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Question by Todd Henner · Feb 17, 2010 at 04:11 PM · live streaming and encoders

RTMP to RTSP without transcode?

Hi,

Is it possible to publish a live stream with RTMP and play this same stream with RTSP without going through any transcoding (just rtmp->rtp conversion). Since ffmpeg natively supports the flash codecs most ffmpeg/libavcodecs could decode this stream theoretically and we could avoid the transcoding process.

Thanks!
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Answer by Richard Lanham · Feb 17, 2010 at 09:30 PM

Yes, take a look at this Tutorial:

http://www.wowza.com/forums/showthread.php?t=6467

Richard
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avatar image Todd Henner · Feb 17, 2010 at 05:13 PM 0
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I've been (somewhat) successful in streaming live RTMP -> RTSP, i see messages in wowza "encodeH263.framesize ...." which makes me think it's transcoding from the flash codec to H.263.

Does wowza actually transcode or is it just converting the packet format from flash to standard H.263 and not doing any transcoding?

Regards,

Todd
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Answer by Richard Lanham · Feb 17, 2010 at 11:00 PM

No, Wowza doesn't do any transcoding. You might need h.264 formatted content for what you are trying to do.

Richard
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avatar image Todd Henner · Feb 17, 2010 at 07:40 PM 0
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Thanks, that clears it up. I did switch the flash encoder side to h264 and sure enough rtmp->rtsp is working properly now. The fact there is no transcoding explains why the 'default' sorensen encoder doesn't work very well for rtmp->rtsp since it's only kinda h.263.

Thanks!!

Todd

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