: The suffix _source suggests this is the original, high-quality version of a clip before it has been compressed or transcoded for specific web resolutions (like 720p or 1080p).
: You can open it using standard players like Windows Media Player or QuickTime . If it fails to play due to codec issues, the VLC media player is a reliable cross-platform alternative that supports most MP4 encoding types. 0gmezgmey3urzv2jdgilq_source.mp4
While there is no public record of a specific "long piece" associated with this exact string, File Characteristics : The suffix _source suggests this is the