"Best" processing order for TiVo files?

[dlflannery]

I realize this is not entirely a new question and I am aware of previous VRD staff posts (this one (http://www.videoredo.net/msgBoard/showpost.php?p=20783&postcount=34)and this one (http://www.videoredo.net/msgBoard/showpost.php?p=20790&postcount=2)) that are relevant, although more than a year old.

Starting with a TiVo file and considering the following processing options targeting an adscan/edited mpeg2 result:

1. Adscan/Edit
2. QSF --> Adscan/Edit
3. Adscan/Edit --> QSF

Questions:
1. Is one generally superior in terms of correcting/avoiding audio sync or any other defects? (i.e., averaged over a wide variety of TiVo input files.)
2. Is one better for some types of defects while another is better for another type?
3. Can there be cases where 2) or 3) are better than 1) (i.e. where including QSF makes an improvement over just adscan/edit/save )?

If sequence 3) can sometimes be best, I will have to consider modifying TVAP (see signature) since that is the one sequence it cannot do!

Thanks

[phd]

It is preferable to run QSF before AD scan under the following circumstances:

1. You receive the warning in VRD to run QSF
2. You have problems navigating the file
3. The time length of the file appears wrong.

From the Help file:

The key purpose of QuickStream Fix is to re-align the time stamps in the output file. Sometimes, video captured from DVB Satellite or sourced from DVD VOB or VRO files may have internal time stamps that are not sequential. When you normally open a file in VideoReDo it will search for these non-sequential time stamps and handle them gracefully. Occasionally it is unable to do so effectively and the QuickStream Fix function will prove useful.

[dlflannery]

Thanks, Pat,

My conclusion is there is no incentive to modify TVAP to allow AdScan before QSF.

My policy, and my recommendation to all TVAP users, is to always run a QSF first on a TiVo file. It may not be needed in most cases but it provides insurance against the occasional defective file. It takes relatively little time and can do no harm. (The other obvious strategy is to never run QSF's unless forced to go back and do so. I think my recommended strategy fits better in the automated TVAP situation, where no operator attention is needed to add the QSF step.)