An MP4 file first draft

• fq

  47 9,740 9.5 Go

  jq for binary formats - tool, language and decoders for working with binary and text formats

  It also has requirements on the box tree structure and order and what boxes are required/optional. Then there are also mapping per codec (see https://mp4ra.org/) that has additional requirements on boxes and how the samples should be encoded.

  For example PNG in MP4 is mapped by having a stsd (sample descriptor) box that has a mp4v format/box which itself should includes a esds (mpeg elementary stream descriptor) box which will include a decode configuration stating that the stream type is video and the object type is PNG.

  You can see a decode using fq (https://github.com/wader/fq) of the file used in the poster here https://twitter.com/mwader/status/1596219922304360448

  Hope that was helpful

• SaaSHub

  www.saashub.com featured

  SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

  

• pics

  12 10,463 7.4 Assembly

  File formats dissections and more...

  

  Author's github: https://github.com/corkami/pics

  He works on things like hash collisions, image files that contain an image of their own hash, "polyglot" files and such like.

  I think this is intended as a "minimum viable mp4 file" to show what the required binary parts are.

• FFmpeg

  493 45,210 10.0 C

  Mirror of https://git.ffmpeg.org/ffmpeg.git

  

  If you want to go deep ISO-14496-12 is probably what your looking for. You can either pay ISO to read it or hypothetically you can google for "filetype:pdf ISO-14496-12". For how things actually work in practice https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/mov... is a good resource.

• mp4analyser

  1 88 4.9 Python

  mp4 file analyser written in Python

  It might not have the prettiest UI, but I've used this one several times when troubleshooting encoder/muxer issues: https://github.com/essential61/mp4analyser.

• MP4Inspector

  2 68 1.3 JavaScript

  A Chrome extension to help you inspect Mp4 video content and find irregularities in video streams.

  

• Vrmac

  46 109 3.6 C#

  Vrmac Graphics, a cross-platform graphics library for .NET. Supports 3D, 2D, and accelerated video playback. Works on Windows 10 and Raspberry Pi4.

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