[libav-devel] H264 encoding issues on iOS using version 7:3.2.12, but not 6:11.12

Luca Barbato lu_zero at gentoo.org
Sat Nov 3 19:15:41 CET 2018


On 02/11/2018 16:47, Chad Phillips wrote:
> I run videoconferences via FreeSWITCH (https://freeswitch.com), which
> provides H264 decoding/encoding via a wrapper module around libav. H264 is
> a requirement for iOS access to these videoconferences, as that's the only
> WebRTC codec it supports.
> 
> Upon upgrading from Debian Jessie to Debian Stretch, H264 encoding of
> outbound video to iOS devices no longer works properly, either not sending
> any video packets at all, or when it does, with a lot of delay (4-5
> seconds) and freezing.
> 
> Since I compile FreeSWITCH from source, and am running the exact same code
> base on Jessie and Stretch, I suspect the issue is due to a change in
> packages FreeSWITCH depends upon. Since libav is the package FreeSWITCH
> leverages to perform the transcoding, and the package versions differ, it
> seems a good place to start looking for the issue. Here are the version
> differences between Jessie and Stretch:
> 
> JESSIE:
> Package: libavcodec-extra-56
> Version: 6:11.12-1~deb8u1
> 
> STRETCH:
> Package: libavcodec57
> Version: 7:3.2.12-1~deb9u1
> 
> Have there been any API or configuration changes between these versions
> that might explain the issue I'm experiencing?

One is libav, the other looks like is FFmpeg.

> Also, if anyone believes they can diagnose and solve this issue directly,
> I'd be open to paying for help.

I would suggest you to install the current libav and see if the problem 
persist.

lu


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