Conversione brani con bit rate più alto ad AAC a 128 kbps

Buon giorno! facendo la sincronizzazione del mio iPod touch con iTunes, ho scelto di convertire i brani della mia libreria con bit rate più alto ad AAC a 128 kbps. Risultato: molte musiche risultano disturbate da un rumore-fruscio di sottofondo, che le rende inascoltabili. Oltre a convertire i file sull'iPod, mi ha convertito anche i file nella libreria iTunes. Posso tornare ai file originali e come? Nota: non ho fatto back-up dei brani musicali prima della conversione e quindi di alcune musiche acquistate da su iTunes store non ho l'originale;-( Grazie

Similar Messages

ITunes 7 and Shuffle:"Convert higher bit rate songs to 128kbps AAC" broken

This has become unusably slow in iTunes 7. Is this fixed yet? Does anyone have a workaround?

I have the same issue but with my iPad 2 and iPhone 3GS. Songs play fine in iTunes. If is uncheck Convert higher bit rate songs to 128kbps AAC the no more scratching sounds on my devices.

Irregular Bit Rates for Converted/Imported AAC files (iTunes 7.5)?

I have noticed that my recent additions to my iTunes library have irregular bit rates inconsistent with the usual 128 kbps. They range from 121-131 kbps and appear to be randomly generated. This has happened with MP3s and WMAs that I have converted into AACs and CD tracks that I have imported as AACs. My first additions with these problems were on the 19th of November. Before this time I updated my library to iTunes 7.5. None of my previous 2000+ music files (all AAC) which I have been adding successfully for the last 3 years have had this problem and they are almost all (except for a couple at 64 kbps) at 128 kbps. My suspicion is that the new iTunes 7.5 may be the cause of this irregularity.
Has anyone else had this problem?
Any help with this would be greatly appreciated.

Sorry, I found a past thread related to this issue. No Need to reply

How do I change the bit rate for dls?? How times can I download one song??

I'm new to iTunes. I already downloaded 3 songs when I realized that the default bit rate is 128Kbps. I tried changing the bit rate to 192Kbps with a (Variable Bit Rate) checked.....unfortunately when I downloaded the next 2 songs the bit rate turned out to be the same.
Do I have to restart Windows or iTunes before downloading again?
And now that I have 5 songs with a lower br than I wanted... in order for me to have(download) the song at the higher bit rate...Is it possible to download one song more than once?
Thanx.

You have no choice as to bit rate when purchasing from the iTunes Music Store. The official bit rate of all tracks there is 128 kbps (a very few have been reported to be at higher rates, but that's not a choice you can make, it's how the track was encoded by the record company). The setting in the iTunes Importing preference is for tracks you import from CDs only and has no effect on iTMS purchases.
Is it possible to download one song more than once?
No. Except in extraordinary circumstances, the iTMS allows only one download per purchase.
Forum Tip: Since you're new here, you've probably not discovered the Search feature available on every Discussions page, but next time, it might save you time (and everyone else from having to answer the same question multiple times) if you search a couple of ways for a topic before you post a question.
Regards.

Are .aac bit rates the same as mp3 bit rates?

Are .aac bit rates the same quality as mp3 bit rates? That is:
1. Is an .aac bit rate of 128kps the same quality as an mp3 bit rate of 256kps?
2. Is an .aac bit rate of 192kps the same quality as an mp3 bit rate of 256kps?
3. Is an .aac bit rate of 256kps the same quality as an mp3 bit rate of 256kps?
I use VLC Media Player v. 2.1.5 Rincewind.
1. How do I find out what the bit rate is for an .aac file?

1. Is an .aac bit rate of 128kps the same quality as an mp3 bit rate of 256kps?
2. Is an .aac bit rate of 192kps the same quality as an mp3 bit rate of 256kps?
3. Is an .aac bit rate of 256kps the same quality as an mp3 bit rate of 256kps?
Angel,
Assuming that all of the files you referred to were all transcoded from the same high-quality source, such as a CD, here are the answers:
1. At 128, AAC has an advantage
2. At 192 they are about the same
3. At 256 they are equivalent

