LAV Filters - DirectShow Media Splitter and Decoders

[nevcairiel]

Originally Posted by TDiTP_

Lav Audio decodes this TrueHD 6.1 configuration to WAVE_FORMAT_EXTENSIBLE with MaskChannels = 0x1060F (FL FR FC LF SL SR TBC). I think it isn't properly, there is no 'Top Back Center' in such configuration. Correct Mask must be 9743 (FL FR FC LF SL SR TFC). BTW eac3to uses just such mask for decoding this type of THD 6.1.

The same story for this configuration:
Lav Audio decodes it to WAVE_FORMAT_EXTENSIBLE with MaskChannels = 0x1060F (FL FR FC LF SL SR TBC). I think mask must be 3599 (FL FR FC LF SL SR TC). Again, eac3to uses the same.

Thanks, i found the problem and a patch to solve it, will apply it later, it should make all "unusual" channel layouts behave more sanely.
Not sure which typical speakers those should be output to, though - who really has a TFC or TC speaker? :d

[XadoX]

Can the LAV Video decoder use DXVA or CUVID?

[golagoda]

Originally Posted by XadoX

Can the LAV Video decoder use DXVA or CUVID?

Yes it can, there's an option to enable CUVID hardware decoding in the lav video options... it's set to not be used by default though since it only works on Nvidia GPU's.

[XadoX]

Ok thx for the feedback.

[dann23]

Originally Posted by golagoda

Yes it can, there's an option to enable CUVID hardware decoding in the lav video options... it's set to not be used by default though since it only works on Nvidia GPU's.

we also hope that someday maybe nevcairiel thinks about radeon owners and I won't mentions subtitles support because he already feels guilty that many people are using wmp and wmc with lav splitter

[Mixer73]

Originally Posted by dann23

we also hope that someday maybe nevcairiel thinks about radeon owners and I won't mentions subtitles support because he already feels guilty that many people are using wmp and wmc with lav splitter

Actually AMD needs to think about Radeon owners...

[Pat357]

Originally Posted by chapas

Haali Splitter + CoreAVC = Sloppy seeking

That's kind of odd, because the "recent" changes in HMS are the results of a very close corporation between HMS developer and CoreAVC developer(s).
As you certainly know, CoreAVC comes even bundled with the Haali splitter as their default splitter!

Maybe it's the new splitter?

Not sure, but, as I understand it, recent lav-splitter versions are a more "Haali alike" then say v0.37. It could of course as well be an issue with CoreAVC.
I stopped using CoreAVC shortly after the v3.0 release and went to LAV video. I don't think I'll ever consider switching back : CoreCodec is a way too slow for me for fixing issues & releasing bugfixes.
Anyway, I'm currently very happy with LAV (splitter + audio + video) !

[chapas]

I have an ATI card, so no hardware acceleration for LAV Video, hence CoreAVC. I read the MKV splitter changed for the latest LAV Filter releases, so I wanted to confirm if the problem is indeed CoreAVC.

[nevcairiel]

CoreAVC is known for its slow seeking.

[T3rm1]

Originally Posted by Andy o

I'd say he's running two different audio devices and displays so anything's possible. The obvious way to test would be to decode with LAV both times, and not with switch to VLC (or not switch monitors/audio devices when switching to VLC). T3rm1, are you running different refresh rates for the two scenarios you describe? Is the audio delayed, or the video? If so to the former, try running your TV at the same rate as the monitor and see if it's the same then.

The audio plays too late. Same problem with DolbyDTS. TV has same refresh rate.

[mkanet]

Hi nevcairiel (and fellow experienced video experts):

I have a 4 year old mystery I've been trying to solve. I have the ability to capture the original mpeg2 transport stream 1080i recordings from my digital cableTV provider's cable box. For some reason, these streams are very difficult to playback smoothly on many devices. They play fine on standalone hardware media playback devices such as sageTV HD300. On my old Nvidia GT8500, these files played back perfectly as well.

However on devices that can't play it back correctly, they playback with stutter/judder. I have seen this on a few different PCs (Nvidia 8800GT, 9800GT, GT 545)

I just recently played back these files with the latest LAV Video decoder + CUVID + Nvidia GT545.

I used Reclock to see what framerate LAV Video is decoding at... and, I think I may have found the problem (or at least one problem). The frame rate for the same media file changes relatively frequently anywhere from 24fps to 47.952fps to 59.940 to 60.000fps throughout the video. If I have LAV Aggressive Deinterlacing enabled, the FPS starts changing much more frequently; sometimes within just a couple of seconds.

When the video is detected at 24.000fps, the video plays back smoothly. However, it doesn't stay on that FPS for very long.

