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  • ffmpeg doesn't correctly work with mkv

    26 avril 2017, par Alex

    Now I’m trying to trim mkv file with ffmpeg command.

    ffmpeg -y -i 1.mkv -filter_complex "[0:0]trim=start=201:duration=28,setpts=PTS-STARTPTS" a.mp4

    after processing a.mp4 is created with length(28s), but there is problems.

    1. Video is some flapped while playing.
    2. Audio is continued though playing has ended beyond 28s.

    So could you guys tell me what can I do ?

    When ffmpeg processing, it shows some errors as like this :

    D:\Work\ffmpeg\files> ffmpeg -y -i 1.mkv -filter_complex "[0:0]trim=start=201:duration=28,setpts=PTS-STARTPTS" a.mp4
    
ffmpeg version N-77883-gd7c75a5 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 5.2.0 (GCC)
    
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
    
  libavutil      55. 13.100 / 55. 13.100
    
  libavcodec     57. 22.100 / 57. 22.100
    
  libavformat    57. 21.101 / 57. 21.101
    
  libavdevice    57.  0.100 / 57.  0.100
    
  libavfilter     6. 25.100 /  6. 25.100
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
Guessed Channel Layout for  Input Stream #0.1 : mono
    
Input #0, matroska,webm, from '1.mkv':
    
  Metadata:
    
    ENCODER         : Lavf56.1.0
    
  Duration: 00:35:40.08, start: 0.000000, bitrate: 348 kb/s
    
    Stream #0:0: Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc
    
    Stream #0:1: Audio: pcm_mulaw ([7][0][0][0] / 0x0007), 8000 Hz, 1 channels, s16, 64 kb/s
    
[libx264 @ 000002859baf3300] using SAR=1/1
    
[libx264 @ 000002859baf3300] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 000002859baf3300] profile High, level 3.0
    
[libx264 @ 000002859baf3300] 264 - core 148 r2638 7599210 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
Output #0, mp4, to 'a.mp4':
    
  Metadata:
    
    encoder         : Lavf57.21.101
    
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc
    
    Metadata:
    
      encoder         : Lavc57.22.100 libx264
    
    Side data:
    
      unknown side data type 10 (24 bytes)
    
    Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 8000 Hz, mono, fltp, 48 kb/s
    
    Metadata:
    
      encoder         : Lavc57.22.100 aac
    
Stream mapping:
    
  Stream #0:0 (vp8) -> trim (graph 0)
    
  setpts (graph 0) -> Stream #0:0 (libx264)
    
  Stream #0:1 -> #0:1 (pcm_mulaw (native) -> aac (native))
    
Press [q] to stop, [?] for help
    
[vp8 @ 000002859d9ae460] Discarding interframe without a prior keyframe!
    
[vp8 @ 000002859d9aeb00] Discarding interframe without a prior keyframe!
    
[vp8 @ 000002859e8eee40] Discarding interframe without a prior keyframe!
    
[vp8 @ 000002859e8f5460] Discarding interframe without a prior keyframe!
    
Error while decoding stream #0:0: Invalid data found when processing input
    
    Last message repeated 3 times
    
frame=    0 fps=0.0 q=0.0 size=      62kB time=00:00:22.27 bitrate=  22.6kbits/s
    
frame=    0 fps=0.0 q=0.0 size=     154kB time=00:00:41.08 bitrate=  30.6kbits/s
    
frame=    0 fps=0.0 q=0.0 size=     255kB time=00:01:02.20 bitrate=  33.6kbits/s
    
frame=    0 fps=0.0 q=0.0 size=     340kB time=00:01:19.34 bitrate=  35.1kbits/s
    
frame=    0 fps=0.0 q=0.0 size=     423kB time=00:01:39.31 bitrate=  34.9kbits/s
    
frame=   88 fps= 29 q=29.0 size=     518kB time=00:01:43.79 bitrate=  40.9kbits/
    
frame=  140 fps= 40 q=29.0 size=     613kB time=00:01:45.46 bitrate=  47.6kbits/
    
frame=  194 fps= 48 q=29.0 size=     719kB time=00:01:47.38 bitrate=  54.8kbits/
    

    
...
    

