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Windows => Television => Topic started by: abrise on April 02, 2024, 04:29:35 am

Title: TS AC-4 support in new UHD DVBT2 channel
Post by: abrise on April 02, 2024, 04:29:35 am: There is a brand new channel here in France on DVBT that is UHD . More are coming this year. The JRIver recording is excellent and in the file mediainfo gives audio channels 1 in AC-4 and 3 on eac3. JRiver recognize and plays only the eac3 channels.
Is AC-4 of a better audio quality then eac3 ?
If yes how can I get it ?
Here is what media info reports for the 1st channel.

Audio #1
ID : 3022 (0xBCE)
Menu ID : 2305 (0x901)
Format : AC-4
Format/Info : Audio Coding 4
Commercial name : Dolby AC-4
Format version : Version 2
Codec ID : 6
Duration : 1 h 9 min
Channel(s) : 3 channels
Channel layout : L R C
Sampling rate : 48.0 kHz
Frame rate : 25.000 FPS (1920 SPF)
Compression mode : Lossy
Delay relative to video : -659 ms
Language : French
NOK : tools_metadata
Number of presentations : 3
NumberOfGroups : 4
Number of substreams : 4
Presentation #1 : Stereo Main (French)
Presentation ID : 0
Dialogue normalization : -24.00
Language : French
Loudness : Yes
Integrated loudness (speech gated) : -22.1 LKFS
Integrated loudness (level gated) : -22.9 LKFS
Audio Loudness Standard : ATSC A/85
Realtime loudness corrected : Yes
Dialogue corrected : Yes
Dynamic Range Control : Yes
Group #s : 1
Audio description : No
Audio rendering indication : Stereo
Dialogue enhancement : Yes
Interactivity enabled : No
Spoken subtitles : No
Presentation #2 : Stereo Main (qaa)
Presentation ID : 1
Dialogue normalization : -24.00
Language : qaa
Loudness : Yes
Integrated loudness (speech gated) : -22.1 LKFS
Integrated loudness (level gated) : -22.9 LKFS
Audio Loudness Standard : ATSC A/85
Realtime loudness corrected : Yes
Dialogue corrected : Yes
Dynamic Range Control : Yes
Group #s : 2
Audio description : No
Audio rendering indication : Stereo
Dialogue enhancement : Yes
Interactivity enabled : No
Spoken subtitles : No
Presentation #3 : Stereo Main + Associate (French)
Presentation ID : 2
Dialogue normalization : -24.00
Language : French
Multiple-stream : No
Loudness : Yes
Integrated loudness (speech gated) : -22.1 LKFS
Integrated loudness (level gated) : -22.9 LKFS
Audio Loudness Standard : ATSC A/85
Realtime loudness corrected : Yes
Dialogue corrected : Yes
Dynamic Range Control : Yes
Group #s : 3 + 4
Audio description : Yes
Audio rendering indication : Stereo
Dialogue enhancement : Yes
Interactivity enabled : No
Spoken subtitles : No
Group #1 : Main
Content classifier : Main
Language : French
Channel coded : Yes
Number of substreams : 1
Substream #s : 1
Group #2 : Main
Content classifier : Main
Language : qaa
Channel coded : Yes
Number of substreams : 1
Substream #s : 2
Group #3 : Main
Content classifier : Main
Language : French
Channel coded : Yes
Number of substreams : 1
Substream #s : 3
Group #4 : Associate
Content classifier : Visually Impaired
Language : qax
Channel coded : Yes
Number of substreams : 1
Substream #s : 4
Substream #1 : Stereo
Channel mode : Stereo
Channel layout : L R
Dialogue enhancement : Yes
Enabled : Yes
Max gain : 9 dB
Channel configuration : L R
Substream #2 : Stereo
Channel mode : Stereo
Channel layout : L R
Dialogue enhancement : Yes
Enabled : Yes
Max gain : 9 dB
Channel configuration : L R
Substream #3 : Stereo
Channel mode : Stereo
Channel layout : L R
Dialogue enhancement : Yes
Enabled : Yes
Max gain : 9 dB
Channel configuration : L R
Substream #4 : Mono
Channel mode : Mono
Channel layout : C
Title: Re: TS AC-4 support in new UHD DVBT2 channel
Post by: tzr916 on April 02, 2024, 07:51:57 am: Have you tried right clicking in the video area during playback and choosing "Streams" then choosing the AC-4 track?

USA ATSC 3.0 uses AC-4 and JRiver can play it multichannel pcm, not bitsreaming.
Title: Re: TS AC-4 support in new UHD DVBT2 channel
Post by: abrise on April 03, 2024, 01:02:16 am: Quote from: tzr916 on April 02, 2024, 07:51:57 am
Have you tried right clicking in the video area during playback and choosing "Streams" then choosing the AC-4 track?

USA ATSC 3.0 uses AC-4 and JRiver can play it multichannel pcm, not bitsreaming.

Yes of course when I rignt click I see only the eac3 channels although I know that AC-4 is in the file.
Title: Re: TS AC-4 support in new UHD DVBT2 channel
Post by: Hendrik on April 03, 2024, 02:49:32 am: Can you share a short recording from such a channel, so we can check why it isn't shown?
Title: Re: TS AC-4 support in new UHD DVBT2 channel
Post by: abrise on April 03, 2024, 11:20:24 am: Quote from: Hendrik on April 03, 2024, 02:49:32 am
Can you share a short recording from such a channel, so we can check why it isn't shown?
Yes here is a one minute recording I just made. Hope it is not too big. Around 150mB . I don't know how to cut it below 3mB so here is a link. Hope it works
https://1drv.ms/u/s!AvHNGCtiepfPiLFPEgb2pBhXF6YNUg?e=g01scM
Title: Re: TS AC-4 support in new UHD DVBT2 channel
Post by: tzr916 on April 03, 2024, 11:51:19 am: Quote from: abrise on April 03, 2024, 01:02:16 am
Yes of course when I rignt click I see only the eac3 channels although I know that AC-4 is in the file.

Same result here with your sample file, using JRiver and Zoom Player. Neither are showing the AC-4 stream! Maybe the broadcast station is "doing it wrong"?
Title: Re: TS AC-4 support in new UHD DVBT2 channel
Post by: Hendrik on April 03, 2024, 02:55:02 pm: Quote from: abrise on April 03, 2024, 11:20:24 am
Yes here is a one minute recording I just made. Hope it is not too big. Around 150mB . I don't know how to cut it below 3mB so here is a link. Hope it works
https://1drv.ms/u/s!AvHNGCtiepfPiLFPEgb2pBhXF6YNUg?e=g01scM

Thats fine, thanks.