Add png sequence output for vid_gen#1117

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CarlGao4 wants to merge 5 commits intoleejet:masterfrom

CarlGao4:vid-png-seq

Commits on Dec 19, 2025

Add png sequence output for vid_gen
CarlGao4
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Commits on Dec 20, 2025

Add support of pic sequence for both png and jpg, video and image output, support first frame index
CarlGao4
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Do not change the original sequencial file name strategy
CarlGao4
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Commits on Dec 21, 2025

output-begin-idx will also affect if it is set even no format specifier is used
CarlGao4
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Commits on Dec 25, 2025

Restructure saving branches
CarlGao4
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