#2099: FFMPEG Does not allow TrueHD, DTS-Master Audio or DTS in .M4V even though
format supports it
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Reporter: JohnGalt | Owner:
Type: enhancement | Status: closed
Priority: wish | Component: avformat
Version: git-master | Resolution:
Keywords: mov dca thd | needs_more_info
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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Comment (by JohnGalt):
Take the sample from above that is an m2ts file. Load it into handbreak,
and under audio, tell it to create an audio track with True HD
passthrough. Set it to mp4 and large and web optimized. (it will create an
m4v). Feel free to create a secondary ac3 downmix track as well so that
there are 2 audio tracks in the file.
Let it encode.
Open up VLC and play the file. The audio tracks will both be listed. If
you have a compatible audio receiver hooked up via HDMI or Displayport it
will bitstream the truehd track directly to the receiver without issue and
the receiver will decode it. On anything else, the secondary ac3 track
will work just fine.
Again, TrueHD is not certified on any software to be decoded. NONE. TrueHD
can be bitstreamed to Digital receivers via HDMI or DisplayPort only, and
the receiver that your computer his hooked into will decode it. (even
Blueray software cannot decode TrueHD or DTS-MA, they can only bitstream
the tracks to a receiver that can)
This works exactly the same way as MKV, and since there is no Dolby
certified playback software for MKVs and yet you support MKVs with TrueHD
audio tracks that bitstream, there should be no reason why you don't with
mp4s. (Same goes for DTS-HD since both are supported by the standard)
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2099#comment:45>
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