Re: [Live-devel] FFMPEG VP8/VP9 Encoding to Live555

[Ross Finlayson]

> I’d like to encode a live video stream using FFMPEG API’s using the VP8 and 
> VP9 codecs and make the stream available using Live555 as RTSP.

Yes, VP8 encoding (using FFMPEG/libvpx) and streaming (using our 
“VP8VideoRTPSink”) works fine.  (In fact, I do this in our WebRTC demo (still 
offline, unfortunately) to transcode incoming H.264, MPEG-4, or JPEG RTSP/RTP 
streams into outgoing VP8 RTP streams.)  I haven’t yet tested 
encoding/streaming VP9, but I have no reason to believe that it won’t work.


> 1.   Do I need to parse the output (similar to the H264 NAL parsing) of 
> the VP8/VP9 AVPacket?
> 2.   Do I need some type of discrete framer for VP8/VP9?
No, as long as your VP8 or VP9 encoder gives you
a) complete, discrete frames (i.e., one frame at a time; not partial 
frames or multiple frames at a time), and
b) an accurate ‘presentation time’ (i.e., setting “fPresentationTime”).
Bot are true for me for VP8 encoded using “libvpx” (I have’t yet tried VP9).  
For each frame, I just set “fPresentationTime” using “gettimeofday(), and set 
“fDurationInMicroseconds” to 100/.  (Actually, because 
I’m encoding from a live source, rather than from pre-recorded data, I could 
have just left “fDurationInMicroseconds” at its default value of 0.)

> 3.   Is libvpx just too slow for 30fps real-time encoding? (Probably 
> should have asked this first…)

This obviously depends on your computer.


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/


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[Live-devel] FFMPEG VP8/VP9 Encoding to Live555

[Weber, Patrick]

Hello Live555 community -

I'd like to encode a live video stream using FFMPEG API's using the VP8 and VP9 
codecs and make the stream available using Live555 as RTSP. I already have a 
framework in place that does this using other codecs (MPEG1, MPEG2, MPEG4, 
H264, H265). A couple questions:


1.   Do I need to parse the output (similar to the H264 NAL parsing) of the 
VP8/VP9 AVPacket? I've tried just sending the content directly to Live555 
through my FramedSource; the VP8 sort of works, but isn't something I'd show a 
client (slow-arriving frames, dropped frames, etc). The VP9 doesn't work at all.

2.   Do I need some type of discrete framer for VP8/VP9?

3.   Is libvpx just too slow for 30fps real-time encoding? (Probably should 
have asked this first...)

Thanks in advance for any help you might provide!

- Pat Weber
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