Could you please try both samples below to see if there's a clever way to stabilize the FPS for this type of media WITHOUT adversely affecting other media files that already play back correctly? I am guessing the correct FPS is supposed to be 24fps; since that offers the most stable playback on my PC.


http://www.filedropper.com/dexter-sinofomission
http://www.filedropper.com/missionimpossible_1


Thanks a million,
MKANET

[Andy o]

Haven't downloaded yet, but from the titles, it's certainly telecined content. I could do IVTC with CUVID deinterlacing and decimating with an avisynth script in ffdshow's processor (I think it was tdecimate). Right now I'm back on AMD though.

[mkanet]

Hi Andy, Nvidia IVTC doesnt work on this type of content like it does with other telecined digital TV content. I'm hoping someone here can figure out a way to play these files back automatically in directshow; just like other telecined content that does playback correctly. I dont want to add processing to other files that dont need it though. The interesting thing is even my old junky Nvidia 8500GT which could barely do inverse telecine for 1080i did it just fine.. smooth as silk; and, very sharp. It would be nice to know what makes these types of files so special. Comcast has been using this format for over a decade on their non-local TV channels.

Originally Posted by Andy o

Haven't downloaded yet, but from the titles, it's certainly telecined content. I could do IVTC with CUVID deinterlacing and decimating with an avisynth script in ffdshow's processor (I think it was tdecimate). Right now I'm back on AMD though.

[Andy o]

What software/filters were you using with the 8500GT to have IVTC?

[mkanet]

Nothing fancy. All mpeg2 decoders with hardware acceleration enabled played these files back with no problem on the 8500GT. I vaguely remember using Nvidia Purevideo HD mpeg 2 decoder and SageTV's mpeg2 decoder (I think it's based off Mediaconcepts mpeg2 decoder. There were no LAV based video decoders back then. Intrestingly, the 8800GT; which was relatively close to the 8500GT in decoding capabilities had the same kind of stuttering issues my brand new display adapter has with this kind of media.

Originally Posted by Andy o

What software/filters were you using with the 8500GT to have IVTC?

[chaddawkins]

LAV Audio playback is noticeably quieter than when I play movies with AC3Filter for every type of audio. Why? Is there some way to change this? Gain?
thanks

EDIT:
My setup - computer to tv via hdmi, tv to soundbar via optical, soundbar to sub via wireless
I barely hear anything coming from the sub.

[SoBizarre]

Dexter clip posted by mkanet plays (almost) smoothly using PotPlayer internal MPEG2 decoder, while using LAV decoder makes it unwatchably choppy. Also, Reclock is recognizing video stream as 23.976 fps and reports changing playback speed to 24fps, while madVR is reporting file being 29,970fps. Why is all that?

[dead_screem]

this probly has to do with pulldown being used but not flagged/flagged improperly in the stream. nev has done work in the past to get dvd's with non-flagged pulldown playing back right, but without the ivtc so you won't get the 24fps playback however lav still fails with hd mpeg2 content. you can get these to play smoothly by enabling the "treat as progressive" option, but you'd have to disable it again to get actual interlaced content working again...
fwiw mpc-hc's internal mpeg-2 decoder (libmpeg2) always plays back such content correctly.

[kasper93]

There is bug with internal MPC-HC mpeg2 splitter and LAV Video. Audio goes out of sync. With any other video decoder it works fine. I use lav splitter anyway, but I think you should know about this bug.

[nevcairiel]

Originally Posted by mkanet

Could you please try both samples below to see if there's a clever way to stabilize the FPS for this type of media WITHOUT adversely affecting other media files that already play back correctly? I am guessing the correct FPS is supposed to be 24fps; since that offers the most stable playback on my PC.

I tried downloading the files several times with different browsers, but all it got me were broken files (everytime in a different size!)
Please use a better file hoster.

Anyway, the problem with such files in general is that when broadcast they are quite commonly mixed progressive and telecined content - with one additional problem: Everything is coded as interlaced.
Its basically impossible to properly detect this. The only solution for "fluid" playback is to simply use half-rate deinterlacing, which means it'll deinterlace the frames, removing all interlacing artifacts, but not add additional frames. This can be done with the CUVID decoder or YADIF deinterlacing (set it to 25p/30p mode), if you rely on the renderer for deinterlacing, you cannot do this.

MPC-HCs MPEG-2 decoder by default uses its own deinterlacing, and does not send the flags to the renderer. If it would, you would probably see similar issues.

Overall, such content is just horrible, and i have no real interest and spending hours trying to fix it, i'll leave that to people that get paid to deal with crappy designs like this. (I don't watch such content either, our broadcasts are pretty sane - also, madVR seems to hide the timestamp jitter pretty well, i only really see issues with EVR-CP)