Upgrade to FFmpeg 6.x

[tianlinzx]

Is your feature request related to a problem? Please describe.
When will you upgrade to FFmpeg 6.x ?

[JohnRSim]

We cannot upgrade to n6.0 as ffmpeg bin only supports multithread at the moment.
in the docker file..

[tianlinzx]

@JohnRSim Looks like the ffmpeg 7.0 supports multithread console. Would you please consider upgrade to 7.X ?