Video ToolsLesson 285Free preview
Video Compressor
This lesson is part of Web Developer Tools · All levels
Summary
Video compressors reduce file sizes to make uploading or sending easier. Size is affected by resolution, bitrate, codec, and duration; lowering one of these will reduce size but also quality. The tool usually provides a quality or size target that can be customized. For best results, compress once from the original file and compare the results before use.
Key points
- The size of a video file is primarily determined by bitrate, resolution, codec, and duration
- Reducing bitrate or resolution reduces file size but reduces detail
- CRF on x264/x265: higher value means smaller files and lower quality
- Repeated compression on compressed files worsened the quality
- Audio also takes up space; a bitrate of 96-128 kbps is often enough for sound
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