[FFmpeg-trac] #4441(undetermined:new): support HDCD

[FFmpeg]

#4441: support HDCD
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             Reporter:  calestyo     |                     Type:
               Status:  new          |  enhancement
            Component:               |                 Priority:  wish
  undetermined                       |                  Version:
             Keywords:               |  unspecified
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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 Hey.

 (Thought I'd have reported that here before, but I cannot find the ticket
 anymore)

 AFAICS, ffmpeg does not support HDCD content (i.e. CD-DAs that use that
 encoding or WAVs extracted from such CD-DAs and in which the necessary
 data should still be present).

 Even though HDCD is a dead format now (well more or less, according to
 some source there are allegedly still up to 4k titles available... not
 much) it would be nice if a decoder could be added, since people have CDs
 respectively rips thereof in this format and it would be nice if they have
 a way to listen to it even in 20 years or so.

 Apparently there is source code for a decoder available under an open
 source license, so that might be taken and adapted as necessary:
 https://github.com/kode54/foo_hdcd


 Many information about HDCDs is floating around the web, e.g.:
 https://forum.dbpoweramp.com/showthread.php?27540-Ripping-HDCDs-Best-
 practices

 In any case note, that HDCD doesn't only apply to CDs (as mentioned
 above).
 Further, it's apparently the case there are several features in HDCD (some
 of this is explained above) and that just the stream indicator for "HDCD
 encoding present" alone doesn't tell much...
 Also it and the features as well can vary from track to track.


 Best wishes,
 Chris.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4441>
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