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+---- Thread: v19 Ac4 sound support (/showthread.php?tid=358104)
Ac4 sound support - giaur - 2020-11-01
Afaik ffmpeg is not willing to add ac4 sound support anytime soon. DVB-T2 broadcasting in my country (but I guess, that's wordwide trend) includes ac4 audio and Kodi does not support it.
Is there any chance Kodi will support ac4?
RE: Ac4 sound support - pkscout - 2020-11-01
Given that the last Matrix Alpha was just released and we are (as far as I know) not adding any new features for Matrix any longer (the beta cycle will be bug fix only), I think it's safe to say there will be no AC4 support in Matrix. Whether there will be AC4 support in Version 20 is not a question I can answer.
RE: Ac4 sound support - giaur - 2020-11-01
Can you add it to your checklist? There is a big trouble with ac4 on pc in general, afaik there's still no any software that supports it.
RE: Ac4 sound support - asavah - 2020-11-02
Kodi uses ffmpeg for most decoding needs.
My guess would be that for ac4 to be available in Kodi it should be available in ffmpeg first and should be unencumbered by patents and legal bullshit which could prevent including it in any opensource project.
Edit:
Quote:Dolby AC-4 is covered by patents and requires a license from Dolby Laboratories.
RE: Ac4 sound support - giaur - 2020-11-02
Ffmpeg: https://trac.ffmpeg.org/ticket/8349
RE: Ac4 sound support - emveepee - 2021-01-02
@giaur what type of DVB-T2 device are you using?
Martin
RE: Ac4 sound support - giaur - 2021-01-03
(2021-01-02, 23:49)emveepee Wrote: @giaur what type of DVB-T2 device are you using?
Martin
Si2168 usb tunner with Tvheadend.
https://www.linuxtv.org/wiki/index.php/Silicon_Labs_Si2168
RE: Ac4 sound support - emveepee - 2021-01-03
Thanks I added some experimental support for AC4 with that prerelease ffmpeg in NextPVR which would work with IP addressable devices to NextPVR so I was curious if it would work. Would you be willing to place a 2 minute sample on an internet location I'd like to see how it works.
Thinking about it if the sample works, it could probably work via an m3u playlist from TVHeadend.
Martin
RE: Ac4 sound support - jjd-uk - 2021-01-03
Contrary to the original post it looks like there's a WIP branch to add AC-4 in ffmpeg in the linked ffmepg ticket.
RE: Ac4 sound support - emveepee - 2021-01-03
Yes that recent patch is the what I am using to transcode at source and send to Kodi. I have limited samples all ATSC 3.0 but so far so good. I am curious how it will work for others.
I asked last week and that patch is not stable or ready for Kodi at this time.
Martin
RE: Ac4 sound support - jjd-uk - 2021-01-03
Well it needs to accepted into ffmpeg Master before we will use it, once that is done then it's normally acceptable to cherry pick and backport to the ffmpeg version we are currently using.
RE: Ac4 sound support - giaur - 2021-01-03
(2021-01-03, 17:49)emveepee Wrote: Thanks I added some experimental support for AC4 with that prerelease ffmpeg in NextPVR which would work with IP addressable devices to NextPVR so I was curious if it would work. Would you be willing to place a 2 minute sample on an internet location I'd like to see how it works.
Thinking about it if the sample works, it could probably work via an m3u playlist from TVHeadend.
Martin
Dvb-t2 sample: http://91.145.139.141/test.mts
Fffmpeg output:
Code:
Duration: 00:00:39.11, start: 47836.389200, bitrate: 4263 kb/s
Program 83
Stream #0:0[0x12e]: Video: hevc (Main) ([36][0][0][0] / 0x0024), yuv420p(tv), 1920x1080 [SAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k tbn, 50 tbc
Stream #0:1[0x12f](pol): Audio: eac3 ([6][0][0][0] / 0x0006), 48000 Hz, stereo, fltp, 128 kb/s
Stream #0:2[0x130](qaa): Audio: eac3 ([6][0][0][0] / 0x0006), 48000 Hz, 5.1(side), fltp, 256 kb/s
Stream #0:3[0x134](aux): Audio: eac3 ([6][0][0][0] / 0x0006), 48000 Hz, stereo, fltp, 96 kb/s (visual impaired) (descriptions)
Stream #0:4[0x135](org): Data: bin_data (AC-4 / 0x342D4341)
Stream #0:5[0x14bb]: Unknown: none ([5][0][0][0] / 0x0005)
Program 84
Program 85
AC-4 track is visible as bin_data.
RE: Ac4 sound support - emveepee - 2021-01-03
Thanks. The sample so it shows the patch is incomplete or the source is a bad as it reports no channels. Does it sample play anywhere outside Kodi. If so maybe submit it to the patch.
Stream #0:5[0x135](org): Audio: ac4 (AC-4 / 0x342D4341), 0 channels
Martin
RE: Ac4 sound support - giaur - 2021-01-03
(2021-01-03, 23:42)emveepee Wrote: Thanks. The sample so it shows the patch is incomplete or the source is a bad as it reports no channels. Does it sample play anywhere outside Kodi. If so maybe submit it to the patch.
Stream #0:5[0x135](org): Audio: ac4 (AC-4 / 0x342D4341), 0 channels
Martin
What do you mean? Can't you play the sample? That's only single channel demuxed, not mux dump. It's playable, but ac4 track is ignored as unknown
RE: Ac4 sound support - emveepee - 2021-01-04
I can play the sample and while it is shorter than expected and a single program on the mux would have been easier, I can only toggle through audio tracks 2, 3 and 4 I assume because track 5 reports 0 channels.
Martin