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• How to use ffmpeg to mix two audio files to a single one ?

  18 mars 2014, par Dead Live

  I want to mix two audio files to a single one use ffmpeg. So I download the latest version of ffmpeg, and check the document and get the code :

  ffmpeg -i 10001.wav -i 201.wav -filter_complex amix=inputs=2:duration=shortest output.wav

  but I got this error :

  ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Aug  9 2012 16:22:59 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)
  
    configuration: --prefix=/usr/ --enable-gpl --enable-libx264 --enable-libmp3lame
  
    libavutil      51. 54.100 / 51. 54.100
  
    libavcodec     54. 23.100 / 54. 23.100
  
    libavformat    54.  6.100 / 54.  6.100
  
    libavdevice    54.  0.100 / 54.  0.100
  
    libavfilter     2. 77.100 /  2. 77.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  [wav @ 0x13d08100] max_analyze_duration 5000000 reached at 5120000
  
  Guessed Channel Layout for  Input Stream #0.0 : mono
  
  Input #0, wav, from '10001.wav':
  
    Duration: 00:00:07.91, bitrate: 64 kb/s
  
      Stream #0:0: Audio: pcm_alaw ([6][0][0][0] / 0x0006), 8000 Hz, mono, s16, 64 kb/s
  
  [wav @ 0x13d08980] max_analyze_duration 5000000 reached at 5120000
  
  Guessed Channel Layout for  Input Stream #1.0 : mono
  
  Input #1, wav, from '201.wav':
  
    Duration: 00:00:11.88, bitrate: 128 kb/s
  
      Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 8000 Hz, mono, s16, 128 kb/s
  
  [abuffersink @ 0x13d268c0] No opaque field provided, an AVABufferSinkParams struct is required

  Can anyone can help me ? Thanks !

• Decode mp4 to raw frames windows c++

  27 septembre 2012, par p.streef

  I'm trying to decode an MP4 file i've created using mp4creator library. I can't find a ffmpeg or libav example that actually works with the libraries, because the code is incompatible with the examples.

  I need a simple way of reading the mp4 file and decoding it into raw audio and video frames. In needs to work on windows too.

  If someone can point me towards a working and compatible ffmpeg/libav library + example source file that could work too.

  If i could get the library version which was used in this tutorial that would work, since this guy seems to be the only one who wrote a decent tutorial on FFMPEG (albeit on some ancient version)
  http://dranger.com/ffmpeg/

  edit :

  In the latest version of ffmpeg i found the example named : filtering_video.c
  using a patch found : http://ffmpeg.org/pipermail/ffmpeg-devel/2012-June/126587.html I have gotten the program to do "something" It looks to be working so I will investigate further.

• FFMPEG Segmenting skips when m3u8 changes file

  25 septembre 2012, par user792164

  I am attempting to segment a large video file in to segments. When streamed (even locally) by opening the m3u8 file it will jump forward in time by some period of time less than 1 second.

  The following commands are executed :

  First mp4 —> ts :

  ffmpeg -i input_file.mp4 -bsf:v h264_mp4toannexb -acodec libfaac -vcodec libx264 -f mpegts -threads 0 output.ts

  Then I split using :

  ffmpeg -i output.ts -vcodec copy -acodec copy -map 0 -f segment -segment_time 30 -segment_list output.m3u8 -segment_list_type m3u8 -segment_format mpegts output%03d.ts 

  Note : Changing segment time has no effect on issue.

  Generated manifest :

  #EXTM3U
  
  #EXT-X-VERSION:4
  
  #EXTINF:30.947578,
  
  output000.ts
  
  #EXTINF:30.155111,
  
  output001.ts
  
  ...
  
  #EXTINF:24.023989,
  
  output082.ts
  
  #EXT-X-TARGETDURATION:37
  
  #EXT-X-ENDLIST

  ---

  Meta Data :

  $> ffmpeg -version
  
  ffmpeg version git-2012-08-19-a93c221
  
  built on Aug 19 2012 13:18:58 with gcc 4.4.5 (Debian 4.4.5-8)
  
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib/ --mandir=/usr/share/man --extra-cflags='-O3 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions \ -fstack-protector --param=ssp-buffer-size=4 -mtune=generic' --enable-gpl --enable-shared --enable-nonfree --enable-version3 --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-pthreads --enable-libxvid --enable-postproc --enable-libgsm --enable-libspeex --enable-avfilter --disable-decoder=libdirac --enable-libfreetype --enable-libschroedinger --disable-decoder=libschroedinger --enable-libopenjpeg --disable-ffplay --disable-ffserver
  
  libavutil      51. 70.100 / 51. 70.100
  
  libavcodec     54. 53.100 / 54. 53.100
  
  libavformat    54. 25.104 / 54. 25.104
  
  libavdevice    54.  2.100 / 54.  2.100
  
  libavfilter     3. 11.101 /  3. 11.101
  
  libswscale      2.  1.101 /  2.  1.101
  
  libswresample   0. 15.100 /  0. 15.100
  
  libpostproc    52.  0.100 / 52.  0.100

  -

  $> ffprobe input_file.mp4
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input_file.mp4':
  
  Metadata:
  
  major_brand     : isom
  
  minor_version   : 1
  
  compatible_brands: isom
  
  creation_time   : 2011-09-08 11:43:25
  
  Duration: 00:41:31.00, start: 0.000000, bitrate: 1146 kb/s
  
  Stream #0.0(und): Video: h264 (High), yuv420p, 720x404 [PAR 1:1 DAR 180:101], 1015 kb/s,    23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc
  
  Metadata:
  
    creation_time   : 2011-09-08 11:43:25
  
  Stream #0.1(und): Audio: aac, 48000 Hz, stereo, s16, 124 kb/s
  
  Metadata:
  
    creation_time   : 2011-09-08 11:43:25

  -

  $> ffprobe output_file.ts
  
  Input #0, mpegts, from 'output_file.ts':
  
  Duration: 00:41:30.98, start: 1.400000, bitrate: 807 kb/s
  
  Program 1 
  
  Metadata:
  
    service_name    : Service01
  
    service_provider: FFmpeg
  
  Stream #0.0[0x100]: Video: h264 (High), yuv420p, 720x404 [PAR 1:1 DAR 180:101], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
  
  Stream #0.1[0x101](und): Audio: aac, 48000 Hz, stereo, s16, 141 kb/

  ---

  Is it possible to remove this jump, if so, what encoding parameters or incorrect assumptions have I made ? Thanks.