我的视频没有关键帧，怎么可能? [英] My video has no keyframes, How it is possible?

问题描述

当我在视频上运行以下行时，它仅输出P帧和B帧，而没有I帧，

When I run the following line on my video it only outputs P frames and B frames and no I frame,

ffprobe -select_streams v -show_frames -show_entries frame=pict_type -of csv 00000.MTS

视频怎么可能没有I帧.
此处是视频的链接.
根据本教程的定义，P帧仅基于先前的帧构建，如果存在没有其他框架可以建立在如何使用P框架上?
ffprobe -i 00000.MTS的输出是:

How is it possible for a video not to have I frames.
Here is the link to the video.
According to this tutorial's definition, P frames are just built upon previous frames, If there is no other frame to build upon how can we use P frames?
Output of ffprobe -i 00000.MTS is:

...
Input #0, mpegts, from '00000.MTS':
  Duration: 00:17:13.24, start: 1.040000, bitrate: 16451 kb/s
  Program 1 
    Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 256 kb/s
    Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090), 1920x1080

推荐答案

如 Wikipedia :

P帧可以包含内部宏块或预测的宏块

P-frames can contain either intra macroblocks or predicted macroblocks

因此您的视频可以在P帧中包含I帧宏块.

So your video can contain I-frame macroblocks in P-frames.

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