Problem converting .mp2 to .mp3

[Mancusco]

I copied a radio program last night using Nebula Electronics DigiTV. The original is in .mp2. I then tried to convert it to .mp3 with the result being that it plays through both Windows Media Player and Creative Media Source but at 3 or 4 times the speed. Note the resultant decreased length of the track in the Audio Properties for the 2 types below.

I get the exact same result converting to .wav and .wma

During the conversion process I don't get any error messages, it all appears to be working fine and going to the correct folder etc.

Any help much appreciated.
Thanks
Sam

Sorry for all the data that follows but though it best to include it.

Audio properties of original copied radio program in .mp2

Size: 81.58 MB (12% of original, 7 to 1 compression)
Original Size: 652.67 MB
Length: 59 minutes 24 seconds
Channels: 2 (stereo)
Sample Rate: 48 KHz;
Sample Size: 16 bit
Bit Rate: 192 kbps
Encoder: QDesign (Guess)
Encoder Settings: Constant Bit Rate 192 kbps
Audio Quality: Medium (Lossy)
Channel Mapping: Left, Right
File: Joni Mitchell 1
Type: Movie Clip [.mp2]

Audio properties after converting to .mp3

Size: 26.97 MB (12% of original, 7 to 1 compression)
Original Size: 215.72 MB
Length: 19 minutes 38 seconds
Channels: 2 (stereo)
Sample Rate: 48 KHz;
Sample Size: 16 bit
Bit Rate: 192 kbps
Encoder: LAME 3.97
Encoder Settings: Constant Bit Rate 192 kbps
Audio Quality: High (Lossy)
Channel Mapping: Left, Right
File: Joni Mitchell 1
Type: MP3 Format Sound [.mp3]

[Spoon]

Re: Problem converting .mp2 to .mp3

Is the frequency of the source file really 48Khz?

[Mancusco]

Re: Problem converting .mp2 to .mp3

Spoon - Thanks for the reply.
Not sure about the frequency, I would have to check when I go home this evening. Could/should it be different than what is listed in the properties?
Sam

[Mancusco]

Re: Problem converting .mp2 to .mp3

I just played the source .mp2 file through dBpowerAMP and it says
48 KHz 192 Kbps - if that helps.

[LtData]

Re: Problem converting .mp2 to .mp3

Does the file sound fine when your playing it?

[Mancusco]

Re: Problem converting .mp2 to .mp3

When played in .mp2 format - yes it sounds fine. Only in .mp3 and other converted formats does it speed up.
Sam

[Spoon]

Re: Problem converting .mp2 to .mp3

Try converting it to wave.

Are you using R12?

[Mancusco]

Re: Problem converting .mp2 to .mp3

I had tried converting to wave with the same 'speeded up' result. Same with .wma. Yes I am using R12. :sad:



Sam

[Spoon]

Re: Problem converting .mp2 to .mp3

If you could email one file please:

http://www.dbpoweramp.com/email.htm

[Mancusco]

Re: Problem converting .mp2 to .mp3

Thanks Spoon - Email should be with you.
Sam

[Spoon]

Re: Problem converting .mp2 to .mp3

Thanks go it, will look as soon as my schedule allows.

[omrud]

Re: Problem converting .mp2 to .mp3

Sorry for butting in to this old thread, but I have exactly the same problem: mp2 audio recordings made by DigiTV over a Nebula DTV card, the mp2 files play perfectly on my PC (Windows Media, Nero Player), but when converted to any other format (WMA, WAV, MP3) the result is somewhere around double speed.

Was there a solution?

Thanks

David

[Spoon]

Re: Problem converting .mp2 to .mp3

No solution, our decoder is skipping frames, then not resyncing, there did not seem to be an easy fix.

[omrud]

Re: Problem converting .mp2 to .mp3

No solution, our decoder is skipping frames, then not resyncing, there did not seem to be an easy fix.

Thanks - that's a pity. I tried Audacity and it does convert the file correctly, although it's very slow. Is there any prospect of analysing what's wrong? The Amp player plays the mp2 files OK.

FWIW I never had any problems with mp2 files generated from my TiVo.

David

[Spoon]

Re: Problem converting .mp2 to .mp3

Which Amp version do you have? old versions used XAudio to decode mp3.