Hi!
Ralph Glasstetter wrote:
> Am Dienstag, 29. Mai 2007 08:45 schrieb Michael Riepe:
>
>>You could extract the raw MP2 audio streams from both versions, e.g. with
>>
>> tcextract -i input.mpg -x mp2 -a <trackno> > output.mp2
>>
>>and compare them.
>>
>
>
> You are right... as usual... ALL 4 MP2 streams are identical!!! :)
Not in every case. I already had two files with slightly different audio
tracks. In both cases, r35 left some garbage at the beginning of the
stream while r36-to-be didn't. In one case, there was another difference
somewhere inside the stream. I'll have to investigate that more closely.
Maybe r35 left some garbage before and after a cut.
By the way: a nice tool to compare audio streams is "xdelta":
xdelta delta stream1.mp2 stream2.mp2 stream12.delta
calculates the "difference" and
xdelta info stream12.delta
shows how many bytes have been inserted. Of course you can also use the
length of the delta file as a rough indicator.
> So... what's the difference concerning the new method? Does it just show up
> when we have a broken stream?
Or when the audio frames aren't aligned.
Michael.
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