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jgh- / VideoCore-Inactive

*No longer in development* Please see https://github.com/unpause-live/SwiftVideo
MIT License
1.48k stars 538 forks source link

Audio static appears while streaming #168

Open FoodworksTeam opened 9 years ago

FoodworksTeam commented 9 years ago

I am working on a concert live streaming iOS app for concertwindow.com. VideoCore has been great for us. One small drawback has been audio static during broadcasts.

Here are some details: It does not appear to be related to the amplitude of the audio coming in, or the length or broadcast. It has happened in the first 5 minutes, and at the end of 2 hour broadcasts. The static seems to come and go at random, usually for a fairly short length of time (~2 minutes). We are using a Wowza server and have never had issues with audio static while using our browser based broadcaster. The static does not appear to be related to the network quality of the phone. The video quality is still usually very good when the static appears, and does not change.

The static would not be a big deal for a video chatting service, but has a bigger impact on us because we are working with music.

It would be super helpful to know if you have seen this before with VideoCore, or if you have any ideas. We tried to exhaust the possible causes on our end and haven't been able to come up with a solution or recreate the static.

Thanks so much for your time and working on VideoCore!

nickatynot commented 9 years ago

I encountered audio static/distortion when trying to compress audio below 128k, or was it 96k?

tomerhatav commented 9 years ago

@IchabodDee Did you found a solution? I also have this problem, random crackling noises. I'm using nginx-rtmp module

My audio bitrate is 96kbps I'm using this directive:

hls_sync

Syntax: hls_sync time Context: rtmp, server, application

Sets HLS timestamp synchronization threshold. Default is 2ms. This feature prevents crackling noises after conversion from low-resolution RTMP (1KHz) to high-resolution MPEG-TS (90KHz).

hls_sync 100ms;

Whatever value I use, the crackling noises is still appearing from time to time.

I'm also streaming from android but never had this problem, only on IOS.

Thank you.

jatindaveifuturz commented 7 years ago

@nickatynot @tomerhatav Did you found a solution? for audio Crackling