#1258: Codec support request : MPEG Multichannel Audio
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Reporter: aquarat | Type:
Status: new | enhancement
Component: FFmpeg | Priority: normal
Keywords: mpeg | Version:
mctoolame multichannel | unspecified
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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Hi
Support for MPEG Multichannel audio seems to be missing. This is different
to ac3. More information can be found here :
http://en.wikipedia.org/wiki/MPEG_Multichannel
It's a method of encoding surround audio into stereo mpeg2 files. If the
files are played back using software that doesn't support the extra
channels, the data is dropped and only the first two channels are decoded.
This codec forms part of the HDV specification (specifically the 4 channel
audio option on some HDV camcorders). The Canon XLH1, in particular, made
use of this system.
I have found a very old project called mctoolamed :
http://mctoolame.sourceforge.net which can decode this codec.
mctoolamed has several issues; it doesn't make provision for sample rates
other than 44.1kHz and it also only supports 2,6 and 8 channel files (HDV
cameras shoot 4 channels).
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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1258>
FFmpeg <http://ffmpeg.org>
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