-b:v< target bitrate>的区别是什么?和-b<目标比特率>FFmpeg标志? [英] What the different between -b:v <target bitrate> and -b <target bitrate> FFmpeg flags?

问题描述

我需要限制视频比特率，哪个标记更适合使用?我重新编码h.264视频.

I need to bound the video bitrate, which flag is better to use? I re-encode h.264 video.

推荐答案

:v 是流说明符的示例，该说明符指示和限制流该选项所应用到的位置.因此， -option:a:2 仅适用于第三音频输出流，而 -option:a 将适用于所有音频输出流. -option 将适用于所有流.

:v after the b is an example of a stream specifier, which directs and limits the streams to which the option is applied. So, -option:a:2 would only apply to the third audio output stream, whereas -option:a would apply to all audio output streams. -option would apply to all streams.

但是，对于 -b ，ffmpeg将捕获此语法并将其与 -b:v 相同.

However, in the case of -b, ffmpeg will catch this syntax and treat it the same as -b:v.

另外，请参阅 https://superuser.com/a/1219824 ，以了解有关选项顺序如何影响结果的指南.

Also, see https://superuser.com/a/1219824 for guide to how the order of options affects result.

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