The problem is introduced using FFMPEG to record PGM out and I noticed that, trying to playback the resulting file with vlc.
Endless wait and no playback.



I fix the file using this command:

ffmpeg -i tg_no_good.mp4 -c:v copy -c:a copy tg_good.mp4


From a brief analysis, seems vmix marks the video file like it was VBR but instead it is CBR.


v1p3r@viperbox:~/Video/temp$ mediainfo --fullscan 'tg_good.mp4' | grep 'mode'
Frame rate mode : CFR
Frame rate mode : Constant
Bit rate mode : CBR
Bit rate mode : Constant
Compression mode : Lossy
Compression mode : Lossy
v1p3r@viperbox:~/Video/temp$ mediainfo --fullscan 'tg_no_good.mp4' | grep 'mode'
Overall bit rate mode : VBR
Overall bit rate mode : Variable
Frame rate mode : CFR
Frame rate mode : Constant
Bit rate mode : VBR
Bit rate mode : Variable
Compression mode : Lossy
Compression mode : Lossy

I can provide both files to analyze if needed.

PS: if i use the "internal" mp4 encoder, outputted video files are perfect playing, but quality seems a bit lower then the one produced by the "fixed" ffmpeg.