LAV Filters - DirectShow Media Splitter and Decoders - Page 1119

nevcairiel · 30th December 2017, 00:24

Quote:

Originally Posted by jmone

Here is a 40 sec sample from a UHD BD with Atmos Track (325MB) where at the 33sec mark the ATMOS track drops out when bitstreaming to an AVR. There is no issue when playing the original Disc using a HW Player (and others have reported that it also plays fine on a PC using PDVD). The issue is constant across several users all with different setups but one commonality is that it just seems to be SW players like JRiver and MPC-HC that has the issue.

The actual layout of the Dolby MAT frame used to encapsulate TrueHD for HDMI transmission is unknown and undocumented, so unless someone finds the specification how to do this, I'm afraid there isn't even a starting point to start looking.

jmone · 30th December 2017, 00:52

Thanks - I'm not sure how common the issue will be but it seems to be limited to 2 x Disney discs so far (and both report having a high audio bitrate). The majority of the sound track is fine, but you then hit these points and sound is dropped (the amount of the drop seems to vary by the users setup from a brief drop to my setup where it is 10 sec). We are just guessing it is ffmpeg related given the players that are affected but don't really know. Is it worth opening a Ticket at https://trac.ffmpeg.org/ or would it just be wasting everyone time (and also if so is the sample too large)?

ashlar42 · 30th December 2017, 23:45

Am I correct in assuming LAVfilters won't upmix stereo audio to 5.1 (or surround in general)?

LigH · 31st December 2017, 00:10

No affirmative answer from me ... but I believe no. LAV Filters will surely not upmix any stereo with arbitrary parameters, and I believe it has no ProLogic decoder either. Leave that to an attached A/V receiver in your shelf...

ashlar42 · 31st December 2017, 00:15

Quote:

Originally Posted by LigH

No affirmative answer from me ... but I believe no. LAV Filters will surely not upmix any stereo with arbitrary parameters, and I believe it has no ProLogic decoder either. Leave that to an attached A/V receiver in your shelf...

Yeah, that's what I do. I was asking for a fellow Kodi DSPlayer user.

foozoor · 4th January 2018, 14:37

Is kodi dsplayer still working?
I thought this sh*t was unstable and no longer maintained.

mclingo · 4th January 2018, 17:33

Quote:

Originally Posted by foozoor

Is kodi dsplayer still working?
I thought this sh*t was unstable and no longer maintained.

Well, you'd be completely wrong on both counts thankfully, a lot of hard work has gone into this and dev is still going strong, your comments and not appreciated.

ashlar42 · 6th January 2018, 14:54

Quote:

Originally Posted by nevcairiel

Hopefully I get some more time over the holidays to finish some things and make a release then.

Hi! Any progress on this? Just an update request, no hurry or anything. All the best for your 2018.

ashlar42 · 6th January 2018, 14:56

Quote:

Originally Posted by foozoor

Is kodi dsplayer still working?
I thought this sh*t was unstable and no longer maintained.

Well... I'd say it's arguably the most advanced media center solution available, with the best video and audio quality available. Far from being "sh*t", unstable or no longer mantained.

DragonQ · 7th January 2018, 11:17

Quote:

Originally Posted by ashlar42

Well... I'd say it's arguably the most advanced media center solution available, with the best video and audio quality available. Far from being "sh*t", unstable or no longer mantained.

Kodi DSPlayer is generally stable and maintained, but the MediaPortal TV-Server plugin is very buggy, which prevents me from moving from MediaPortal for live TV playback.

foozoor · 7th January 2018, 14:00

I didn't know aracnoz continued the development.
I thought he was looking for a new owner.
It seems mediaportal works with madvr now.

iSeries · 8th January 2018, 14:28

Hi, I get occasional audio dropouts when bitrstreaming atmos/truedhd. All other formats work fine. If I switch to decoding, also fine. Does anyone have any idea what could be causing the dropouts? (MPC-BE with internal renderer, MadVR, Win10)

ryrynz · 8th January 2018, 23:41

Try a different HDMI cable.

nevcairiel · 9th January 2018, 00:17

Atmos bitstreaming is not fully understood. If the bitrate exceeds a certain limit, it breaks apart, because its not known how to handle that. This was never a problem with ordinary TrueHD since the bitrate doesn't get high enough. Unfortunately the specifications for that are not available anywhere online (not even to buy), since its not part of the IEC standard that usually controls HDMI bitstreaming. So if anyone knows how Dolby MAT (Metadata-enhanced Audio Transport) works - the format used to wrap TrueHD and Atmos for HDMI transmission, please let me know.

iSeries · 9th January 2018, 13:48

Thanks for the explanation Nev. I'll switch to software decoding for problematic tracks.

VAMET · 9th January 2018, 13:53

Dear Friends

Quote:

Originally Posted by iSeries

Hi, I get occasional audio dropouts when bitrstreaming atmos/truedhd. All other formats work fine. If I switch to decoding, also fine. Does anyone have any idea what could be causing the dropouts? (MPC-BE with internal renderer, MadVR, Win10)

Quote:

Originally Posted by ryrynz

Try a different HDMI cable.

Quote:

Originally Posted by nevcairiel

Atmos bitstreaming is not fully understood. If the bitrate exceeds a certain limit, it breaks apart, because its not known how to handle that. This was never a problem with ordinary TrueHD since the bitrate doesn't get high enough. Unfortunately the specifications for that are not available anywhere online (not even to buy), since its not part of the IEC standard that usually controls HDMI bitstreaming. So if anyone knows how Dolby MAT (Metadata-enhanced Audio Transport) works - the format used to wrap TrueHD and Atmos for HDMI transmission, please let me know.

