No thumbnalis on the final output of DVD.and taking two hours in rendering menu.
The "2 hours rendering menu" and empty thumbnail issue are related to the same problem: ConvertX fail to seek in the source in the appropriate time.
It is very hard to seek accurately in a source file, especially if this source file is a composition of sources from several files, plus consideration of GOP (Group of Picture starting with an I-Frame) which make it even harder.
So, ConvertX does a seek a few seconds before the needed seek point, and decode to get the first valid picture at the requested time (or after).
But for some reason, this valid picture at the correct timestamp never come, nevertheless the entire source(s) file(s) are parsed and decoded.
This is what make the insane slowdown and the fact that the thumbnails are empty as after having parsed all the file without finding a good image, a black one is provided.
Obviously the code with composition of several files is broken in that behalf. It's been added to the buglist :
http://bugs.vso-software.fr/view.php?id=13595Stay tuned but I won't risk a time estimation for the fix as this is a very hard issue to solve, because touching this part usually break something elsewhere. So we are very careful with this.
Jacques.
VSO Software Team Member