Pipeline not working with gdkpixbufoverlay and vaapi using JPEG 4:2:2 streams, bug #158

[Wolfgang Grandegger]

Hello,

this issue [1] is still present in 1.16.2. Any idea what the problem
could be and where to start debugging at.

[1] https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/issues/158

Thanks,

Wolfgang
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[Nicolas Dufresne-5]

Le jeudi 19 décembre 2019 à 14:20 +0100, Wolfgang Grandegger a écrit :
> Hello,
>
> this issue [1] is still present in 1.16.2. Any idea what the problem
> could be and where to start debugging at.
>
> [1] https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/issues/158

Aren't you just missing vaapipostproc after the jpeg decoder ?

>
> Thanks,
>
> Wolfgang
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> gstreamer-devel mailing list
> [hidden email]
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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[Wolfgang Grandegger]

Hello,

Am 20.12.19 um 20:00 schrieb Nicolas Dufresne:
> Le jeudi 19 décembre 2019 à 14:20 +0100, Wolfgang Grandegger a écrit :
>> Hello,
>>
>> this issue [1] is still present in 1.16.2. Any idea what the problem
>> could be and where to start debugging at.
>>
>> [1] https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/issues/158
>
> Aren't you just missing vaapipostproc after the jpeg decoder ?

As I wrote, it works with "vaapipostproc format=i420". I thin tt does
not work without "format=i420", but I need to double-check. Anyway, if I
use clockoverlay, the vaapipostproc is not necessary.

The i420 is a 4:2:0 format, while the camera sends 4:2:2. Converting to
4:2:0 means worse image quality, which is not desirable, IIUC.

Do you say, that VAAPI does not support 4:2:2? How can I find out, what
formats are supported by the VAAPI (Intel Graphics) JPGEG decoder?

Wolfgang
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[Nicolas Dufresne-5]

Le sam. 21 déc. 2019 17 h 45, Wolfgang Grandegger <[hidden email]> a écrit :

Hello,

Am 20.12.19 um 20:00 schrieb Nicolas Dufresne:
> Le jeudi 19 décembre 2019 à 14:20 +0100, Wolfgang Grandegger a écrit :
>> Hello,
>>
>> this issue [1] is still present in 1.16.2. Any idea what the problem
>> could be and where to start debugging at.
>>
>> [1] https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/issues/158
>
> Aren't you just missing vaapipostproc after the jpeg decoder ?

As I wrote, it works with "vaapipostproc format=i420". I thin tt does
not work without "format=i420", but I need to double-check. Anyway, if I
use clockoverlay, the vaapipostproc is not necessary.

The i420 is a 4:2:0 format, while the camera sends 4:2:2. Converting to
4:2:0 means worse image quality, which is not desirable, IIUC.

Do you say, that VAAPI does not support 4:2:2? How can I find out, what
formats are supported by the VAAPI (Intel Graphics) JPGEG decoder?

vaapipostproc is needed to allow cpu memory access. Normally this should not require a colorspace conversion.

Wolfgang
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