There is often a lot of confusion from people using MP4Box to create MP4 files or DASH content with a specific aspect ratio. This confusion often comes from badly-chosen acronyms in the MP4/DASH standards. In this post, we clarify what MP4Box uses and does. Continue reading Aspect Ratios
Tag Archives: MP4
Check key-frame alignment with MP4Box
⚠ The content of this page may be outdated.
Please refer to this page for more up to date information: https://github.com/gpac/gpac/wiki/Check-key-frame-alignment-with-MP4Box
Please refer to this page for more up to date information: https://github.com/gpac/gpac/wiki/Check-key-frame-alignment-with-MP4Box
Dear adaptive streaming followers,
Many of you reported issues when packaging your encoded content to respectively HLS or MPEG-DASH using GPAC (resp. the MP42TS and MP4Box tools). Most of the time, this is due to misalignment of key-frames across the different encoded qualities. In this article, we are going to show how to check key-frame alignment.
Continue reading Check key-frame alignment with MP4Box
Announcing MP4Box.js
MP4Box is a great command line tool for all sorts of file manipulations. Inspired by this tool, we decided to create a tool for Javascript-based manipulations of MP4 files. We are proud to announce MP4Box.js. Continue reading Announcing MP4Box.js
Improved language tagging in GPAC
⚠ The content of this page may be outdated.
Please refer to this page for more up to date information: https://github.com/gpac/gpac/wiki/Language-tagging-in-GPAC
Please refer to this page for more up to date information: https://github.com/gpac/gpac/wiki/Language-tagging-in-GPAC
We’ve recently improved the language tagging in GPAC, and in particular in MP4Box and in MP4Client. This posts gives details about how to use these new features. Continue reading Improved language tagging in GPAC
MP4 demuxer examples
⚠ The content of this page may be outdated.
Please refer to this page for more up to date information: https://github.com/gpac/gpac/wiki/MP4-demuxer-examples
Please refer to this page for more up to date information: https://github.com/gpac/gpac/wiki/MP4-demuxer-examples
Dear followers,
At the request of some people, we have added to GPAC some sample applications demonstrating how to use GPAC to demux MP4 files. They are not full applications, just examples taking some MP4 files as input and displaying some information about the media samples contained in the file.
So far, we have added 3 sample applications:
- a basic demuxer called ‘bmp4demux’ capable of reading and dispatching media access units from fragmented or non-fragmented MP4 files, progressively (i.e. while the file is being written);
- a segment based demux called ‘segmp4demuxer‘ capable of dispatching media units from media segments, where the input data is framed. This is what is used for the DASH support;
- and a more advanced demuxer, called ‘fmp4demux’ capable of dispatching media units in streaming mode (i.e. reclaiming resources once media units have been dispatched), where the input data comes from fragmented mp4 but is not framed, i.e. the data in the buffer passed to the demuxer does not start or end at segment or fragment boundaries.