如何使用avconv / ffmpeg从流式RTMP连续提取视频帧？ [英] How to continuously extract video frames from streaming RTMP using avconv / ffmpeg?

问题描述

我们正在处理RTMP上的流式视频，我的目标是以给定的时间间隔从流中提取帧。每1秒。

We're dealing with streaming video on RTMP and my goal is to extract frames from the stream at a given interval, e.g. every 1 second.

目前我在一个循环中运行一个命令，它需要一个框架并将其作为base64 JPEG导出：

Currently I run a command in a loop, which takes a frame and exports it as base64 JPEG:

avconv -i <URL> -y -f image2 -ss 3 -vcodec mjpeg -vframes 1 -s sqcif /dev/stdout 2>/dev/null | base64 -w 0

但是，这些过程都很长（需要几秒钟 - 甚至增加了更多延迟流媒体视频已经不是实时的）。我想知道是否有办法使avconv或ffmpeg以间隔（以秒或帧）提取帧，并将其另存为文件或转储到stdout。

But each of these processes is long (takes a few seconds -- which adds even more delay on streaming video that's not real time already). I am wondering if there is a way to make avconv or ffmpeg to extract frames at an interval (in seconds or frames) and either save as a file or dump to stdout.

我真的很感谢你的帮助！

I would really appreciate your help!

推荐答案

你尝试过吗？

ffmpeg -i <URL> -r 1 out%03d.jpg

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