[Bug 50239] Multiple 32-bit applications have slow or lagging video due to slow YUV -> RGB conversion in GStreamer (The Legend of Heroes: Trails in the Sky, Blazblue Centralfiction)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50239

Zebediah Figura <z.figura12 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|The Legend of Heroes:       |Multiple 32-bit
                   |Trails in the Sky Xvid      |applications have slow or
                   |movie playback lags and is  |lagging video due to slow
                   |very slow                   |YUV -> RGB conversion in
                   |                            |GStreamer (The Legend of
                   |                            |Heroes: Trails in the Sky,
                   |                            |Blazblue Centralfiction)
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
          Component|-unknown                    |winegstreamer

--- Comment #9 from Zebediah Figura <z.figura12 at gmail.com> ---
0:01:22.441406537  7455 0xf530c880 DEBUG        GST_PERFORMANCE
gstvideoconvert.c:725:gst_video_convert_transform_frame:<videoconvert3> doing
colorspace conversion from I420 -> to BGRx
0:01:22.469797927  7455 0xf530c880 LOG               GST_BUFFER
gstbuffer.c:760:_gst_buffer_dispose: release 0xe865c000 to pool 0xea29fe58

Yeah, I was afraid of something like this.

videoconvert is far too slow—28 ms per frame. It's a problem only for the
second video because it's much larger (1920x960 vs 640x320). The main reason
it's slow is that it's being done all in slow, SISD software. Normally it'd go
through SIMD via liborc—in fact, it would, in 64-bit—but the I420 -> ARGB
conversion needs more than 8 registers, and liborc can't spill them.

I think the solution is to improve liborc, either by helping it use less
registers, or by implementing spilling.

I've observed this problem in another game, Blazblue Centralfiction. In that
case the video isn't extremely slow, but it does drop many frames due to
GStreamer's internal QoS handling.

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