H.264 - 视频比特率和质量之间的关系
我的任务是将未压缩的电影转换为 H.264 格式。原片占用80G。我希望在不损失太多质量的情况下将其降低到 10G。
大多数 H.264/AVC 格式的 2 小时长 BD 电影似乎以 24 MBPS 比特率（视频）运行，并占用大约 20G 到 30G 磁盘空间。
我想知道比特率和视频质量之间是否成线性比例关系。换句话说，如果我将码率降低一半，视频质量会下降50%吗？
是否有一个公式可以计算动作片的适当比特率，同时将质量保持在原始视频的 80% 左右？
I have been given the task to convert an uncompressed movie to H.264 format. The original movie takes up 80G. I am hoping to bring it down to 10G without losing much in quality.
It appears most 2-hour long BD movies that are in H.264/AVC format run at 24 MBPS bitrate (video) and take up about 20G to 30G disk space.
I am wondering if the relationship between the bitrate and the video quality is linearly proportional. In other words, if I reduce the bitrate to half, will the video quality go down by 50%?
Is there a formula to calculate appropriate bitrate for an action movie while keeping the quality to about 80% of the original?
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实际情况比这复杂得多。质量不仅是主观的，而且特定的编码选项对质量的影响与比特率无关。保持编码参数不变，您可以将比特率与 SSIM（质量的近似度量）进行比较，但结果不太可预测。看看这里的图表： http://goldfishforthought.blogspot.com /2009/05/hd-video-standard.html
不幸的是，我认为确定项目最佳比特率的唯一方法是反复试验。
希望这有帮助！
It's a lot more complicated than that. Not only is quality is subjective, but the particular encoding options have an effect on quality that isn't related to bitrate. Holding encoding parameters constant, you can compare bitrate to SSIM (an approximate measure of quality) but the result is not very predictable. Have a look at the graph here: http://goldfishforthought.blogspot.com/2009/05/hd-video-standard.html
Unfortunately, I think the only way for you to determine the best bitrate for your project is trial-and-error.
Hope this helps!