Bad sound with sample encoded with opus 2017-09-03 21:49:32 Problems with sample encoded with opussource1 (mp3@256): Danny Keith - Keep On Music.mp3 fragment* [0:35-0:53]source2 (opus@160): https://www.youtube.com/watch?v=qlugmsrLvpI [0:44-1:02]mp3@256 -> opus@48, uses higher bitrate (~60 on this part) but still sounds badmp3@256 -> opus@64, uses 80kbps on problematic sample, sounds better but still not goodmp3@256 -> opus@80, uses 105kbps on problematic sample, sounds reasonableopus160 -> opus@80, still seems a bit bad, maybe acceptableIn the past I found out same sample/instrument in different songs with same problem.Opus uses high bitrate for this sample but still sounds bad. Either should improve encoding of this sample/instrument, or raise bitrate even more.* - cut from full song using mp3directcut (lossless)
Re: Bad sound with sample encoded with opus Reply #1 – 2017-09-03 22:04:51 When reporting problematic samples, It only makes sense if you compare to the lossless original. Converting lossy to lossy, no matter bitrate, is likely to produce artifacts. In your case, mp3 might have thrown out information opus could have used to create a better result.
Re: Bad sound with sample encoded with opus Reply #2 – 2017-09-03 23:03:09 I do not have access to lossless original for this song. But doesn't seem to influence much, as same song encoded with FDK AAC @32kbps sounds superior to opus (on the problematic fragment) which uses much bigger bitrate.