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• Screen capture WITH audio in ffmpeg

  6 avril 2015, par Adam Kurkiewicz

  I am using ffmpeg built from source at this revision in Fedora 20.

  I am able to record audio perfectly fine with the command :

  FFmpeg/ffmpeg -f alsa -ac 2 -i pulse -- output.wav

  However, when I try both screen capture and audio, like this :

  FFmpeg/ffmpeg -video_size 800x600 -framerate 25 -ac 2 -f x11grab -i :0.0+0,0 -ac 2 -f alsa -i pulse -ac 2 -acodec copy output.mpeg -ac 2

  I’m getting a video with 0 audio channels, which I can check running FFmpeg/ffplay output.mpeg

  Input #0, mpeg, from 'output.mpeg':
  
    Duration: 00:00:09.44, start: 0.540000, bitrate: 2743 kb/s
  
      Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 800x600 [SAR 1:1 DAR 4:3], 104857 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
  
      Stream #0:1[0x1c0]: Audio: mp2, 0 channels, s16p
  
     7.26 M-V:  0.000 fd=   0 aq=    0KB vq=   33KB sq=    0B f=0/0   

  and no audible sound is played. The position of -ac 2 doesn’t change the behaviour, nor does repeating it only once. This is despite ffmpeg claims to record the audio with 2 channels, here is the input :

  ffmpeg version N-71312-ga66dcfe Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.8.3 (GCC) 20140911 (Red Hat 4.8.3-7)
  
    configuration: 
  
    libavutil      54. 22.100 / 54. 22.100
  
    libavcodec     56. 34.100 / 56. 34.100
  
    libavformat    56. 29.100 / 56. 29.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 13.101 /  5. 13.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
  Trailing options were found on the commandline.
  
  Input #0, x11grab, from ':0.0+0,0':
  
    Duration: N/A, start: 1428348285.201679, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 800x600, 25 fps, 25 tbr, 1000k tbn, 25 tbc
  
  Guessed Channel Layout for  Input Stream #1.0 : stereo
  
  Input #1, alsa, from 'pulse':
  
    Duration: N/A, start: 1428348285.225901, bitrate: 1536 kb/s
  
      Stream #1:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  
   File 'output.mpeg' already exists. Overwrite ? [y/N] y
  
  [mpeg @ 0x2d079a0] VBV buffer size not set, using default size of 130KB
  
  If you want the mpeg file to be compliant to some specification
  
  Like DVD, VCD or others, make sure you set the correct buffer size
  
  Output #0, mpeg, to 'output.mpeg':
  
    Metadata:
  
      encoder         : Lavf56.29.100
  
      Stream #0:0: Video: mpeg1video, yuv420p, 800x600, q=2-31, 200     kb/s, 25 fps, 90k tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc56.34.100 mpeg1video
  
      Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, 1536 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg1video (native))
  
    Stream #1:0 -> #0:1 (copy)

  I’m clueless. If anybody can tell me how to get this to work by either :

  • fixing my mistakes in the command line flags
  • if it’s a regression, which revision to build from.
  • any other way

  I’ll buy him/her a pint.

• Revision 85697 : Corriger le mode full-screen : - ajaxload async pour ne pas manger les ...

  28 octobre 2014, par cedric@… — Log

  Corriger le mode full-screen :
   ajaxload async pour ne pas manger les touches saisies pendant ce temps la
   style du ajaxload pour vour la roue de chargement

• FFMPEG Screen Capture Issue

  15 avril 2015, par William Goodwin

  Sorry if this has been solved but I couldn’t find it.

  I’m trying to screen capture using ffmpeg and stream it to Twitch. I have both x11grab and libx264 enabled but when I give it the input for my monitor it keeps returning :

  :0.0+0,0: Protocol not found

  I confirmed that :0.0 is indeed my $DISPLAY variable, and even if I call that directly in my script with the same error. My script is as follows :

  #!/bin/bash
  
  
  
  # Stream Variables
  
  STREAM_KEY="<not shown="shown">"
  
  INRES="1680x1050"
  
  OUTRES="1024x768"
  
  FPS="30"
  
  BITRATE="1266k"
  
  BUFFER="1266k"
  
  AUDIO_BITRATE="160k"
  
  
  
  ffmpeg -f alsa -ac 2 -i hw:0,0 -f x11grab -framerate $FRAMERATE -video_size $INRES \
  
     -i :0.0+0,0 -vcodec libx264 -preset veryfast -maxrate $BITRATE -bufsize $BUFFER \
  
     -vf "scale=$OUTRES, format=yuv420p" -g $(expr $FPS \* 2) -acodec libfdk_aac -b:a $AUDIO_BITRATE \
  
     -f flv rtmp://liva-jfk.twitch.tv/app/$STREAM_KEY
  
  </not>

  I’m on Debian Jessie(Testing) and ffmpeg and associated packages come from deb-multimedia. I’m curious if maybe someone here can see something I might have missed.

  Sidenote : I know the same display is called in programs like ScreenStudio and they work, but aren’t as flexible. I’ve tried using obs-studio for linux and it crashes with an illegal command when I start recording which makes me wonder if this is a system problem that might be the cause of that.