视频体积估算
UpBox优盒工具箱，免费在线视频体积估算：填时长、分辨率、帧率和码率，立刻算出文件大概多大，还能反推限制体积内该用多少码率，导出前先心里有数。
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视频参数Video settings
已估算
按「码率 × 时长 ÷ 8」估算，只算视频轨与音频轨，不含容器开销、索引与封装损失，实际文件通常会大 1-3%；推荐码率按 H.264 常规档位给出，H.265 可再降三成；目标体积一栏填 0 就不要这一项
本工具所有运算在本地浏览器完成，你的文件、文本不会上传到服务器
工具介绍
导出前最难判断的是「这个码率会得到多大文件」；等到渲染完才发现超了平台上限，只能重来一遍。 Before exporting, the hard question is how large a given bitrate will make the file; discovering after the render that it exceeds a platform limit means doing it again.
填好时长和码率先看估算，再填一个上限体积反推可用码率，两头夹一下，一次就能定下参数。 Enter the duration and bitrate to see the estimate, then add a size limit to get the bitrate that fits — bracketing it from both sides settles the settings in one pass.
- 双向估算Both directions
- 每分钟体积Per-minute size
- 分辨率建议码率Per-resolution suggestion
- 目标体积反推Backwards from target
使用说明
- 填时长与码率。Fill duration and bitrate.
- 看估算体积。Read the estimated size.
- 填目标体积反推码率。Add a target size to get the bitrate.
- 对照推荐档位定参数。Compare with the suggestion to settle it.
常见问题
算出来的为什么和实际文件差一点？Why does the real file differ a little?
只算了音视频轨的码率总量，容器索引、封装开销、可变码率的峰值都会让实际文件略大，通常在 1-3%。Only the audio and video track bitrates are counted; container index, muxing overhead and VBR peaks make the real file slightly larger, usually 1-3%.
码率填平均值还是峰值？Average or peak bitrate?
填编码器的平均码率（多数软件显示的就是它）；填峰值会明显高估体积。Enter the encoder average, which most tools report; a peak value will overestimate noticeably.
推荐码率是怎么来的？Where do the suggested bitrates come from?
按 H.264 在 24-30fps 下的常见档位，60fps 按 1.3-1.6 倍放大；H.265 同画质大约能省三成。Common H.264 levels at 24-30 fps, scaled 1.3-1.6 times at 60 fps; H.265 saves roughly 30% at the same quality.
反推出的码率低于 0 怎么办？What if the reversed bitrate goes below zero?
说明目标体积比音频轨本身还小，页面会直接提示，这时要降低音频码率或缩短时长。It means the target is smaller than the audio track alone, which the page flags; lower the audio bitrate or shorten the clip.