For starters, thanks for what appears to be a great app. Just downloaded yesterday and, so far, its great. I am capturing Youtube videos as .flv files and then converting to .mp4
The files are music instruction related and, unfortunately, are not always in the right key and/or are too fast for me to keep up with. I'm using AudioCodex to correct the pitch and timing which works fantastically and way beyond my expectations while I run it 'live' on my Mac.
What I really want to do is save the whole .mp4 or at a minimum the audio portion with the corrected pitch and pace so that I can watch/listen on my ipod. I can't seem to do this. I can get an audio only but it's extremely distorted. So much so that I can't tell if the pitch and pace are correct.
Any ideas or suggestions?
Thanks.
-Phil
Hi,
For video files AudioCodex can only extract the audio component to a standalone audio file, AC doesn't create / encode Quicktime movies at this time. I have used AC to extract audio from YouTube FLV's in the past (courtesy of Perian), as well as from MP4's that started out as YouTube FLV's but were converted to mp4 by various other apps.
At the moment, Time & Pitch aren't automatically processed in the Export pass when extracting audio from Quicktime files, although this will be added within the next two updates ( the first of which is due out within the next couple of days). The extracted audio files will be in uncompressed AIFF 16-bit format, and should be added automatically to the end of the first playlist after exporting is complete. Time & Pitch shifts need to be reapplied to the new AIFF track manually, however as the new AIFF is decodable by CoreAudio, re-exporting will allow you to lock the Warp settings into the newly exported file.
I myself haven't experienced distorted audio as a result of Quicktime audio extraction, but one thing to check is the 'Quality' setting on the 'Warp' section of the 'Adjust' tab of the Inspector; unless you are on a G3, this should be set to Medium or High. On a G3, low quality is about the maximum you can get away with before using 100% cpu, while on Intels, low quality can sound really bad. Also check that the FxChain hasn't got any undesired effects still loaded from a previously played CoreAudio track.
In general for tracking down solutions to these sorts of issues it is also useful to know your OSX version & localisation, Quicktime version, type of Mac, and also details of any third-party firewire or usb audio hardware you might be using.
Let me know if any of this helps or not, even if it doesn't be sure to check out the 1.1 update which should be released sometime in the next few days; a lot of work has been done on the audio exporter for this coming release.
Cheers,
Mark Hill
MachineCodex Software
Another thing that would be good to know is the app used to create the mp4 versions of the FLV's... the issue might be due to something in the way the mp4 conversion is being handled.
You could also try extracting audio from the FLV directly in AudioCodex; note that for this to work you need the latest version of the free
Perian codec installed.
With Perian installed AudioCodex can play locally-stored FLV files directly, and should also be able to extract audio from 'most' of them, although I have found that not all FLV's have extractable audio; the last batch of YouTube video's I tested audio extraction with worked OK, but FLV's from some other sites could only be played; audio extraction from these failed, for reasons I have yet to fully determine.
Anyway, let me know how you go
Cheers,
Mark
Sorry about neglecting to specify my setup. I have a:
Macbook 2Ghz
OSX 10.5.2
1GB RAM
QT 7.4.5
American/English locale
no extraneous h/w audio or otherwise
My process is to capture an flv file with downloader9.com, then convert it
to mp4 with iSquint. Params for iSquint are max quality and optimize for iPod.
This time I moved the volume on AC down to the midpoint, took 200 cents off
the pitch and 10 beats off the pace. And then exported at max quality. This resulted in an aif file 9-10X the size of the original mp4, undistorted, but with no change in pitch or pace.
Then I ran that file thru AC with the same pitch and pace changes and ended up with a nondistorted file with the appropriate pitch and pace changes that was only 2-3X the original mp4 size.
Very respectable. Look forward to being able to do it in one pass tho. Thanks for the quick response and suggestions. I'm thinking I may not have turned down the volume on AC the first time.
-Phil