[FFmpeg-devel] Fwd: Help with codecs

[compn]

On Tue, 12 May 2015 17:16:51 +0200
Fernandon Bautista <fernandobautista017 at gmail.com> wrote:

> Dear all,
> 
> we have some audio files that we need to convert to WAVE audio,
> Microsoft PCM, 16 bit, mono 8000 Hz format. They are encoded in a
> proprietary software codec that it only runs on Windows. We need to
> process the audio decoding in Linux servers and thus we need to find
> an alternative.
> 
> Base on the provider, we expect the audios to be one of those codecs (
> http://www.shouldiremoveit.com/Verint-Multimedia-Support-Package-100067-program.aspx

hello! 

thank you for saying which package had the dll.

I was able to find it, and make a mirror here of the dll file required
http://samples.ffmpeg.org/drivers32/new/G729DecoderDMO.dll

I was then able to add it to mplayer project, by adding this to ~/.mplayer/codecs.conf:

audiocodec g729dmo
  info "verint g729"
  status working
  format 0x83
  format 0xA104 ;untested
  driver dmo
  dll "G729DecoderDMO.dll"
  guid 0xe1d97f0c, 0x47d0, 0x416b, 0x97, 0xc6, 0xcd, 0xf5, 0xdc, 0x30, 0xd6, 0xf4

mplayer can play your sample .wav file. but i only tested this on windows.

it might work in linux for you to convert your files with 32bit mplayer compiled with dmo/dshow win32 codec support. assuming you follow those steps (download dll file to a location mplayer looks for codecs (usually /usr/local/lib/codecs) and add that info to codecs.conf).

simply mplayer -ao pcm g729stereo.wav 

let me know if it works for you, this is an alternative until ffmpeg gets support for it.

-compn