[FFmpeg-user] [FFmpeg-devel] Fwd: ffmpeg live streaming

[Reuben Martin]

On Friday, March 18, 2016 12:52:17 AM Kamal Bijlani wrote (to the developer 
list:
> Hello ffmpeg developer,

This isn’t really the type of topic for the developer mailing list, you 
probably won’t get much a response to this sort of question there. The ffmpeg-
users mailing list is more appropriate for this.

> We are currently using Adobe Media Server and Red5 for streaming, Adobe
> Flex and encoding h.264. Now, we would like to improve audio/video quality,
> and have multi-bit rate with low latency.
> 
> If possible, we would like to consult with you. Here are some issues:
> 1. our existing audio/video in h.264 adobe flex RTMP encoding is pixelating
> during movements.

This has nothing to do with ffmpeg.

> 2. when encoding with ffmpeg there is latency of 3 to 5 seconds . how to
> reduce latency for live interactive sessions?

This is normal. There are ways to reduce it, but at the expense of quality. 
For live interaction you would be best to use a DSP based hardware encoder 
decoders that can deliver <50ms encoding latency. (and solutions like are not 
cheap if high quality is desired) Ffmpeg, or more accurately libx264, is just 
not designed with that type of low latency as it’s primary goal.

> 3. we are having some issues when we use the AAC audio and 2 audio inputs.
> For AAC audio we get more latency. For 2 audio inputs, it seems to get
> unstable.
> 

If audio is sourced from a device separate from the video device (i.e. They do 
not share the same hardware clock) they will suffer from clock drift which 
increases latency and causes other problems.

> We would like to phone/skype/talk with you immediately, and get some help.
> We would like to know your rates. thanks.
> Warm Regards,
> Kamal, Sukanya, Raji