2018-02-15 21:30 GMT+01:00 Townson, Andrew E <[email protected]>:
> According to the ffmpeg documentation the AC-3 encoder has options to access > all Dolby metadata per the Dolby Metadata Guide link available on > ffmpeg.org. This is true for all Dolby metadata except the Dynamic Range > Compression (DRC) profile selection. We are experiencing volume > discrepancies from set top boxes while playing content encoded from ffmpeg. > We also use Minnetonka’s Surcode for Dolby Digital 5.1 AC-3 encoding > software. It does allow the selection of a DRC profile and there are no > audio discrepancies as seen with ffmpeg. Is this an option that can be added > or can someone offer a solution to this issue? Looks like a question for the FFmpeg user mailing list. > First pass – ouput is parsed as $loudnorm variable with properties: > > ffmpeg.exe -i input.wav -vn -af "loudnorm=print_format=summary" -f null – > > Second pass: > > ffmpeg.exe -i input.wav -vn -c:a ac3 -ac 2 -b:a 192k -ar 48000 -af > "loudnorm=I=-24:offset=$($loudnorm.Target_Offset_LU):linear=true:measured_I=$($loudnorm.Input_Integrated_LUFS):measured_TP=$($loudnorm.Input_True_Peak_dbTP):measured_LRA=$($loudnorm.Input_LRA_LU):measured_thresh=$($loudnorm.Input_Threshold_LUFS)" > -dsur_mode 0 -dialnorm -24 -y output.ac3 Complete, uncut console output missing. > The contents of this e-mail message and > any attachments are intended solely for the > addressee(s) and may contain confidential Please remove this from emails sent to a public mailing list. Carl Eugen _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
