How to find out audio sampling rate in VirtualDub ?

Archived from groups: alt.video.divx,rec.video.desktop,comp.os.ms-windows.video (More info?)

I wanted to append a video movie to an already loaded video movie in VirtualDub.
When I try this operation a dialog pops up informing me that

"Cannot append "D:\aaa.avi": The audio streams have different sampling rates (16000.00000 vs. 15963.00000)

When I load the second movie into VirtualDub and go to File->FileInformation
The audfio stream data is as follows:

Sampling rate 44100Hz
Channels 2
....
MPEG Layer-3
.....
Data rate: 128kbps

Where is the sampling rate from the popup displayed? I cannot see the number "15963".

How do I have to recompress the second movie that the new, resulting movie matches exactly
the requirements of the first movie for the append operation?

Mike

Archived from groups: rec.video.desktop (More info?)

In the faraway land of rec.video.desktop, Simon Walters <trysiwalters@th
eoppositeofcoolmail.com> said:
>
>"Mike Kleiber" <mkleib@email.com> wrote in message
>news:cg83se$lv8$05$1@news.t-online.com...
>> I wanted to append a video movie to an already loaded video movie in
>VirtualDub.
>> When I try this operation a dialog pops up informing me that
>>
>> "Cannot append "D:\aaa.avi": The audio streams have different sampling
>rates (16000.00000 vs. 15963.00000)

This isn't the frequency sampling but the bitrate: 16000 bytes/sec means
it's an 128Kb/sec mp3. The reason for the difference is probably that
the first one is declaring its nominal bitrate (the Fraunhoffer mp3
codec does this) whilst the other is declaring its real bitrate (a file
that's been edited by VirtualDub will have had its bitrate amended in
this way to solve the audio sync problem that you otherwise get - see
VirtualDub help files for more info).

You may be able to fix the problem by opening the first file in
VirtualDub, setting Direct Stream Copy for video and then saving it.
With any luck VirtualDub will set the audio bitrate of the new file to
15963 during saving, enabling you to join the two files.

>
>When I started out years ago, i soon found that VirtualDub (V1.2) wouldn't
>append audio streams unless they were uncompressed PCM.
>

I've not usually had problems with audio streams, but it usually objects
to joining video streams unless they are from the same source, since
frame rate is stored in AVIs in terms of microseconds per frame, and
although both files may look like they're the same framerate, e.g.
23.976fps, in reality they may differ by the odd microsecond, e.g. 41709
and 41708 microseconds both round off to 23.976fps, but virtualdub won't
join them. I've tried loading a file, setting the frame rate explicitly
and then resaving in direct stream mode, but it doesn't always work as
you can't specify the rate in microseconds, only in fps, which as noted
above is ambiguous at the microsecond level.

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