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• How to decode mp4a-latm content in RTP using ffmpeg ?

  13 avril 2012, par Nitin Goyal

  I am trying to decode the mp4a-latm content using ffmpeg. I have used the CodecID as Codec_ID_AAC_LATM and extracted the config parameter from the SDP and further extracted the audio content from the RTP by removing the rtp header and sent it to decodeAudio4 function but the decode function always return the negative value.

  I have gone through the RFC 3016 and the code of rtpdec_latm.c in ffmpeg src also but i am not able to find where i am doing the mistake and what exactly the procedure to send the content to decode.

  As general, we need to send the config value frm SDP and then the raw audio packet form the RTP after removing the header but its not working.

  Can someone help me in it ?

  Regards
  Nitin

• Running ffmpeg from a windows service on same machine encounters permissions issue

  8 mars 2012, par gaijintendo

  I had been running a Windows Service, form my machine (which has full read/write access to a network drive).

  The command for ffmpeg was something like this :
   i \filestore\test.avi -b 500000 -s 640x360 -ar 22050 -copyts -y -vcodec libx264 -acodec ac3 -y \filestore\mp4\test.mp4

  Running it from cmd works perfectly. Running it from a windows service, from the same machine, would yield a File Not found type error. Updating to the latest ffmpeg stable changed that to "Permission denied".

  I am running the service it as 'Local Account'. I was intending to run this on another server, so I need to get a grip on this !

  Does running a service on your machine run as a different user to you when you choose 'Local Account' ?

• FFMPEG conversion to MXF [closed]

  16 février 2012, par MFB

  I have to wrap an MPEG2 video file in an MXF container and convert the audio in the process. I have the MXF wrapping working but it won't convert the audio stream (which needs to be 16bit, 48kHz Linear PCM).

  Here's what I'm trying :

  ffmpeg -i input.mpg -map 0:0 -map 0:1 -vcodec copy -f mpeg2video -acodec pcm_s16le -ar 48000 -ac 2 output.mxf

  Results :

  ffmpeg version 0.10 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Jan 30 2012 17:49:23 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
  
    configuration: *{snipped}*
  
  runtime-cpudetect
  
    libavutil      51. 34.101 / 51. 34.101
  
    libavcodec     53. 60.100 / 53. 60.100
  
    libavformat    53. 31.100 / 53. 31.100
  
    libavdevice    53.  4.100 / 53.  4.100
  
    libavfilter     2. 60.100 /  2. 60.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0.  6.100 /  0.  6.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  [mpeg @ 0x10201ae00] max_analyze_duration 5000000 reached at 5000000
  
  Input #0, mpeg, from '/Volumes/Extra/test.mpg':
  
    Duration: 00:00:59.97, start: 0.192911, bitrate: 6513 kb/s
  
      Stream #0:0[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s
  
      Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 16:15 DAR 4:3], 12000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  Output #0, mpeg2video, to 'video.mxf':
  
    Metadata:
  
      encoder         : Lavf53.31.100
  
      Stream #0:0: Video: mpeg2video, yuv420p, 720x576 [SAR 16:15 DAR 4:3], q=2-31, 12000 kb/s, 25 fps, 90k tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  frame= 1500 fps=  0 q=-1.0 Lsize=   43949kB time=00:00:59.96 bitrate=6004.6kbits/s    
  
  video:43949kB audio:0kB global headers:0kB muxing overhead 0.000000%

  The video plays fine as the MXF, but there is no audio stream at all. Any help would be great.