Open vladkorotnev opened 11 years ago
Interesting. I think I hear it, but is there a specific timecode in one of those songs that you year it the most at?
Not quite timecodes but still. Track 1: 00:32~00:35 [slight chirp] ~0:37 [even slighter]
It's 1 AM here so can't turn music on for a long time but I have added track 3 which is a copy of this video: http://www.youtube.com/watch?v=ZK0TvORCnA0 in m4a format. Compare them, and at about 0:54 just before the main riff comes in you hear these chirps too.
OK I'll take a look. Thanks for reporting, and by the way, awesome app!
Hehe, thanks, made a small video about it recently. http://www.youtube.com/watch?v=8XF-FwMMBEM It would be nothing without your code though! Thanks a lot
You should add a link to it to https://github.com/audiocogs/aurora.js/wiki/Known-Uses :)
After fef4ab2cab9089339a1dcfef179bcccfe22286b0 it sounds a little better, less pops I think, but I still hear some really high pitched overtones sometimes. Still looking.
Uh, now i need to figure out how to compile it and test it ^^''''
We've been experiencing the same issues on our platform too. I've tried forcing a resampling etc. nothing works.
We use VBR encoding via faac, and if the quality level is anything less than 100, the noise gets worse, at around 70-80 it starts getting impossible to listen to the audio.
Whoever fixes this is god lol
I also hear high-pitched static, in my case with ADTS-encoded AAC. I can provide sample files if needed.
ADTS encoded AAC at our end too. Is this an ADTS specific issue?
Sample files would be very useful, thanks.
Here's an example: http://1drv.ms/1OrjGDf
The reason it sounds weird in this case is that the file is encoded as an HE-v2 AAC file, which is not currently supported by AAC.js. The SBR (spectral band replication) data is being ignored currently, which accounts for the high pitched overtones you hear. See #1 for the open issue about HE-AAC support, and read more about it on Wikipedia.
Is there are similar problem with VBR as well?
On Sun, Apr 19, 2015 at 7:42 AM, Devon Govett notifications@github.com wrote:
The reason it sounds weird in this case is that the file is encoded as an HE-v2 AAC file, which is not currently supported by AAC.js. The SBR (spectral band replication http://en.wikipedia.org/wiki/Spectral_band_replication) data is being ignored currently, which accounts for the high pitched overtones you hear. See #1 https://github.com/audiocogs/aac.js/issues/1 for the open issue about HE-AAC support, and read more about it on Wikipedia http://en.wikipedia.org/wiki/High-Efficiency_Advanced_Audio_Coding.
— Reply to this email directly or view it on GitHub https://github.com/audiocogs/aac.js/issues/4#issuecomment-94223201.
@bitonator do you have a sample file?
FYI work on SBR happening here: https://github.com/audiocogs/aac.js/pull/13
The m4a decoder makes a lot of high-frequency crackle and bleeping on some files.
Test case: http://vladkorotnev.me/webtunes/player.php?list=74&track=1 Listen to tracks 1 and 2. Expected behavior: acceptable quality playback. Resulting behavior: music along with bleeps and cracks around 10kHz and almost missing high frequencies. The same files sound awesome in QuickTime 7.
The tracks can be downloaded (play a track and then click the right "down arrow" key in the player control display) and played in QuickTime to prove that it's not the files being low-quality.
Great JS plugin otherwise though, enjoyed building with it, thanks Audiocogs!