Custom bit rate of 192kbps coming out as all sorts

Started importing some more CDs today and the bit rates for the imported files are showing anything between 187 and 195 kbps ?????
The rest of my library shows as 192 kbps all 4000+ tracks.
Anyone explain, as I have not got variable bit rate selected in preferences ( that was my first thought ).
It also happens on converting too.
Message was edited by: Airsculpture

As far as I know, Apple's implementation of AAC never had a true "constant bit rate" (CBR) mode. AAC files encoded by iTunes have always varied slightly, even dropping the bit rate close to 0 kbps on portions of "digital silence." You can verify this by opening an old AAC file in Quicktime and selecting "get info" to view its actual average bit rate. Previously, iTunes simply displayed your target bit rate. I don't think there has been any actual change in how iTunes/Quicktime encode CBR, it is simply that it is being displayed differently.

Bit rates : "good" in mp3 is "high" quality in ACC ?

When I got my Mac in late March, and commenced w/ the importing, I knew nothing of bit rates. Don't know much more now.,.,...but a friend recently pointed out the rate of 128 being lossy.
Checking preferences, we see that in mp3, 128 is indeed the lowest of 3 choices_yet in ACC encoding, it's listed as "high".
I'm sick to the bone at the thought that the nearly 10,0o0 items I've imported into iTunes are now ALL in need of a re-do !!
Is 128 in ACC actually inferior ?
I'd imagine that converting the entire library to mp3's doesn't do more then slightly "expand" tracks that were encoded lossy to begin with !
==oY!==
TIA,
~~~=Dave

Is 128 in ACC actually inferior ?
Not if you play back using a 'standard' audio system. On high end systems you may notice lack of 'depth' compared to playback of an original (store bought) CD. AAC 128 kbps is good quality for general purpose.
Importing your CDs is always a choice between the available space on your HD (and/or iPod) and the audio quality.
The best audio quality is achieved by importing your CDs in AIFF, WAV or Apple Lossless.
The first two are uncompressed formats, having all audio information, but they result in huge files (about 10 MB per minute).
Apple Lossless is a compressed file format, still has all audio information (it's lossless as the name implies), but results in smaller file sizes (about 5 MB per minute).
MP3 and AAC are lossy compressed file formats, resulting in small file sizes (about 1 MB per minute at 128 kbps). Both compressing methods 'throw away' certain, less important parts of the audio.
AAC is considered to have a better algorithm (calculation method).
As a result AAC at 128 kbps is as good as 160 kbps mp3.
If you're happy with the audio quality of AAC 128 kbps (same format as songs sold in the iTunes Store) there's no need to redo them.
Converting these songs to 160 (or 192) kbps mp3 will not improve sound quality, but worsen it.
Omitted parts of the audio cannot be recovered (only calculated).
As AAC and mp3 use different calculation methods, some of the audio information will be omitted again and worsen the quality.
If you are unhappy with the audio quality, import a few tracks in losless formats (AIFF, WAV or Apple Lossless) or AAC and/or mp3 at higher bit rates.
Listen to them on your system and determine which quality sounds good for your ears.
Remember though, importing at high bit rates or uncompressed formats requires lots of disk space.
Hope this helps.
M
17' iMac 800 MHz, 768 MB RAM, 200 GB HD, DL burner Mac OS X (10.4.8) iTunes 7.0.2

Bit rate standards for Compressing video for Captivate

I have been trying to decide whether rto use constant bit rate or a variable bit rate when compressing my video to embed in Captivate.
I have been told by Connect support that a constant bit rate is better for deploying video in Presenter but I am wondering if anyone has information as whether that is also true for Captivate. We are using captive as a means to offer a series of video question and answer sequence for a client of ours, and I am interested in getting the best quality with the smoothest performance in a progressive download flv format
For a simple talking head I am tempted to use a variable bit rate but, I cannot find anything in the seaces I have made that talk about the spec or any pros an cons to that quetsion for Captivate.
Doee anyone have any expereince with that?

I have always used constant bitrate for videos imported into Captivate and that has worked fine. However, I never tried using variable bit rate so I don't know if it will work better or worse.
My guess is that it would be better to go with constant bitrate though because Captivate do have some funny issues with FLV's sometimes and it's probably better not to "stress" captivate ;o)
/Michael
Visit my Captivate blog with tips & tricks, tutorials and Widgets.

Problem with bit rate ?

