Am 16.06.2022 um 09:33 schrieb Gyan Doshi:
On 2022-06-16 12:45 pm, Michael Koch wrote:
I would like to understand why in some cases -loop 1 is required
before the input files, and in some cases it can be omitted.
-loop option is specific to the image sequence demuxer. Without it, a
single image input is a video stream of 1 frame length.
But why does this example work without -loop 1? Is it an undocumented
feature of the remap filter, that it keeps the last mapping file alive?
ffmpeg -i in.mp4 -i xmap.pgm -i ymap.pgm -lavfi [0][1][2]remap out.mp4
You would apply loop when you need to keep alive an image sequence
input at a timestamp beyond its natural length, usually a fade.
With the tpad or loop filters, this can be done inside a filtergraph
instead of at the demuxer level.
Which method is better, -loop 1 before the input file, or doing it in
the filtergraph?
Michael
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