On Mon, 2005-04-25 at 23:00 +0100, Terry Barnaby wrote:
I don't think there is an issue with closing and re-opening the context in XvMC VLD. So I am note sure your channel change system will affect the problem.
There appears to be a more fundemental problem in avcodec after a channel change. The XVMC_VLD_field_end() function is continuely called without any XVMC_VLD_field_start() calls. It appears that avcodec is trying to decode garbage ....
Hmm, do you know who wrote the VLD part of avcodec?
Yes, it was me :)
If the DVB-T frond end is set to PS rather than TS mode then the channel change happens and XvMC VLD carries along quite happily without any "This context does not own decoder!" messages. The Vido output does fall over with a " Timed out waiting for free video buffers" after a bit though. There are other MythTv issues with av_remove_stream() could this be something to do with the problem ....
Well we're not calling av_remove_stream right now, we just create a new decoder in avformatdecoder and leak a some memory. This was a quick-n-dirty fix for some DVB channel changing problems, I plan to fix this when I change the channel change behaviour. It probably makes sense to hold off any VLD changes until the MythTV behaviour is fixed. Gimme a week or so.
If you look at my "bug1" log from a few emails back, you will see that "something" is calling av_remove_stream() on a channel change when TS streams are in use. av_remove_stream() does not appear to be called when PS streams are in use ... Maybe the "DVB channel changing problems" you refer to is due to some problem with av_remove_stream() and the VBuffer system ? I don't intend to make any VLD changes but will investigate a little more ...
Good luck
Terry
-- Daniel
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