Is there a way using the Premiere / MediaEncoder plugin to use CBR AAC using the FFMpeg encoder? It seems to always produce VBR audio even if the video codec is set to CBR. For example, on one project the highest audio bitrate it will produce is 232Kb/s (according to FFmpeg -i) if you set it any higher than 192k.
The issue is our master control has a QC check that requires the audio bitrate to be > 300Kb/s and if the metadata says anything less it will fail the asset right away.
According to this, AAC by default (-v 0) will be CBR:
Something else is going on here then… no matter what I set it to, any bitrate greater than 192Kb/s will result in the audio bitrate being 232Kb/s.
According to ffmpeg -I:
"Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 232 kb/s (default)"