View Full Version : Wave PCM 44104Hz stereo to 44100Hz without resampling?
video_magic
11th September 2008, 13:25
I used virtualvcr to capture a laserdisc video and audio. I specified 44100Hz for the wave audio. No matter what settings I chose however, it is always slightly off after I capture!
Is there some way to just modify the wave file so that it reports the rate as 44100? I don't want to do any lossy conversion on the wave if I can avoid resampling it. Please, can anyone explain to me a way to make it be 44100? These backups are very important to me, I have already spent many hours recapturing trying to get the audio rate spot-on, I don't know why it is always slightly off from what I specify.
:thanks:
smok3
11th September 2008, 15:19
i would carefully read
http://virtualvcr.sourceforge.net/html/virtualvcr/sync.php
and after that maybe contact the author (they have forums as it seems) on whats going on.
video_magic
28th September 2008, 02:19
Thanks for your help.
It is the case that I actually had read all of that a couple of years ago, and unfortunately, no matter what settings I tried the sample rate was never exact (44100). For example I have one capture that is 29 minutes and the audio is 44111
Anyway, I have found a solution.
A wonderful free program called wavosaur.
Load my WAVE.
Select it all.
Choose 'Process' - 'resample'.
in the 'change to' box type 44100 and also tick the box which says "change only the sample rate without processing"
:D amazing, wonderful, nice and simple! :thanks:
with the small sample-rate adjustment values I do not observe any 'synch errors' by the way, and I think the quality of the new files is exactly the same?
setarip_old
28th September 2008, 03:14
@video_magic
May I ask why you're concerned about the accuracy of the sampling frequency, if the resultant video and audio are synchronized?
video_magic
28th September 2008, 13:27
I may choose to encode my lossless capture (from laserdisc or video tape) to more than one format - example onto a DVD-R and also to a video file to watch on the computer, and additionally I might author a Blu-ray disc if I get into that.
I had thought the standards for some audio formats to playback supported only some sampling rates such as 44,100 or 48,000 . I am going to try and keep all my archived material (as my sources tapes and laserdiscs might deteriorate) at a fairly comon standard which hardware players should support, this goes for the video resolution as well.
setarip_old
28th September 2008, 15:44
Since you're talking about video combined with audio, that would exclude audio CDs - which are the only format that I know of that REQUIRES 44,100Hz.
In the world of DVDs, etc. the requirement is 48,000Hz.
Therefore, I don't believe it serves any purpose to fiddle around with your 44,xxx sampling frequency - unless and until you have to convert it to 48,000Hz...
video_magic
28th September 2008, 17:00
aaah, 48000..... I knew it was that for DVD :(
Thanks for reminding me setarip_old .
I've been very tired for months, I cannot believe I overlooked something that obvious, been obsessed with trying to get the perfect 44100 for nothing!!
It looks like I now have even more work to do (again), oh well these things happen :)
setarip_old
28th September 2008, 17:12
Thanks for reminding me setarip_old .Always glad to help ;>}
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