video_2500000bps_0.mp4 possibly contains invalid mdat #131

Summary

It looks like video_2500000bps_0.mp4 has two mdat boxes, but the second one is incomplete.

Steps to reproduce

1. In a local checkout, note the size of this file - 1030669 bytes
2. Inspect box at https://gpac.github.io/mp4box.js/test/filereader.html?https://mpeggroup.github.io/FileFormatConformance/files/published/green/video_2500000bps_0.mp4
3. Switch to Box view and select second mdat node in Box Tree View.
4. Note the size (654034) and start (677245) values. For those values, the length of the file would need to be 1331279.

I've checked the MD5 - looks to match the JSON entry.

Affected specifications

• ISO/IEC 14496-12

Affected files

• video_2500000bps_0.mp4