Using -c:a copy argument results in video bitrate loss

[Omarock92]

description I'm trying to use -c:a copy as a ffmpeg argument to copy the source audio bitrate (works), but it's resulting in massive loss in video bitrate compared to using no arguments.

system Blur version (e.g. 1.8): 2.42 OS (e.g. Windows 11): Windows 11

steps (optional) Set -c:a copy as ffmpeg filter in advanced settings.

screenshots (optional) Screenshots if they help describe the issue.

[f0e]

are you using "custom ffmpeg filters"? if so, i suggest going into your config folder and modifying presets.cfg instead. you can create a new profile copying whatever base one you want to use and add in -c:a copy there. i should probably add a warning below the custom ffmpeg filters area, but yeah - if you use that it'll override every ffmpeg option, so all the quality stuff i do too. that means it'll be using the default ffmpeg options for quality, which suck.

[Omarock92]

Hi f0e, thanks for the response. I tried adding this to presets.cfg:

custom: -c:v libx264 -c:a copy -preset veryfast -crf {quality}

Was able to select the preset and save the config in Blur but I'm still getting the default audio bitrate.

I tried -c:a aac -b:a 320k as well but same results.

[github-actions[bot]]

This issue has been automatically marked as stale due to inactivity. It will be closed soon if no further activity occurs.

[Omarock92]

Bump, it's still an issue.