Pcm Crackle, No Pop Or Snap, Audio distortion in PCM format

[Kneller]

When capturing Audio at PCM standard the audio recorded, not previewed, had allot of distortion. By this I mean crackle which is as if the record volume is set too high. (Similar to when you set the record volume too high on a and old cassette deck). I have changed the volume slider in Windows and on the volume meter in Virtualdub. Nothing seems to make a difference. The only thing that removes the crackle is recording in MP3 format.

[Kneller]

Please help its getting me down not being able to fix this.

[Kneller]

O'h come on some one must know this. It is realy getting me down now

[SaSi]

Can you check the sampling rate at which you capture sound? I suspect that you are capturing mp3 at a different sample rate (perhaps because your MP3 codecs only support these). For example, perhaps you are capturing PCM at 48kHz and MP3 at 44.1kHz.

Try recording audio (from a cassete player or external DVD player) at variable sampling rates. It may be that the audio card has problems.

BTW, are you using a sound card? Or are you using the onboard AC97 codec chip?

[Kneller]

I think you have sent me in the right direction. I'm not to sure with sampling rates etc. BUT. If I chose Sony Hi 8 from the drop D List all works well. (This is OK as the source is mono). So I am going to try different presets and change the format and rates from their drop D Lists.

I have the sound going directly from the VCR to Sound card. So as a newbie I geuss I'm using the Card not AC97, which I think is on the video card right?

BTW, any idea why I have to keep going into ULEAD to change the format of the signal from NTSC to PAL. Why would it keep defaulting to NTSC? How can I change from VirtualDub. (I want to keep away from ULEAD, it has wasted so much of my time)

Ta for your help.

[BJ_M]

Don't double post -- your thread is continued here :::

https://www.videohelp.com/forum/viewtopic.php?t=153514