Python Video processing.

2006-06-13 Thread Ant 
Hi all,

I have a specific task I want to automate - rotating a video file
through 90 degrees.

I've used the PIL library quite a bit to perform batch processing on
images, and would like to do similar on video. Can anyone see a problem
with the following:

1) Use pymedia to convert the video into a sequence of stills (e.g.
http://pymedia.org/tut/src/dump_video.py.html)
2) Use PIL to process each still
3) Use pymedia to re-pack the still into video format.

In particular, does anyone know whether the data obtained from decoding
the video frame as in the following snippet from
http://pymedia.org/tut/src/dump_video.py.html:

  dd= d.convert( fmt )
  img= pygame.image.fromstring( dd.data, dd.size, RGB )

can be directly loaded into a PIL Image object (and back again?)?

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Re: Python Video processing.

2006-06-13 Thread Fredrik Lundh 
Ant [EMAIL PROTECTED] wrote:

 In particular, does anyone know whether the data obtained from decoding
 the video frame as in the following snippet from
 http://pymedia.org/tut/src/dump_video.py.html:

  dd= d.convert( fmt )
  img= pygame.image.fromstring( dd.data, dd.size, RGB )

 can be directly loaded into a PIL Image object (and back again?)?

iirc, the pygame fromstring/tostring methods are designed to be data-compatible
with PIL's corresponding methods, so you should be able to do

im = Image.fromstring(RGB, dd.size, dd.data)

instead of doing that pygame.image call (not that the argument order is 
different).

for details, see the pygame tostring/fromstring docs, and the corresponding PIL
methods:

http://www.pygame.org/docs/ref/image.html
http://www.pythonware.com/library/pil/handbook/image.htm

hope this helps!

/F 



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Re: Python Video processing.

2006-06-13 Thread Ant 
 im = Image.fromstring(RGB, dd.size, dd.data)

 instead of doing that pygame.image call (not that the argument order is 
 different).

 for details, see the pygame tostring/fromstring docs, and the corresponding 
 PIL
 methods:

That's starting to look promising, yes - thanks! I'll give it a shot
this evening and see what happens...

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