[FFmpeg-trac] #8349(undetermined:open): Dolby AC-4 Support

[FFmpeg]

#8349: Dolby AC-4 Support
-------------------------------------+-------------------------------------
             Reporter:  Nomis101     |                    Owner:
                 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 ferrellsl):

 Replying to [comment:34 LostDog]:
 > Replying to [comment:33 ferrellsl]:
 > > Let us know if you're successful.  I'd really like to have a PVR that
 records and plays ATSC3.0 streams without using a bunch of scripts and
 hacks.  Over at the NextPVR forums there's a guy who has written some
 python scripts that use the binaries from this tree to transcode the
 ATSC3.0/AC4 audio stream into AC3 on-the-fly but I'm hoping for a cleaner
 solution.
 > >
 > > For now, I can still record my ATSC3.0 channels using NextPVR and use
 the binaries from this tree for playback of those ATSC3.0 recordings
 without transcoding, and of course all the 4K channels in the Phoenix area
 are mirrored in 1080p/ATSC1.0 channels. I'm quite pleased with richardpl's
 progress.  I was expecting things to move much slower than they have, or
 not at all.  At least now I have a poor-man's PVR using scripts for
 playback.  Having AC4 integrated natively into VLC, Kodi, or NextPVR would
 be very welcome from my standpoint.
 > >
 > >
 >
 > I have successfully built Kodi v18.9 against the AC-4 branch of ffmpeg.
 ATSC3.0 captures work seemingly flawlessly with audio.  I cannot verify if
 it's 5.1 and the channels are correct but on my computer with stereo
 headphones the audio sounds great.
 >
 > Tuning live ATSC3.0 is really buggy using the HDHomerun plugins but it
 will occasionally play and when it does there is audio.  I don't think
 this has anything to do with ffmpeg but rather the plugins themselves.

 Wow, you've been really busy!  I took a look at the VLC sources tonight
 and will attempt to build it against the AC-4 branch this week since I'm
 feeling brave. I noticed that in the rules.mak file located under
 vlc/contrib/src/ffmpeg/ that it's referencing the trunk sources.  Is it
 enough to edit the rules.mak file in this directory to point towards the
 AC-4 branch and then attempt a build? Here's the portion of rules.mak that
 references the ffmpeg trunk.  I'm hoping it would be that simple but
 that's usually never the case.

 # FFmpeg

 #Uncomment the one you want
 #USE_LIBAV ?= 1
 #USE_FFMPEG ?= 1

 ifndef USE_LIBAV
 FFMPEG_HASH=1e35519fe0b8bbad84641e83d49138152720b544
 FFMPEG_GITURL := http://git.videolan.org/git/ffmpeg.git
 FFMPEG_LAVC_MIN := 57.37.100
 USE_FFMPEG := 1
 else
 FFMPEG_HASH=e5afa1b556542fd7a52a0a9b409c80f2e6e1e9bb
 FFMPEG_GITURL := git://git.libav.org/libav.git
 FFMPEG_LAVC_MIN := 57.16.0
 endif

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8349#comment:35>
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