Fg-selective-videos-lossy.bin

Some implementations place the index at the end. This allows the recorder to append new video clips without rewriting the header.

Example hexdump snippet (imagined but realistic):

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
00000000  46 47 53 56 01 00 00 00 04 00 00 00 00 00 10 00  FGSV....4......
00000010  00 00 05 00 00 00 00 20 00 00 01 02 03 04 05 06  ....... ........

Here, 46 47 53 56 is the magic, 01 = version 1, 04 00 00 00 = 4 clips. fg-selective-videos-lossy.bin

The design choices implied by this filename reveal a clear trade-off between fidelity and efficiency:

In gaming development or modding, "fg" can sometimes refer to "Fragment" or specific internal asset tags. Some implementations place the index at the end

Because this is a proprietary format, standard video players (VLC, Windows Media Player) will not open it. Here are proven strategies:

The most probable origin is software that uses AI to remove or alter video backgrounds (e.g., video conferencing tools like Zoom/Teams background effects, or editors like CapCut/After Effects plugins). Here, 46 47 53 56 is the magic,

When a dashcam detects a sudden acceleration or impact, it saves a "selective video" of the seconds before and after the event. These clips are often appended into a single .bin archive. The "fg" prefix indicates that the camera processes the video feed to isolate the foreground (cars, pedestrians) from the background (sky, road, buildings) for smarter compression.

Some manufacturers (e.g., Unifi Protect, Wyze, Dahua) provide SDKs or command-line tools to convert .bin files. Search for the exact device model plus "video converter" or "firmware extractor".

The trend is shifting toward standards like MP4 using faststart flags or fragmented MP4 (fMP4) for dashcam/live recording. However, the extreme frugality of fg-selective-videos-lossy.bin—selective foreground encoding + lossy compression + raw binary packing—ensures it will remain in use for low-end IoT and legacy embedded systems for years to come.

Manufacturers like it because it: