avdec_h264 is not copying metadata to the outputbuffer

[sudipj]

I faced this issue earlier, the only difference being that I added video
meta-data into hardware decoder plugin (vpudec) instead of h264parse.  I
don't have the proper clue of the real issue, having a consumer of the
output buffer downstream avoids it.  Here are some results that could help

.. h264parse ! vpudec ! videoconvert ! fakesink - error

.. h264parse ! vpudec ! videoconvert ! video/-raw, format =I420 ! fakesink
-the output of vpudec is NV12 format. Force video convert to avoid bypass
mode - No error

.. h264patrse ! vpudec ! videorga ! fakesink - No error , videorga is
hardware post process element, checks for the video meta data and copies to
the output buffer, so I don't get the issue and is my default use case. I
didn't investigated further.

You could give a similar try to your pipeline, though I am not sure as the
the meta data is added in h264parse element. Or just try this if the same
error comes
gst-launch-1.0 filesrc location=input.ts ! tsdemux ! h264parse ! fakesink

Then you could keep adding element..

Regards,
Sudip





On 24 November 2016 at 14:38, parithi [via GStreamer-devel] <
ml-node+s966125n4680853h74 at n4.nabble.com> wrote:

> Sudip,
>
> Even I don't have any problem running this pipeline without meta data(with
> tag "video"). But problem arises when I add meta data with ouput buffer of
> h264_parse. The decoder element should copy this meta data on it's output
> buffer and pass it to downstream element.
>
> avdec_h264 is receiving all meta data. I've checked this. Problem arises
> when it tries to add the meta data to its output buffer. The pipeline
> crashes at gst_buffer_add_meta(), since the buffer passed from avdec_h264
> is not in writable mode.
> call stack:
> --------------------------------
> #2 gst_buffer_add_meta
> #3 gst_buffer_add_h264_meta
> #4 gst_h264_meta_transform
> #5 foreach_metadata
> #6 gst_buffer_foreach_meta
> #7 gst_video_decoder_finish_frame
> #8 gst_ffmpegviddec_frame
> ----------------------------------
> If the meta tag is "video" the frame work will do the copying, otherwise
> we have to retrieve it from input buffer and append it to the outut buffer.
> I tried both ways, but the behaviour is same.
>
> Please let me know if you have any suggestion to resolve this issue.
>
> Regards,
> Parithi
>
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