Hi there,
Using FCP7.
After compressing a FCP project with Compressor and burning DVDSP with DVDSP, I realized that scenes containing objects or people in rapid movement where showing jerked images.
The slow motion scenes are fine.
I checked the following
settings for DVDSP burning: VBR two pass;
averageBit rate 4,0,
max rate 7,0
1) the self-contained QT that I started with is not showing this problem.
2) the m2v file obtained from compressor (I use preset setting for high quality compression) does not show this problem when I view it with MPEG streamclip
3) I tried to burn directly the QT file with Toast 10 …get same problem if not worse !.
settings for Toast
automatic re-encoding
average rate 4,0 Mbps
max bit rate 8,0 Mbps
MPEG-2
I guess my problem comes from the bit rate I used ?
I am now confused and I am not sure I understood the impact of the bit rate setting on the quality of the resulting DVD, and I believe that using a high bit rate in DVDSP might result in problems for some clients to play the DVD on their player ?
Could it be something else ?
could someone please give me advice ?
Many thanks in advance
Ivan

I can only think of two possibilities based on the info available:
1. Old DVD player (choking on the bitrate spike)
2. You need to set some compression markers around the scenes while in FCP. This would flag Compressor to pay extra attention to that area. After you output the new clip, I suggest you use the standard High Quality preset (in Compressor) for your program duration e.g., "Highest Quality 90 minute". Don't get creative with the encoding set-up. And ALWAYS used AC-3 audio.

Controlling output video bit rate in FCPX

I ran into a problem: I created a mp4 file with Share/Export File… (settings: Computer, H.264 Faster Encode, 1920x1080 - edited from an HD camera): its video always freezes at a definite point when played on my BD Player connected to my HDTV through HDMI (audio instead continues on the frozen image).
It seem that the issue is a sudden video bit rate pick of almost 50 Mbps while its average is around 20-30 Mbps. It is not clear to me if this freeze is caused by the BD Player or by the HDTV not being able to handle such pick.
As a test I used Compressor to control the output bit rate (settings: average 20 Mbps and pick 25 Mbps) and this seems to fix the problem. To be more certain I should do more tests, but I'm confident I found a possible solution.
I'd like to know if there is a way in FCPX to control such picks (without using Compressor), either in the Share commands (but it seems to me that they don't provide enough setting controls) or in the timeline. By watching the Video Scopes I can see a quite strong signal in the area where the output file has the bit rate pick. But I don't know any way to have a measure useful to identify them before sharing and avoid a trial and error approach...
Piero
Below the critical point...

Tried to upload a PDF instead of PNG, but no luck. The picture shows a quite standard (I'd say...) image but with highly dense graphic of Y' component in the Y'CbCr Parade (in the limits of 0-100 IRE): much more dense than most images in the rest of the movie. So I assume this might mean a higher bit rate... but it's just an assumption.
Let me summarize my tests:
1st test: FCPX: Share/Export File.. (settings: Computer, H.264 Faster Encode, 1920x1080)
- copied the .mp4 file to USB drive
- USB drive into a BD player connected to HDTV through HDMI >> freezing effect
2nd test: FCPX: Send to Compressor - Compressor: Create Blu-Ray Disk (on Hard Drive) and Video Job with standard Video settings (Automatically select bit rates = ON)
- Played the .img disk with "Mac Blu-Ray Player" on my iMac >> same freezing effect in same position as before on HDTV
3rd test: FCPX: Send to Compressor - Compressor: Create Blu-Ray Disk (on Hard Drive) and Video Job with customized Video settings: Automatically select bit rates = OFF - Average = 20 Mbps - Maximum = 25 Mbps
- Played the .img disk with "Mac Blu-Ray Player" on my iMac >> NO MORE freezing effect (and smaller file by 30%)
I might do more tests (mainly on my HDTV) but I believe the point is the bit rate... and the only way to control it is by using Compressor.
So now my question: is there a color setting that helps in controlling such situation ? e.g. lower saturation, or lower exposure, maybe in mid tones or highlights, or what ?
Thanks so much for your help
Piero

PROBLEM with 24/96 bit-rate USB DAC that worked fine until I plugged in two

I'm using a late 2008 15" Macbook Pro that I bought Jan 2009 right before the SD card models came out. Mac OSX 10.6.4 and iTunes 9.2 are installed. I have a Nuforce Icon HDP and a CEntrance DACport 24/96 bit-rate USB DAC (external sound cards) that still work great right now. Note - 16 bit/44 Khz is CD quality, and these 24/96 files are hi-resolution downloads that are closer to SACD or DVD audio.
