2020-05-20 15:50:37 +00:00
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package main
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import (
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"bufio"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"math"
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"net/http"
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"os"
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"os/exec"
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"path"
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"strconv"
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"strings"
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)
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func main() {
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fmt.Println("BigBlueButton video creator/downloader")
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scanner := bufio.NewScanner(os.Stdin)
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fmt.Print("Enter URL of recording: ")
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scanner.Scan()
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presentationUrl := scanner.Text()
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result := strings.SplitAfter(presentationUrl, "?meetingId=")
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presentationId := result[1]
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fmt.Print("Name of recording: ")
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scanner.Scan()
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meetingName := scanner.Text()
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result2 := strings.Split(result[0], "/playback/")
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baseUrl := result2[0] + "/presentation/" + presentationId
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fmt.Println("baseUrl= ", baseUrl)
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//read duration of recording and meeting name from meta.xml
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metaUrl := baseUrl + "/metadata.xml"
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responseMeta, err := http.Get(metaUrl)
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if err != nil {
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log.Fatal(err)
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}
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defer func() {
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_ = responseMeta.Body.Close()
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}()
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metaBody, err := ioutil.ReadAll(responseMeta.Body)
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if err != nil {
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log.Fatal(err)
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}
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//finding correct duration-ending of last slide
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timeString := strings.SplitAfter(string(metaBody), "<duration>")
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duration := strings.Split(timeString[1], "</duration>")
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fmt.Println("duration of recording=", duration[0], "ms")
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shapesUrl := baseUrl + "/shapes.svg"
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webcamsWebmUrl := baseUrl + "/video/webcams.webm"
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webcamsMp4Url := baseUrl + "/video/webcams.mp4"
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deskshareWebmUrl := baseUrl + "/deskshare/deskshare.webm"
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deskshareMp4Url := baseUrl + "/deskshare/deskshare.mp4"
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//read content of the shapes.svg file, and assign shapes to it
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responseShapes, err := http.Get(shapesUrl)
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if err != nil {
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log.Fatal(err)
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}
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defer func() {
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_ = responseShapes.Body.Close()
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}()
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shapesBody, err := ioutil.ReadAll(responseShapes.Body)
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if err != nil {
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log.Fatal(err)
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}
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shapes := string(shapesBody)
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fmt.Println("creating directory: ", presentationId)
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if _, err := os.Stat(presentationId); os.IsNotExist(err) {
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err = os.Mkdir(presentationId, 0700)
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if err != nil {
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fmt.Println("Failed to create temporary folder:", err.Error())
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}
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}
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// Find and print slide timings, image Urls
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durations := make(map[int]float64)
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vidnames := make(map[int]string)
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imgnames := make(map[int]string)
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inValue, outValue, truncated := 0.0, 0.0, 0.0
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inSrc, outSrc, pngSrc := "0.0", "10.5", "presentation/"
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i := 1 // number of png pictures for slide
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//parse for in= out= href= from /shapes.svg
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ins := strings.Split(shapes, "in=\"")
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outs := strings.Split(shapes, "out=\"")
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pngs := strings.Split(shapes, "xlink:href=\"")
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for k := 1; k < len(ins); k++ {
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intext := strings.SplitAfter(ins[k], "\"")
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realin := strings.Split(intext[0], "\"")
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inSrc = realin[0]
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outtext := strings.SplitAfter(outs[k], "\"")
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realout := strings.Split(outtext[0], "\"")
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outSrc = realout[0]
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imgtext := strings.SplitAfter(pngs[k], "\"")
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realpng := strings.Split(imgtext[0], "\"")
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pngSrc = realpng[0]
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inValue, _ = strconv.ParseFloat(inSrc, 64)
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outValue, _ = strconv.ParseFloat(outSrc, 64)
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truncated = (outValue*10 - inValue*10) / 10
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durations[i] = truncated
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imgnames[i] = "s" + strconv.Itoa(i) + ".png"
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vidnames[i] = "v" + strconv.Itoa(i) + ".mp4"
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imgUrl := baseUrl + "/" + pngSrc
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if err := DownloadFile(path.Join(presentationId+"/"+imgnames[i]), imgUrl); err != nil {
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panic(err)
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}
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i++
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}
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//correct duration of last slide
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outValue, _ = strconv.ParseFloat(duration[0], 64)
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outValue = outValue / 1000
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outValue = math.Round(outValue*100) / 100
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fmt.Println("ending of presentation=", outValue)
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truncated = (outValue*10 - inValue*10) / 10
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durations[i-1] = math.Round(truncated*100) / 100
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fmt.Println("Duration of last slide according to meta.xml is: ", durations[i-1])
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// create mp4 files from png files
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fmt.Println("Creating videos from slide pictures, duration is given as seconds")
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for j := 1; j < i; j++ {
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fmt.Println(imgnames[j], " ", vidnames[j], " ", durations[j])
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cmd := exec.Command("ffmpeg",
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"-loop", "1",
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"-framerate", "1",
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"-i", path.Join(presentationId, imgnames[j]),
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"-t", fmt.Sprint(durations[j]),
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"-pix_fmt", "yuv420p",
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2020-05-25 08:11:12 +00:00
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"-vf", "scale=-1:1080",
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2020-05-20 15:50:37 +00:00
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path.Join(presentationId, vidnames[j]))
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err = cmd.Run()
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if err != nil {
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fmt.Println("Failed to create video from slide:", err.Error())
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return
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}
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}
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//create video_list.txt file to cancat with ffmpeg
