Positioning media on a key frame

Hi,
I'm new to jmf, but I made a lot of things myself. I'm able to play video files (xvid, using jffmpeg), took the cut.java from the solutions and adopted to my needs. But I'm having a small annoyance with the cutting.
When I try to cut the video on a frame that is not a key frame I get audio/video desyncronization. The thing is that the cut.java program starts cutting the video from a key frame, that could be some 5-10 frames after the current (selected) frame.(I set my video files to have a key frame every 15 frames at most)
So an easy solution to my problem would be to set the starting point of the cutting on a key frame. And my question is: How to set the media time of my player/processor to a key frame?
I need something like processor.positionOnNextKeyFrame().
Thanks,
Bojan

Thanks for the reply,
I saw that one but somehow I cannot find out how to get the buffer from the processor? I tried the code from cut.java but I didn't like to go through every step when I have already loaded the file in a processor. Somehow I lost my self in that. Maybe it is the solution...
I was researching and found out that there might be a way if I could somehow get the Track from the processor. Track interface has a method:
readFrame(Buffer buffer) - Reads the next frame for this Track
So if I could get the track then I would be able to loop through the frames and do this check:
if ((buf.getFlags() & Buffer.FLAG_KEY_FRAME) != 0)
So how do I get the Track? Through the TrackControl somehow?
Thanks again

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I used position keyframes to move the footage to the right, in different positions near the right side of the sequence frame (not all the same position), in preparation for a split frame crop effect. Between keyframes the footage jumps back to the original position. I selected all the key frames and did a rightclick and set Temporal and Spatial interpolation to Linear or Bezier - but that doesn't do anything at all. What am I missing?

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Hey, me again.
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Scot

Normally if you have the selection tool (a) active
all you do is click and drag. You might have better
luck with the pen tool (p) itself, but enlarge your
view in the Timeline so you don't add more keyframes
by mistake. Another option is to do it numerically in
the Viewer: position the playhead right on the
keyframe and type the new value into the appropriate
field. Working bigger has made adjusting keyframes
alot easier for me. Not very prfound help...but it's
what I know.
Dual
G5/2.5GHz/4.5 GB, internal ATA, G-SATA 500 Mac
OS X (10.4.6) Final Cut Studio
Thanks a lot for your help.
what you meant
"Another option is to do it numerically in the Viewer: position the playhead right on the keyframe and type the new value into the appropriate field."
only permits to position the new KF at the new place. Is that right ?
not to erase the previous one.
As a matter of fact I tried what you and Brian suggested and I could manage.
Bernard

Extraction Key Frames from a video

Hi all,
I would like to know what is the best way to extract keyframe from a video.
My Status (butr I can cahnge it)
I'm Marco and I'm using JMF; I need for an help because I don't know how to extract keyframes from AVI and MPG files.
I'm using the code posted in this forum for extracting all frame in a video with the adding of an if expression that in the accessFrame method that I report below:
void accessFrame(Buffer frame) {
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try {
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Graphics og = outImage.getGraphics();
og.drawImage(stopImage, 0, 0, size.width, size.height, null);
Iterator writers = ImageIO.getImageWritersByFormatName("jpg");
ImageWriter writer = (ImageWriter) writers.next();
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if ((frame.getFlags() & Buffer.FLAG_KEY_FRAME) != 0){{color}
{color:#ff9900}
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writer.setOutput(ios);
{color:#ff9900}
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} catch (IOException e) {{color}
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Cheers and thank u
Marco

>
With the code yoodleyee posted, frames can be extracted and converted from the raw decoded format into images, but no guarantee that the frame extracted is a key frame, isnt it?Actually, there is such a guarantee...because the FrameGrabbingControl isn't implemented in any video format that uses keyframes. So, if it works, then every frame of the video is a keyframe, and it won't work otherwise.
How can key frames be detected with JMF and then extracted with the code provided? Any tutorial or sample code about that?They can't be. You can write a custom codec that will give you access to every frame, regardless of the format, if you're wanting to get all of the frames.
Example: [http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/FrameAccess.html]
But JMF doesn't have any way of dealing with key frames directly, at least that I am aware of.

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<-----
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---->
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Sheesh!
Much appreciated.

Go to the first frame of the clip in question. Double click it to open in the viewer. Go to the motion tab. Position it as you want it to be.
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Adjust each of the parameters to taste. FCP will automatically add keyframes where a change has taken place. Render if necessary and take a look. Tweak to taste.
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Hi JPo,
Thank you for the very interesting Post. The trouble began when I lost all my Key Frames. I restarted by selecting an existing shape from the Bin in the Geometry Room. I then set a Key Frame. The Key Frame appeared on the Time Line, but was not highlighted so it was not active. If instead, I pressed "New" to create a new shape all went well.
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Again, many thanks,
David Cape.

Positioning media on a key frame

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