I am trying to avoid having flash recompress my MP3 audio
when publishing. In the help menu, it says I should open the
properties dialogue for the MP3 file in my library. Then I should
select "MP3" from the dropdown menu. Then I should select "Use
imported MP3 quality." However, when I select "MP3" from the
dropdown menu, there is no use imported MP3 quality option. It only
gives me compression options.
I have searched these forums and it looks like there are
others having this problem, but no answer has been given. When I
choose "view comments on livedocs" from the help menu, there is a
comment that someone else is having this problem, but no solution
offered from Adobe or anyone. If anyone has experience with this,
or if there are any adobe support personnel that read these forums,
I would really really appreciate a solution to this. Is there
something my audio technician needs to know when he is creating MP3
files? Is there something else within flash that I need to address?
DJ Gecko, Oct 3, 2009 9:14 AM
> I am trying to avoid having flash recompress my MP3
audio when publishing. In
> the help menu, it says I should open the properties
dialogue for the MP3 file
> in my library. Then I should select "MP3" from the
dropdown menu. Then I
> should select "Use imported MP3 quality." However, when
I select "MP3" from
> the dropdown menu, there is no use imported MP3 quality
option. It only gives
> me compression options.
Use WAV format instead. You can give it MP3 compression upon
If you want to mail me - DO NOT LAUGH AT MY ADDRESS
You can disable the compression of your published sound from
the Audio setting in the Publish Setting menu as following:
1- From the publish setting, open Audio Streaming or Audio
Event setting dailog box
2- Choose Disable compression from the Compression drop-down
I'm sorry, but neither of the provided solutions really work.
I'm having the same problem as ChrisRTA -- the "Use Imported MP3
Quality' check box does not show up. I need this because my client
demands that his MP3 sounds are not changed or re-compressed in any
'Disabling' compression for 'stream'] in publish settings
still results in a lower [unacceptable] sound quality. I'm not sure
why, but even playing with the different options in the Sound
Properties window [like 'default', MP3, etc] it seems 'disabling'
doesn't do anything. If I 'Disable' both Stream & Event, then
the .swf publishes with no audio whatsover.
I've researched this issue on the web, and other people have
had this problem. No solutions offered except someone suggested it
might have something to do with how the MP3's have been created.
It would be nice if Adobe gave us some help on this. I've
lost many hours trying to resolve.
When I import MP3 sounds that were originally 48 kbps and
128kbps bitrate, the "Use Imported MP3 Quality" check box DOES
When I import MP3 sounds that were originally 56, 160, 192
and 320 kbps bitrate, the "Use Imported MP3 Quality" did not
I failed high school algebra, so I am unable to come up with
an equation to solve this. But it seems that there must be some
number which the bitrate must be a multiple of, in order for Flash
to enable imported MP3 quality export.
Here's what I've found that is not necessarily obvious to
someone who is not an audio engineer: An MP3 file can be compressed
to whatever bitrate you want, but it still has a sample rate that
is completely independent of the bitrate. As such, flash's
"feature" that automatically resamples audio files to multiples of
11Khz extends to MP3 as well. If your MP3 file was not compressed
at some multiple of 11Khz sample rate, the "use imported MP3
quality" box will not be available.
HOWEVER, while this helps some, it did not solve my overall
problem, which is that I wanted flash to not touch my audio at all.
It seems it is not possible to avoid having flash compress your
audio at some point of the process. If someone from Adobe could
verify that there is or is not a way to leave our audio untouched,
that would be very helpful. (and if it's not possible, please
include it in the next version!)
My eventual solution was just to go back to using wav files
and have flash compress the MP3 audio. The quality is slightly
worse than what my sound engineer had been able to provide, but it
was a better result than what flash gave me when I used "use
imported MP3 quality" on a properly created MP3 file. For whatever
reason, flash recompressing the already processed file created ugly
audio artifacts and generally negated the benefit of using a better
quality file to begin with.
I too have very good quality mp3 sound and have been
frustrated because Flash won't use the imported mp3 quality - same
problem as Chris. All my sound is 44 kHz 16 bit mono, all recorded
at the same time and edited by me in the same way.
So the divisible by 11kHz that Chris suggests doesn't work
for me. However, I do have one sound event that sounds excellent in
my movie - it's even more noticeable because it's in the middle of
muddy, tinny, degraded sound events (as I said, all recorded and
processed the same). Here's the difference. For the degraded sound
files, Flash thinks they are large files when they are not; for
example, Flash says the size of sound event 1 is 230.7 kb, where
the actual file size on disc is 24 kb. This huge file size
discrepency is true of the other 10 degraded sound events I looked
at. In all these cases, Flash doesn't ever display the "use
imported mp3 quality" option.
In the one case of excellent sound, Flash automatically
displays the "use imported mp3 quality" and it says that the sound
size is 17.3 kb. The file on disk is 20 kb.
It looks as though Flash doesn't recognize all the other
sound files as mp3 (although on disk they are all mp3) and is
decompressing them only to compress them again and do a terrible
job. So what is the solution to this problem (I need excellent
sound for my application and I paid recording fees so that it would
be good) and why doesn't Adobe say something about this?
I'm replying to my previous reply and the problem is solved.
It turned out that my audio was recorded at 48000 Hz sample rate.
The one mp3 sound clip that Flash handled properly was recorded at
44100 Hz. (I thought all my sound clips were 44kHz from looking at
the Flash properties - this is not the place to look. Audacity gave
me the true rate.) So ChrisRTA had it right.
When I convert my mp3 clips to 44100 Hz, Flash treats them as
mp3 and they sound excellent in the swf file. I don't think Flash
is recompressing them at any point.
It is strange, but I am trying to think with you. I know that
the best extension to use to get a good audio quality is to import
the audio as .wav not .mp3, because Flash converts all the sounds
to mp3. May be this is why the quality you get from the .wav files
is better than the one you get form the mp3 files, even when the
compression is disabled, Flash still convert the sound whatever its
extension to mp3. So, it is like you convert an mp3 file intro an
mp3 using a sound convert, mp3 is a compress
Okay, I've run into the same problem, and I think I've got
this figured out. ChrisRTA was close, but the magic denominator is
not 11 kHz, but exactly 11025 Hz (11.025 kHz). So, the MP3 must
have a sample rate of 11025, 22050, or 44100 Hz. (33075 Hz would
theoretically fit in this rule, but my MP3 encoder doesn't seem to
support that frequency so I can't test it.)
It seems possible to work around this by using a loader to
load the MP3 externally, but it plays back too quickly
This stipulation would not be so annoying if it were better
Okay, looks like I spoke too soon… Flash is now trying
to re-encode some of my 44.1kHz MP3s as well. At first, I thought
it was a stereo/mono thing, but further testing dispels that. So it
looks like there's some factor in addition to the
In addition, when I try to add *some* MP3s to the stage by
drag-and-dropping, it fails silently and nothing ever shows up in
Adobe, it looks like this aspect of the IDE could really use
some work! At least tell us what the limitations are so we don't
have to guess!