[FFmpeg-trac] #8349(undetermined:open): Dolby AC-4 Support
FFmpeg
trac at avcodec.org
Sat Oct 16 09:22:42 EEST 2021
#8349: Dolby AC-4 Support
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Reporter: Nomis101 | Owner: (none)
Type: enhancement | Status: open
Priority: wish | Component:
| undetermined
Version: git-master | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Nicholas S Jenkins):
Replying to [comment:14 Elon Musk]:
> Looks like nobody cares about AC-4, because if they care they would
actually provide AC-4 samples here.
I realize this post is quite dated now; but I wanted to highlight that for
people with HDHomeRun Connect 4K devices (and I assume successor Flex
devices) that there is a trivially easy way for people in ATSC3.0
broadcast areas to capture raw feeds for testing with:
https://info.hdhomerun.com/info/troubleshooting:creating_a_sample
remember that ATSC3.0 stations are presented by HDHR as 100+channel
number, so for me (picking up Cincinnati), 105.1, 109.1, 112.1, etc.
Example curl command:
curl http://192.168.0.37:5004/auto/v112.1?duration=120 >
../test_capture_of_112_1.ts
This capture avoids automatic transcoding by ffmpeg/ffmpeg-derived tools
that will otherwise try to demux/remux and decode/encode broadcast formats
(e.g. HEVC/AC-4) into assumed-preferred formats (e.g. MP2/H.264).
Since I'm now able to record off-air, I hope to help in testing + probably
code integration into head branch of ffmpeg.
On a related note... do you know why?:
1) The Richardpl fork indicates it's from an ffmpeg branch 3 years old,
and that can't be readily updated to current ffmpeg version (no big deal,
only ~dozen sources look related to AC-4, but just curious)
2) but this thread would suggest the code is only 10 months old? ... and
is there a separate discussion / real effort underway to integrate the
code into ffmpeg head? (I wouldn't want to duplicate effort, but rather
assist)
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8349#comment:54>
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