LAV Filters - DirectShow Media Splitter and Decoders

[nevcairiel]

Originally Posted by mixus

I waiting HEVC QuickSync Decoding Support.

When will it arrive?

Use DXVA2, there are no plans to further develop QuickSync decoding.

[mixus]

Originally Posted by nevcairiel

Use DXVA2, there are no plans to further develop QuickSync decoding.

OK, Thanks for very fast reply.

[manolito]

Originally Posted by nevcairiel

PS:
I just tried AVStoDVD and it works perfectly fine and creates a 5.1 AC3 from my 5.1 DTS input.

Tried the same conversion on my Win7 laptop (Core i5 CPU, 4 GB RAM), and everything worked fine.

So the issue must have something to do with my ancient desktop PC. WinXP, CPU without SSE2, only 576 GB RAM.


Cheers
manolito

[JarrettH]

Is x265 decoding still getting faster? I only update LAV when it's integrated in the latest MPC release.

[ryrynz]

Originally Posted by JarrettH

I only update LAV when it's integrated in the latest MPC release.

Why? Just copy it over its the same thing..

[NikosD]

Does LAV video require SSE2 for DXVA (native or cb) ?

I have an old Win XP SP3+ system with Radeon 3650 AGP and AthlonXP (SSE only NOT SSE2) and LAV Video works only in SW decode mode using latest LAV v0.68

Also DXVA Checker reports LAV Video as DXVA2 only and not DXVA1/2 decoder.

[Aleksoid1978]

Originally Posted by NikosD

Does LAV video require SSE2 for DXVA (native or cb) ?

I have an old Win XP SP3+ system with Radeon 3650 AGP and AthlonXP (SSE only NOT SSE2) and LAV Video works only in SW decode mode using latest LAV v0.68

Also DXVA Checker reports LAV Video as DXVA2 only and not DXVA1/2 decoder.

LAV don't support DXVA 1.0 decoding.

[LigH]

Originally Posted by JarrettH

x265 decoding

x265 is one specific of many different encoders. The video format being decoded is called HEVC.

[NikosD]

If LAV Video doesn't support HW acceleration on Windows XP, maybe it should be noted in the first page of this thread which says that it supports Win XP SP3.

[huhn]

than you have to do that with all features that work on some OS and on some not and that would create a real mess.

and in the end DXVA2 can be used under XP but that's not reliable to say it friendly.

[wanezhiling]

https://www.sendspace.com/file/pmnymp
LAV says the duration as 9min49sec but actually it's 10min.

[nevcairiel]

Originally Posted by wanezhiling

https://www.sendspace.com/file/pmnymp
LAV says the duration as 9min49sec but actually it's 10min.

I can't download the file, it gets stuck at 5% or so, but alas, not really need more:

The math is quite simple, since its nice and CBR.
The stream is DTS at 1536kbit/s (or 192kB/s), for 10 minutes that would require 112.5 MB of data - but its only 107.9, so clearly the file isn't big enough for 10 minutes of audio at that bitrate.

[wanezhiling]

Originally Posted by nevcairiel

I can't download the file, it gets stuck at 5% or so

Try this host: https://drive.google.com/file/d/0B2L...203anF6U1QzZlE

Originally Posted by nevcairiel

The math is quite simple, since its nice and CBR.
The stream is DTS at 1536kbit/s (or 192kB/s), for 10 minutes that would require 112.5 MB of data - but its only 107.9, so clearly the file isn't big enough for 10 minutes of audio at that bitrate.

Ok, so on the contrary displaying 10min is incorrect?

[nevcairiel]

Originally Posted by wanezhiling

Ok, so on the contrary displaying 10min is incorrect?

MediaInfo and ffmpeg seem to disagree about the DTS bitrate (1536 vs 1509), that probably explains the difference. There is a slightly variation of "actual bitrate" and "nominal bitrate".
The thing is that to stay fully CBR, a dts encoder is *supposed* to pad the DTS stream to the nominal bitrate, but apparently most don't seem to do that, so you end up with slight differences.

[wanezhiling]

I see.
But there is a problem, when the dts is as an external track of a movie, then it can't match..hmmm...

[nevcairiel]

If you wanted this to be accurate and function properly, you would put it into a container (ie. a mka file). raw audio files are never going to be very fun to handle.

[NikosD]

Originally Posted by huhn

than you have to do that with all features that work on some OS and on some not and that would create a real mess.

and in the end DXVA2 can be used under XP but that's not reliable to say it friendly.

We are not talking about limitations of the OS or other factor here (for example the HW acceleration of VP9) but about limitations of LAV Video.

So, if LAV supports SW decoding only, on Windows XP and not HW decoding at all on that OS, it should be mentioned as a feature or limitation of LAV and not OS (Windows XP)

[nussman]

That's not true at all.
LAV supports DXVA2 and if it's not working on WinXP this is a limitation of the OS.

Imho every minute spend for WinXP is wasted time ...

[huhn]

Originally Posted by NikosD

We are not talking about limitations of the OS or other factor here (for example the HW acceleration of VP9) but about limitations of LAV Video.

So, if LAV supports SW decoding only, on Windows XP and not HW decoding at all on that OS, it should be mentioned as a feature or limitation of LAV and not OS (Windows XP)

you can use lavfilter with DXVA2 on windows XP. at least i'm pretty sure you can do that because i'm pretty sure i did this with an 6770 or ion1 or both many many years ago.

and it depends on the point of view if XP is missing a feature or lavfilter.

on XP DXVA2 isn't really supported.
lavfilter doesn't support the very old DXVA1.

windows XP is 15 years old so if someone wants to use this they have to life with broken or missing features.

[NikosD]

Both of you seem to misunderstand my point.

We don't judge here Windows XP and its capabilities, but the announcement of LAV Video supporting Win XP SP3.

If someone can use HW acceleration of LAV Video in Win XP SP3, please tell me how.