The (14) suggests this is the 15th file in a series where you (or a program) saved multiple clips using the same base name.
Use a tool like HandBrake to re-encode the file. This "bakes" the frames into a more stable format. amf (14).mp4
Some recording tools default to the encoder name if a title isn't provided. The (14) suggests this is the 15th file
It is the primary way AMD users record gameplay or stream to platforms like Twitch and YouTube. amf (14).mp4
YouTube gives much higher bitrates to 1440p videos than 1080p ones. Even if you play at 1080p, upscaling your recording can result in a clearer upload.
It offloads the work from your CPU to your GPU, preventing your computer from slowing down during gaming or heavy tasks.