GH5 shooting material , not working in hitiflm.
I don't know how to solve this problem.
We need to know information about your problem file(s). A full text report from the free MediaInfo utility program pasted into a post here is good.
My first guesses are that your media is either 10-bit AVC and/or 4:2:2 AVC. Hitfilm does not support either of these. 8-bit 4:2:0 AVC media is supported in Hitfilm. AVC also goes by the name H.264. The 10-bit and 422 AVC can be selected options on the GH5 if my memory serves me correctly. Such media needs to be transcoded to something Hitfilm can understand.
Convert to mov or mp4? it may work with the codex's?
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