The problem exist for example in movie PIRATES OF THE CARIBBEAN: DEAD MEN TELL NO TALES [2017] [2160P], where Dolby Atmos is 9Mbps, there are lots of dropouts for 1 second long and then sound is playing OK. It occurs, when there are shooting, explosions etc. HDMI cable change do nothing at all, I have tested for the cheapest and the most expensive ones and everytime the same problem with audio. When I convert to LPCM or change to not bitrstreaming via LAV Filters, there is no problem. After changing to bitstreaming, the problem occurs.

Sincerely

iSeries · 9th January 2018, 18:46

Nev is it possible to add an extra box in the audio decoding properties, for Atmos/truehd tracks? So I could choose to bitstream truehd tracks but software decode atmos/truehd tracks.

EDIT: Also, does anyone know why software decoding is so much quieter than bitstreaming?

nevcairiel · 9th January 2018, 19:09

LAV doesn't currently know if a stream contains Atmos extensions.

huhn · 9th January 2018, 19:49

Quote:

Originally Posted by iSeries

EDIT: Also, does anyone know why software decoding is so much quieter than bitstreaming?

because your system and player audio are not at 100 %?
alternatively the mixing.

iSeries · 9th January 2018, 19:54

Using wasapi exclusive so always 100% when sending lpcm (but regardless all are set to 100% anyway). I noticed this a bunch of years ago when I had a Yamaha avr and it's the same with my Denon now. Sending lpcm to my receiver is notably quieter than bitstreaming.

31st December 2017, 00:10	#22364 \| Link
LigH German doom9/Gleitz SuMo Join Date: Oct 2001 Location: Germany, rural Altmark Posts: 6,781	No affirmative answer from me ... but I believe no. LAV Filters will surely not upmix any stereo with arbitrary parameters, and I believe it has no ProLogic decoder either. Leave that to an attached A/V receiver in your shelf... __________________ New German Gleitz board MediaFire: x264 \| x265 \| VPx \| AOM \| Xvid

9th January 2018, 00:17	#22374 \| Link
nevcairiel Registered Developer Join Date: Mar 2010 Location: Hamburg/Germany Posts: 10,346	Atmos bitstreaming is not fully understood. If the bitrate exceeds a certain limit, it breaks apart, because its not known how to handle that. This was never a problem with ordinary TrueHD since the bitrate doesn't get high enough. Unfortunately the specifications for that are not available anywhere online (not even to buy), since its not part of the IEC standard that usually controls HDMI bitstreaming. So if anyone knows how Dolby MAT (Metadata-enhanced Audio Transport) works - the format used to wrap TrueHD and Atmos for HDMI transmission, please let me know. __________________ LAV Filters - open source ffmpeg based media splitter and decoders

9th January 2018, 18:46	#22377 \| Link
iSeries Registered User Join Date: Jan 2009 Posts: 625	Nev is it possible to add an extra box in the audio decoding properties, for Atmos/truehd tracks? So I could choose to bitstream truehd tracks but software decode atmos/truehd tracks. EDIT: Also, does anyone know why software decoding is so much quieter than bitstreaming? Last edited by iSeries; 9th January 2018 at 19:28.

9th January 2018, 19:09	#22378 \| Link
nevcairiel Registered Developer Join Date: Mar 2010 Location: Hamburg/Germany Posts: 10,346	LAV doesn't currently know if a stream contains Atmos extensions. __________________ LAV Filters - open source ffmpeg based media splitter and decoders

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30th December 2017, 00:52	#22362 \| Link
jmone Registered User Join Date: Dec 2007 Posts: 652	Thanks - I'm not sure how common the issue will be but it seems to be limited to 2 x Disney discs so far (and both report having a high audio bitrate). The majority of the sound track is fine, but you then hit these points and sound is dropped (the amount of the drop seems to vary by the users setup from a brief drop to my setup where it is 10 sec). We are just guessing it is ffmpeg related given the players that are affected but don't really know. Is it worth opening a Ticket at https://trac.ffmpeg.org/ or would it just be wasting everyone time (and also if so is the sample too large)?

30th December 2017, 23:45	#22363 \| Link
ashlar42 Registered User Join Date: Jun 2007 Posts: 655	Am I correct in assuming LAVfilters won't upmix stereo audio to 5.1 (or surround in general)?

4th January 2018, 14:37	#22366 \| Link
foozoor Registered User Join Date: Feb 2012 Posts: 116	Is kodi dsplayer still working? I thought this sh*t was unstable and no longer maintained.

7th January 2018, 14:00	#22371 \| Link
foozoor Registered User Join Date: Feb 2012 Posts: 116	I didn't know aracnoz continued the development. I thought he was looking for a new owner. It seems mediaportal works with madvr now.

8th January 2018, 14:28	#22372 \| Link
iSeries Registered User Join Date: Jan 2009 Posts: 625	Hi, I get occasional audio dropouts when bitrstreaming atmos/truedhd. All other formats work fine. If I switch to decoding, also fine. Does anyone have any idea what could be causing the dropouts? (MPC-BE with internal renderer, MadVR, Win10)

8th January 2018, 23:41	#22373 \| Link
ryrynz Registered User Join Date: Mar 2009 Posts: 3,650	Try a different HDMI cable.

9th January 2018, 13:48	#22375 \| Link
iSeries Registered User Join Date: Jan 2009 Posts: 625	Thanks for the explanation Nev. I'll switch to software decoding for problematic tracks.

9th January 2018, 19:54	#22380 \| Link
iSeries Registered User Join Date: Jan 2009 Posts: 625	Using wasapi exclusive so always 100% when sending lpcm (but regardless all are set to 100% anyway). I noticed this a bunch of years ago when I had a Yamaha avr and it's the same with my Denon now. Sending lpcm to my receiver is notably quieter than bitstreaming.