Intensity Stereo for low bitrates
Georg Holzmann <[email protected]>
| Newsgroups | gmane.comp.audio.mp3.lame |
|---|---|
| Message-ID | <[email protected]> |
Dear list! I would be interested to try intensity stereo in LAME when using low bitrates. This should be an advantage for e.g. podcasts, which can be hours long and where it is sufficient to use lower bitrates (96k - 64k). (more about my motivation in [1]) I did find the following (closed) ticket about intensity stereo: http://sourceforge.net/p/lame/feature-requests/45/ And the the branch "takehiro-2002_05_07-experimental" in CVS, with some commit messages which include changes for IS (see [2]). I tried to backport the relevant changes from "takehiro-2002_05_07-experimental" into the main branch, but so far I did not succeed because the code bases diverged already a lot. So my questions: - Is there any (active) plan to support intensity stereo? - Is it likely that takehiro-2002_05_07-experimental will ever get into the main branch? If someone has any hints or suggestions, how it would be easier to merge these changes back, it would be highly appreciated! Thanks for any feedback, LG Georg [1]: Why MP3 Intensity Stereo? Podcasts/radio are most of the time speech-only and can be very long, therefore it is obviously important to create as small files as possible. Common bitrates are 64k mono, 96k stereo (or lower). More recent formats like OPUS or AAC are of course much better, but MP3 is the de-facto standard in podcasting distribution, mainly because of the wide software and hardware support. Another point is, that AFAIK in 2017 the remaining patent licenses should expire and then it will be an even nicer distribution format. I have no doubt that it will stay for a very long time. [2]: Commit message which include intensity stereo in branch "takehiro-2002_05_07-experimental": - prepare for intensity-stereo <2002-11-10 Son> - initial support of intensity stereo for lower bitrate it will be enabled when 64-112kbps by default <2003-05-18 Son> - fix low bitrate and intensity stereo <2003-10-30 Don> - better intensity stereo band selection <2003-12-29 Mon> ------------------------------------------------------------------------------ _______________________________________________ Lame-dev mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/lame-dev