Conversion to image series not supported

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What steps will reproduce the problem?
1. Add a conversion preset to output a series of images: ffmpeg commandline
input would be ffmpeg -i yourfile.avi -f image2 frame-%4d.png, producing an
image series frame-0001.png, frame-0002.png etc. So add a file extension of
png and commandline options of -f image2.
2. Since you can't change the output filename, you can't include a term
like the %4d used above to allow ffmpeg to include the frame number in the
output file.

What is the expected output? What do you see instead?
Only the first frame of the video file is output (as yourfile.png).

What version of the product are you using? On what operating system?
v0.42 on Linux (Debian)

Please provide any additional information below.
There are three ways to fix the problem:

1. Allow more than 3 character file extensions in the preset definition. 
That way you can use a file extension like %4d.png which would then produce
an image series numbered yourfile.0001.png, yourfile.0002.png, etc.
2. Allow manual definition of the output file so a numbering term can be
included.
3. Allow a suffix to the input filename to be added by the preset, as well
as the filename extension.  Then a suffix of -%4d could be added to the
input filename during conversion.

Original issue reported on code.google.com by paulbrim...@gmail.com on 24 Sep 2008 at 1:25

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Original comment by bgg...@gmail.com on 24 Sep 2008 at 5:35

• Changed state: Accepted

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Original comment by bgg...@gmail.com on 24 Sep 2008 at 5:36

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[deleted comment]

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max length of extension is now 20 characters

Original comment by bgg...@gmail.com on 9 Oct 2008 at 7:37