Subtitles showing black band on 10 bit MKV

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Subtitles showing black band on 10 bit MKV

Post by darrenliew96 on Sat Oct 01, 2016 4:16 pm




Occationally it will show black bands for SSA AAS styled  subtitles on my 10 bit MKV Video.
and sometimes the 10bit mkv video hangs.





How to solve this? Changing to FFDshow decoder doesn't help.


http://imgur.com/a/IXHba

LOGS for my Laptop setup
http://pastebin.com/t0FDfSUL

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Re: Subtitles showing black band on 10 bit MKV

Post by Admin on Sun Oct 02, 2016 9:43 pm

I will download that same file to test.

You can try disabling hardware acceleration in the video decoder.

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Re: Subtitles showing black band on 10 bit MKV

Post by darrenliew96 on Sun Oct 02, 2016 10:44 pm

Admin wrote:I will download that same file to test.

You can try disabling hardware acceleration in the video decoder.

i am using software decoder to decode this 10 bit video.

anyway, here is the link to the video.

zippyshare.com/v/LPiwE3ze/file.html
Code:
http://www118.zippyshare.com/v/LPiwE3ze/file.html

*LINK IS PURELY FOR TESTING PURPOSE ONLY, NOT FOR DISTRIBUTION*

Edit 1: forgot to say something. Now I am using VLC since Klite is giving this error. VLC is able to decode the 10 bit video perfectly with softsubs.

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Re: Subtitles showing black band on 10 bit MKV

Post by Admin on Mon Oct 03, 2016 8:48 am

The file plays correctly here.

I think it might be caused by your graphics driver. Here is the latest version of the Intel driver:
https://downloadmirror.intel.com/26229/eng/win64_154028.4501.exe

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Re: Subtitles showing black band on 10 bit MKV

Post by darrenliew96 on Mon Oct 03, 2016 2:04 pm

Admin wrote:The file plays correctly here.

I think it might be caused by your graphics driver. Here is the latest version of the Intel driver:
https://downloadmirror.intel.com/26229/eng/win64_154028.4501.exe

did you try playing the file a little longer like at least 4-5 mins?  The subtitles will randomly show black box. (cannot render)

I am pretty sure that my graphics driver both Nvidia and Intel are latest but it is still happening.

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Re: Subtitles showing black band on 10 bit MKV

Post by Admin on Tue Oct 04, 2016 12:16 am

Yes, no issues here even with playing a long time.

The subtitles and the video are blended inside the video renderer (when using the internal subtitle renderer of MPC-HC). This depends on the driver functioning correctly.

The Intel driver version in your log is older than the one I linked to. So certainly worth trying that.

Other options are to use a different video renderer or to switch to VSFilter for subtitles.
MPC-HC options > Playback > Output

If you right-click on mpc-hc64.exe then you should be able to select which GPU you want to use, Intel or NVidia.

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Re: Subtitles showing black band on 10 bit MKV

Post by darrenliew96 on Tue Oct 04, 2016 3:11 am

Admin wrote:Yes, no issues here even with playing a long time.

The subtitles and the video are blended inside the video renderer (when using the internal subtitle renderer of MPC-HC). This depends on the driver functioning correctly.

The Intel driver version in your log is older than the one I linked to. So certainly worth trying that.

Other options are to use a different video renderer or to switch to VSFilter for subtitles.
MPC-HC options > Playback > Output

If you right-click on mpc-hc64.exe then you should be able to select which GPU you want to use, Intel or NVidia.

Just update my drivers but problem still exist. Trying VSFilter now see does it help.

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Re: Subtitles showing black band on 10 bit MKV

Post by darrenliew96 on Tue Oct 04, 2016 4:12 am

Admin wrote:Yes, no issues here even with playing a long time.

The subtitles and the video are blended inside the video renderer (when using the internal subtitle renderer of MPC-HC). This depends on the driver functioning correctly.

The Intel driver version in your log is older than the one I linked to. So certainly worth trying that.

Other options are to use a different video renderer or to switch to VSFilter for subtitles.
MPC-HC options > Playback > Output

If you right-click on mpc-hc64.exe then you should be able to select which GPU you want to use, Intel or NVidia.

Okay, now completely watch a the video without subtitle boxing problems with VSfilter.
Maybe there are some bugs with the internal subtitle renderer.

There is one more problem left, sometimes the video stream 10bit can hangs when paused too long. (audio still can continue playing)

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Re: Subtitles showing black band on 10 bit MKV

Post by Admin on Tue Oct 04, 2016 7:31 am

VSFilter blends the subtitles before it reaches the video renderer. That all happens in software and does not depend on drivers. If the bug was in the internal subtitle renderer and not in the driver, then much more people would be having the same problem as you.

One option that you can try for the pause problem:
mpc-hc options > playback > output > enable "reinitialize when changing display"

Have you tried disabling hardware acceleration? You said it was already disabled, but it was enabled in your log.

Have you also tried switching which GPU is used by MPC-HC?

Systems that have both Intel and NVidia GPUs often suffer from driver problems.

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Re: Subtitles showing black band on 10 bit MKV

Post by darrenliew96 on Tue Oct 04, 2016 1:55 pm

Admin wrote:VSFilter blends the subtitles before it reaches the video renderer. That all happens in software and does not depend on drivers. If the bug was in the internal subtitle renderer and not in the driver, then much more people would be having the same problem as you.

One option that you can try for the pause problem:
mpc-hc options > playback > output > enable "reinitialize when changing display"

Have you tried disabling hardware acceleration? You said it was already disabled, but it was enabled in your log.

Have you also tried switching which GPU is used by MPC-HC?

Systems that have both Intel and NVidia GPUs often suffer from driver problems.

ya. that log was slightly old, i did disable hw acceleration after that. Drivers were updated. So not sure what the problem is.

anyway, i had reenable HW acc for now because VSfilter does the job well.

new log:
http://pastebin.com/JC24cvvd

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Re: Subtitles showing black band on 10 bit MKV

Post by Admin on Wed Oct 05, 2016 3:02 am

One downside of VSFilter is that it renders the subtitles at the resolution of the video. So if you watch a low resolution video at full screen, subtitles are less sharp than with the internal renderer.

One other setting that you can try:
mpc-hc options > subtitles > sub pictures to buffer
Try values 0, 1, and 10

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Re: Subtitles showing black band on 10 bit MKV

Post by darrenliew96 on Wed Oct 05, 2016 2:09 pm

Admin wrote:One downside of VSFilter is that it renders the subtitles at the resolution of the video. So if you watch a low resolution video at full screen, subtitles are less sharp than with the internal renderer.

One other setting that you can try:
mpc-hc options > subtitles > sub pictures to buffer
Try values 0, 1, and 10

funny thing is when i change it to nvidia renderer with internal subtitles renderer. no black box occur, however when using Intel driver, black box occur.


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Re: Subtitles showing black band on 10 bit MKV

Post by Admin on Thu Oct 06, 2016 12:02 am

Then I would advice to keep using Nvidia. Everything points to an Intel driver bug.

I tried the file on my laptop which has an Intel GPU and it played fine too. Difference of course is that it only has one GPU, and not the exact same one as you.

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