    

    
frame=  839 fps= 14 q=29.0 size=   10881kB time=00:34:51.52 bitrate=  42.6kbits/
    
frame=  839 fps= 14 q=29.0 size=   10962kB time=00:35:10.46 bitrate=  42.5kbits/
    
frame=  839 fps= 14 q=29.0 size=   11031kB time=00:35:25.44 bitrate=  42.5kbits/
    
frame=  839 fps= 14 q=-1.0 Lsize=   11266kB time=00:35:40.16 bitrate=  43.1kbits/s dup=284 drop=328 speed=34.6x
    
video:1083kB audio:10104kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.706855%
    
[libx264 @ 000002859baf3300] frame I:4     Avg QP:15.24  size: 22651
    
[libx264 @ 000002859baf3300] frame P:305   Avg QP:19.95  size:  2626
    
[libx264 @ 000002859baf3300] frame B:530   Avg QP:25.41  size:   408
    
[libx264 @ 000002859baf3300] consecutive B-frames: 15.7%  0.0%  0.4% 83.9%
    
[libx264 @ 000002859baf3300] mb I  I16..4: 15.9% 63.7% 20.4%
    
[libx264 @ 000002859baf3300] mb P  I16..4:  0.3%  1.9%  0.3%  P16..4: 22.3%  6.2%  2.4%  0.0%  0.0%    skip:66.5%
    
[libx264 @ 000002859baf3300] mb B  I16..4:  0.0%  0.1%  0.0%  B16..8: 16.1%  0.6%  0.1%  direct: 0.2%  skip:82.9%  L0:48.2% L1:48.5% BI: 3.4%
    
[libx264 @ 000002859baf3300] 8x8 transform intra:71.1% inter:71.4%
    
[libx264 @ 000002859baf3300] coded y,uvDC,uvAC intra: 72.2% 78.3% 40.7% inter: 5.9% 4.0% 0.1%
    
[libx264 @ 000002859baf3300] i16 v,h,dc,p: 29% 30% 21% 20%
    
[libx264 @ 000002859baf3300] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 18% 14%  5%  6%  9%  6%  9%  6%
    
[libx264 @ 000002859baf3300] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 38% 20% 11%  5%  5%  7%  5%  6%  4%
    
[libx264 @ 000002859baf3300] i8c dc,h,v,p: 46% 16% 27% 11%
    
[libx264 @ 000002859baf3300] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 000002859baf3300] ref P L0: 63.4% 21.5% 11.5%  3.6%
    
[libx264 @ 000002859baf3300] ref B L0: 92.6%  6.4%  1.0%
    
[libx264 @ 000002859baf3300] ref B L1: 96.4%  3.6%
    
[libx264 @ 000002859baf3300] kb/s:316.59
    
[aac @ 000002859baf4400] Qavg: 65377.508
    

    
D:\Work\ffmpeg\files>

  • compile ffmpeg with alsa support on Ubuntu 12.04 amd64

    6 octobre 2015, par user1129812

    I had followed the ffmpeg compile instructions described in "CompilationGuide/Ubuntu – FFmpeg" and had successfully compiled a version of ffmpeg on my Ubuntu 12.04 amd64 system. This compiled version of ffmpeg works ok for my normal usage. However, recently, I want to grab my Ubuntu desktop with sound from applications, I follow the instructions in "HOWTO : Proper Screencasting on Linux" and I use the command :

