[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
             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            |
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:
 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 >
 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
Ticket URL: <https://trac.ffmpeg.org/ticket/8349#comment:54>
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