Re: [FFmpeg-devel] [PATCH v2 1/1] lavc/qsvdec: fix dead loop of qsv decoding

["Xiang, Haihao" <haihao.xiang-at-intel.com@ffmpeg.org>]

On Do, 2023-09-14 at 15:08 +0800, zhilizhao(赵志立) wrote:
> 
> 
> > On Sep 14, 2023, at 14:11, Xiang, Haihao
> > <haihao.xiang-at-intel.com@ffmpeg.org> wrote:
> > 
> > 
> > > This seems like a bug in libmfx/libvpl.
> > 
> > I agree there should be a bug in libmfx/libvpl, but we have to avoid this
> > dead
> > loop in FFmpeg.
> 
> Is it possible that a normal case which do take more than 500ms now break out
> early and return AVERROR(EBUSY)?

Thanks for your question. Yes, it is possible. So we can't use this way to fix
the problem. 

BRs
Haihao

> 
> On the other hand, this isn’t the only place where dead loops can happen.
> Third party encoder/decoder wrappers, especially those operating system
> framework
> wrappers (e.g., Android MediaCodec) have the same risks. Something like a
> interrupt callback in avcodec can be useful if more cases have been found. 
> 
> > 
> > 
> > > I encountered this problem in video conference scenario. Receive more over
> > > 9
> > > RTP h264 video streams simultaneously.
> > 
> > Could you file a bug to https://github.com/oneapi-src/oneVPL-intel-gpu ,
> > then
> > document this issue in your patch ? 
> > 
> > Thanks
> > Haihao
> > 
> > > 
> > > 获取 Outlook for iOS<https://aka.ms/o0ukef>
> > > ________________________________
> > > 发件人: Anton Khirnov <anton@khirnov.net>
> > > 发送时间: Tuesday, August 29, 2023 3:57:00 PM
> > > 收件人: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
> > > 抄送: tinghu3 <siriushu@hotmail.com>
> > > 主题: Re: [FFmpeg-devel] [PATCH v2 1/1] lavc/qsvdec: fix dead loop of qsv
> > > decoding
> > > 
> > > Quoting Ting Hu (2023-08-29 09:49:06)
> > > > From: tinghu3 <siriushu@hotmail.com>
> > > > 
> > > > MFXVideoDECODE_DecodeFrameAsync always return MFX_WRN_DEVICE_BUSY in
> > > > special
> > > > scenario.
> > > 
> > > "special scenario"? What special scenario? Is this documented anywhere?
> > > This seems like a bug in libmfx/libvpl.
> > > 
> > > --
> > > Anton Khirnov
> > > _______________________________________________
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