Okay I will split this into 2 parts to make everything easier. This basic test revolves around a directory of 26 files. A mixture of avi and wmv files. What I was trying to do was create an individual 5x2 screenshot of each video file and then combine all 26 screenshots into a combined single sheet using the "Combine all files in one picture" option.
I FOUND THE FOLLOWING TWO PROBLEMS:
1. Files are showing as successfully created, but are not infact created. Before the combined sheet can be created, VTM creates the individual sheets based on the preset chosen. Problem is that on one of the files, the individual output file was not created, but when checking the combined sheet - the 5x2 image was in fact present!
Even when I am not outputting to a combined sheet, I have had this problem where the program shows that the thumbsheet was created successfully (the name is not in bold in the file area) but no jpg file can be found. This problem I have been experiencing in every version since 18.104.22.168 came out.
2. It seems that when a whole bunch of videos are dropped and then "Combine all files in one picture" is checked at the bottom, if a single file or multiple files screenshot fails to get created, then the total combined image does not get created. VTM needs to be told to ignore the single/multiple individual file failures and still produce the combined sheet as requested with the videos that have been successful.
Of the 26 files I tested, one of the files failed sometimes, but not all the time. So it was hit and miss. Sometimes a sheet was produced and sometimes it wasn't. The problem is that maybe it will or maybe it won't is not the best way to go about this. Either VTM is able to render the file to create the sheet or it isn't. The problem with this individual failure means that I have to start from the beginning if I want a combined sheet. Even though 25 individual sheets were successful, the problem that one failed yet it sometimes works means that I just have to risk doing it all again in the hope that the failed file will successfully be created as a sheet so that it can then be combined with all the other sheets.
>>UPDATE: I just did 6 tests with regards to when this actual file fails. This wmv file is successful when individually dragged and dropped to create a single sheet. However when it is dragged and dropped as part of the 26 files, it failed on 3 out of 6 occasions when "Sorted" was clicked. On the other 3 occassions "Sorted" was NOT CLICKED and this file rendered correctly and an individual and combined sheet was successfully created. So selecting SORTED must clearly cause some sort of internal issue.
My thoughts on fixing this problem:
-2.1 If the file fails to render and the "combine all files in one picture" is checked, then VTM should do a 2nd pass at the failed file to see if it can make the sheet. Afterall if it could make a sheet individually before hand, there should be no reason why it is failing now when asked to create it as part of a combined effort.
-2.2 If it has created 25 of 26 successful thumbnails and the remaining file allows to finally create a thumbsheet on its own, then it would be nice if VTM could just see these 26 jpg files and then create a combined sheet afterwards. This would save time having to create 25 jpg files AGAIN when there is no need to do so. Basically how this would work is that after we see the failed file (and a 2nd pass doesn't work - 2.1 above), we drag it INDIVIDUALLY into the file area and get it to create a 5x2 thumbsheet, and we check the box "Combine all files in one picture" - yeah I know what you are saying - this doesn't make sense for just one file, however VTM then notices all the other jpg files in the SAME DIRECTORY and then just combines those with the single one that it is outputting. If "Sorted" is clicked then they are organised alphabetically.