如何将帧写入视频文件? [英] How to write frames to a video file?
问题描述
我需要在unix,C或C ++中完成。有没有可以提供一些说明?
谢谢。
编辑:
对不起,我没有写清楚。我想要一些开发人员API将帧写入视频文件。我打开相机流,我得到每一帧,然后我将它们保存在一个视频文件中,这些API可以在ffmpeg的公共apis中使用。所以使用命令行工具实际上并没有帮助我。我在ffmpeg src文件夹下看到了output_example.c。这是非常好的,我可以直接复制代码的一些部分,而不改变。我还在寻找一种更简单的方法。
此外,我正在考虑将我的应用移植到iPhone,据我所知,只有ffmpeg已经移植到iPhone上。 GStreamer基于glib,它都是GNU的东西。我不知道我是否可以在iPhone上工作。所以ffmpeg现在还是最好的选择。
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这可能有助于您开始 - 文档可用,但更新的功能往往在ffmpeg的手册页中记录。 / p>
框架需要按顺序编号。
ffmpeg -f image2 -r 25 -i frame_%d.jpg -vcodec libx264 -vpre hq -crf 22 video.mp4
-
-f
定义格式 -
-r
定义帧速率 -
-i
定义输入文件/ s ...%d
指定编号文件..添加0的
指定填充 -
-vcodec
选择视频编解码器 -
-vpre
指定使用一个名为hq的预设 -
-crf
指定一个速率控制方法,用于定义x264流如何
编码 -
video.mp4
是输出文件
I am currently writing an application that read frames from camera, modify them, and save them into a video file. I'm planing to do it with ffmpeg. There's rarely a documentation about ffmpeg. I can't find a way. Does any know how to do it?
I need it to be done on unix, and in C or C++. Does any can provide some instructions?
Thanks.
EDIT:
Sorry, I haven't write clearly. I want some developer APIs to write frames to a video file. I open up camera stream, I get every single frame, then I save them into a video file with those APIs available in ffmpeg's public apis. So using command line tool actually doesn't help me. And I've seen output_example.c under the ffmpeg src folder. It's pretty great that I may copy some parts of the code directly without change. And I am still looking for a easier way.
Also, I'm thinking of porting my app to iPhone, as far as I know, only ffmpeg has been ported on iPhone. GStreamer is based on glib, and it's all GNU stuff. I'm not sure if I can get it work on iPhone. So ffmpeg is still the best choice for now.
Any comments is appreciated.
This might help get you started - the documentation is available, but newer features tend to be documented in ffmpeg's man pages.
The frames need to be numbered sequentially.
ffmpeg -f image2 -r 25 -i frame_%d.jpg -vcodec libx264 -vpre hq -crf 22 video.mp4
-f
defines the format-r
defines the frame rate-i
defines the input file/s ...%d
specifies numbered files .. add 0's to specify padding-vcodec
selects the video codec-vpre
specifies use of a preset called hq-crf
specifies a rate control method, used to define how the x264 stream is encodedvideo.mp4
is the output file
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