[FFmpeg-trac] #2865(avformat:new): Front Center, Downmix Left, and Downmix Right unlabelled in QTPlayer
FFmpeg
trac at avcodec.org
Thu Aug 22 00:09:50 CEST 2013
#2865: Front Center, Downmix Left, and Downmix Right unlabelled in QTPlayer
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Reporter: cjplay93 | Owner:
Type: enhancement | Status: new
Priority: wish | Component: avformat
Version: git-master | Resolution:
Keywords: chan | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by cehoyos):
Replying to [comment:2 cjplay93]:
> I only called it a defect as 5 of the 8 tracks were working so I thought
it was a bug.
I really understand that, the problem is that DL and DR were never
supported when writing the chan atom, adding support is relatively easy
for caf and aiff (which does not help you) but less easy for mov (if used
to be identical for mov and the other containers but was deliberately
broken at some point, it will be necessary to test if there is a hidden
feature in the brokenness that I so far didn't see or if the change can
simply be reverted).
Concerning FC vs "mono": FFmpeg cannot discern between them (mono and
center are the same in wav), are you only worried because QuickTime does
not show what you expect or is the output file effectively broken if you
produce six instead of eight channels?
> Anyway, the attached file is almost the same asset, but now with
QTPlayer's labelling included.
This is extremely useful, thank you!
> You'll see in QTPlayer's movie inspector as well when all 8 tracks are
turned on in Movie Properties. That's another weird thing about the LibAV
output is that the tracks are "turned off" upon output from FFMPEG.
I still believe that the typical use-case is to mux several languages into
one mov file and you don't want them to play simultaneously. But what you
ask is an often requested feature, help on this is welcome, initial tests
showed that we (or at least I) don't know how exactly to enable all
tracks. (But you could test older versions of FFmpeg.)
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2865#comment:3>
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