On Sat, Jul 09, 2022 at 08:45:31AM +0200, Steve Lhomme wrote: > Patch attached in the email. > > In some cases, the submit packet can result in configurations changes of the > hardware decoders. The previous HW context is then freed and a new one > created. That context is supposed to move up to the main context and the > other threads. > > It appears that when more than 2 frame threads are involved, the new context > doesn't move in the right place (or rather at the right time). And it can > create a crash when reusing the old HW context. This patch fixes the issue I > could reproduce in VLC with DXVA decoding. > > I have no idea if this is correct or the side effects induced by this. It > seems the right thing to do. Keeping the previous call exhibits the issue. > It seems odd the other existing thread context are not updated with the > current hwaccel_priv_data. But maybe they are updated later from the "main" > thread context, in which case this patch seems solid.
> pthread_frame.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > 2274e52382008f403c7bf52f76d608d2a56ef859 > 0001-avcodec-pthread_frame-update-the-main-avctx-from-the.patch > From e8abeeff92f5d7b3b553acdb7595d40153cbec1e Mon Sep 17 00:00:00 2001 > From: Steve Lhomme <rob...@ycbcr.xyz> > Date: Fri, 8 Jul 2022 11:49:27 +0200 > Subject: [PATCH] avcodec/pthread_frame: update the main avctx from the current > ThreadContext > > After a submit_decoder() the hwaccel_priv_data may have changed in that avctx. > > Doing it after the "next available frame" loop will likely point to the > hwaccel_priv_data from another PerThreadContext which had the old value which > might have been freed, if the submit_decoder() resulting in a format change. > --- > libavcodec/pthread_frame.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) It would be nice if a solution to this would make it in 5.1 thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB In fact, the RIAA has been known to suggest that students drop out of college or go to community college in order to be able to afford settlements. -- The RIAA
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