[Bug 101308] New: [DP] [HSW] Wrong video streaming behavior

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101308

            Bug ID: 101308
           Summary: [DP] [HSW] Wrong video streaming behavior
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: victor.jesusx.lopez.carrillo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 131725
  --> https://bugs.freedesktop.org/attachment.cgi?id=131725&action=edit
Adobe video speed failure

System Environment
=======
OS: Linux Ubuntu 17.04 64 bits
Kernel: 4.12.0-rc3-drm-tip-ww2-commit-187376e+
X-Org: 1.19.99.1

Regression?
=======
No

Bug detailed description
=======
Embedded content derived from Adobe products plays at a high rate of speed,
disregarding if the video has been buffered or not, it will play at high speed.

Videos have frame rate issues as they seem to get stuck momentarily (specially
with the FLV/SWF formats), the higher the resolution, the heavier the problem
(chopped playback)

Reproduce Steps
==============
Open a video (streamed or local), from 720p resolution and up

Expected Result
=============
It should play at normal speed.

Actual Result
===========
Plays intermittently at different frame rates with a regular frame drop every
one or two seconds and, in the case of FLV/SWF videos it plays at a 2X - 3X
playback rate when not chopped or stuck.

Analysis & Root Cause
===================
Possible and maybe required bottleneck detection within the graphics stack
(even per-output port display sequencing), improper buffer usage.

It may happen due to the fact of the audio clocks being misconfigured that the
video couldn't find a correct speed value to display the required amount of
textures buffered, however, this is a totally different behavior while using
x264 or other video codecs, it seems to fail only with Adobe derived video
content.

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