I have been evaluating a new third 24/96 USB DAC plugged directly into the Macbook USB port (no hub) which has been working fine for over 2 weeks with 24/96 bit-rate lossless music files in iTunes. Audio Midi Setup is set for 24/96 to match the music file's resolution. After making suggestions to the manufacturer they made some improvements and sent me a new version to listen for the differences.
I listened to the new one for a day and it worked fine, but when I plugged in the original test sample into the second USB port at the same time as the new one in order to compare them, the sound became garbled and noisy. This never happened when either one was plugged in by itself. Note, if I make changes to the DAC's bit-rate in Audio Midi Setup I usually close iTunes first and then re-open it when I am done.
Upon hearing this new problem I unplugged both of the new USB DACs and plugged just one of them back in, but now it causes iTunes music playback to pause when one is plugged in and set for 24/96 in audio midi setup. Prior to plugging in both at the same time, either one worked just fine by itself. There is no reason when unplugging one or the other that they shouldn't start working again. But now I can't play any 24/96 music through either one anymore. In quicktime player the songs don't pause like with iTunes, but there is no sound coming through even with just one DAC plugged in at a time. Then I discovered that if I go into Audio Midi Setup application and lower the bit rate to 24/48 then iTunes will resume playing again and I can hear the music fine with iTunes or Quicktime player.
Basically, my Macbook Pro has now lost the ability to play 24/96 bit rate with either of these new USB DACs, when they both worked fine before I plugged them in at the same time. More confusing is that they use the same USB receiver chip as in one of the DACs that I mentioned above in the first paragraph, and both the HDP and DACport still work fine at 24/96 bit-rate. It's only these two new USB DAC that require me to lower the bit rate in Audio Midi Setup to 24/48 in order to listen through them, and this wasn't a problem as recently as yesterday!
The computer is acting like some setting needs to be wiped out - it's DEFINITELY NOT the USB DAC's that are faulty because they still both work fine at 24/96 on my wife's iMac (I'm afraid to try plugging in both at the same time to the iMac in case I screw that Mac up too).
I have reset the PRAM a few times, and this doesn't fix the problem. I thought maybe the com.apple.audiomidisetup.plist file could be corrupted and deleted it, but that didn't help. I don't know what to try next to get the Macbook to start fresh when trying to use these devices, short of having to re-install OSX.
Please, does anyone have a suggestion of how I can make the Macbook forget it ever saw these two USB DACs, and let me start fresh so they start working normally again? I do dozens of reviews for Head-fi.org and I can't afford to have my Macbook Pro compromised like this, which could prevent me from doing some reviews or evaluating new products.

UPDATE:
As noted in the first post, both of these newer USB DAC work fine at 24/96 on my wife's iMac, so it's clear that they didn't both become defective when I connected them to the Macbook Pro at the same time.
Resetting the Macbook Pro PRAM didn't help, so I removed the hard shell laptop case to get to the battery and remove it, then reset the SMC. After that I could use the original DAC at 24/96 again, but only IF it was plugged into the rear USB port. If I plugged it into the front USB port then the sound was garbled and filled with noise. This was a vast improvement over no sound at all.
Then I switched to the replacement/updated DAC, but I got no sound at all from either USB port at any bit-rate. And returning to the original DAC again now results in no sound again.
Sigh... I will reset the PRAM and SMC again, and see how far I can get with this. I'd still love some help. Thanks!

HT4914 I have an iTunes library of some 18k tracks. If I subscribe to iTunes Match, can I delete my library from the pc hard drive and then download my entire collection back at the higher bit rate of 256?

I would like to improve the quality of my iTunes library, most of which were ripped at the old 'higher quality' setting and not lossless.
I would consider subscribing to the iTunes Match programme if I would later be able to download my music back on to my PC at the improved higher bit rate stated.
Is there a problem with this?

In iPhoto, Select All the Photos you want to move... Then goto > File > Export >
Choose the settings as seen here
Click Export and select your External Drive
Best to create a Folder to put them in... and away you go...

HT204406 how do I download higher bit rate songs from itunes match to replace the lower bit rate I have on my itunes library?

