Check out some options how mp4 files might be converted to sb3 format.
mp4 to sb3 conversion is probably searched by users that want to recover / import back previously exported Scratch files. In the case of MP4 files, this was most likely previous export to SWF content further converted to MP4. Unfortunately, the reverse is not doable, not with Scratch, nor with any other converter.
Unfortunately, there is no detailed software record in the database for this conversion.
This conversion entry was verified by us and conversion from mp4 to sb3 was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it can't be done because incompatibility between programs, caused by closed file formats, very limited support or by other problems.
If you find entry that you feel is flagged as bad wrongly, please tell us in the discussion form below with as much as information as possible so we can fix it.
Additional links: Open mp4 file, Open sb3 file
MP4
An mp4 file extension is typically used for MPEG-4 multimedia files defined by ISO 14496-1 standard. Commonly used for video and movie files and supported by vast number of media players.
SB3
Files with sb3 extension can be pretty much always found as projects from the Scratch 3.0 development tool.
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