Note: Although the post shows a full re-encode being done, I am not sure whether that is actually needed – it should be enough to just remux with -codec copy -movflags faststart and avoid the quality loss. (In other words, you're not the first to want to do this – it's everyday business for web browsers.) It is usually at the end for freshly encoded files because the encoder might not know what values to write until it's done encoding the whole video (especially the parts needed for seeking).īut when preparing MP4 files for online streaming, it is common to move metadata to the beginning, e.g. MP4 files can have the metadata chunk at the beginning or at the end.
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