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• Improve the quality of webm video using ffmpeg

  3 octobre 2013, par Leke

  I'm trying out two codecs and was wondering if I could improve the results of the webm output ...

  ffmpeg -i test.ts -t 10 -f webm -vcodec libvpx output.webm

  to match the quality of the mp4 output...

  ffmpeg -i test.ts -t 10 -b 1500k -vcodec libx264 output.mp4

  What settings would give me the best webm rip ?

  Thanks.

  Edit :
  Here is an error output when trying some rip improvements...

  ffmpeg -i test.ts -c:v libvpx -crf 4 -b:v 1M -c:a libvorbis output.webm
  
  
  
  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
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  [mpeg2video @ 0x9cde5c0] mpeg_decode_postinit() failure
  
      Last message repeated 4 times
  
  [mpegts @ 0x9cda240] max_analyze_duration reached
  
  [mpegts @ 0x9cda240] PES packet size mismatch
  
  Input #0, mpegts, from 'test.ts':
  
    Duration: 00:03:59.53, start: 4630.845422, bitrate: 1977 kb/s
  
      Stream #0.0[0x20b]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 64:45 DAR 16:9], 15000 kb/s, 25.60 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0.1[0x28f]: Audio: mp2, 48000 Hz, stereo, s16, 224 kb/s
  
  
  
  Unrecognized option 'c:v'
  
  Failed to set value 'libvpx' for option 'c:v'

• ffmpeg not finding audio streams ?

  24 septembre 2013, par Jim Miller

  I'm doing some video conversion with ffmpeg v. N-54271-g7f866c1 (a fresh pull from the git sources in late June 2013) on Fedora 19. One of the things I want to do is to concatenate two videos and then convert the result to an mp4. The following code is working well for me :

  ffmpeg -i video_a.mov -i video_b.mov -acodec libfaac -vcodec libx264 
  
       -preset fast -crf 22  -s 940x528 -pix_fmt yuv420p 
  
       -filter_complex '[0:1] [0:0] [1:1] [1:0]  concat=n=2:v=1:a=1 [v] [a]' 
  
       -map '[v]' -map '[a]' output.mp4

  except for a couple of older hunks of test video I've been using. On those, ffmpeg isn't finding the audio stream, and so the above call dies with ffmpeg complaining that Stream specifier ':1' in filtergraph description [0:1][0:0][1:1][1:0] concat=n=2:v=1:a=1 [v] [a] matches no streams. The catch, of course, is that there is an audio stream in the video ; it's just not getting found.

  When ffmpeg starts, I get a description of the input like so :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/priv/videorising7/raw_take_video/v2261-MTQxMzgwMDM4NzAx.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2011-10-13 16:08:18
  
    Duration: 00:00:25.52, start: 0.000000, bitrate: 49 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 608x342, 47 kb/s, 10.03 fps, 10 tbr, 1k tbn, 2k tbc
  
      Metadata:
  
        creation_time   : 2011-10-13 16:08:18
  
        handler_name    : Apple Alias Data Handler

  I suppose the video might just be so old (2006 ?) that I should be lucky that it plays at all. However, I'm able to run these videos through some other ffmpeg jobs (converting from .mov to .mp4, for instance), but those don't require explicitly referencing the audio and video tracks. Any insights out there ?

• FFMPEG Detect volume of streaming (PHP)

  22 septembre 2013, par Mohamed Mostafa

  I spent last 4 days trying to acheive that but with no luck,

  I am trying to detect volume of streaming link or save audio file, using the FFmpeg I tried every single command line.

  ffmpeg -f lavfi -i amovie=sample1.aac,volumedetect -f null -y test.txt

  Output

  There was a problem! Array (
  
      [0] => FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
  
      [1] => built on Jan 29 2012 17:52:15 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6)
  
      [2] => configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-avfilter-lavf --enable-libdc1394 --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
  
      [3] => libavutil 50.15. 1 / 50.15. 1
  
      [4] => libavcodec 52.72. 2 / 52.72. 2
  
      [5] => libavformat 52.64. 2 / 52.64. 2
  
      [6] => libavdevice 52. 2. 0 / 52. 2. 0
  
      [7] => libavfilter 1.19. 0 / 1.19. 0
  
      [8] => libswscale 0.11. 0 / 0.11. 0
  
      [9] => libpostproc 51. 2. 0 / 51. 2. 0
  
      [10] => Unknown input format: 'lavf'
  
  )

  Basically my problem now is :

   Unknown input format: 'lavf'

  Any help please

  My FFMpeg Version is

  [root@bea ~]# ffmpeg -formats | grep lavfi

  FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
  built on Jan 29 2012 17:52:15 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6)
  configuration : —prefix=/usr —libdir=/usr/lib64 —shlibdir=/usr/lib64 —mandir=/usr/share/man —incdir=/usr/include —disable-avisynth —extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector —param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' —enable-avfilter —enable-avfilter-lavf —enable-libdc1394 —enable-libdirac —enable-libfaac —enable-libfaad —enable-libfaadbin —enable-libgsm —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-librtmp —enable-libschroedinger —enable-libspeex —enable-libtheora —enable-libx264 —enable-gpl —enable-nonfree —enable-postproc —enable-pthreads —enable-shared —enable-swscale —enable-vdpau —enable-version3 —enable-x11grab
  libavutil 50.15. 1 / 50.15. 1
  libavcodec 52.72. 2 / 52.72. 2
  libavformat 52.64. 2 / 52.64. 2
  libavdevice 52. 2. 0 / 52. 2. 0
  libavfilter 1.19. 0 / 1.19. 0
  libswscale 0.11. 0 / 0.11. 0
  libpostproc 51. 2. 0 / 51. 2. 0

  From PHP info

  ffmpeg

  ffmpeg-php version 0.6.0-svn
  ffmpeg-php built on Sep 21 2013 15:38:20
  ffmpeg-php gd support enabled
  ffmpeg libavcodec version Lavc52.72.2
  ffmpeg libavformat version Lavf52.64.2
  ffmpeg swscaler version SwS0.11.0

  Directive Local Value Master Value
  ffmpeg.allow_persistent 0 0
  ffmpeg.show_warnings 0 0