    ~/bin/ffmpeg -f alsa -ac 2 -i hw:0 -f x11grab -r 30 -s 1024x768 -i :0.0 -acodec pcm_s16le -vcodec libx264 -preset ultrafast -crf 0 -threads 0 out_video_test.mkv

    to want to grab my Ubuntu desktop with sound from application. The terminal output from this command is :

    ffmpeg version 2.4.git Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Oct 13 2014 17:38:17 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
    
  configuration: --prefix=/home/tkwinfo/ffmpeg_build --extra-cflags=-I/home/tkwinfo/ffmpeg_build/include --extra-ldflags=-L/home/tkwinfo/ffmpeg_build/lib --bindir=/home/tkwinfo/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
    
  libavutil      54. 10.100 / 54. 10.100
    
  libavcodec     56.  4.101 / 56.  4.101
    
  libavformat    56.  9.100 / 56.  9.100
    
  libavdevice    56.  1.100 / 56.  1.100
    
  libavfilter     5.  1.103 /  5.  1.103
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  1.100 / 53.  1.100
    
Guessed Channel Layout for  Input Stream #0.0 : stereo
    
Input #0, alsa, from 'hw:0':
    
  Duration: N/A, start: 1444111224.703996, bitrate: 1536 kb/s
    
    Stream #0:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
    
[x11grab @ 0x3971360] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 1024 height: 768
    
[x11grab @ 0x3971360] shared memory extension found
    
Input #1, x11grab, from ':0.0':
    
  Duration: N/A, start: 1444111224.739397, bitrate: 754974 kb/s
    
    Stream #1:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1024x768, 754974 kb/s, 30 tbr, 1000k tbn, 30 tbc
    
No pixel format specified, yuv444p for H.264 encoding chosen.
    
Use -pix_fmt yuv420p for compatibility with outdated media players.
    
[libx264 @ 0x39941e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x39941e0] profile High 4:4:4 Predictive, level 3.1, 4:4:4 8-bit
    
[libx264 @ 0x39941e0] 64 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=0 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=cqp mbtree=0 qp=0
    
Output #0, matroska, to 'out_video_test.mkv':
    
  Metadata:
    
    encoder         : Lavf56.9.100
    
    Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p, 1024x768, q=-1--1, 30 fps, 1k tbn, 30 tbc
    
    Metadata:
    
      encoder         : Lavc56.4.101 libx264
    
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
    
    Metadata:
    
      encoder         : Lavc56.4.101 pcm_s16le
    
Stream mapping:
    
  Stream #1:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
    
  Stream #0:0 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native))
    
Press [q] to stop, [?] for help
    
frame=   16 fps=0.0 q=0.0 size=    1370kB time=00:00:00.54 bitrate=20438.5kbits/
    
frame=   31 fps= 31 q=0.0 size=   etc, etc

    The video part is grabbed ok but there is no sound in the output video. I had followed the procedures described in the FAQ in "HOWTO : Proper Screencasting on Linux" to use "pavucontrol" to set "capture application audio instead of mic". However, I still could only grab video from my Ubuntu desktop.

    I find that I have installed libasound2-dev in my Ubuntu 12.04 amd64 system. The "libasound.so" file is in /usr/lib/x86_64-linux-gnu while the "asoundlib.h" file is in /usr/include/alsa. The config options when I compile ffmpeg is :

    PATH="$PATH:$HOME/bin" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure 
    
  --prefix="$HOME/ffmpeg_build" 
    
  --extra-cflags="-I$HOME/ffmpeg_build/include" 
    
  --extra-ldflags="-L$HOME/ffmpeg_build/lib" 
    
  --bindir="$HOME/bin" 
    
  --enable-gpl 
    
  --enable-libass 
    
  --enable-libfdk-aac 
    
  --enable-libfreetype 
    
  --enable-libmp3lame 
    
  --enable-libopus 
    
  --enable-libtheora 
    
  --enable-libvorbis 
    
  --enable-libvpx 
    
  --enable-libx264 
    
  --enable-nonfree 
    
  --enable-x11grab

    I want to know that how do I find out whether I have compiled the alsa support into my ffmpeg ? Do I need to add the ffmpeg config option

    --extra-libs=-lasound

    to get alsa support when compiling ffmpeg ? (as described in some discussions in the internet) If yes, how do I specify the paths of "libasound.so" and "asoundlib.h" so that they would be used in the ffmpeg compilation process ?

