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Posted by Alpha on 10/11/20 11:32
"Bob" <spam@uce.gov> wrote in message
news:438055c0.65965078@news-server.houston.rr.com...
> On Sun, 20 Nov 2005 02:08:38 GMT, spam@uce.gov (Bob) wrote:
>
> Here are the results of the tests I promised.
>
> With MF4 I had severe problems with two different clips, call them
> Clip A and Clip B.
>
> Clip A: The clip was a music video which I ran thru VRD QuickStream
> Fix to make sure it was DVD compliant and to correct any problems. The
> clip played just fine on both hardware and software DVD players. I
> imported it into MF4, added text overlay (Enhanced Video Text) and
> exported it. Then I played it and the audio was out of sync. I ran it
> thru VRD QS but that did not fix the problem. I then used VRD Adjust
> Audio Synchronization and discovered that the audio was 1/2 second
> off. I corrected that and imported it into MF4 which accepted it. I
> them went thru the same procedure with TDA and the clip played without
> any problems - so I did not have to adjust the audio sync like I did
> with MF4. This shows that MF4 caused the audio to go out of sync.
>
> Clip B: This clip was also a music video which would not import
> properly into MF4. It took a very long time to process it and it did
> not display any video when it finally finished the import. The
> exported clip would not even play and was only 10% of the original
> size. The only way I could work around this problem was to make a DVD
> copy and work from that disc. The import and export from the copy disc
> worked in MF4. I then tried the same thing with TDA and had no
> problems - the original clip that crippled MF4 worked fine in TDA.
>
> So there you have it, sports fans, two instances in which a perfectly
> good clip which runs fine in hardware and software players and work
> fine with TDA causes MF4 not to work properly. This was not caused by
> operator error, as has been alluded to before, and it was not caused
> by bad source material, as has neen alluded to before. The reality,for
> those who can accept reality, is that MF4 has some very serious bugs,
> The good news is that TDA works with both those clips.
>
> FWIW.
This summary is helpful.
I have never replicated your problem, although I have tried, and I for one
have never suggested operator error. Of course, I have different input
files.
The main issue IMO is the latitude in structure for the thing called mpeg.
There is not just one way to go about encoding, etc. Because the mpeg
format is a loose layering of two psychophysical models of compression (one
for video, the other for audio) with complex multiplexing, it is very easy
for a program to 1. screw up the synch and 2. fail to account for all
possibilities of input files. That is why you have to try various programs
out with various input files.
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