Am 11.11.22 um 14:05 schrieb Jan Ekström:
On Wed, Nov 9, 2022 at 9:15 PM Nomis101 <nomis...@web.de> wrote:
Am 06.11.22 um 21:57 schrieb Carl Eugen Hoyos:
Am Sa., 5. Nov. 2022 um 22:31 Uhr schrieb Nomis101 <nomis...@web.de>:
Support for mlpa muxing was added back in 2019:
http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=808a6717e0c584738c60a109afd6d47f4973d619
But it was hidden back then behind FF_COMPLIANCE_EXPERIMENTAL, because it was
new and there was no
support from other applications.
In the meantime there is support in MediaInfo: MediaArea/MediaInfoLib#1258
For VLC: videolan/vlc@9c49f40
Since version 7.3.4 for Infuse:
https://community.firecore.com/t/dolby-mlp-mlpa-codec-support/26100/31
And mpv does support this as well.
If there was ever a good reason to make this feature experimental,
I don't think these applications change the situation.
The reason to make this experimental was, because there was no implementation
from others at this time.
http://ffmpeg.org/pipermail/ffmpeg-devel/2019-August/248435.html
Now, there is implementation from others. How many implementation from others
will be needed to
change the situation?
I think the main thing was to have the feature verified by non-FFmpeg
things. Basically, if you wrote out a TrueHD file and actual 3rd party
implementations that didn't just utilize FFmpeg for reading would
happily read it, then the flag should be removed.
If the VLC commit did not specifically say "we did it like this to
enable support for files that FFmpeg generated" but rather that they
followed the spec, then that's one alternative implementation indeed.
And if MediaInfo or that Infuse thing also added support for the exact
same mapping and that neither specifically utilized FFmpeg internally,
then those also apply.
Finally, I think the D company has a git repo for "dlb_mp4base", you
could check if that supports this mapping.
Best regards,
Jan
OK, thanks Jan for the detailed explanation. I will check D company. Infuse has implemented it
independently of FFmpeg. VLC and Mediainfo I do not know. The specs were mentioned in the bug, but
also FFmpeg. But both would not implement anything if there was no specification for it.
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