I guess my understanding of where DRC should be set is based on some assumptions on how it is implemented. Your explanation sounds reasonable. I will have to do some research myself to see if I can use this metadata feature to reduce how much we need to compress our signal.
Zach On Mar 26, 2015 7:51 AM, "Wiebe Cazemier" <wi...@halfgaar.net> wrote: > > ----- Original Message ----- > > From: "Zach Swena" <zcybercomput...@gmail.com> > > To: "FFmpeg development discussions and patches" < ffmpeg-devel@ffmpeg.org> > > Sent: Thursday, 26 March, 2015 3:34:22 PM > > Subject: Re: [FFmpeg-devel] Default dynamic range compression on AC3 > > > > Something to keep in mind, AC3 is a broadcast format, so it makes sense to > > have range compression built in because many listeners are viewing on TV > > sets with limited range capabilities. I wasn't aware of this option, but > > will probably end up using it for a program I am making. I don't care > > about the default value, as long as I can change it and the feature and > > default value get proper documentation. That is just a bit of background > > on why the AC3 spec has this feature. Theoretically it should be turned > > off at the decoder if connected to proper speakers though. > > This was brought up in the Kodi discussion as well. I haven't answered there (yet), but it has been my experience that TV networks already apply a whole bunch of compression on the stream itself, outside of the meta data. Disabling DRC doesn't help in preventing horrible compressed sound quality. > > In any case, the use of AC3 for broadcasting shouldn't mean that DRC is on by default. Settop etc boxes that want this should turn it on themselves, not rely on a library that performs it with the developer using ffmpeg not even knowing about the existence of it. And the developers that do know, will simply set drc_scale. > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