I have itunes match and I have about 500 songs that were ripped at 128kbps. I have been tolf that I can replace them via itunes match to improve them to 256 or 320?
I have put them into a playlist in my itunes library and I want to know how I can upgrade their bit rate via itunes match. Can anyone help me?

Sid,
With the device connected, click the Summary tab and you will see the "Convert higher bit rate..." option. Set it to 128. See picture below:

How Can I Make Encore Create a Bluray Image that uses a Bit Rate that Really Fills The Disc?

I have searched and browsed but have not seen this specific issue.
I realize that if you leave the bit rate alone, Encore will use the best bitrate. In my experience, it doesnt. I have also found that the Disc Info on the Build tab is never correct. The final transcoded size of the ISO is always very different from what is shown.
With the current disc I am making, I am encoding 4 HD m2t video files that total 20 GB on disk. The total running time is about 1hr 50m. Leaving everything set to defaults, the final size of the ISO file is 12 GB. I would like the final size to be around 20GB. I would expect that Encore would do this automatically. Changing bitrate in the project settings and re-transcoding does not change the final size. If I manually set the encoding, the size does change but since the Disc Info is unusable, it is excruciating trial and error. You have to pick settings that you think will work, wait hours for it to transcode, then it is way to big or way to small. I cant figure out how to get it to my target size.
Also, when I transcode the files, Encore never lists the bit rates of the transcoded files. The field is always blank.
It may also be note worthy that I have to first transcode the files, then build the disc. If I dont do that, the transcoding will hang. Even when I do separate the steps, sometimes when I build the disc from the transcoded files, the build of the disc still hangs.
I am running a 3 GHz Quad CPU with 4 GB of Ram in 32 bit XP Pro. I have 5 physical drives of 500 GB each. I also use separate physical drives for the source files vs the target ISO. Disk space is not an issue.
Also, is there any timeframe for when Adobe is going to release a new update? I have also run into other problems on this forum like the wonderful error 6 and the hanging transcoding, although my solutions to both problems were different than what was posted. It is all hit or miss.
Does anyone know if Adobe going to add a feature like on other disc authoring programs where you click a Fit to disc button and it then calculates the best bit rate for the specified disc size? That would make me very happy.
I would appreciate any help here.

Encore does have a fit-to-disc feature, called "automatic transcoding", which chooses the bit rate based upon how much media there is to encode, how much room is currently on the disc, and applying format-legal restrictions (minimum and maximum bit rates allowable by the format).
So for instance, 30 minutes of video will never fill a disc because the required bit rate to do so would be higher than allowable by the format.

Can no longer change bit rate in AAC custom import settings

I've been re-ripping all my CDs at the new higher bit rate. My import settings were AAC Encoder -- custom, originally set to 256 kbps, VBR, and auto for the other two settings. However, some CDs I wanted at a lower setting, so I would go change the bit rate to either 192 or 224 (just so I'd have more room on my ipod) and there wouldn't be a problem. But now it's stuck -- the pop-up box no longer opens when I choose import settings, AAC Encoder, Custom, so I can't change the bit rate or anything else, and it's stuck on 224 kbps. I can still change bit rate and other settings in the custom menus for MP3, WAV, etc., just not AAC. A repair install of iTunes did not fix the problem.

Hi, Ed. I am running iTunes 9.0.3.15. When I click custom, the settings description in the details box display what they were before this thing happened = 112 kbps (mono)/224 kbps (stereo), VBR, optimized for MMX/SSE2. The pop-up dialogue box that used to appear (where you could choose the specific bit rate from the drop down menu) does not appear at all.
However, when I choose anything other than AAC Encoder, and then pick custom, the pop-up box appears and I can choose the bit rate and adjust the other settings as usual. It's just not happening for AAC Encoder anymore. Since the total un-install (following Apple's specified order) and reinstall didn't work, I'm baffled how to fix this .... (If it makes a difference, I changed the bit rate in the custom box while a CD was being burned...Apparently that was stupid, but I had done it previously without incident.) Thanks.

Conversione brani con bit rate più alto ad AAC a 128 kbps

Similar Messages

Maybe you are looking for