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PhotoPrism may use ffmpeg to transcode common video formats to MPEG-4 AVC. This container / codec combination doesn't require transcoding as it can be played natively by most modern browsers, see

For a list of codecs ffmpeg supports, run this command in a terminal:

ffmpeg -decoders

Note that Firefox may only play the corresponding AAC audio codec if the operating system supports it, see

All other browsers shouldn't have any issues.


While the QuickTime .mov container format served as the basis for MPEG-4, there are differences and the two are not quite interchangeable. They still play in most browsers and won't be transcoded automatically for this reason.