用FFMPEG编码某个MP4 GOP

问题描述

我有一个.y4m视频文件，我想使用FFmpeg将其转换为.mp4。问题是我想要一种类型的GOP，这一个： IBBPBBPBBPBB 。但是当我将GOP大小设置为12（ -g 12 ）是 IPPPPPPPPPPP 时，我得到了什么。我也尝试使用 -bf 8 选项，但我得到的结果，如IPBBB ...，视频播放不正确。

你能告诉我如何使用FFmpeg来获取确切的 IBBPBBPBBPBB GOP？

解决方案

我想你想要的是：

  -g 12 -bf 2 sgop 
  

-g 标志设置GOP大小（如您所述）， -bf 2 表示2 B-帧应插入每组P帧之间，而 sgop 严格执行GOP大小。

I have a .y4m video file, and I want to convert it to .mp4 using FFmpeg. The problem is that I want a certain kind of GOP, this one: IBBPBBPBBPBB. But what I get, when I set the GOP size to 12 (-g 12) is IPPPPPPPPPPP. I've also tried using the -bf 8 option, but I get results like IPBBB... and the video doesn't play right.

Could you please tell me how to get the exact IBBPBBPBBPBB GOP using FFmpeg?

Thanks for your help

解决方案

I think you want something to the effect of :

-g 12 -bf 2 sgop

The -g flag sets the GOP size (as you already mentioned), the -bf 2 says that 2 B-frames should be inserted between each set of P-frames, and the sgop strictly enforces the GOP size.

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