Bill Evans wrote:
I'm trying to implement a simple image grabber, either as a (user)
filter or perhaps differently. I'd like to be able to:
(1) specify a specific time (or frame) in a .nuv file and grab that
frame as a jpeg; I know I don't know enough about the frame process to
know the best way to do it, but I'd like it to be as complete a frame
as possible (without pixelation, incomplete blocks, etc).
The current method of using mplayer and the "-vo jpeg:..." works in
that it'll create a lot of jpeg images for me. However, I really
don't want to create that many images and don't want to go through
them all. When I specify an offset into the show (with "-sb x" or
"-ss x") and limit it with "-frames 10", it starts giving me partial
blocks. I have to use 10 for frames since it does not tend to give me
an image if I specify only 1 frame.
I'm doing this wrong. Even if I'm close to doing it correctly with
this tool, it doesn't seem to be the most efficient. When asking
mplayer to go "deep" into a show, it appears to take a while
processing everything ahead of it. I'm sure that this is possible at
least on a small level, but is there a better way?
(2) Anyway, once this works consistently and accurately, I'd like to
automate it into a script so that I can call it as a user filter. I'd
like to be able to look in the mysql database and find either the
bookmark's location or use editing marks to determine which frame(s)
to grab as images. (Where to store them is secondary at this point
and, I suspect, easy to safely configure.)
I don't really care at this point if the images are useful to current
mythtv programs; though that is perhaps my #3 goal, the first two
would be a 90% solution for my needs.
This is very similar to what Risto Treksler's patch for the MythTV
preview images does. It creates a PNG thumbnail image by taking into
account the user-specified offset, the commercial cutlist, and--if set
to generate a preview pixmap from the bookmark location--the bookmark
location.
http://www.gossamer-threads.com/lists/mythtv/commits/129006#129006
So, what problem are you attempting to fix here? Are you just trying to
create a way to force creation of thumbnails or planning to use the
JPEG's for DVD menu creation or ... ?
Mike
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