00:00 <videomouse> hoonestly i fuound it hard to find clear documentation to set all these things and i'm not a programmer to read source

00:00 <videomouse> like hevc_vaapi vs hevc_qsv, commands seems to change

00:00 <videomouse> and examples on the internet span years so i get conflicting answers

00:01 <BtbN> Just refer to ffmpegs own help output

00:07 <videomouse> there's nothing in hevc_qsv help that says how to set various bit control rate modes The words qvbr or global_quality don't appear anywhere on https://ffmpeg.org/ffmpeg.html unfortunately this is what i struggle with. i had to google to even find how to set a "CRF equivalent" mode for the quicksync encdoder and that's when i learned about "global_quality" as a parameter =\

00:08 <BtbN> global_quality is a global option

00:08 <furq> https://ffmpeg.org/ffmpeg-all.html

00:08 <furq> or in this case https://ffmpeg.org/ffmpeg-codecs.html

00:08 <BtbN> annoyingly, there really is no way to know which encoder uses which global option

00:08 <furq> i'm not saying it's particularly clear in there but it is in there

00:08 <furq> because of that

00:09 <BtbN> https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/qsvenc.c#L643

00:10 <videomouse> i think ffmpeg is an amazing tool, i just find trying to understand it and research all the documentation and look for help on google is a lot of work i've struggled with

00:10 <BtbN> Well, and instead you pick something even more fiddly?

00:11 <BtbN> So for QVBR mode, you want to actually NOT set -b, but must set -maxrate, and -global_quality

00:11 <BtbN> That's how I read that if/else chain

00:11 <BtbN> and also not enable look_ahead

00:12 <BtbN> oh wait, I read that wrong

00:12 <BtbN> it goes into QVBR mode if -b, -maxrate AND -global_quality are set, and neither of look-ahead, qscale or vcm mode are enabled

00:12 <videomouse> forgive me, i appreciate the help. i just wanted to ensure my filter structure was correct for piping putput

00:13 <BtbN> Apprently Intel thought not to exposed the lower level rate control modes to users

00:13 <BtbN> Cause iirc this code is from Intel-Devs themselves

00:13 <BtbN> You are just supposed to set the desired bitrate, and it'll figure out the right mode

09:24 <jpsollie> hello everyone, does anybody know a similarity index for audio? I'm trying to sort out my audio files, but in case of not-binary-exact, it would be nice to have something like ssim (for video) to decide whether it's the same song or not. is there something like that?