问题描述
以下是我尝试访问的属性：
我查看了 mediainfo.js (https://github.com/buzz/mediainfo.js?files=1)，老实说我无法弄清楚。
我还看到有人提到可以使用“媒体信息”(https://mediaarea.net/en/MediaInfo) CLI 来完成此操作，但我找不到有关如何完成此操作的任何说明。
我也试过像这样使用 wmic：
var exec = require('child_process').exec
exec('wmic datafile where name="C:\\\\some_path\\\\MyTestCourse\\\\test_conversion\\\\testProject001\\\\videos\\\\video0.webm" get NaturalVideoWidth ',function(err,stdout,stderr){
if(!err){
console.log(stdout)
};
});
但我认为它无法访问我正在寻找的内容。
我需要能够在终端中运行它，作为我正在做的视频批量转换的一部分。我正在使用 nodejs 和批处理文件来完成此操作。
非常感谢您提供任何见解或建议。
解决方法
这是一个在 Node.js 中运行的（在我的机器上运行™️）脚本。希望能帮助到你。我使用来自 https://www.webmfiles.org/demo-files/
的测试视频const { promises } = require("fs");
const MediaInfoFactory = require("mediainfo.js");
function getReadChunkFunction(fileHandle) {
async function readChunk(size,offset) {
const buffer = new Uint8Array(size);
await fileHandle.read(buffer,size,offset);
return buffer;
}
return readChunk;
}
async function readMetaData(filepath) {
const mediaInfo = await MediaInfoFactory({ format: "JSON",coverData: true });
const fileHandle = await promises.open(filepath,"r");
const fileSize = (await fileHandle.stat()).size;
const readChunk = getReadChunkFunction(fileHandle);
const result = await mediaInfo.analyzeData(() => fileSize,readChunk);
return result;
}
// Usage example:
readMetaData(__dirname + "/big-buck-bunny_trailer.webm").then((result) => {
const data = JSON.parse(result);
const videoMetaData = data.media.track.find((item) => item["@type"] === "Video");
const { Width,Height } = videoMetaData;
console.log("Width",Width);
console.log("Height",Height);
});
mediainfo 的原始输出如下所示，展开代码段进行检查。
{
"media": {
"@ref": "","track": [
{
"@type": "General","UniqueID": "94077224337973666327274415816295077565","VideoCount": "1","AudioCount": "1","Format": "WebM","Format_Version": "1","FileSize": "2165175","Duration": "32.480","OverallBitRate_Mode": "VBR","OverallBitRate": "533294","FrameRate": "25.000","FrameCount": "812","StreamSize": "121714","IsStreamable": "Yes","Encoded_Date": "UTC 2010-05-20 08:21:12","Encoded_Application": "Sorenson Squeeze","Encoded_Library": "http://sourceforge.net/projects/yamka"
},{
"@type": "Video","StreamOrder": "0","ID": "1","UniqueID": "38308775201223106","Format": "VP8","CodecID": "V_VP8","BitRate": "439316","Width": "640","Height": "360","PixelAspectRatio": "1.000","DisplayAspectRatio": "1.778","FrameRate_Mode": "CFR","Compression_Mode": "Lossy","Delay": "0.000","StreamSize": "1783621","Language": "en","Default": "Yes","Forced": "No"
},{
"@type": "Audio","StreamOrder": "1","ID": "2","UniqueID": "110618262945856186","Format": "Vorbis","Format_Settings_Floor": "1","CodecID": "A_VORBIS","BitRate_Mode": "VBR","BitRate": "64000","Channels": "1","SamplingRate": "44100","SamplingCount": "1432368","Delay_Source": "Container","StreamSize": "259840","StreamSize_Proportion": "0.12001","Encoded_Library": "Xiph.Org libVorbis I 20100325 (Everywhere)","Encoded_Library_Name": "libVorbis","Encoded_Library_Version": "(Everywhere)","Encoded_Library_Date": "20100325 (Everywhere)","Forced": "No"
}
]
}
}