Since AJB files are rarely intentional, you want to prevent their creation.
If you consistently work with proprietary or fragmented video data, consider switching to more robust, open alternatives: ajb mp4
Unlike .mp4, which is a standardized container (ISO/IEC 14496-14), .ajb has no official standardization body. It is often a linear raw data dump – a sequence of bytes extracted from a video stream without the necessary header information (metadata). Without the header, your media player doesn't know the resolution, frame rate, or codec used. Since AJB files are rarely intentional, you want