In software development, "547" often refers to a specific issue or bug report number. Two prominent examples include:
Is it a you need help describing or summarizing? SVO to MP4 (+ downsizing procedure question) #547 - GitHub
In academic publishing, video files are often numbered as supplemental materials:
There is documentation regarding Strain TMN547 (a Bacillus subtilis variant), which may have associated time-lapse video data in research papers. 3. Artistic & Performance Media