<html> <head> <style> .hmmessage P { margin:0px; padding:0px } body.hmmessage { FONT-SIZE: 9pt; FONT-FAMILY:Tahoma } </style> </head> <body class='hmmessage'> I have  write a similiar application using a mechanism like appsrc, although I implement in videotestsrc. My design is that use mplayer in background  and  use shared memory  to  copy the  mplayer  out frame to  videotestsrc. The reasons are: 1. I find gstreamer seek process is very slow.  Especially when you need do seeking in frame precision. 2. leak of a powerful demux/decoder plugin compared with mplayer.  3. key control functions has been realized in mplayer, and can be customized. and I want someone to review my design and give advices. I think the playback speed is not your application concerns, but maybe it will be a good extension. > Date: Fri, 11 Apr 2008 10:56:22 -0700 > From: ds@schleef.org > To: etoffin@ulb.ac.be > CC: gstreamer-devel@lists.sourceforge.net > Subject: Re: [gst-devel] Looking for someone who can code a (small ?) app for me… > > On Fri, Apr 11, 2008 at 11:22:59AM +0200, Etienne Toffin wrote: > > So I thought about writing a small video program that would be an all- > > in-one software : > > - video player (with precise controls such as frame by frame playing; > > allowing video or image stacks playing) > > - keyboard shortcuts that can be easily defined for a behaviour (for > > example Ctrl-D for "ant begins to drink" and Ctrl-L for "ant stops > > drinking and leaves the food source") > > - mouse ability to click on the video where the behaviour occurs (to > > measure the cartesian coordinates) > > - recording of the time where shortcuts are entered and the cartesian > > coordinates of the ant showing the behaviour > > - timeline where already recorded values are shown as the video file > > is replayed (it's often necessary to make our measurements in several > > times as there can be a lot of ants to observe at once) > > - interface allowing video calibration : sometimes we have to film the > > experiment not from above and the experimental setup is then deformed > > on the video (circle becomes an ellipsis). Then we need a simple > > calibration interface to automatically convert the measured > > coordinates in real coordinates > > This software would be written with Gstreamer and Python (I've heard > > that it would be the best solution) and could be used on Linux, OSX > > and Windows. > > I've needed something similar for testing the encoder in Schroedinger. > Right now, I have a simple python script that plays files, occasionally > pausing and stepping the video forward and backward. At some point, > I would like to be able to easily annotate individual frames or > segments, including marking areas that are not encoded well. The > resulting annotations would be fed into the quality control > infrastructure, so automation is a primary goal. > > Such a project isn't very high on my priority list, and will only > get bumped up when it starts to block other things that are higher > priority. I would, however, assist with anyone taking up such a > project. > > > > dave... > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > Don't miss this year's exciting event. There's still time to save $100. > Use priority code J8TL2D2. > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > _______________________________________________ > gstreamer-devel mailing list > gstreamer-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel <hr />轻松把Hotmail下载到本地，试试 Windows Live Mail。 <a href='http://get.live.com/wl/all' target='_new'>立即尝试！</a></body> </html>