v4l2h264dec gstreamer 1.18.4 not accepting stream

[gstreamer at iktek.de]

Currently I'm wondering about 3 things:

1: Is it really the colorimetry that is not accepted?
I don't see the "ERROR: from element /GstPipeline:pipeline0/v4l2h264enc:v4l2h264enc0:
Device '/dev/xxx' does not support xxx colorimetry" message here. I was assuming into the direction of "baseline" vs "constrained-baseline" because v4l2h264enc is only returning baseline in accepted caps.

2: Can one give me an idea how to gain more logging information about which capability is causing the "non-acceptance"? Would it be a deal to generally having this information in the gst-error-log?

I'll try to dig in further meanwhile but as I'm not a gstreamer-expert I first have to find the file where it's worth starting to dig into the code... :-)

3: Is there a simple solution to just override the caps in the pipeline only "downstream" to pretend to have a different colorimetry or profile.. If so I would maybe findout more which of the caps is
not accepted...

Regards Pascal

Am 04.03.22 um 14:52 schrieb Nicolas Dufresne via gstreamer-devel:
Am 04.03.22 um 14:52 schrieb Nicolas Dufresne via gstreamer-devel:

> Le vendredi 04 mars 2022 à 11:21 +0100, Pascal Speck via gstreamer-devel a
> écrit :
>>
>> 0:00:03.690824695  1500  0xffa000 INFO                    v4l2 gstv4l2object.c:4469:gst_v4l2_object_probe_caps:<v4l2h264dec0:sink> probed caps: video/x-h264, stream-format=(string)byte-stream,
>> alignment=(string)au, level=(string){ 1, 1
>> b, 1.1, 1.2, 1.3, 2, 2.1, 2.2, 3, 3.1, 3.2, 4, 4.1 }, profile=(string){ baseline, main, high }, width=(int)[ 48, 1920 ], height=(int)[ 16, 1088 ], colorimetry=(string){ bt709, bt601, smpte240m,
>> 2:4:5:2, 2:4:5:3, 1:4:7:1, 2:4:7:1, 2:4:12
>> :8, bt2020, 2:0:0:0 }, parsed=(boolean)true
>>
>> I can see that with the old setup the caps seem very similar but are accepted:
>>
>> /GstPipeline:pipeline0/GstH264Parse:h264parse0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, width=(int)800, height=(int)600, framerate=(fraction)0/1,
>> interlace-mode=(string)progressive, chrom
>> a-format=(string)4:2:0, bit-depth-luma=(uint)8, bit-depth-chroma=(uint)8, parsed=(boolean)true, profile=(string)constrained-baseline, level=(string)3.1
>>
>> Does someone have an Idea where to dig further?
> 
> Looks quite similar to:
> 
> https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1056
> 
> We *just* need someone with free time to fix it.
> 
> Nicolas