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• ffmpeg : convert audio-only flv to swf

  5 octobre 2011, par Michael Brewer-Davis

  My Flex application records audio-only FLV files using red5—I'd like to convert these to SWF files so I can embed them in other SWF files. (I could also convert to MP3 and then embed them into SWFs myself, but I'd prefer a one step solution.)

  Anyone have experience doing this ?

  What I've tried :

  The following naive ffmpeg command fails :

  > ffmpeg -i 3139747641.flv -vn movie.swf
  
  FFmpeg version SVN-r21751-snapshot, Copyright (c) 2000-2010 Fabrice Bellard, et al.
  
    built on Feb 11 2010 09:15:42 with gcc 4.2.1 (SUSE Linux)
  
    configuration: --enable-gpl --enable-nonfree
  
    libavutil     50. 9. 0 / 50. 9. 0
  
    libavcodec    52.53. 0 / 52.53. 0
  
    libavformat   52.52. 0 / 52.52. 0
  
    libavdevice   52. 2. 0 / 52. 2. 0
  
    libswscale     0.10. 0 /  0.10. 0
  
  [flv @ 0x8a5e3a0]Could not find codec parameters (Video: 0x0000)
  
  [flv @ 0x8a5e3a0]Estimating duration from bitrate, this may be inaccurate
  
  Input #0, flv, from '3139747641.flv':
  
    Metadata:
  
      audiocodecid    : -1
  
      duration        : 0
  
      videocodecid    : -1
  
      canSeekToEnd    : true
  
    Duration: 00:00:14.88, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: 0x0000, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: nellymoser, 8000 Hz, mono, s16
  
  Output #0, swf, to 'movie.swf':
  
      Stream #0.0: Audio: 0x0000, 8000 Hz, mono, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
  Encoder (codec id 86017) not found for output stream #0.0

  I've tried adding a dummy video, but this also failed :

  > ffmpeg -i dummy.mov -i 3139747641.flv movie.swf
  
      
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'dummy.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 512
  
      compatible_brands: qt  
  
      encoder         : Lavf52.52.0
  
      encoder-eng     : Lavf52.52.0
  
    Duration: 00:00:00.10, start: 0.000000, bitrate: 62 kb/s
  
      Stream #0.0(eng): Video: mpeg4, yuv420p, 10x10 [PAR 1:1 DAR 1:1], 1 kb/s, 10 fps, 10 tbr, 10 tbn, 10 tbc
  
  [flv @ 0x8a67fa0]Could not find codec parameters (Video: 0x0000)
  
  [flv @ 0x8a67fa0]Estimating duration from bitrate, this may be inaccurate
  
  Input #1, flv, from '3139747641.flv':
  
    Metadata:
  
      audiocodecid    : -1
  
      duration        : 0
  
      videocodecid    : -1
  
      canSeekToEnd    : true
  
    Duration: 00:00:14.88, start: 0.000000, bitrate: N/A
  
      Stream #1.0: Video: 0x0000, 1k tbr, 1k tbn, 1k tbc
  
      Stream #1.1: Audio: nellymoser, 8000 Hz, mono, s16
  
  picture size invalid (0x0)
  
  Cannot allocate temp picture, check pix fmt

• FFMpeg API Write AVPackets to new H264 file without Decoding / Transcoding

  15 septembre 2011, par mhathcock

  Using the FFMpeg API in Windows 7 64bit with MSVC++ 2010 :

  Using video files in MP4 container, with Video in H264 and Audio in AAC.

  I can successfullly read packets, decode them, encode them, and write them back to a video file using the normal av_read_frame, avcodec_decode_video, etc.

  What i want to do is read a packet, and write it to the output file immediately, without encoding or decoding. Essentially, to be able to take packets from different video files (that are all identical size, bitrate, fps, etc) and write them into 1 video file.

  I set the packet PTS and DTS to the number of written packets.

  Libx264 does not complain during this process, but the output video file contains no data (headers only ?) and is less than 50kB, and claims a duration of 0.

  Code :

  while( readVal > -1 )
  
  {
  
    readVal = av_read_frame( pFormat, &pkt );
  
  
  
    if ( pkt.stream_index == vidIdx )
  
    {
  
      pkt.pts = packets;
  
      pkt.dts = packets;
  
  
  
      pkt.stream_index = pVideoStream->index;
  
  
  
      av_write_frame( pFmtOut, &pkt );
  
  
  
      printf("Processing packet %i\n", packets );
  
  
  
      ++packets;
  
    } 
  
  }

• ffmpeg reencoding of flv files from MAC

  22 septembre 2011, par Nick Mitin

  I've recorded a video from a webcam on mac and now i'm trying to reencode it, but ffmpeg does not recognize audio stream :

  FFmpeg version git-120610e, Copyright (c) 2000-2010 the FFmpeg developers
    built on Sep 21 2010 15:56:57 with gcc 4.4.1
    configuration : —enable-gpl —enable-version3 —enable-nonfree —enable-postproc —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libtheora —enable-libvorbis —enable-libmp3lame —enable-libx264
    libavutil     50.27. 0 / 50.27. 0
    libavcore      0. 9. 0 /  0. 9. 0
    libavcodec    52.89. 0 / 52.89. 0
    libavformat   52.78. 5 / 52.78. 5
    libavdevice   52. 2. 2 / 52. 2. 2
    libavfilter    1.39. 0 /  1.39. 0
    libswscale     0.11. 0 /  0.11. 0
    libpostproc   51. 2. 0 / 51. 2. 0
  [flv @ 0x1e79470] Estimating duration from bitrate, this may be inaccurate
  Input #0, flv, from '10125174c09241f6536ccbe503ebbc00.flv' :
    Duration : 00:00:22.68, start : 0.000000, bitrate : N/A
      Stream #0.0 : Video : flv, yuv420p, 640x480, 1k tbr, 1k tbn, 1k tbc
      Stream #0.1 : Audio : [0][0][0][0] / 0x0000, 0 channels
  

  Is it possible to make ffmpeg to support audio stream form flv recorded on MAC ?