Professional encoders call this the cliff edge . You can shrink an H.265 file from 10 GB to 2 GB with barely visible loss. But to go from 2 GB to 1 GB? That’s where you lose an entire generation of quality.
Using a different encoder, such as H.264 or VP9, can also help reduce file size. However, this method may require converting the video file to a different format. shrinking h265
High-efficiency doesn’t always mean small. Several factors contribute to oversized H.265 files: Professional encoders call this the cliff edge
If your source video is grainy (like an old movie or high-ISO footage), use a light filter. By smoothing out the "noise" that the encoder would otherwise struggle to map, you can drastically reduce the bitrate required to maintain a clean image. Hardware vs. Software Encoding That’s where you lose an entire generation of quality
Here are some methods to shrink H.265 files: