VERY IMPORTANT!
04-30-2009, 04:30 PM
#51
Members
Join Date: Sep 2008
Location: 559, 852, 909
Posts: 101
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 2004 BMW 530i
I burned a CD off of itunes, and most of the songs on the CD were purchased, and like half of the tracks were not able to be read, any idea what the problem is?? The songs are in mp3 and mp4 (or whatever itunes uses) format. There were like 2 that weren't purchased that are mp3.
04-30-2009, 04:36 PM
#52
Contributors
Join Date: Apr 2008
Location: New Jersey
Posts: 2,596
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: '05 545 Titanium Silver, Black Leather - Nav, Logic 7, Cold weather.
Mods:
Carbon filter removed.
M5 iDrive knob.
Umnitza license plate LEDs.
MP3
40% 3M tint
ACS Anti-Roll(sway) bars
RPI Scoop
G-tech Pro RR
CF Roundels
CF Wheel caps
MP3s are compressed audio, they are innately lower quality that a pure CD quality audio file. When you record them to CD you are converting them to a uncompressed audio stream with artifacts from the MP3 encoding still there. If the burning process introduces errors then you are only compounding the problem.
04-30-2009, 04:40 PM
#53
Members
Join Date: Apr 2009
Posts: 46
Likes: 0
Received 0 Likes
on
0 Posts
You misunderstood me.
Audio CDs are uncompressed.
Your audio files on your hard drive most likely are. (mp3 etc.)
When you're burning an audio CD, the burning software has to decode your compressed audio files while it's writing them to disk. If you're burning them at 48x then the software has to decode them at 48x their playback speed, and depending on your CPU speed and decoder efficiency, the software may decide to decode at lower quality to keep up with the burn speed.
My suggestion - decode them into WAV files prior to burning.
Audio CDs are uncompressed.
Your audio files on your hard drive most likely are. (mp3 etc.)
When you're burning an audio CD, the burning software has to decode your compressed audio files while it's writing them to disk. If you're burning them at 48x then the software has to decode them at 48x their playback speed, and depending on your CPU speed and decoder efficiency, the software may decide to decode at lower quality to keep up with the burn speed.
My suggestion - decode them into WAV files prior to burning.
04-30-2009, 04:49 PM
#54
Contributors
Thread Starter
Join Date: Aug 2008
Location: Originally from Koeln, Deutschland. Enjoying it in Bonita Springs, Florida Now :)
Posts: 7,421
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by kapusta' post='864681' date='Apr 30 2009, 08:40 PM
You misunderstood me.
Audio CDs are uncompressed.
Your audio files on your hard drive most likely are. (mp3 etc.)
When you're burning an audio CD, the burning software has to decode your compressed audio files while it's writing them to disk. If you're burning them at 48x then the software has to decode them at 48x their playback speed, and depending on your CPU speed and decoder efficiency, the software may decide to decode at lower quality to keep up with the burn speed.
My suggestion - decode them into WAV files prior to burning.
Audio CDs are uncompressed.
Your audio files on your hard drive most likely are. (mp3 etc.)
When you're burning an audio CD, the burning software has to decode your compressed audio files while it's writing them to disk. If you're burning them at 48x then the software has to decode them at 48x their playback speed, and depending on your CPU speed and decoder efficiency, the software may decide to decode at lower quality to keep up with the burn speed.
My suggestion - decode them into WAV files prior to burning.
04-30-2009, 04:59 PM
#55
Contributors
Join Date: Apr 2008
Location: New Jersey
Posts: 2,596
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: '05 545 Titanium Silver, Black Leather - Nav, Logic 7, Cold weather.
Mods:
Carbon filter removed.
M5 iDrive knob.
Umnitza license plate LEDs.
MP3
40% 3M tint
ACS Anti-Roll(sway) bars
RPI Scoop
G-tech Pro RR
CF Roundels
CF Wheel caps
Originally Posted by kapusta' post='864681' date='Apr 30 2009, 08:40 PM
You misunderstood me.
Audio CDs are uncompressed.
Your audio files on your hard drive most likely are. (mp3 etc.)
When you're burning an audio CD, the burning software has to decode your compressed audio files while it's writing them to disk. If you're burning them at 48x then the software has to decode them at 48x their playback speed, and depending on your CPU speed and decoder efficiency, the software may decide to decode at lower quality to keep up with the burn speed.
My suggestion - decode them into WAV files prior to burning.
Audio CDs are uncompressed.
Your audio files on your hard drive most likely are. (mp3 etc.)
When you're burning an audio CD, the burning software has to decode your compressed audio files while it's writing them to disk. If you're burning them at 48x then the software has to decode them at 48x their playback speed, and depending on your CPU speed and decoder efficiency, the software may decide to decode at lower quality to keep up with the burn speed.
My suggestion - decode them into WAV files prior to burning.
04-30-2009, 05:01 PM
#56
Members
Join Date: Apr 2009
Posts: 46
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Krozi' post='864694' date='Apr 30 2009, 08:49 PM
Oh ok I get it. But if I burn them at 1x, then I don't have to convert them to WAV before to get the highest quality, right?
or get better burning software that would vary the burn speed instead of decoding quality.
04-30-2009, 05:09 PM
#57
Contributors
Thread Starter
Join Date: Aug 2008
Location: Originally from Koeln, Deutschland. Enjoying it in Bonita Springs, Florida Now :)
Posts: 7,421
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by kapusta' post='864712' date='Apr 30 2009, 09:01 PM
Correct
or get better burning software that would vary the burn speed instead of decoding quality.
or get better burning software that would vary the burn speed instead of decoding quality.
04-30-2009, 05:11 PM
#58
Members
Join Date: Apr 2009
Posts: 46
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Brit_in_NJ' post='864707' date='Apr 30 2009, 08:59 PM
The Redbook Audio CD format requires a 720 kbit/s audio stream, you can't really 'decode' at a lower quality because you still need a data stream at this rate, there's no shortcut to decoding, if your computer is slow you might have buffer underrun problems. If your CD burner buffer underrun protection this type of problem should not happen. CD burning software does the conversion to WAV format while it sends data to the buffer.
04-30-2009, 05:12 PM
#59
Contributors
Thread Starter
Join Date: Aug 2008
Location: Originally from Koeln, Deutschland. Enjoying it in Bonita Springs, Florida Now :)
Posts: 7,421
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by kapusta' post='864717' date='Apr 30 2009, 09:11 PM
True, but we're talking about decoding compressed audio. Most codecs allow speed vs. quality tradeoffs in decoding compressed audio and feeding the uncompressed "720 kbit/s stream" to the burn engine.
04-30-2009, 05:12 PM
#60
Members
Join Date: Apr 2009
Posts: 46
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Krozi' post='864714' date='Apr 30 2009, 09:09 PM
So I was right that the sound quality is better at lower burn speed? For me at least?
That was the net effect. The cause was compressed audio decoding speed not burn speed.