dschmidt commented on PR #3114:
URL: https://github.com/apache/tika/pull/3114#issuecomment-5501558113

   Honestly, having sat with this for a bit: I am not sure any more that it is 
worth it.
   
   I built it for #3115, where the video trailing a motion photo has to be 
typed before it is emitted. It turns out not to buy anything there, because the 
embedded parse runs `MP4Parser`, which sets the type correctly anyway.
   
   That is the general picture, too. `MP4Parser` already does what this 
detector does: `isAudioOnly` marks an audio-only file as `audio/mp4`, and the 
compatible brand list gets `testMP4Video.mp4` to `video/mp4`, which 
`MP4ParserTest` asserts today. Both files attached to TIKA-3646 are already 
typed correctly after a parse. What is left over is detect-only callers, and I 
do not have a real use case for that beyond tidiness.
   
   So folding it into the parser would mostly mean writing what the parser 
already does. As I see it:
   
   1. Close this, and answer TIKA-3646 with "the parse gets it right, detection 
alone does not".
   2. Keep the detector, but opt-in only (`spi = false`, the way 
`Pkcs7Detector` is), for callers that need the type without a parse.
   3. Keep only the `Mp4Boxes` extraction, which shares the box primitives 
instead of leaving a third copy of a box walk around, and drop the detector.
   
   I lean towards 1, or 3 if the shared primitives are worth keeping on their 
own. Your call.
   


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