Opened 15 years ago

Closed 15 years ago

Last modified 15 years ago

#523 closed defect (invalid)

ATI xv playback has messed up colours (looks like red/blue inversion or similar)

Reported by: mark-clist@… Owned by: Isaac Richards
Priority: minor Milestone: unknown
Component: mythtv Version: head
Severity: medium Keywords: ati xv colors colours
Cc: Ticket locked: no


Colours are roughly red->blue, blue->red. They certainly seem to be swapped on the OSD.

It looks like the xv surface is being fed data in the wrong pixel format, although I haven't figured out quite why yet. The I420 format is being used (although if I change the preferences in the code to YV12 the results are basically the same). mplayer handles xv output fine so I don't think it is an ATI driver bug (xfree, ati proprietary driver driver 8.18.6).

Any pointers and I'll happily have a go at debugging this.



Change History (4)

comment:1 Changed 15 years ago by danielk

You should look at: VideoOutputXv::PrepareFrameXv?(VideoFrame? *frame) VideoOutputXv::InitXVideo() OSDSurface::BlendToYV12(unsigned char *yuvptr) const

Also has a run down of the various popular hardware pixel formats. It is possible that the ATI card is using some other planar format like YCrCb which uses the same intensity plane but completely different color planes. MythTV currently only supports I420 and YV12 for XVideo; so you either want to get that by modifying InitXVideo or add another format converter to PrepareFrameXv?().

comment:2 Changed 15 years ago by bjm

Resolution: invalid
Status: newclosed

Ask user questions on the mailing lists or find any of the numerous answer in the archives about the Xv "hue" settings.

comment:3 Changed 15 years ago by danielk

(In [7570]) References #523.

This commit adds printing of the FourCC codes of the XVideo surfaces when "-v playback" is enabled. It als adds the IYUV planar format to the list of accepted formats; IYUV is bit equivalent to the I420 format, so we just treat it as if we had seen a I420 id.

mark-clist AT, can you attach the FourCC codes it prints out for your ATI card?

Look for "XVideo Format" in the output..

comment:4 Changed 15 years ago by anonymous

My apologies, it appears to expect a default hue of 50%.

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