Video media track + video encoding

[Attila Sukosd]

Hi there,

I've been playing around with taking a video media track and passing that into the hardware accelerated video encoder. I've managed to get a version working

where I do the following:

1. Get a ready frame from the media track (VideoTrack->GetFrame())

2. Get an empty frame from the video encoder (VideoEncoder->GetVideoFrame())

3. memcpy from the ready frame into the video encoder

4. Encode (VideoEncoder->Encode())

5. Get the bitstream

and it seems to work fine. Btw, this is what the video_encode example does too.

As I've read in the documentation it should be possible to pass the PP_VideoFrame given by the Media Track directly to the video encoder,

so in that way I would get rid of that extra pesky memcpy, which takes a lot of time at 1080p@30.

Quote from the docs:

"

 * - Call GetVideoFrame() to get a blank frame and fill it in, or get a video
 *   frame from another resource, e.g. <code>PPB_MediaStreamVideoTrack</code>.
 * - Call Encode() to push the video frame to the encoder. If an external frame
 *   is pushed, wait for completion to recycle the frame.

"

As far as I understand this, I should be able to call VideoTrack->GetFrame() which should give me a VideoFrame resource,

which then I can feed directly? into VideoEncode->Encode()

However when I try that, the encoder's Encode() function tells me that the VideoFrame is an invalid resource  (PP_ERROR_BAD_RESOURCE)

Am I missing something?

Thanks a lot!

Attila