sofia

And, in the dream, I knew that he was, going on ahead. He was fixin' to make a fire somewhere out there in all that dark and cold. And I knew that whenever I got there, he'd be there. And then I woke up.

No Country for Old Men (2007)

features

• Remuxer.Initialize: Writes a 16-byte mdat (Media Data) header directly to the io.WriteSeeker.
• Remuxer.AddSegment: Appends raw media sample payloads directly to the io.WriteSeeker file as segments are processed.
• Remuxer.Finish: Appends the final moov metadata box to the end of the io.WriteSeeker file, and seeks backward to overwrite the mdat placeholder size with the final calculated byte size.
• Decrypt: Applies an AES-CTR XOR key stream directly onto the data byte slice. If this slice is backed by a memory-mapped file, it modifies the file on disk in-place.
• MoovBox.RemovePssh: Mutates the in-memory MoovBox to strip out all PSSH (Protection System Specific Header) boxes, altering the structure before it is written to a file.
• MoovBox.RemoveMvex: Mutates the in-memory MoovBox to strip out the mvex (Movie Extends) boxes, altering the structure before it is written to a file.
• TrakBox.RemoveEdts: Mutates the in-memory TrakBox to strip out the edts (Edit List) boxes, altering the structure before it is written to a file.
• StsdBox.RemoveSinf: Mutates the in-memory StsdBox to strip out the sinf (Protection Scheme Information) boxes and alters the entry header format, altering the structure before it is written to a file.
• MvhdBox.SetDuration: Mutates the in-memory MvhdBox to update the total duration of the movie, automatically adjusting the version flag if a 64-bit size is required.
• MdhdBox.SetDuration: Mutates the in-memory MdhdBox to update the media duration, automatically adjusting the version flag if a 64-bit size is required.

prior art

1. mozilla/mp4parse-rust#415
2. Eyevinn/mp4ff#311
3. alfg/mp4-rust#132
4. yapingcat/gomedia#115
5. alfg/mp4#27
6. abema/go-mp4#13
7. garden4hu/fmp4parser-go#4
8. eswarantg/mp4box#3
9. miquels/mp4#2

standard

ISO/IEC 14496-12: https://wikipedia.org/wiki/ISO_base_media_file_format

ISO/IEC 14496-14: https://wikipedia.org/wiki/MP4_file_format

ISO/IEC 23001-7: https://wikipedia.org/wiki/MPEG_Common_Encryption

Discord

https://discord.com/invite/rMFzDRQhSx