DCA with variable channels/format

shekh · 25th July 2017, 11:53

How common are such files?
Can somebody share an example?
I got one but it is all mute (not interesting).

ffprobe output looks like this:

Quote:

[FRAME]
media_type=audio
stream_index=1
key_frame=1
pkt_pts=19334
pkt_pts_time=19.334000
pkt_dts=19334
pkt_dts_time=19.334000
best_effort_timestamp=19334
best_effort_timestamp_time=19.334000
pkt_duration=10
pkt_duration_time=0.010000
pkt_pos=5318875
pkt_size=2012
sample_fmt=fltp
nb_samples=512
channels=6
channel_layout=5.1(side)
[SIDE_DATA]
side_data_type=AVMatrixEncoding
side_data_size=4
[/SIDE_DATA]
[/FRAME]
[FRAME]
media_type=audio
stream_index=1
key_frame=1
pkt_pts=19345
pkt_pts_time=19.345000
pkt_dts=19345
pkt_dts_time=19.345000
best_effort_timestamp=19345
best_effort_timestamp_time=19.345000
pkt_duration=10
pkt_duration_time=0.010000
pkt_pos=5318875
pkt_size=2868
sample_fmt=s16p
nb_samples=512
channels=8
channel_layout=7.1
[SIDE_DATA]
side_data_type=AVMatrixEncoding
side_data_size=4
[/SIDE_DATA]
[/FRAME]

sneaker_ger · 25th July 2017, 12:00

Not uncommon on Blu-ray.

https://www.sendspace.com/file/pqmqwx (core/es)
https://www.sendspace.com/file/cua5w1 (core/es/ma)

/edit:
It seems my samples are actually something else. MediaInfo shows multiple layouts incl. 5.1 but ffprobe always says

Code:

channels=7
channel_layout=6.1

Either one them is wrong or there are different ways to store multiple layouts (downmixing?).

shekh · 25th July 2017, 12:51

Yes, your samples appear as single format when decoding.
I suspect that my sample was actually result of some mistake.

sneaker_ger · 25th July 2017, 12:59

Yes, maybe. You could create e.g. 5.1 and 7.1 and just binary concat them and get such files but are they allowed on Blu-ray? Probably not. Any TV channels using DTS? If you can find switching layouts it's usually only on TV.

shekh · 25th July 2017, 15:12

Thanks for hint, I concatenated your samples and at least VLC is happy with it

tebasuna51 · 25th July 2017, 15:53

@sneaker_ger
Your samples are DTS-ES, 6.1 both, the second with MA extension.

Maybe this one (MA 7.1, core 5.1): https://www.sendspace.com/file/tpumwx

Concat different channels layouts is not recommended, in BluRay must be in different m2ts.

sneaker_ger · 25th July 2017, 15:55

No, ffprobe will show "channels=8" only. It's the same as my samples.

25th July 2017, 12:00	#2 \| Link
sneaker_ger Registered User Join Date: Dec 2002 Posts: 5,565	Not uncommon on Blu-ray. https://www.sendspace.com/file/pqmqwx (core/es) https://www.sendspace.com/file/cua5w1 (core/es/ma) /edit: It seems my samples are actually something else. MediaInfo shows multiple layouts incl. 5.1 but ffprobe always says Code: channels=7 channel_layout=6.1 Either one them is wrong or there are different ways to store multiple layouts (downmixing?). Last edited by sneaker_ger; 25th July 2017 at 12:16.

25th July 2017, 12:51	#3 \| Link
shekh Registered User Join Date: Mar 2015 Posts: 775	Yes, your samples appear as single format when decoding. I suspect that my sample was actually result of some mistake. __________________ VirtualDub2

25th July 2017, 15:53	#6 \| Link
tebasuna51 Moderator Join Date: Feb 2005 Location: Spain Posts: 6,915	@sneaker_ger Your samples are DTS-ES, 6.1 both, the second with MA extension. Maybe this one (MA 7.1, core 5.1): https://www.sendspace.com/file/tpumwx Concat different channels layouts is not recommended, in BluRay must be in different m2ts. __________________ BeHappy, AviSynth audio transcoder. Last edited by tebasuna51; 25th July 2017 at 16:00.

25th July 2017, 12:59	#4 \| Link
sneaker_ger Registered User Join Date: Dec 2002 Posts: 5,565	Yes, maybe. You could create e.g. 5.1 and 7.1 and just binary concat them and get such files but are they allowed on Blu-ray? Probably not. Any TV channels using DTS? If you can find switching layouts it's usually only on TV.

25th July 2017, 15:12	#5 \| Link
shekh Registered User Join Date: Mar 2015 Posts: 775	Thanks for hint, I concatenated your samples and at least VLC is happy with it

25th July 2017, 15:55	#7 \| Link
sneaker_ger Registered User Join Date: Dec 2002 Posts: 5,565	No, ffprobe will show "channels=8" only. It's the same as my samples.