WebRTC视频约束不起作用

问题描述

我正在尝试从网络摄像头中获得较低的分辨率

I'm trying to get a lower resolution from the webcam

navigator.getUserMedia({audio: true,
    video: {
        "mandatory" : {maxWidth : 320},
        "optional" : []
    }
}, function(stream) {
    videoElement.src = URL.createObjectURL(stream);
}, function(error) {console.log(e)});

一切正常，但是videoElement.videoWidth仍然是640.无论我指定的视频限制是什么，这都是相同的.这仅在Firefox中发生，在Chrome中一切正常.

Everything works fine, but videoElement.videoWidth is still 640. This is the same whatever video constraints I specify. This is happening only in Firefox, in Chrome everything works fine.

有人知道为什么吗?

我也尝试指定maxFrameRate，但这也被忽略.我也尝试了不使用optional以及也使用maxHeight.

I also tried specifying maxFrameRate, but this is also ignored. I also tried without optional and with maxHeight too.

推荐答案

Firefox中有许多错误正在处理中，因为它不支持可编程的视频帧速率和分辨率更改.

There are numerous bugs that are being handled in Firefox for it not supporting programable video framerate and resolution changes.

• 允许在媒体限制条件下更改帧率
• 支持视频分辨率的运行时更改
• 在媒体限制条件下为视频分辨率提供纯数字

• Allowing the framerate to be changed in the media constraints
• Support runtime change of video resolution
• Support plain numbers for the video resolution in the media constraints

您应该可以通过以下方式设置约束:

You are supposedly able to set the constraints this way:

mediaConstraints = {
      "audio": true,
      "video": {
         width: {
             min: 320,
              max: 320
          },
          height: {
             min: 240,
              max: 240
          } }
    };

但是我一直无法获得视频分辨率限制，因此无法通过媒体限制使其在Firefox中正常工作.在firefox中更改about:config中的默认分辨率时，我获得的成功有限.

But I have never been able to get video resolution constraints to work it to work in Firefox through media constraints. I have had limited success with changing the default resolution in about:config in firefox.

这些问题是众所周知的，我相信许多人正在努力解决这些问题.

These issues are known and I believe that numerous people are working on them to get them resolved.

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