[FFmpeg-devel] [PATCH 1/2] avcodec/vaapi: slice_vertical_position starts from zero for the second field

[Xiang, Haihao]

I may confirm that the error is returned from the old version of libva and vaapi
driver w/wo this patch, the command below works well for me if using the new
version of libva and vaapi driver.  

Thanks
Haihao


> Is your VAAPI library and VAAPI driver new enough? You need at least
> libva-2.1.0 (VA-API version 1.1.0) and intel-vaapi-driver-2.1.0 for
> interlaced VC-1 decoding. From the output, I think you are using an
> older version and the error is just the libva library bailing out for
> not supporting interlaced VC-1.
> 
> 
> Regards,
> Jerome
> 
> > are these 2 patches enough or something else ?
> > It feels like iam missing something but
> > 
> > i tried
> > ./ffmpeg -hwaccel vaapi -i SA10180.vc1 -pix_fmt yuv420p -f framecrc
> > crcpatch12
> > 
> > but ffmpeg spews errors at me:
> > 
> > ibva info: VA-API version 0.39.0
> > libva info: va_getDriverName() returns 0
> > libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
> > libva info: Found init function __vaDriverInit_0_39
> > libva info: va_openDriver() returns 0
> > Stream mapping:
> >   Stream #0:0 -> #0:0 (vc1 (native) -> rawvideo (native))
> > Press [q] to stop, [?] for help
> > Output #0, framecrc, to 'crcpatch12':
> >   Metadata:
> >     encoder         : Lavf58.17.100
> >     Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 720x480 [SAR
> > 1:1 DAR 3:2], q=2-31, 103680 kb/s, 25 fps, 25 tbn, 25 tbc
> >     Metadata:
> >       encoder         : Lavc58.20.102 rawvideo
> > [vc1 @ 0x3d430c0] Failed to end picture decode issue: 23 (unknown libva
> > error / description missing).
> > Error while decoding stream #0:0: Input/output error
> 
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