flv VideoCodec flv VideoBitRate 128 VideoBufferSize 500 VideoFrameRate 5 VideoSize 320×240 NoAudio Preroll 5 </Stream> <Stream stat.html> Format status </Stream> I run the ffserver : ffserver -f /etc/myserver.conf the avconv line is: avconv -f video4linux2 -i /dev/video0 -an http://localhost:8090/feed1.ffm when i try to see the video, ffplay (ffplay http://localhost:8090/canal1.flv ) the output is : ffplay http://localhost:8090/camara1.flv avplay version 0.8.1-4:0.8.1-0ubuntu1, Copyright (c) 2003-2011 the Libav developers built on Mar 22 2012 05:29:10 with gcc 4.6.3 [flv @ 0xb2200480] Format detected only with low score of 25, misdetection possible! [flv @ 0xb2200480] Broken FLV file, which says no streams present, this might fail [flv @ 0xb2200480] decoding for stream 0 failed [flv @ 0xb2200480] decoding for stream 1 failed [flv @ 0xb2200480] Estimating duration from bitrate, this may be inaccurate http://localhost:8090/camara1.flv: could not find codec parameters anybody have any idea? PD.- sorry but my bad english :P -- View this message in context: http://ffmpeg-users.933282.n4.nabble.com/ffserver-help-tp4650541.html Sent from the FFmpeg-users mailing list archive at Nabble.com.

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libdc1394 troubles
by Bryan Goldstein 03 Dec '12

03 Dec '12

Hello, I am new to ffmpeg and I am having some trouble using my libdc1394 supported webcam with it. I keep getting the same error: ---- [libdc1394 @ 0x1722520] Can't find matching camera format for uyvy422, 320x240@29970:1000fps hw:0,0: Operation not permitted ---- Here is some build info: ffmpeg version N-47291-g0b14c19 Copyright (c) 2000-2012 the FFmpeg developers built on Nov 30 2012 01:11:28 with gcc 4.5.3 (GCC) 20110311 (prerelease) configuration: --enable-libdc1394 libavutil 52. 9.102 / 52. 9.102 libavcodec 54. 77.100 / 54. 77.100 libavformat 54. 40.100 / 54. 40.100 libavdevice 54. 3.100 / 54. 3.100 libavfilter 3. 23.104 / 3. 23.104 libswscale 2. 1.103 / 2. 1.103 libswresample 0. 17.101 / 0. 17.101 libdc1394 version is 2.2.0 Camera is Chameleon CMLN-13S2C Does anyone have any idea as to what I could be doing wrong? Thanks, Bryan

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Video and audio out of sync - general question
by Frank Häfemeier 01 Dec '12

01 Dec '12

Hi, I am converting HD video (H264, mp2/ac3, TS container) captured from cable TV into mp4 container (x264, aac). I am also copy (if existing the original ac3 stream as an additional stream into the mp4 container, especially in case of a 5.1 audio. Sometimes happens the audio is not in sync with video. In this case I use the asyncts filter with 'first_pts=0'. This works well but only if I encode all audio streams. Is it really necessary to encode instead of copy? I tried to copy the stream and using the filter, but the audio was still not in sync. Is there a special order of parameter relevant? Bye Frank

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AAC "channel element not allocated"
by robin 01 Dec '12

01 Dec '12

Hi: I have a .aacfile (4Channels.aac) which shows up with 4 audio channels, and produces the famous channel element 3.0 is not allocated" message when ffmpeg tries to decode it. the version of ffmpeg is ffmpeg-0.11.2 . and the configure is as follow: --enable-shared --disable-static why? thanks -- Best Regards.

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Sticky subtiles when hardcoding them with -filter_complex
by Tim Hughes 29 Nov '12

29 Nov '12

Hi, I've been attempting to use the experimental ffmpeg feature to burn bitmap subtitles following the example in the doc. Here's my commandline: ffmpeg.exe -probesize 1G -analyzeduration 200M -i VTS_01_1.VOB -t 600 \ -fix_sub_duration -filter_complex "[0:6] negate [sub] ; [0:0] [sub] overlay" \ -vcodec mpeg4 -b:v 3000k -b:a 160k -map 0:2 -ac 2 output.mp4 It works correctly, apart from the problem that the subtitles never disappear during silence. Each subtitle stays on screen until it is finally replaced by the next. I've tried with and without the fix_sub_duration option, and the negate filter. Anyone know what I'm doing wrong? Thanks in advance Tim >>>>> ffmpeg version N-47062-g26c531c Copyright (c) 2000-2012 the FFmpeg developers built on Nov 25 2012 12:25:21 with gcc 4.7.2 (GCC) configuration: --enable-gpl --enable-version3 --disable-pthreads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib libavutil 52. 9.100 / 52. 9.100 libavcodec 54. 77.100 / 54. 77.100 libavformat 54. 37.100 / 54. 37.100 libavdevice 54. 3.100 / 54. 3.100 libavfilter 3. 23.102 / 3. 23.102 libswscale 2. 1.102 / 2. 1.102 libswresample 0. 17.101 / 0. 17.101 libpostproc 52. 2.100 / 52. 2.100 [mpeg @ 000000000034eca0] max_analyze_duration 200000000 reached at 200000000 Input #0, mpeg, from 'VTS_01_1.VOB': Duration: 01:36:36.40, start: 0.280000, bitrate: 7112 kb/s Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #0:1[0x83]: Audio: ac3, 48000 Hz, stereo, s16, 224 kb/s Stream #0:2[0x80]: Audio: ac3, 48000 Hz, 5.1(side), s16, 448 kb/s Stream #0:3[0x82]: Audio: ac3, 48000 Hz, 5.1(side), s16, 448 kb/s Stream #0:4[0x89]: Audio: dts (DTS), 48000 Hz, 5.1(side), fltp, 768 kb/s Stream #0:5[0x21]: Subtitle: dvd_subtitle Stream #0:6[0x20]: Subtitle: dvd_subtitle [mpeg @ 000000000034eca0] sub2video: using 720x576 canvas Output #0, mp4, to 'output.mp4': Metadata: encoder : Lavf54.37.100 Stream #0:0: Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 720x576 [SAR 64:45 DAR 16:9], q=2-31, 3000 kb/s, 12800 tbn, 25 tbc Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 160 kb/s Stream mapping: Stream #0:0 (mpeg2video) -> overlay:main (graph 0) Stream #0:6 (dvdsub) -> negate (graph 0) overlay (graph 0) -> Stream #0:0 (mpeg4) Stream #0:2 -> #0:1 (ac3 -> libvo_aacenc) Press [q] to stop, [?] for help [mpeg2video @ 000000000034f7a0] warning: first frame is no keyframe frame=15000 fps= 97 q=2.0 Lsize= 231879kB time=00:10:00.00 bitrate=3165.9kbits/s dup=6 drop=1 video:219824kB audio:11720kB subtitle:0 global headers:0kB muxing overhead 0.145019%

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Exporting metadata
by Emily W Watt 29 Nov '12

29 Nov '12

Hello, Is the "ffmetadata" forced format option (-f) only supported in the latest version of ffmpeg? I am running ffmpeg 0.6.6 (as the Linux box I am running ffmpeg on cannot successfully build/run ffmpeg 1.0). If not, any recommendations on how to export the metadata to an output file? I am trying to inject some metadata fields into a sample .TS file I have that has not metadata on it and simply extract metadata by reading key-value pairs saved in the output file. I have gotten it to work successfully for 1.0 but 0.6.6 doesn't seem to recognize the "ffmetadata" option. Thanks for any help in advance! Emily

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