speeding up a movie

In article <yzl8x7ctsn5.fsf RemoveThis @news.dtpq.com>,
cstacy RemoveThis @news.dtpq.com (Christopher C. Stacy) wrote:

> I recorded a Quicktime movie, and I would like to make
> a version of it that plays back about 4 times faster.
> (Yes, with the people all running around speeded up.)
> How can I do this?
>
> Programs I currently have at my disposal: Quicktime Pro,
> ffmpeg, VLC, iMovie and iDVD. When I'm done I want
> another Quicktime movie that I can play on my Mac and
> also give to my friends who have Windows (and Quicktime).
> I have little idea what I'm doing (as should be obvious).

Good question. If a gun was put to my head (say if Smith and
Wesson were to heavy me together), I would drop a lot of frames
in QT Pro and give a sort of illusion of speeded up. What you
would be really doing is playing at the same rate (or more if you
have room to move here when exporting), but there being less
reality depicted (you having trashed some of it), one would see
changes quicker. No sooner would Munny walk into that saloon in
the final scene of Unforgiven, than the many lowdown creeps
inside would be deadums...

--
dorayme

On 12/9/07 05:27, "Christopher C. Stacy" wrote:
>
> I recorded a Quicktime movie, and I would like to make
> a version of it that plays back about 4 times faster.
> (Yes, with the people all running around speeded up.)
> How can I do this?
>
> Programs I currently have at my disposal: Quicktime Pro...

Open your movie in QuickTime Pro and export it as an Image
Sequence. In the export options panel, select an image format
and the number of "frames per second" you want saving. If your
original movie was at 30 frames per second, then save set the
frames per second to 7.5 (i.e. one quarter the original frame
rate). The exported frames will be numbered, which helps in
the next step. For neatness, export the frames to a new folder
all their own.

Still in QT Pro, use Open Image Sequence to import those frames
into a new movie. Select the first image in the sequence and,
at the prompt, select the same frame rate as your original
movie file.

If your movie had audio, you'll have to extract that and deal
with that in some other app, and then paste it into the new
movie.

Export using whatever codec you prefer.

Stuart

Stuart Rogers <stuart.rogers.clara.co.uk.DeleteThis@deadmail.co.uk> writes:
> If your original movie was at 30 frames per second, then save set
> the frames per second to 7.5

This seems backwards, because my original has 9.05 FPS,
but I want to play it back at around 30 FPS. I don't want
to sample (drop frames), I want all the frames to be there,
but the total playback time to decrease.

Are you saying it right, or is my head spinning?