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• How to record audio with ffmpeg on linux ?

  7 décembre 2014, par Conor Patrick

  I’d like to record audio from my microphone. My OS is ubuntu. I’ve tried the following and got errors

  $ ffmpeg -f alsa -ac 2 -i hw:1,0 -itsoffset 00:00:00.5 -f video4linux2 -s 320x240 -r 25 /dev/video0 out.mpg
  
  
  
  ffmpeg version 0.8.8-4:0.8.8-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav
  
  developers
  
    built on Oct 22 2013 12:31:55 with gcc 4.6.3
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release.
  
  Please use avconv instead.
  
  ALSA lib conf.c:3314:(snd_config_hooks_call) Cannot open shared library
  
  libasound_module_conf_pulse.so
  
  ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM hw:1,0
  
  [alsa @ 0xbda7a0] cannot open audio device hw:1,0 (No such file or directory)
  
  hw:1,0: Input/output error

  Then I tried

  $ ffmpeg -f oss -i /dev/dsp audio.mp3
  
  
  
  ffmpeg version 0.8.8-4:0.8.8-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav
  
  developers
  
  built on Oct 22 2013 12:31:55 with gcc 4.6.3
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release.
  
  Please use avconv instead.
  
  [oss @ 0x1ba57a0] /dev/dsp: No such file or directory
  
  /dev/dsp: Input/output error

  I haven’t been able to get ffmpeg to find my microphone. How can I tell ffmpeg to record from my microphone ?
  It seems the ’Deprecated’ message can be ignored because of this topic

• Unrecognized option 'preset' with ubuntu 12.04 and ffmpeg

  5 novembre 2013, par hyperrjas

  I have compiled ffmpeg with the guide How To Compile FFmpeg and x264 on Ubuntu.

  Now I'm trying upload a .mp4 file to encode. However I get this error now :

  ffmpeg version git-2013-11-05-934e489 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Nov  5 2013 13:58:43 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --enable-gpl --enable-libass --enable-libfaac --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-x11grab --enable-nonfree --enable-version3
  
    libavutil      52. 51.100 / 52. 51.100
  
    libavcodec     55. 41.100 / 55. 41.100
  
    libavformat    55. 21.100 / 55. 21.100
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.101 /  3. 90.101
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Unrecognized option 'preset'.
  
  Error splitting the argument list: Option not found
  
  
  
  Errors: no output file created.

  This is the ruby methods to encode :

  case format
  
    when 'mp4'
  
     h[:video_codec] = 'libx264'
  
     h[:audio_codec] = 'libfaac'
  
     h[:custom] = '-qscale 0 -preset slow -g 30'
  
    when 'ogv'
  
     h[:video_codec] = 'libtheora'
  
     h[:audio_codec] = 'libvorbis'
  
     h[:custom] = '-b 1500k -ab 160000 -g 30'
  
    when 'webm'
  
     h[:video_codec] = 'libvpx'
  
     h[:audio_codec] = 'libvorbis'
  
     h[:custom] = '-b 1500k -ab 160000 -f webm -g 30'
  
  end

• Can't preserve metadata in ffmpeg video conversion

  30 avril 2017, par sakovias

  I would like to preserve the creation time metadata when I convert videos using ffmpeg/avconv. Here is the file I’m trying to convert :

  $ ffmpeg -i in.avi 
  
  ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Apr  2 2013 17:00:59 with gcc 4.6.3
  
  Input #0, avi, from 'in.avi':
  
    Metadata:
  
      creation_time   : 2013-08-12 06:59:14
  
      encoder         : CanonMVI06
  
    Duration: 00:00:12.26, start: 0.000000, bitrate: 14549 kb/s
  
      Stream #0.0: Video: mjpeg, yuvj422p, 640x480, 30 tbr, 30 tbn, 30 tbc
  
      Stream #0.1: Audio: pcm_u8, 11024 Hz, 1 channels, u8, 88 kb/s

  In the first approach I run

  $ ffmpeg -i in.avi -vcodec libx264 -acodec libmp3lame -r 30 -map_metadata 0 out.avi

  and get an output file which doesn’t have the ’creation_date’ metadata that I’d like to keep :

  $ ffmpeg -i out.avi 
  
  ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Apr  2 2013 17:00:59 with gcc 4.6.3
  
  [avi @ 0x83ba260] max_analyze_duration reached
  
  Input #0, avi, from 'out.avi':
  
    Metadata:
  
      encoder         : Lavf53.21.1
  
    Duration: 00:00:12.38, start: 0.000000, bitrate: 704 kb/s
  
      Stream #0.0: Video: h264 (Main), yuv420p, 640x480, 30 fps, 30 tbr, 30 tbn, 60 tbc
  
      Stream #0.1: Audio: mp3, 11025 Hz, mono, s16, 200 kb/s

  I also tried another approach

  $ ffmpeg -i in.avi -f ffmetadata metadata.txt
  
  $ ffmpeg -i in.avi -f ffmetadata -i metadata.txt -vcodec libx264 -acodec libmp3lame -r 30 out.avi

  with the same success even though metadata.txt has the right info :

  ;FFMETADATA1
  
  creation_time=2013-08-12 06:59:14
  
  encoder=CanonMVI06

  What am I doing wrong ?