[FFmpeg-devel] Support forced first frame in image sequences

[Jimmy Christensen]

I've attached a proposal for adding forced first frame in image 
sequences. It's a sort of proof of concept and the code is not pretty. 
But what do you think of the implementation?

Current :
input.%04d.dpx -
	input.0000.dpx
	input.0001.dpx
	input.0002.dpx
	input.0003.dpx
	input.0004.dpx

After patch :
input.%04d.dpx -
	input.0000.dpx
	input.0001.dpx
	input.0002.dpx
	input.0003.dpx
	input.0004.dpx

input.%04~25d.dpx -
	input.0025.dpx
	input.0026.dpx
	input.0027.dpx
	input.0028.dpx
	input.0029.dpx

I wanted to avoid another parameter. It's only relevant for image 
sequences, since they don't always start at 0-4.

-- 
Best Regards
Jimmy Christensen
Developer
Ghost A/S
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