Bug#825140: vlc: freezes playing and fast-forwarding MKV File

[Sebastian Ramacher]

Hi

On 2016-05-24 02:49:47, Maria wrote:
> whenever I try to play a MKV File (MPEG-4p10/AVC/h.264 Codec ID:
> V_MPEG4/ISO/AVC), it starts showing the first one or two seconds, then
> switching black. The time counter still moves forward and so does the sound as
> it is in a different track (Spur) and therefore working. When I fast-forward to
> a later part of the video it shows the time of the part where I first clicked
> but then nothing happens anymore. Neither the sound nor the time counter are
> working. The menues are responding but hitting quit vlc in the menue or Ctrl+q
> has no effect. Only possibillity to end is to kill vlc.
>
> This happens every time.
>
> I tried the same Video with Dragon Player 15.08.3 and it shows video and plays
> audio correctly. But there the video overlaps the screen somehow making it
> impossible to use menues as these are overlapped by the video.
>
> VLC also refused to play other MKV Files before.
>
> It plays FLV Files but refuses to adapt the size of the video (as they have low
> resolution it results in a tiny video window even in fullscreen mode).

...

> libva info: VA-API version 0.39.0
> libva info: va_getDriverName() returns 0
> libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
> libva info: Found init function __vaDriverInit_0_39
> libva info: va_openDriver() returns 0
> [00007f99f4001208] vdpau_avcodec generic debug: video surface limits: 1920x1080
> [00007f99f4001208] vdpau_avcodec generic debug: decoder profile limits: level 51 mb 16384 2048x2048
> [00007f99f4001208] core generic debug: using hw decoder module "vdpau_avcodec"
> [00007f9a14c11108] avcodec decoder: Using OpenGL/VAAPI/libswscale backend for VDPAU for hardware decoding.

Ah, as suspected: that is libvdpau-va-gl1's fault. You can either force vlc to
use VA-API for hardware decoding or remove libvdpau-va-gl1.

The remaining question is: if you remove libvdpau-va-gl1 does the other issues
vanish as well?

Regards
--
Sebastian Ramacher

[Maria]

Dear Sebastian,

a day (and a sleep) later I found out how to solve the new problems:

I had to delete the config file in ~/.config/vlc manually.

The setting Interface>Main Interface>Interface-Modul=Qt-Interface seems
to be broken and leads to an unstartable installation until you manually
delete the config file.

I realized that the graphical problems were no consequence of
deinstalling libvdpau-va-gl1. They existed before in Dragon Player as
well, I just never tried to fullscreen Dragon Player before and vlc did
not play it.

Nonetheless these were solved using Video>Ausgabemodule(output
modules)>Videoausgabemodul="OpenGL GLX Videoausgabe (XCB)" or
"X11-Videoausgabe (XCB)" while the setting OpenGL... in combination with
Video>Ausgabemodule>OpenGL>OpenGL-Erweiterung="EGL Erweiterung für
OpenGL" is smoother than automatic and a little sharper than X11-Vid...
on my computer.


A last question I do have: When I understood the package descriptions
etc. right then the problems are lying in playing the video over the
hardware? How do I find out wether (or which) driver is not working or
if this is due to faulty hardware?

Thanks alot for your help - I am really relieved right now.
Maria

[Sebastian Ramacher]

Hi Maria,

sorry for the delay.

You have an Intel GPU, right? Which generation? Do you use the -intel driver for
X or the mode setting driver?

Regards

>
> Thanks alot for your help - I am really relieved right now.
> Maria

--
Sebastian Ramacher