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• 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  Use -pix_fmt yuv420p for compatibility with outdated media players.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.

  


• ffmpeg : Command Execution failed

  29 janvier 2019, par PRABHJOT SINGH

  I am using this plugin plugin link and I am uploading mp4 videos and trying to compress the video on the server using node js FFmpeg module

  var vid = new ffmpeg( './' + req.file_name + '.mp4');
  
  vid.then(function (video) {
  
      video.setVideoSize('640x?', true, true)
  
          .save('./' + req.file_name + '_cp.mp4',
  
              function (err,file) {
  
                  if(err) {
  
                      res.send({status: 404, message: 'Unable to save video' })
  
                  } else {
  
                      revealCtrl.GetVideoData(req, res, next);
  
                  }
  
              })
  
  }, function (err) { });

  but it is not compressing my video and gives this error

  Here is the final command

  Command failed: ffmpeg -i ./jrbze37i.mp4  -strict -2  -filter_complex "scale=iw*sar:ih, pad=max(iw\,ih*(16/9)):ow/(16/9):(ow                                                                                                        -iw)/2:(oh-ih)/2" ./jrbze37i_cp.mp4 

  and here is the error

  Error: Command failed: ffmpeg -i ./jrbze37i.mp4  -strict -2  -filter_complex "scale=iw*sar:ih, pad=max(iw\,ih*(16/9)):ow/(16/9):(ow                                                                                                        -iw)/2:(oh-ih)/2" ./jrbze37i_cp.mp4
  
  ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg 
  
  developers
  
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
  configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build- 
  
  suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-                                                                                                        
  
  linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ -- 
  
  enable-gpl --enable-shared --disable-stripping --disable-decoder                                                                                                        
  
  =libopenjpeg --disable-decoder=libschroedinger --enable-avresample -- 
  
  enable-avisynth --enable-gnutls --enable-ladspa --enable-libass                                                                                                         
  
  --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio -- 
  
  enable-libflite --enable-libfontconfig --enable-libfreetype -                                                                                                        
  
  -enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug -- 
  
  enable-libmp3lame --enable-libopenjpeg --enable-libopus --en                                                                                                        
  
  able-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine 
  
  --enable-libsnappy --enable-libsoxr --enable-libspeex --ena                                                                                                        
  
  ble-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis -- 
  
  enable-libvpx --enable-libwavpack --enable-libwebp --enable-li                                                                                                        
  
  bx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl -- 
  
  enable-x11grab --enable-libdc1394 --enable-libiec61883 --en                                                                                                        
  
  able-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
  libavutil      54. 31.100 / 54. 31.100
  
  libavcodec     56. 60.100 / 56. 60.100
  
  libavformat    56. 40.101 / 56. 40.101
  
  libavdevice    56.  4.100 / 56.  4.100
  
  libavfilter     5. 40.101 /  5. 40.101
  
  libavresample   2.  1.  0 /  2.  1.  0
  
  libswscale      3.  1.101 /  3.  1.101
  
  libswresample   1.  2.101 /  1.  2.101
  
  libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './jrbze37i.mp4':
  
  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf58.26.100
  
  Duration: 00:00:53.22, start: 0.023220, bitrate: 1553 kb/s
  
  Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), 
  
  yuv420p, 1920x1080, 1418 kb/s, 30 fps, 30 tbr, 15360 tb                                                                                                        
  
  n, 60 tbc (default)
  
  Metadata:
  
    handler_name    : Core Media Video
  
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, 
  
  fltp, 128 kb/s (default)
  
  Metadata:
  
    handler_name    : Core Media Audio
  
  [libx264 @ 0x1567760] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 
  
  AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x1567760] profile High, level 4.0
  
  [libx264 @ 0x1567760] 264 - core 148 r2643 5c65704 - 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 tr                                                                                                        
  
  ellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 
  
  threads=1 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 ke                                                                                                        
  
  yint=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_r                                                                                                        
  
  atio=1.40 aq=1:1.00
  
  Output #0, mp4, to './jrbze37i_cp.mp4':
  
    Metadata:
  
   major_brand     : isom
  
   minor_version   : 512
  
   compatible_brands: isomiso2avc1mp41
  
   encoder         : Lavf56.40.101
  
   Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 
  
     1920x1080, q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
  
   Metadata:
  
    encoder         : Lavc56.60.100 libx264
  
   Stream #0:1(und): Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, mono, 
  
   fltp, 128 kb/s (default)
  
   Metadata:
  
    handler_name    : Core Media Audio
  
    encoder         : Lavc56.60.100 aac
  
   Stream mapping:
  
     Stream #0:0 (h264) -> scale (graph 0)
  
     pad (graph 0) -> Stream #0:0 (libx264)
  
     Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
     Press [q] to stop, [?] for help
  
     Killed   42 fps=5.1 q=29.0 size=      94kB time=00:00:01.34 bitrate= 
  
      574.7kbits/s dup=1 drop=0
  
  
  
     at ChildProcess.exithandler (child_process.js:276:12)
  
     at emitTwo (events.js:126:13)
  
     at ChildProcess.emit (events.js:214:7)
  
     at maybeClose (internal/child_process.js:915:16)
  
     at Socket.stream.socket.on (internal/child_process.js:336:11)
  
     at emitOne (events.js:116:13)
  
     at Socket.emit (events.js:211:7)
  
     at Pipe._handle.close [as _onclose] (net.js:561:12)
  
   killed: false,
  
   code: 137,
  
   signal: null,
  
   cmd: 'ffmpeg -i ./jrbze37i.mp4  -strict -2  -filter_complex 
  
      "scale=iw*sar:ih, pad=max(iw\\,ih*(16/9)):ow/(16/9):(ow-iw)/2:(oh- 
  
     ih)/2 " ./jrbze37i_cp.mp4'

  My problem is that sometimes its work or sometimes it doesn’t work.