And, how to use twolame? Can towlame support to make mp2?
2014-09-25 20:52 GMT+08:00 linxs <[email protected]>: > > I had another test using Edius. > I found that Edius can encode mp2 audio by the same param(bitrate, > samplerate....) containing high pitch audio. > So I think ffmpeg should be able to do the same thing. > I analyzed mp2 made by ffmpeg. I found that sine wave whose frequency > large than 14500HZ is eliminated. > Is there any way to keep the high pitch audio in mp2 made by ffmpeg? > Thanks! > > > > > > 2014-09-25 19:46 GMT+08:00 Moritz Barsnick <[email protected]>: > >> On Thu, Sep 25, 2014 at 17:42:46 +0800, linxs wrote: >> > How can I use mp2 to encode high pitch audio? >> >> Whether a 19 kHz tone is properly encoded or not certainly depends on >> the implementation of the psychoacoutic model. The library twolame >> (which is not the ffmpeg native implementation you're using!) seems to >> have its lowpass somewhat below 19 kHz in some models: >> >> >> http://www.hydrogenaud.io/forums/index.php?s=&showtopic=52056&view=findpost&p=467160 >> >> I couldn't find any proper documentation on that and don't care to read >> the sources. Something similar is likely valid for ffmpeg's native mp2 >> encoder, even though it doesn't seem to support more than one model. >> (The source says it doesn't even have one. ;-)) How and whether the >> band around 19kHz is encoded I do not know. Perhaps not at all. >> >> Moritz >> >> P.S.: I don't have a dog for testing the resulting file. ;-) Audacity >> is nice though... >> _______________________________________________ >> ffmpeg-user mailing list >> [email protected] >> http://ffmpeg.org/mailman/listinfo/ffmpeg-user >> > > _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
