Redmoon Converters 在任意分辨率和帧率下，换算H.264、H.265、AV1和ProRes的视频比特率、文件大小和时长，并提供上传及存档的推荐比特率对照表。
| 编解码器 | 比特率（Mbps） | 文件大小 | 可容纳于 |
|---|
文件大小 = （视频比特率 + 音频比特率）× 时长 / 8，单位为字节。推荐比特率参考 YouTube 及广播行业针对 H.264/H.265/AV1 的指导标准；ProRes 采用苹果公司公布的数据速率表。60 fps 约按 1.5× 系数计算，120 fps 约按 2× 系数计算。
ProRes 是一种帧内编码的中间编解码器——文件体积远大于交付用编解码器，但非常适合用于剪辑。
File size = (video bitrate + audio bitrate) x duration / 8. The recommended bitrate itself is a lookup rather than a formula: each codec carries a table of Mbps per resolution. H.264 is 8 Mbps at 1080p and 45 at 4K UHD, H.265 is 5 and 25, AV1 is 4 and 20, ProRes 422 is 147 and 492. Frame rate then applies a multiplier, 1.0 up to 30 fps, 1.5 at 60 fps and 2.0 at 120 fps.
Resolution and codec move the number furthest. Duration accepts mm:ss, hh:mm:ss or plain seconds and starts at 10:00; Resolution spans 480p to 8K UHD with 1080p selected; Codec defaults to H.264 (AVC). Audio bitrate defaults to 192 kbps and is added to the video rate before the size is worked out, which is why the headline Mbps and the total underneath differ. All five codecs appear in the table simultaneously for comparison.
These are published-guideline starting points, not encoder output. Real file size depends on how much motion and fine detail a shot contains, whether you encode at constant or variable bitrate, and which preset and quality target you choose, so a static talking head at 1080p H.265 will land well under 5 Mbps. The ProRes rows are fixed data rates and therefore dependable; the H.264, H.265 and AV1 rows are estimates that any two-pass encode will beat or miss.
The tool applies a 1.5x frame-rate multiplier above 30 fps, so H.264 rises from 8 to 12 Mbps at 1080p60, H.265 from 5 to 7.5 Mbps and AV1 from 4 to 6 Mbps. At 120 fps the multiplier becomes 2.0 instead.
In the built-in table H.265 sits at roughly 60% of the H.264 rate and AV1 at about half. At 4K UHD that reads 45 Mbps for H.264, 25 Mbps for H.265 and 20 Mbps for AV1, for a comparable picture.
ProRes is an intra-frame editing codec: every frame is compressed independently, with no reference to neighbouring frames. At 1080p the tool lists ProRes 422 at 147 Mbps and ProRes 4444 at 220 Mbps, against 8 Mbps for H.264 delivery.
Yes. The audio figure in kbps is divided by 1,000 and added to the video bitrate before duration is applied. The big number shows video only, while the line beneath it reports the combined video-plus-audio rate actually used for the size.
Type 2:00:00, or 120:00 for minutes and seconds, or 7200 for raw seconds. The duration parser handles all three: two colons are read as hours, minutes and seconds, one colon as minutes and seconds, and a bare number as seconds.
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