MediaPortal Audio renderer - better video playback quality (2 Viewers)

[Truri]

AW: Re: AW: MediaPortal Audio renderer - better video playback quality

@tourettes
Is there a way to fix that problem with this video or is simply the video "trash"?
Would it be a solution to set 24Hz as fps in the mkv container?

No need to trash that file yet At least MS H264 video decoder seems to be playing not so nicely, so it could be a codec issue we are seeing here. From GraphEdit:

Input 333667 == 29.97 fps
Output 417083 == 23.976 fps

Could you check how it behaves with different video codecs? (I'm a bit out of time today...).

I tried the following codecs:
MPC
ffdshow / ffdshow DXVA (with libavcodec/ffmpeg-mt)
MS DTV Codec
CoreCodec

With all these codecs the same behavior.
ffdshow shows ~24fps

 

[tourettes]

You can always use IRSS + IR Blaster to map your remote volume buttons to macros that send IR commands to you TV Set or Amp.

Yep, but even that won't preserve the sound quality that will be lost in the digital volume control

Why not?
AFAIK volume control in Amps is not done using any DSP technique. Most amps will have a "digitally controlled potentiometer" i.e. a variable resistor whose resistance can be controlled by setting a binary value. I've also seen Amps having a regular volume control knob that can be controlled from the remote using an internal motor (motor will actually turn the knob at the response of the IR remote). How is any of that going to degrade signal quality (I assume you do use some kind of volume control and do not leave your amp at 100%/0db right?)

Sorry, my bad... I was just somehow mixing the IRSS to control the WASAPI renderer's volume. Dunno how I did manage to do that.

 

[Truri]

AW: MediaPortal Audio renderer - better video playback quality

I tried now to set 24fps in the mkv container.
It seems to me that there was nothing set (blank) befor according to mkvmerge gui.

With this setting the refreshrate gets changed to 24Hz and all three lines where flat.

I will make a real playback test and report back.

----
So now after some playback time the sound is to late. ^^
Would have be too easy :s

Ok, now i didn't get it any more...
I just checked on the US retail DVDs.
Refreshrate changed to 60Hz
Statsscreens shows ~24fps

The odd is, the warnings and producer intro videos on the dvd where played correct with 60Hz.
But after that comes a trailer for an other anime dvd release and beginning with that trailer the fps goes back to ~24.


I have found an other show with the exact same behavior.
Also an US DVD Rip.

Now I searched through my few US-DVDs and I found an other release where exaclty the same happens, its the same publisher like the one from the sample video.
Besides that I have an other show from a different publisher where the DVD is played with 24Hz/24fps.

 

[tourettes]

Re: AW: MediaPortal Audio renderer - better video playback quality

I tried now to set 24fps in the mkv container.
It seems to me that there was nothing set (blank) befor according to mkvmerge gui.

With this setting the refreshrate gets changed to 24Hz and all three lines where flat.

I will make a real playback test and report back.

----
So now after some playback time the sound is to late. ^^
Would have be too easy :s

Ok, now i didn't get it any more...
I just checked on the US retail DVDs.
Refreshrate changed to 60Hz
Statsscreens shows ~24fps

The odd is, the warnings and producer intro videos on the dvd where played correct with 60Hz.
But after that comes a trailer for an other anime dvd release and beginning with that trailer the fps goes back to ~24.


I have found an other show with the exact same behavior.
Also an US DVD Rip.

Now I searched through my few US-DVDs and I found an other release where exaclty the same happens, its the same publisher like the one from the sample video.
Besides that I have an other show from a different publisher where the DVD is played with 24Hz/24fps.

Actually it is inverse telecine what we are seeing. In short: movies are shot in 24 or 23.976 fps and the NTSC is 29.97 fps / 59.94 Hz. Telecine is used to generate the NTSC material out of the film marial (in Europe we have the PAL speedup 23.976 to 25 done for DVDs). So the codec is actually doing the IVTC and recostructing the original 23.976 / 24 fps material from the 29.97 fps. Wi-Fizzle.com | IVTC Explained

1) I have no clue how MP / MediaInfo should detect the IVTC that can be done. It cannot be done for non-film sourced 29.97 fps material. Maybe there is some flag in the stream?

2) I have no clue why having 24 Hz as refresh rate will cause any drifting.

 

[Truri]

AW: MediaPortal Audio renderer - better video playback quality

Ok, I understand what you mean and thx for your explanation.

 

[Truri]

AW: MediaPortal Audio renderer - better video playback quality

Sooo and again I think I found a solution:

I have set in the mkv "24000/1001" and not "24" and it stays sync.

So this seems to be the only way?!

Does someone know how to do this for a bunch of files automatically?

 

[Truri]

AW: MediaPortal Audio renderer - better video playback quality

So after ~ 2h DVD playback the sound is still sync.
There seem to be no problems.

Only the red line is really shaking.

drift4.png DVD after ~1h
drift5.png DVD after ~2h

 

[tourettes]

Re: AW: MediaPortal Audio renderer - better video playback quality

Only the red line is really shaking.

Bad looking red line is a result of 60 Hz display and 23.976 material played on it. Try 24 Hz mode and then play the same video.

So after ~ 2h DVD playback the sound is still sync.
There seem to be no problems.

So DVDs with that IVTC done are working ok? I'm still a bit confused why the drifting was happening with that .mkv and 29.97 info in the container itself. The drifting should have been much worse if the 23.976 vs 29.97 would have been the source.

 

[tourettes]

Re: AW: MediaPortal Audio renderer - better video playback quality

I have set in the mkv "24000/1001" and not "24" and it stays sync.

Was the file originally 29.97 or 24 instead of the 23.976 (24000/1001)?

 

[davidf]

Re: AW: MediaPortal Audio renderer - better video playback quality

Only the red line is really shaking.

Bad looking red line is a result of 60 Hz display and 23.976 material played on it. Try 24 Hz mode and then play the same video.

So after ~ 2h DVD playback the sound is still sync.
There seem to be no problems.

So DVDs with that IVTC done are working ok? I'm still a bit confused why the drifting was happening with that .mkv and 29.97 info in the container itself. The drifting should have been much worse if the 23.976 vs 29.97 would have been the source.

Drift correction wouldn't be applied as the bias will be >+/-10% on a 60hz display.