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• ffmpeg audio conversion distorted - half rate

  6 novembre 2013, par user1688971

  I'm trying to convert an asf audio to mp3 using ffmpeg.
  But I have one specific audio that gets distorted in the middle and starts like if the person was talking in slow motion (at half rate).

  The command I'm using is :

  ffmpeg - i input.asf -ac 2 output.mp3

  I've tried a lot of options, but about the middle of the audio is when it fails.
  The raw file sounds good, so it's not the recording. It is af in the middle of the transmission the frame rate went down for some reason.

  Thanks all !

  [EDIT]

  I'm adding the console response after running the command as a suggestion from LordNeckbeard :

  [root@mynasserver home]# ffmpeg -i recording-8532-1.asf -ac 2 -ab 64k -ar 44100 recording-8532-ac2-ar44100.mp3
  
  FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
  
  built on Jan 29 2012 23:56:18 with gcc 4.1.2 20080704 (Red Hat 4.1.2-51)
  
  configuration: --prefix=/usr --libdir=/usr/lib --shlibdir=/usr/lib --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 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables' --enable-avfilter --enable-avfilter-lavf --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --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
  
  [flv @ 0x86a4850]max_analyze_duration reached
  
  [flv @ 0x86a4850]Estimating duration from bitrate, this may be inaccurate
  
  Input #0, flv, from 'recording-8532-1.asf':
  
  Metadata:
  
  source          : STW MediaProxy v3.3.7.19894
  
  Duration: 04:00:08.49, start: 0.000000, bitrate: N/A
  
  Stream #0.0: Audio: aac, 44100 Hz, 2 channels (FC), s16
  
  Output #0, mp3, to 'recording-8532-ac2-ar44100.mp3':
  
  Metadata:
  
  TSSE            : Lavf52.64.2
  
  Stream #0.0: Audio: libmp3lame, 44100 Hz, 2 channels, s16, 64 kb/s
  
  Stream mapping:
  
  Stream #0.0 -> #0.0
  
  Press [q] to stop encoding
  
  size=  150906kB time=19315.93 bitrate=  64.0kbits/s    
  
  video:0kB audio:150906kB global headers:0kB muxing overhead 0.000021%

  So from the data above, you can see the input file is about 4hrs. The output ends up being around 5 hrs 20 mins.

• Overlaying jpg onto Mp4 using -VF

  16 février 2013, par brux

  I am using the following command to overlay a jpg :

  ffmpeg -i in.mp4 -vf "movie=bb.png [movie] ; [in] [movie] overlay=0:0 [out]" -vcodec libx264 -acodec copy out.mp4

  This works as expected with the first file (listed below) but it doesnt work with the second file. There is no error when I try with the second file, rather is creates an unusually large file that would not open :

  File 1 :

  [me@me ~]$ ffmpeg -i 2013-02-08.mp4 
  
  ffmpeg version 1.0.git Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Jan 11 2013 00:12:08 with gcc 4.7.2 (GCC) 20120921 (Red Hat 4.7.2-2)
  
    configuration: 
  
    libavutil      52.  8.100 / 52.  8.100
  
    libavcodec     54. 74.100 / 54. 74.100
  
    libavformat    54. 37.100 / 54. 37.100
  
    libavdevice    54.  3.100 / 54.  3.100
  
    libavfilter     3. 23.101 /  3. 23.101
  
    libswscale      2.  1.102 /  2.  1.102
  
    libswresample   0. 17.101 /  0. 17.101
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2013-02-08.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 2013-02-08 20:31:49
  
      encoder         : Lavf53.24.0
  
    Duration: 00:00:03.20, start: 0.000000, bitrate: 1030 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x576 [SAR 1:1 DAR 5:4], 1247 kb/s, 8.08 fps, 7.50 tbr, 15 tbn, 15 tbc
  
      Metadata:
  
        creation_time   : 2013-02-08 20:31:49
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 8000 Hz, mono, s16, 12 kb/s
  
      Metadata:
  
        creation_time   : 2013-02-08 20:31:49
  
        handler_name    : SoundHandler
  
  At least one output file must be specified

  File 2

  [me@me ~]$ ffmpeg -i aq.mp4 
  
  ffmpeg version 1.0.git Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Jan 11 2013 00:12:08 with gcc 4.7.2 (GCC) 20120921 (Red Hat 4.7.2-2)
  
    configuration: 
  
    libavutil      52.  8.100 / 52.  8.100
  
    libavcodec     54. 74.100 / 54. 74.100
  
    libavformat    54. 37.100 / 54. 37.100
  
    libavdevice    54.  3.100 / 54.  3.100
  
    libavfilter     3. 23.101 /  3. 23.101
  
    libswscale      2.  1.102 /  2.  1.102
  
    libswresample   0. 17.101 /  0. 17.101
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'aq.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 2013-02-19 20:33:16
  
      encoder         : Lavf53.24.0
  
    Duration: 00:00:03.20, start: 0.000000, bitrate: 1394 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x576 [SAR 1:1 DAR 5:4], 1451 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc
  
      Metadata:
  
        creation_time   : 2013-02-19 20:33:16
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 8000 Hz, mono, s16, 12 kb/s
  
      Metadata:
  
        creation_time   : 2013-02-19 20:33:16
  
        handler_name    : SoundHandler
  
  At least one output file must be specified

  In case it is important I am capturing these videos with Android devices. The first mp4 file is created by a Nexus 7, the second (the file which wont overlay the image) is created using a HTC Desire.

• FFmpeg audio capturing from mic is not working properly

  5 mars 2013, par Thirumalai murugan

  I am using the ffmpeg-20130205-git-c2dd5a1-win64-static version, I am trying to capture the audio and video and send it to the FMS server, I have tried with the following code initially

  ffmpeg -r 25 -f dshow -i video="Logitech HD Pro Webcam C920":audio="Rear Input (SoundMAX Integrated Digital High Definition Audio)" -vcodec libx264 -b:v 600k -b:a 128k -f flv rtmp://127.0.0.1/live/mystream

  it through the following error

  [dshow @ 00000000023f8920] Could not find audio device.
  
  video=Logitech HD Pro Webcam C920:audio=SoundMAX Integrated Digital High Definit
  
  ion Audio): Input/output error

  Then I modified the code as follows its working fine

  ffmpeg -f dshow -i video="Logitech HD Pro Webcam C920":audio="Rear Input (SoundMAX Integrated" -b:v 600k -acodec libmp3lame -b:a 128k -f flv rtmp://127.0.0.1/live/mystream

  I am unable to understand why its not accepting the full name of the audio driver and if I use the libx264 with the Logitech HD Pro Webcam C920 its not giving the video, video is blank (note : while using the iball c2.0 camera I am able to get the video)

  what is the wrong in my code ? how to publish in the libx264 format ?