[FFmpeg-user] No size progress information available when using tee muxer

Carl Zwanzig cpz at tuunq.com
Fri Jan 22 20:13:40 EET 2021

On 1/21/2021 11:53 AM, marcus.fehde at gmx.net wrote:
> But I need to stream the encoded stream via UDP simultaneously. For this
> purpose I use the tee muxer:
> ./ffmpeg -i c:\test.mp4 -vcodec libx264 -acodec aac -f tee -map 0:v -map 0:a
> "[f=mpegts]udp://|output.mp4"
> This works well except that the size information is N/A.

It's probably reporting the size of the stream, try reversing that and the 
filename ("output.mp4\|[f=mpegts]udp://"). Also, check out 
the -progress option which, at least on *nix, can point to a pipe. (There's 
also a stackoverflow article on this.)


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