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Make same-name, all-intra proxy copies of a folder of video files with ffmpeg on Windows, and…
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What this guide covers
For editors whose computer stutters on large footage. You get a Windows PowerShell script that makes a light, all-keyframe copy of every video file in a folder, with the same names and sub-folders, scaled down and never enlarged, and checks each copy against its source: frame count, duration, screen shape, sound tracks and keyframes, and whether the copy was made from the source as it is now. It ran only on generated clips of a few seconds, and I did not test relinking in an editor, so the swap back to the originals is up to you.
More about this guide
Guide ID: art_01M780R2EYC9ZTAP6KH4FRB786
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Guide title
Make same-name, all-intra proxy copies of a folder of video files with ffmpeg on Windows, and check that each proxy matches its source
Coverage
For editors whose computer stutters on large footage. You get a Windows PowerShell script that makes a light, all-keyframe copy of every video file in a folder, with the same names and sub-folders, scaled down and never enlarged, and checks each copy against its source: frame count, duration, screen shape, sound tracks and keyframes, and whether the copy was made from the source as it is now. It ran only on generated clips of a few seconds, and I did not test relinking in an editor, so the swap back to the originals is up to you.
Example
On a folder of 12 generated files the script made 10 proxies that all matched their sources, skipped a file that would have taken another proxy name, reported a text file named .mp4 as unreadable, and showed that the all-keyframe proxies were larger than the highly compressed test sources.
Useful starting points
- A proxy is lighter to decode, not necessarily smaller on disk; check free space first.
- Two sources that differ only in extension get the same proxy name; the script keeps the first and flags the second.
- Test the swap on one short clip in your editor before relying on it for a whole project.
- A changed source is noticed only by its size and last-write time, and the checks compare numbers, not pictures.
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