How do gstreamer interfaces with H264 hardware encoders and creates videos ?

[Rand Graham]

Hello,

It might help if you mention which embedded board you are using.

In order to use custom hardware from a vendor such as nVidia, you would compile gstreamer plugins provided by the vendor and then specify them in your pipeline.

Regards,
Rand

From: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] On Behalf Of simon.zz at yahoo.com
Sent: Wednesday, April 25, 2018 1:01 PM
To: gstreamer-devel at lists.freedesktop.org
Subject: How do gstreamer interfaces with H264 hardware encoders and creates videos ?

Hello,

I am using an embedded board which has an hardware H264 encoder and I am testing video generation both with gst-launch and with a C++ code wrote by my self.

Comparing my code results to the gst-launch results, it is clear and obvious that gstreamer applies additional processing compared to what I get from the hardware encoder buffer.
The first obvious processing is that it generates an mp4 video, while I can only generate an h264 video, but I am not using additional mp4 demux in my code.

For example, the gst-launch resulting video image's quality it's quiet better, the video has the correct framerate rather than the video I obtain which results slightly "accelerated", and in addtition, the time-stap (minutes - seconds) is present while in the video I obtain from my C++ code it's not.

So I suspect that gstreamer doesn't use the hardware encoder.
How can I be sure that gstreamer uses the hardware encoder instead of a h264 software library and how can I know in real time what are the V4L2 settings that gstreamer applies to the encoder ?

Thanks.
Regards,
Simon


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