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v4l2videodec: fix src side frame rate negotiation

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Negotiating v4l2h264dec ! v4l2h264enc transcoding pipelines fails in
case the encoder does not accept framerate=(fraction)0/1.
The acquired caps used for downstream negotiation are determined from
gst_v4l2_object_acquire_format(), which sets the GstVideoInfo::fps_n
and ::fps_d fields to 0.
To fix this, copy the frame rate from the sink side.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/882>
This commit is contained in:
Philipp Zabel 2021-02-24 13:25:43 +01:00 committed by Philipp Zabel
parent 1257e50d49
commit e885e0e1d7
1 changed files with 4 additions and 0 deletions
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4
sys/v4l2/gstv4l2videodec.c
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@ -697,6 +697,10 @@ gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
if (!gst_v4l2_object_acquire_format (self->v4l2capture, &info))
goto not_negotiated;
/* gst_v4l2_object_acquire_format() does not set fps, copy from sink */
info.fps_n = self->v4l2output->info.fps_n;
info.fps_d = self->v4l2output->info.fps_d;
/* Create caps from the acquired format, remove the format field */
acquired_caps = gst_video_info_to_caps (&info);
GST_DEBUG_OBJECT (self, "Acquired caps: %" GST_PTR_FORMAT, acquired_caps);