The bottom line reality is that Bridge simply doesn't work with all video formats.
FFDShow is a real show stopper, often requiring a complete fresh installation of OS & programs.
I should add that I am using VirtualDub. There are lots of Codecs out there, just used these as I had them on my machine. the video processing software should be immaterial to the question. There are many other Codecs out there that may work or not to generate a thumb.
The real question is what does Bridge need to read the video file to generate a thumbnail, and how can this be facilitated? What are these specific Codecs (and others) doing that others are not to generate a thumb?
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You pose a good question. Unfortunately, I do not have an answer.
I will say that the thumbnail preview differs program to program. My ThumbsPlus 7 will show more thumbnails, than will Bridge. Windows Explorer in Thumbnail View will show others. IrfanView yet others. None show ALL, and each seems to differ in the files that they will use a thumbnail for. Some AV files show the generic icon in ALL of my various programs.
What's different? I haven't a clue. I have the correct display CODEC for each of the generic files, but no program shows the thumbnails for all. They will play properly on most of my players and G-Spot does not show any problem with the files that are icon-only. Now, I do not have FFDShow.
Good luck, and I hope that someone can give you a definitive answer.
The real question is what does Bridge need to read the video file to generate a thumbnail, and how can this be facilitated?
A fair question for the programmers of Bridge. But you'd have a better chance of them seeing it through a Feature Request than asking here.
I knew it was a long shot, but was hoping some video guru could say that Bridge looked at frame xx for information to generate information for the thumbnail. Perhaps then I could splice in the info at the correct spot. Or that specific rendering codex did ---- .
But apparently it is not that simple as the thumbnails must be generated with some information other that a frame image.
I am working on the Adobe angle also, but it will come as no suprise that this channel moves very slowly, if at all.
I came up with a workaround to get thumbnails for video that just have generic thumbs. Basically I took a snapshot for thumb and then set up a stack with video. For the whole step by step process see this link.