Linux下使用convert对图片缩放和使用ffmpeg对视频进行转换

鉴于工作需要，研究了一下Linux的convert命令和ffmpeg命令

一、使用convert命令实现图片缩放

工作需求：在用户上传图片和视频时进行异步处理，如果上传的是图片，生成一张中等比例的图片和一张小的缩略图。最终的结果，存储一张原图，一张中等比例的图片，一张缩略图。如果上传的是视频，需要将视频格式统一转化为mp4格式。

上传图片和视频使用的是百度的在线编辑器ueditor。对其上传类Uploader.class.php进行修改，具体操作如下

/**
* 上传文件的主处理方法
* @return mixed
*/
private function upFile() {
	$file = $this->file = $_FILES[$this->fileField];
	if (!$file) {
	    $this->stateInfo = $this->getStateInfo("ERROR_FILE_NOT_FOUND");
	    return;
	}
	if ($this->file['error']) {
		#error_log(json_encode($file), 3, "./logs/error.log");
		#error_log(json_encode($this->file), 3, "./logs/error.log");
	    $this->stateInfo = $this->getStateInfo($file['error']);
	    return;
	} else if (!file_exists($file['tmp_name'])) {
	    $this->stateInfo = $this->getStateInfo("ERROR_TMP_FILE_NOT_FOUND");
	    return;
	} else if (!is_uploaded_file($file['tmp_name'])) {
	    $this->stateInfo = $this->getStateInfo("ERROR_TMPFILE");
	    return;
	}

	$this->oriName = $file['name'];
	$this->fileSize = $file['size'];
	$this->fileType = $this->getFileExt();
	$this->fullName = $this->getFullName();
	$this->filePath = $this->getFilePath();
	$this->fileName = $this->getFileName();
	$dirname = dirname($this->filePath);

	//检查文件大小是否超出限制
	if (!$this->checkSize("upFile")) {
	    $this->stateInfo = $this->getStateInfo("ERROR_SIZE_EXCEED");
	    return;
	}

	//检查是否不允许的文件格式
	if (!$this->checkType()) {
	    $this->stateInfo = $this->getStateInfo("ERROR_TYPE_NOT_ALLOWED");
	    return;
	}

	//创建目录失败
	if (!file_exists($dirname) && !mkdir($dirname, 0777, true)) {
	    $this->stateInfo = $this->getStateInfo("ERROR_CREATE_DIR");
	    return;
	} else if (!is_writeable($dirname)) {
	    $this->stateInfo = $this->getStateInfo("ERROR_DIR_NOT_WRITEABLE");
	    return;
	}

	//移动文件
	//if (!(move_uploaded_file($file["tmp_name"], $this->filePath) && file_exists($this->filePath))) { //移动失败
	$tmp_content = file_get_contents($file["tmp_name"]);
	$newfile = $this->_compress($tmp_content);
	if (!(file_put_contents($this->filePath, $newfile) && file_exists($this->filePath))) { //移动失败
	    $this->stateInfo = $this->getStateInfo("ERROR_FILE_MOVE");
	} else { //移动成功
	    //异步处理上传图片文件
	    if(in_array($this->fileType,array('.png','.jpg','.jpeg','.bmp'))){
		$getSize=getimagesize($this->filePath);
		$middleSize=$getSize[1] * (750 / $getSize[0]);
		$smallSize=$getSize[1] * (360 / $getSize[0]);
		$srcName=basename($this->fullName);
		$cmd = "sh ../shell/deal.sh $srcName $middleSize $smallSize >>logs/syn_upload.log  &";
		exec($cmd);
	    }//异步转换视频为mp4格式
            if(in_array($this->fileType,array('.mp4','.mov','.avi'))){
                $srcName=basename($this->fullName);
                $cmd = "sh ../shell/deal_video.sh $srcName >>logs/syn_upload_video.log  &";
                exec($cmd);
            }
	    $this->stateInfo = $this->stateMap['SUCCESS'];
	}
}

//deal.sh(处理图片的shell脚本)
#!/bin/bash
DATE=$(date +%Y%m%d);
newext='jpg';
for file in ../images/${DATE}/$1; do
 echo ${file};
 #name=$(ls $file | cut -d. -f1);
 ext=${file##*.};
 name=$(basename ${file} .${ext});
 #echo $name;exit;
 if [ $ext = 'png' ];then
    ext=${newext};
 fi
 to_middle_file="../images/$DATE/${name}_m.${ext}";
 to_small_file="../images/$DATE/${name}_s.${ext}";
 convert -resize 750x$2! -quality 80 ${file} ${to_middle_file};
 ls ${to_middle_file};
 convert -resize 360x$3! ${file} ${to_small_file};
 ls ${to_small_file};
done

//deal_video.sh(处理视频的shell脚本)

#!/bin/bash
DATE=$(date +%Y%m%d);
newext='mp4';
for file in ../video/${DATE}/$1; do
 #echo ${file};
 #name=$(ls $file | cut -d. -f1);
 ext=${file##*.};
 name=$(basename ${file} .${ext});
 #echo $name;
 if [ $ext != 'mp4' ];then
    ext=${newext};
    to_new_file="../video/$DATE/${name}.${ext}";
    #echo $to_new_file;exit;
    ffmpeg -i ${file} -vcodec copy -acodec copy ${to_new_file};
    ls ${to_new_file};
 fi
done