audio codec improving bitrate

[marcorocchini]

Hi cat, please consider my commandline

v:\automazioneclip\core\ffmpeg.exe -threads 12 -y -i "%~dp1%~n1.avi" -c:v libx264 -profile:v high422 -level:v 3 -g 33 -bf 2 -crf 22 -flags +ildct+ilme -top 1 -pix_fmt yuv422p -vf scale=interl=1:in_range=tv:out_range=tv -af "pan=stereo:c0<c0+c1:c1<c0+c1" -c:a ac3 -b:a 320k -ar 48000 -aspect 16:9 "%~n1_Mp4_PanPotYES_Remux64bit.mp4"

nut now I like to improve de audio quality bitrate codec, possibily to bring it a 516 Kb/s if possibile. How can I do? thanks

[Cornucopia]

#1. Re-encoding to lossy codec loses quality! You don't "improve" quality with higher bitrate, you only lose less quality.

#2. Ac3, like many similar cbr lossy codecs, doesn't allow just any arbitrary bitrate option. There are TIERS based usually on mod16 numbers (32, 48, 64, 96, 112, 128...). 512 is ok, but 516 is not. Then there are limits based on # of channels, and whether it is for dvd, bd, broadcast, generic, etc. 2 ch max for ac3 is likely 320kbps, which should basically be transparent compared to uncompressed.

#3. You ought to know this by now.

Scott