FFMPEG 实现混音，加水印，加文字，模糊水印任意滤镜组合

一共15种组合一下搞定；先伪代码没逻辑错误，然后就撸正式代码，后面测试就有点小顺利了

伪代码：

根据参数构造ffmpeg参数命令
构造元素视频方面有水印，文字，去水印；音频方面有混音一个
构造顺序： 先音频后视频 1：音频 2：水印 3：文字 4：去水印
伪代码
audioExist = false
videoExist = false
var filterPara string
var tailPara string
cmd += ffmpeg -loglevel verbose -i a.mp4
if(音频||水印||文字||去水印)
    filterPara += -filter_complex 
if(音频)
    cmd += -i b.mp3
    filterPara += "[0:a][1:a]amix=inputs=2:duration=shortest:dropout_transition=2[a]"
    tailPara += '-map 0:v:0 -map "[a]"'
    audioExist = true
if(水印)
    cmd += -i c.jpg
    if(audioExist)
        filterPara += ;[2:v]scale=94:167[vv];[0:v][vv]overlay=102:102
    else
        filterPara += [1:v]scale=94:167[vv];[0:v][vv]overlay=102:102
    videoExist = true
if(文字)
    if(!audioExist&&!videoExist)
        filterPara += ""
    else if(videoExist)
        filterPara += ","
    else 
        filterPara += ";"
    filterPara += ...
    videoExist = true
if(去水印)
    if(!audioExist&&!videoExist)
        filterPara += ""
    else if(videoExist)
        filterPara += ","
    else 
        filterPara += ";"
    filterPara += ...
tailPara += -f mp4 -movflags faststart fileName.mp4 -y

cmd += filterPara + tailPara

implemented with golang

func (modify *ModifyVideo) CombineCmd(taskid, mp4Url, audioUrl, outputFile string,
	imageLayer Imagelayers, delogo DelogoBody, txtLayer []Txtlayers) (ffmpegCmd, outputDir string) {

	if "" == mp4Url {
		return
	}

	_, err := os.Stat(logDir)

	if err == nil {
		fmt.Printf("mkdir logDir success\n")
	}

	if err != nil && os.IsNotExist(err) {
		err = os.MkdirAll(logDir, 0777)

		if err == nil {
			utils.Log.Debug("mkdir logDir success")
		} else {
			utils.Log.Debug("mkdir logDir failed")
		}
	}

	audioExist := false
	videoExist := false
	var filterPara string
	var tailPara string

	ffmpegCmd += "ffmpeg -loglevel verbose -i \"" + mp4Url + "\" "
	if audioUrl != "" || imageLayer.Src != "" || len(txtLayer) != 0 || delogo.Height != "" {
		filterPara += " -filter_complex \""
	}
	if audioUrl != "" {
		ffmpegCmd += " -i \"" + audioUrl + "\" "

		filterPara += "[0:a][1:a]amix=inputs=2:duration=shortest:dropout_transition=2[a]"
		tailPara += " -map 0:v:0 -map \"[a]\" "
		audioExist = true
	}
	if imageLayer.Src != "" {
		ffmpegCmd += " -i  \"" + imageLayer.Src + "\" "
		filterPara += modify.combImageLayer(audioExist, imageLayer)
		log4plus.Debug("after imageLayer added: filter para is: %s", filterPara)
		videoExist = true
	}
	if len(txtLayer) != 0 {
		if !audioExist && !videoExist {
			filterPara += ""
		} else if videoExist {
			filterPara += ","
		} else {
			filterPara += ";"
		}
		filterPara += modify.combTxtLayer(txtLayer)
		log4plus.Debug("after txtLayer added: filter para is: %s", filterPara)
		videoExist = true
	}
	if delogo.Height != "" {
		if !audioExist && !videoExist {
			filterPara += ""
		} else if videoExist {
			filterPara += ","
		} else {
			filterPara += ";"
		}
		filterPara += modify.combDelogo(delogo)
		log4plus.Debug("after delogo added: filter para is: %s", filterPara)
		videoExist = true
	}

	//tail of filtergraph end with "
	filterPara += "\""

	//输出路径
	outputDir += "/modifyvideo/"
	curStamp := strconv.Itoa(int(time.Now().Unix()))
	outputDir += taskid + "/"
	outputDir += curStamp

	err = os.MkdirAll(outputFile+outputDir, 0777)

	if err == nil {
		fmt.Printf("makdir success\n")
	} else {
		fmt.Printf("makdir failed\n")
	}
	outputDir += "/"

	fileName, isValid := getFileName(mp4Url, curStamp)
	log4plus.Debug("isvalid:%t, fileName:%s", isValid, fileName)

	if isValid {
		outputDir += fileName
	} else {
		outputDir += "out_" + curStamp + ".mp4"
	}

	outputFile += outputDir
	_, err1 := os.Create(outputFile)

	if err1 == nil {
		fmt.Printf("create file success\n")
	} else {
		fmt.Printf("create file failed\n")
	}

	tailPara += " -f mp4 -movflags faststart "
	tailPara += outputFile
	tailPara += " -y " //overwrite parameter
	ffmpegCmd += filterPara + tailPara
	log4plus.Debug("\ttailPara is %s\n\tffmpegCmd is %s", tailPara, ffmpegCmd)

	fflog := logDir + "/" + strconv.Itoa(logId) + "_" + strconv.Itoa(int(time.Now().Unix())) + ".log"

	logId++

	ffmpegCmd += " >" + fflog + " 2>&1"
	fmt.Println(ffmpegCmd)
	utils.Log.Debug("ffmpegCmd = " + ffmpegCmd)
	return
}

测试

4个滤镜全组合： 4+6+4+1 = 15种情况
四个全选
//音频+水印+文本+去水印 
curl -i -d '{"audiourl":"http://zxw-ybktest.chinacloudapp.cn/otvcloud_y1cc0ca0-f176-44d3-9d6c-d0634e71c5f6.mp3","cpid":"yz","mp4url":"http://183.131.106/lzy2214test.mp4","returl":"http://180.11.29.170:8880/backend-web/content/recReEditUrl.do","taskid":"1","imagelayers":{"height":"167","offsetX":"102","offsetY":"102","src":"http://13.131.159.21:1006/lzy/1522458959462-1522458959386_24_u=657178443,1345964771&fm=27&gp=0.jpg","width":"94"},"delogo":{"height":"20","offsetX":"10","offsetY":"10","width":"100"},"txtlayers":[{"fontColor":"#000000","fontSize":"14","offsetX":"305","offsetY":"277","text":"world"},{"fontColor":"#000000","fontSize":"14","offsetX":"100","offsetY":"100","text":"hello"}]}' http://183.11.19.27:8080/editvod