[FFmpeg-user] Lipsync of a UDP stream

[Jan Ceuleers]

On 20/02/2023 19:15, Jan Ceuleers wrote:
> Dear list,
> 
> New ffmpeg user.
> 
> I am currently using the following incantation to receive an H.264 stream:
> 
> ffmpeg -hide_banner -nostats -loglevel panic -async 1 -i
> udp://192.168.1.60:17001 -vcodec copy -codec:a aac -b:a 128k -f mpegts
> pipe:1
> 
> The media server ingesting the stream expects it on stdin, as you can see.
> 
> The trouble is that audio is about half a second late relative to video,
> and I'd like to correct that on the way into the media server.
> 
> Guidance I've found to date on this subject involves feeding the input
> into ffmpeg twice (i.e. by specifying -i twice with the same input
> file). But that can't work with a stream, since the stream arrives only
> once and can therefore also only be read once.
> 
> Any hints?
> 
> Many thanks, Jan
> 
> 
> 

Anyone?