Target-size compression
Reverse-calculate video bitrate from target size and duration.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
Video filename
Target-size plan
Reverse-calculates video and audio bitrate.
Enter a video to calculate
Video kb/s: 0
What this tool does
- Control upload size
- Plan attachment videos
Example
Input
input.mp4
Output
按目标体积反推码率 ffmpeg -i input.mp4 -c:v libx264 -b:v 2602k -c:a aac -b:a 128k output.mp4 目标 20 MB，时长 60s 视频码率 2602 kb/s，音频码率 128 kb/s
Audio bitrate is deducted before calculating video bitrate.
Frequently asked questions
Is the target exact?
Container overhead can cause a small difference.
Is audio included?
Audio bitrate is deducted from the target.
Are small targets supported?
Yes, video bitrate is clamped to 1 kb/s.
Keywords：目标体积视频码率target sizecompressionffmpeg