When using complex GStreamer bins such as encodebin or encodebin2, hardware acceleration is abstracted to the user and automatically selected to achieve the best level of performances.
Here is an example with a local encoding of a 10 s video test pattern in VP8 at 30 fps (300 frames):
gst-launch-1.0 videotestsrc num-buffers=300 ! video/x-raw, width=640, height=480, framerate=30/1 ! encodebin profile="video/x-vp8" ! matroskamux ! filesink location=v_vp8_640x480_30fps.webm
[...]
Got EOS from element "pipeline0".
Execution ended after 0:00:01.229040368
[...]
Play back the file to check the encoded content:
gst-play-1.0 v_vp8_640x480_30fps.webm [...] 0:00:10.0 / 0:00:10.0 Reached end of play list.
Here is another example with a local encoding of a 10 s video test pattern in H264 at 30 fps (300 frames):
gst-launch-1.0 videotestsrc num-buffers=300 ! video/x-raw, width=640, height=480, framerate=30/1 ! encodebin profile="video/x-h264" ! qtmux ! filesink location=v_h264_640x480_30fps.mp4
[...]
Got EOS from element "pipeline0".
Execution ended after 0:00:01.125719575
[...]
Play back the file to check the encoded content:
gst-play-1.0 v_h264_640x480_30fps.mp4 [...] 0:00:10.0 / 0:00:10.0 Reached end of play list.
 Information
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| Note that encoding is done as fast as possible, about 1.2 s here but play back of encoded content well shows 10 s of videos played meaning that the framerate information is well considered while encoding. |
| Information
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| More information related to video encoding can be found in the article V4L2 video codec overview. |