(In reply to comment #36) > if everyone is also satisfied, I'd like to go ahead and commit it and move > on to the detection simplification. If you're OK I'd still like to try with SVN FFmpeg, since that gave endless trouble before. I assume you have done this, but since I'm inexperienced there is a chance I could find a problem by doing some something silly.
I don't see we can do a "Stereo Tracks to Mono" on an M4A imported via libfaad as it would take too long. But could or should you do some hackage in our FFmpeg code so that it imports "first time" as mono? I think the answer to that is "is this a libfaad bug"? It appears that upMatrix for "implicit signalling of PS" is deliberate, unless the commenting is the bug. Certainly users would prefer if mono AACs came in as mono irrespective of decoder and if so we don't have to release note. Apple accepts mono AAC as part of its standard doesn't it? > I'd like to leave it with FFmpeg first and then QuickTime. That way Audacity. > will behave the same on Windows, Linux, and OSX... this would mean a change > in behavior and the possibility that FFmpeg would take responsibility for > importing a file when the QuickTime importer may be a better selection. > However, with the extended import/export option in preferences, the user > would be able to override the order if desired, so there's no loss of > functionality. To answer that, can you explain more about in what circumstances FFmpeg is tried first and what extensions are involved - is it aac, m4*, mov? And I think OpenFile has a "QuickTime files" or similar filter, correct? The way I see it "should" work is that the current setting of the filter in OpenFile determines what importer is tried first, if there are no "extended import" rules set, or if there are rules but we don't force them to override the filter. However how it works now if you have no rules set is that the "overrides" checkbox in Extended Import Prefs affects matters. The checkbox is unchecked by default (OpenFile doesn't override), so when you go to File > Open, choose the FFmpeg filter and import a WAV, you actually still use libsndfile to import; to force that filter to use FFmpeg, you have to go into Prefs and check the box although its wording "any rules" implies it should be irrelevant if there aren't any rules. So question: should that box be greyed when there are no rules? And if not, shouldn't the box be checked by default? Otherwise, we're contradicting the Manual that says the OpenFile filter forces use of FFmpeg: http://manual.audacityteam.org/index.php?title=File_Menu#Open... Basically the Manual was correct until LRN changed things so that any import method respected the filter choice or the rules set. Now let's look at the scenario where we import a WAV with a rule set to use libav for WAV. If the check box is checked (OpenFile overrides) and you choose the WAV filter in OpenFile, the WAV imports via libsndfile. OK. Now uncheck the box (OpenFile doesn't override) and choose the WAV filter in import files - the WAV imports via libav. OK. And when you then use Recent Files or drag you also get libav used. I think it's 100% correct the same importer is used irrespective of open method, but some people read that checkbox as worded to mean that "no-override" doesn't apply if you don't use the OpenFile dialog. So second question: can we reverse the logic of the checkbox so it becomes "Force importer order irrespective of filter in OpenFile dialog"? Or short form "Rules override filter chosen in OpenFile dialog"? I think that would remove the confusions people are having here. ---- On the CLI/GUI speed craziness, clearly these two are the problems: * Windows (external program) export is unreasonably slow, any encoder. Start a new bug? * Ubuntu "M4A files" export is unreasonably slow - but not (external program). This is the major reason for the "slowness" part of bug 317. Can it be addressed? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/602934 Title: ffmpeg import/export not working with ffmpeg version in maverick -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
