DV-AVI audio is only 32Khz, 16 bit Stereo, Is that right???

[rapjp2001]

Guys,

Quick question...

I am about to process some miniDV to MPEG2 video and WAV audio and author a DVD...

In extracting audio from the DV-AVI that i captured from my camcorder using firewire, I noticed that most programs are reporting that the audio is 32Khz, 16 bit Stereo -- Is that right???

I thought miniDV footage was 48 Khz, 16 bit Stereo and all I would have to do is extract the audio direct and add that as the audio track in the DVD authoring application...Now I see that if the sampling rate is 32 Khz, then I need to "up-convert" the audio to 48 Khz...I was so sure that the audio is 48 Khz...

Is this issue of sampling rate a function of the source DV camera at the time of recording or something I did when firewiring it to my desktop -- This footage was not shot by me, but sent from a friend at a concert he shot some footage...

Very very puzzled...

Please clarify!

Thanks

[bb]

Although 48 kHz is used often, 32 kHz is also common. E.g. my Canon MV-3 supports 32 kHz only, regardless of the sample precision (12 or 16 Bit). For SVCD or DVD you have to upsample.

bb

[rapjp2001]

Aha! I see the picture now!

Thanks for the feedback...

You see, this video was shot by a friend of mine with his camcorder and I do not know the make...meanwhile, I have a Sony TRV25(I think, can't remember) and it records audio in 48Khz and hence I almost assumed that was the lowest common denominator...

Rajiv

[Zeppeliner]

The DV cameras I've had first hand experience with have all had the option to choose between 4-channel 32khz 12 bit (it records on 2, then you can dub edit on the other 2) or 48khz 16 bit. Needless to say I always record with the latter as I have no use for the dubbing feature and find 32khz/12bit absolutely horribly-sounding.

[bb]

Yes, 32 kHz @ 12 Bits is low quality. But I guess the sampling precision is more important in terms of quality than the sampling rate. My camcorder's max. settings are 32 kHz @ 16 Bits, and the sound is ok. I guess with the crappy built-in microphone you wouldn't hear the difference to 48 kHz either. For high-quality audio you need an external (stereo) microphone.

bb

[Jazz]

That fits with my observations. My Sony has options for both 32 and 48, but using the internal microphone it hardly makes a difference.

[Zeppeliner]

bb you may very well be right about the sampling precision, I don't think I've heard any cameramic-recorded material at 32khz/16bit so it may very well be fine -- however, even with only a camera mic, there's a vast difference between 32khz/12bit and 48khz/16bit. Without trying to be nasty here but if you can't hear a big difference between those two then I have to say that your hearing isn't too good ;)

[bb]

I said you wouldn't hear much of a difference between 32 kHz @ 16 Bits vs. 48 kHz @ 16 Bits. But you will hear the difference between 12 Bits and 16 Bits. A sampling rate of 32 kHz is good for frequencies up to 16 kHz - which I doubt that built-in microphones can record.

bb

[Tihomir]

I'm owner of Sony DCR-TRV110E (the oldiest D8 model). Sound settings is also very important in pasthru capture methode and differences are significant in comparison of 32 kHz/12 bit and 48kHz/16 bit, especially with good analogue sorce.
Regards
Tihomir