reducing publishing delay

[Gabriel T]

Hello
i usually notice a 5/6 seconds delay after a stream start to be published until it start being played on other windows. sounds like a buffer story, is there a way to reduce buffering time, on client or server ? (note that while there is this initial delay, the latency is very low once the stream started, so this part is really cool)

 

[Max]

If you mean ffmpeg, you can try to set a short GOP (K-frame interval).
For example: 48 means K frame every 48-th frame.
If FPS is 30 (30 frames per second), the K frame interval should be equal 1.5 seconds.
Shorter K frame interval should provide shorter initial delay.

 

[Gabriel T]

sorry, i should have precised its from the browser (any)

 

[Max]

Do you have the same issue with our demo page
https://wcs5-eu.flashphoner.com/demo2/two-way-streaming
Test
1. Publish stream left.
2. Play stream right.
I have about 2 seconds delay when I press Play.
Do you have 5-6 seconds delay here?

 

[Gabriel T]

yes i have more or less same delay. if i click on play immediatly when status show "published", i have this 5/6 seconds...using chrome on windows. might come from my internet, im based in thailand and my servers are in france

 

[Max]

It is 2-3 seconds for me.
Our demo server is located n Europe / Frankfurt.
You can have such initial delay when:
1) H.264 codec is used.
2) Windows 8 is used
3) There is a packet lost on the network between server and you

As an option you can switch to VP8 codec
flashphoner.properties
codecs=opus,alaw,ulaw,g729,speex16,g722,mpeg4-generic,telephone-event,vp8,h264,flv,mpv
Here we set VP8 priority.
However if you set VP8, you will have transcoding on RTMP H.264 (ffmpeg) streams. It will load server and reduce performance.