Dear,

Playing a MOV clip to a project, I can hear the audio but see no video.
Other formats eg ogg are ok.

kdenlive does not complain, throw up errors or similar, I just don't see any video.

Ter info, VLC also had the same problem until I turned off "accelerated video (overlay)" in the configuration, then it played ok, audio and video.

Any suggestions as to where I could look, warmly appreciated,
Alasdair

Collect information first:

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 ffprobe a.MOV 2>&1 | grep Stream

If one video exists in the MOV container, it is converted to a format that can be edited (replace $X with the threads of your CPU):

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ffmpeg -i a.MOV -c:v ffv1 -threads $X -context 1 -slices 30 -c:a flac -sample_fmt s16 a_ffv1.mkv

Alternatively, only the first minute of the video:

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ffmpeg -i a.MOV -ss 0:00:00.000 -to 0:01:00.000 -c:v ffv1 -threads $X -context 1 -slices 30 -c:a flac -sample_fmt s16 a_ffv1.mkv

The result should work. If not, report again (and don't forget the info about the video).