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f, err := os.Create("video_list.txt")
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if err != nil {
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fmt.Println(err)
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return
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}
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for j := 1; j < i; j++ {
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_, err := f.WriteString("file " + path.Join(presentationId, vidnames[j]) + "\n")
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if err != nil {
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fmt.Println(err)
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_ = f.Close()
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return
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}
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}
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err = f.Close()
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if err != nil {
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fmt.Println(err)
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return
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}
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// concat slide videos to create one piece of video file: slides.mp4
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fmt.Println("merging slide videos to create: slides.mp4")
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cmd := exec.Command("ffmpeg",
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"-f", "concat",
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"-safe", "0",
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"-i", "video_list.txt",
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"-c", "copy",
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path.Join(presentationId, "slides.mp4"))
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err = cmd.Run()
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if err != nil {
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fmt.Println("Failed to merge slide videos:", err.Error())
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return
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}
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fmt.Println("slide videos merged")
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// download webcams
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2020-05-25 08:11:12 +00:00
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webcamsFile := ""
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2020-05-20 15:50:37 +00:00
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fmt.Println("downloading webcams")
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err = DownloadFile(path.Join(presentationId, "webcams.webm"), webcamsWebmUrl)
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if err != nil {
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2020-05-25 08:11:12 +00:00
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err = DownloadFile(path.Join(presentationId, "webcams.mp4"), webcamsMp4Url)
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2020-05-20 15:50:37 +00:00
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if err != nil {
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2020-05-25 08:11:12 +00:00
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fmt.Println("No webcams")
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} else {
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fmt.Println("webcams.mp4 file is downloaded")
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webcamsFile = path.Join(presentationId, "webcams.mp4")
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2020-05-20 15:50:37 +00:00
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}
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} else {
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fmt.Println("webcams.webm file is downloaded")
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2020-05-25 08:11:12 +00:00
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webcamsFile = path.Join(presentationId, "webcams.webm")
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2020-05-20 15:50:37 +00:00
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}
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// download deskshare
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2020-05-25 08:11:12 +00:00
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deskshareFile := ""
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2020-05-20 15:50:37 +00:00
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fmt.Println("downloading deskshare")
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err = DownloadFile(path.Join(presentationId, "deskshare.webm"), deskshareWebmUrl)
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if err != nil {
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2020-05-25 08:11:12 +00:00
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err = DownloadFile(path.Join(presentationId, "deskshare.mp4"), deskshareMp4Url)
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2020-05-20 15:50:37 +00:00
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if err != nil {
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fmt.Println("No deskshare")
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} else {
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2020-05-25 08:11:12 +00:00
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fmt.Println("deskshare.mp4 file is downloaded")
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deskshareFile = path.Join(presentationId, "deskshare.mp4")
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2020-05-20 15:50:37 +00:00
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}
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} else {
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fmt.Println("deskshare.webm file is downloaded")
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2020-05-25 08:11:12 +00:00
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deskshareFile = path.Join(presentationId, "deskshare.webm")
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2020-05-20 15:50:37 +00:00
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}
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fmt.Println("merging slides, webcams and deskshare side by side")
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2020-05-25 08:11:12 +00:00
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streams := 1
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cmd = exec.Command("ffmpeg", "-i", path.Join(presentationId, "slides.mp4"))
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if webcamsFile != "" {
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cmd.Args = append(cmd.Args, "-i")
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cmd.Args = append(cmd.Args, webcamsFile)
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streams++
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}
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if deskshareFile != "" {
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cmd.Args = append(cmd.Args, "-i")
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cmd.Args = append(cmd.Args, deskshareFile)
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streams++
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}
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cmd.Args = append(cmd.Args, "-c")
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cmd.Args = append(cmd.Args, "copy")
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for i := 0; i < streams; i++ {
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cmd.Args = append(cmd.Args, "-map")
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cmd.Args = append(cmd.Args, strconv.Itoa(i))
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2020-05-20 15:50:37 +00:00
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}
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2020-05-25 08:11:12 +00:00
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cmd.Args = append(cmd.Args, meetingName+".mkv")
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2020-05-20 15:50:37 +00:00
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err = cmd.Run()
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if err != nil {
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fmt.Println("Failed to merge slides and webcams:", err.Error())
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return
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}
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fmt.Println("Name of the final video is: ", meetingName)
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_ = os.RemoveAll(presentationId + "/")
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_ = os.Remove("video_list.txt")
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}
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// DownloadFile will download a url to a local file.
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func DownloadFile(filepath string, url string) error {
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// Get the data
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resp, err := http.Get(url)
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if err != nil {
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return err
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} else if resp.StatusCode != 200 {
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return errors.New("Response status code: " + strconv.Itoa(resp.StatusCode))
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}
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defer func() {
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_ = resp.Body.Close()
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}()
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// Create the file
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out, err := os.Create(filepath)
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if err != nil {
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return err
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}
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defer func() {
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_ = out.Close()
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}()
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// Write the body to file
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_, err = io.Copy(out, resp.Body)
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return err
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}
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