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• Play ogg file using ffplay / ffmpeg on .NET

  12 juillet 2021, par Rchrd

  I'm trying to play an Ogg file in VB.NET using ffplay.exe but I don't know exactly how.
This is my code :

  


  Private Sub ButtonIR_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonIR.Click
    If IsNotNothing(TextBoxSource.text) Then
        TextBoxDETALLES.Clear()
        Try
            Dim CONVERSOR As New Process

            CONVERSOR.StartInfo.FileName = "C:\ffplay.exe"
            CONVERSOR.StartInfo.Arguments = TextBoxSource.Text 
            CONVERSOR.StartInfo.UseShellExecute = False 
            CONVERSOR.StartInfo.RedirectStandardOutput = True 
            CONVERSOR.StartInfo.RedirectStandardError = True 
            CONVERSOR.StartInfo.CreateNoWindow = True 

            CONVERSOR.Start() 

            While Not CONVERSOR.StandardError.EndOfStream
                TextBoxDETALLES.AppendText(CONVERSOR.StandardError.ReadLine & vbCrLf) 

                Application.DoEvents()
            End While

            MsgBox("HECHO") 
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
    Else
        MsgBox("Error")
    End If
End Sub


  


  I'm not trying to convert it, I'm trying to play it.

  


• Why does my linux ffmpeg output file require running it back through ffmpeg to play on windows

  13 septembre 2020, par Sean Miller

  I am using the following to screen capture a Raspberry Pi display :

  


  /usr/bin/ffmpeg -v quiet -f lavfi -i anullsrc -f x11grab -framerate 30 -video_size 720x480 -i :0.0 -f flv -b:v 1M /home/pi/usbdrv/myfile.avi"


  


  I stop screen capturing by hitting the letter q and ffmpeg exits without error.

  


  I can play it back with mplayer in Linux.

  


  However, when I try to play it back on Windows with the old media player or its newer movie player, they reports it is corrupted. I tried mp4 and mkv fromats as well.

  


  If I run it back through ffmpeg to encode it to a new file, it will play.

  


  Any thoughts why Windows will not play it without running it back through ffmpeg again ?

  


  Thanks,
Sean

  


• Executing shell script on Google Cloud Functions

  9 juillet 2020, par João Abrantes

  I am trying to encode .mp4 videos into hls using FFmpeg.

  


  I am using subprocess to call FFmpeg :

  


  def transcoder(data, context):
    """Background Cloud Function to be triggered by Cloud Storage.
       This generic function logs relevant data when a file is changed.

    Args:
        data (dict): The Cloud Functions event payload.
        context (google.cloud.functions.Context): Metadata of triggering event.
    Returns:
        None; the output is written to Stackdriver Logging
    """
    try:
        input_filename = data['name'].split('/')[-1] #videos have no extension
        input_path = f'/tmp/{input_filename}'
        print(f'filename {input_filename}')
        print(f'input_path {input_path}')
        print(f"bucket {data['bucket']}")
        print(f"name {data['name']}")

        outdir_path = f'/tmp/output/{input_filename}'
        os.makedirs(outdir_path, exist_ok=True)

        bucket = client.get_bucket(data['bucket'])
        blob = bucket.get_blob(data['name'])
        blob.download_to_filename(input_path)

        cmd = f'''ffmpeg -y -i {input_path} \
              -preset ultrafast -g 60 -sc_threshold 0 \
              -map 0:0 -map 0:1 -map 0:0 -map 0:1 \
              -s:v:0 360x640 -c:v:0 libx264 -b:v:0 365k \
              -s:v:1 720x1280 -c:v:1 libx264 -b:v:1 3000k \
              -c:a copy \
              -var_stream_map "v:0,a:0 v:1,a:1" \
              -master_pl_name master.m3u8 \
              -f hls -hls_time 6 -hls_list_size 0 \
              -hls_segment_filename "{outdir_path}/%v_fileSequence%d.ts" \
              -hls_playlist_type vod \
               {outdir_path}/%v_prog_index.m3u8'''

        process = subprocess.Popen(cmd)
        stdout, stderr = process.communicate()
        upload_local_directory_to_gcs(outdir_path, upload_bucket, input_filename)
    except Exception as e:
        print(e)


  


  The problem is that I get an error :

  


  [Errno 2] No such file or directory: 'ffmpeg -y -i /tmp/video -preset ultrafast -g 60 -sc_threshold 0 -map 0:0 -map 0:1 -map 0:0 -map 0:1 -s:v:0 360x640 -c:v:0 libx264 -b:v:0 365k -s:v:1 720x1280 -c:v:1 libx264 -b:v:1 3000k -c:a copy -var_stream_map "v:0,a:0 v:1,a:1" -master_pl_name master.m3u8 -f hls -hls_time 6 -hls_list_size 0 -hls_segment_filename "/tmp/output/video/%v_fileSequence%d.ts" -hls_playlist_type vod /tmp/output/video/%v_prog_index.m3u8': 'ffmpeg -y -i /tmp/video -preset ultrafast -g 60 -sc_threshold 0 -map 0:0 -map 0:1 -map 0:0 -map 0:1 -s:v:0 360x640 -c:v:0 libx264 -b:v:0 365k -s:v:1 720x1280 -c:v:1 libx264 -b:v:1 3000k -c:a copy -var_stream_map "v:0,a:0 v:1,a:1" -master_pl_name master.m3u8 -f hls -hls_time 6 -hls_list_size 0 -hls_segment_filename "/tmp/output/video/%v_fileSequence%d.ts" -hls_playlist_type vod /tmp/output/video/%v_prog_index.m3u8'


  


  But I know that the input files and the output files do exist because I debugged that using print(os.listdir(path)) so now I am wondering if the FFmpeg I call with subprocess has access to the /tmp folder..?

  


  I know that there is a Python FFmpeg library I could use, but I don't know how to run my FFmpeg command using that library. Can you help ?

  


  p.s. I can run this locally with success.