    Moreover, if alsa support is already compiled in my ffmpeg, what else should I try so as to be able to grab sound from application using my ffmpeg ?

    Any idea. Thanks for any suggestion.

  • How to config FFmpeg for xrgb and Aver Media capture card [closed]

    12 mai 2023, par Plotter Desalor

    I'm trying to use FFmpeg through ffplay to display a capture card output as lossless as possible.

    


    My capture card is named "Live Gamer Ultra-Video"

    


    In OBS, the NV12, YV12, P010 and YUY2 lead to blurriness around text and fine pixels edges, but the XRGB one offer clear output. So I've tried to focus on this mode with FFmpeg as the default one lead to same blurriness seen in OBS.

    


    Running "ffmpeg -f dshow -list_options true -i video="Live Gamer Ultra-Video" show me this result
(i've only kept line with wanted resolution)

    


    ffmpeg version 6.0-essentials_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      58.  2.100 / 58.  2.100
  libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100
[dshow @ 00000240bf0eac40] DirectShow video device options (from video devices)
[dshow @ 00000240bf0eac40]  Pin "Capturer" (alternative pin name "0")
[dshow @ 00000240bf0eac40]   pixel_format=yuyv422  min s=2560x1440 fps=30 max s=2560x1440 fps=50
[dshow @ 00000240bf0eac40]   pixel_format=yuyv422  min s=2560x1440 fps=30 max s=2560x1440 fps=50 (tv, bt709/bt709/unknown, topleft)
[dshow @ 00000240bf0eac40]   pixel_format=yuv420p  min s=2560x1440 fps=30 max s=2560x1440 fps=60.0002
[dshow @ 00000240bf0eac40]   pixel_format=yuv420p  min s=2560x1440 fps=30 max s=2560x1440 fps=60.0002 (tv, bt709/bt709/unknown, topleft)
[dshow @ 00000240bf0eac40]   pixel_format=nv12  min s=2560x1440 fps=30 max s=2560x1440 fps=60.0002
[dshow @ 00000240bf0eac40]   pixel_format=nv12  min s=2560x1440 fps=30 max s=2560x1440 fps=60.0002 (tv, bt709/bt709/unknown, topleft)
[dshow @ 00000240bf0eac40]   unknown compression type 0xE436EB7D  min s=2560x1440 fps=30 max s=2560x1440 fps=30
[dshow @ 00000240bf0eac40]   unknown compression type 0xE436EB7D  min s=2560x1440 fps=30 max s=2560x1440 fps=30 (tv, bt709/bt709/unknown, topleft)
[dshow @ 00000240bf0eac40]   unknown compression type 0x30313050  min s=2560x1440 fps=30 max s=2560x1440 fps=30
[dshow @ 00000240bf0eac40]   unknown compression type 0x30313050  min s=2560x1440 fps=30 max s=2560x1440 fps=30 (tv, bt709/bt709/unknown, topleft)

video=Live Gamer Ultra-Video: Immediate exit requested


    


    "unknown compression type 0xE436EB7D" is a pretty bad start but from https://trac.ffmpeg.org/ticket/6279 I could figured out it was just unproperly parsed RGB24 format

    


    But if I run a very simple "ffplay -f dshow -i video="Live Gamer Ultra-Video" -pixel_format rgb24"
I got this output

    


    ffplay version 6.0-essentials_build-www.gyan.dev Copyright (c) 2003-2023 the FFmpeg developers
  built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      58.  2.100 / 58.  2.100
  libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100
[dshow @ 000001ec3fa39300] Could not set video options   0B f=0/0
video=Live Gamer Ultra-Video: I/O error


    


    How could I use rgb format with this capture card ?

    


    If not possible, any other format leading to proper output would be ok too.
I've tried parameters from this topic Capture full-range/lossless rgb frame from capture card that supports NV12 and YUYV output without any good result sadly.

    


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