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• (Go) FFmpeg stdout produces a jumbled mess of plain text mixed with binary [closed]

  30 juillet 2024, par EricFrancis12

  I'm trying to pipe r.Body into ffmpeg as it's stdin, then pipe stdout as the http response.

  


  On the client, I am sending the data via POST from an html form, then creating a blob for the response and prompting the browser to download it :

  


  <code class="echappe-js">&lt;script&gt;&amp;#xA;        document.getElementById(&amp;#x27;uploadForm&amp;#x27;).addEventListener(&amp;#x27;submit&amp;#x27;, function (event) {&amp;#xA;            event.preventDefault();&amp;#xA;&amp;#xA;            const fileInput = document.getElementById(&amp;#x27;file&amp;#x27;);&amp;#xA;            const file = fileInput.files[0];&amp;#xA;&amp;#xA;            const formData = new FormData();&amp;#xA;            formData.append(&amp;#x27;file&amp;#x27;, file);&amp;#xA;&amp;#xA;            fetch(&amp;#x27;/http&amp;#x27;, {&amp;#xA;                method: &amp;#x27;POST&amp;#x27;,&amp;#xA;                body: file,&amp;#xA;                headers: {&amp;#xA;                    &amp;#x27;Content-Type&amp;#x27;: file.type,&amp;#xA;                }&amp;#xA;            })&amp;#xA;                .then(response =&gt; {&amp;#xA;                    const blob = response.blob();&amp;#xA;                    const url = window.URL.createObjectURL(blob);&amp;#xA;                    const a = document.createElement(&amp;#x27;a&amp;#x27;);&amp;#xA;                    a.style.display = &amp;#x27;none&amp;#x27;;&amp;#xA;                    a.href = url;&amp;#xA;                    a.download = &amp;#x27;output.flv&amp;#x27;;&amp;#xA;                    document.body.appendChild(a);&amp;#xA;                    a.click();&amp;#xA;                    window.URL.revokeObjectURL(url);&amp;#xA;                })&amp;#xA;                .catch(error =&gt; console.error(error));&amp;#xA;        });&amp;#xA;    &lt;/script&gt;&#xA;

  


  On the server, I am creating an *exec.Cmd, assigning r.Body to it's stdin, and assigning w to both it's stdout and stderr :

  


  func handleHTTP(w http.ResponseWriter, r *http.Request) {
    command := "ffmpeg -f mp4 -i - -vf scale=100:50 -c:a copy -c:v libx264 -f flv pipe:1"
    ffmpegCmd := PrepareCommand(command, r.Body, w, w)

    // Run FFmpeg command
    if err := ffmpegCmd.Run(); err != nil {
        http.Error(w, fmt.Sprintf("FFmpeg command failed: %v", err), http.StatusInternalServerError)
    }
}

func PrepareCommand(command string, stdin io.ReadCloser, stdout io.Writer, stderr io.Writer) *exec.Cmd {
    command = strings.TrimSpace(command)
    name, args := FormatCommand(command)
    ffmpegCmd := exec.Command(name, args...)
    ffmpegCmd.Stdin = stdin
    ffmpegCmd.Stdout = stdout
    ffmpegCmd.Stderr = stderr
    return ffmpegCmd
}

func FormatCommand(str string) (name string, args []string) {
    parts := strings.Split(str, " ")
    return parts[0], parts[1:]
}


  


  When viewed in a text editor, the output file consists of the plain text emitted from stdout when the command starts and the binary data mixed together :

  


  



  


  Does anyone know how to get rid of the plain text output before piping the data into stdin ? Thanks.

  


  The output file should not contain plain text from the command start-up.

  


• FFMPEG script to cut audio at exact time intervals [duplicate]

  15 janvier 2021, par BitBit

  I have an audio file which is about 1 hour 10 minutes long, and I want to cut the audio into several parts which are exactly time 15 mins apart. Can someone please help me with a ffmpeg script that cuts audio at every 15th minute(i.e. at 15:00,30:00,45:00,60:00) and hence make my 1 hour 10 minutes audio clip into 5 cut clips of 15 minutes length(the last clip being only 10 minutes due to the video length)

  


• Remove Black Frames from an overlayed Circled Video

  7 juillet 2017, par amanguel

  I have a video that I need to overlay on top of another video. The first video have parts with black frames that I don’t want to be overlayed and I also need to mask this video with a circle.

  In other words, I will be overlaying a few circled videos on top of a bigger rectangular video and I also don’t want to show black frames from the circled videos.

  Could you please help me.

  Thanks !!!!!