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在自适应比特率流中使用多分辨率视频有什么好处？

[英]What are the benefits of using multi resolution videos in adaptive bitrate streaming?

原文 2017-12-22 02:33:33 1 1 video/ video-streaming/ streaming/ transcoding/ adaptive-bitrate

Why is it recommended to transcode videos with high resolution for high bitrate and low resolution for low bitrate? 为什么建议对高分辨率的视频进行高码率转码，而对低分辨率的视频进行低码率转码？ Why we should not use high video resolution for both high and low bitrates? 为什么我们不应该对高和低比特率都使用高视频分辨率？

1 个解决方案

Your choice is going to be if you want the video to sometimes buffer (if the bandwidth is not sufficient to deliver frames in real-time), or if you want the video to continue to play smoothly (sometimes at the expense of quality). 您将选择是否希望视频有时进行缓冲（如果带宽不足以实时传输帧），或者希望视频继续平稳播放（有时会牺牲质量）。 In some scenarios quality will be more important (and the user will happily wait to buffer to allow smooth playback), other times uninterrupted viewing no matter the bandwidth available is more important. 在某些情况下，质量将更为重要（用户将乐于等待缓冲以允许流畅播放），而在其他情况下，无论可用带宽如何，观看都不会中断。

Depending on the source material there are different optimization strategies and tuning that you can apply (multiple passes, variable vs fixed bitrates, codec selection etc) but the limitation of the end users available bandwidth is always going to be a constraint 取决于源材料，可以应用不同的优化策略和调整（多次通过，可变比特率与固定比特率，编解码器选择等），但是最终用户可用带宽的限制始终是一个约束。