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• Get stdout from an idle background application in Windows

  24 septembre 2016, par Joe

  I have an ffmpeg.exe process that appears to be hung - it hasn’t done anything for several days. It was started by exec() in PHP, so is running in the background and has no window.

  I would like to know what caused it to stop/hang.

  Is there anyway to get what it has written to stdout ?

• QML multimedia cannot play m3u8 that is generated with ffmpeg

  5 juin 2023, par LeXela-ED

  With the following command, I am trying to stream an IP camera over web :

  


  ffmpeg -re -i "rtsp://<user>:<password>@<ip>:<port>" -c:v copy -c:a copy -hls_segment_type mpegts -hls_list_size 5 -hls_wrap 5 -hls_time 2 -hls_flags split_by_time -segment_time_delta 1.00 -reset_timestamps 1 -hls_allow_cache 0 -movflags faststart live.m3u8```&#xA;</port></ip></password></user>

  


  This command, produces live.m3u8 and five ts files : live0.ts, live1.ts, live2.ts, live3.ts, and live4. And conversion goes smoothly. At some random point, the content of live.m3u8 is as follows :

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:92
#EXTINF:2.000000,
live2.ts
#EXTINF:2.000000,
live3.ts
#EXTINF:2.035800,
live4.ts
#EXTINF:2.000000,
live0.ts
#EXTINF:1.963278,
live1.ts


  


  However, when I tried to play live.m3u8 with the following QML code, it only played a very first segments of it :

  


  import QtQuick 2.15
import QtQuick.Window 2.15
import QtQuick.Controls 2.15
import QtQuick.Layouts 1.15
import QtMultimedia 5.15

Window
{
    width: 640
    height: 480
    visible: true

    Item
    {
        anchors.fill: parent

        MediaPlayer
        {
            id: mediaplayer
            source: "path-to-live/live.m3u8"
            videoOutput: videoOutput
        }

        VideoOutput
        {
            id: videoOutput
            anchors.fill: parent
        }

        MouseArea
        {
            anchors.fill: parent
            onPressed: mediaplayer.play();
        }
    }
}



  


  The interesting thing is : I manually deleted live.m3u8, and obviously, ffmpeg generated another one after ! Then I clicked on the QML program window, and surprisingly, it played the stream nonstop as it was expected at the first run !

  


  What is the problem here ? What I am missing ? Should I change the ffmpeg command or do something with my qml code ? Any idea or help ?

  


  Thank you in advance.

  


• Why does ffplay read both video and keyboard input from stdin ?

  27 janvier 2016, par cxrodgers

  I’m trying to compress a video feed from a webcam while simultaneously displaying it, using ffmpeg and ffplay. I do actually have this working, but I want to disable the ffplay window from interpreting keyboard presses.

  It took me a while to figure this out but here’s what I’m using :

  ffmpeg -f video4linux2 -i /dev/video0 -vcodec mpeg4 -f rawvideo - \
  
    | tee output.mkv \
  
    | ffplay -fflags nobuffer -

  (Actually I am doing all of this from a Python script using the subprocess module. Here I have represented it as a straightforward terminal command because the result is the same.)

  So this actually works and does everything I want. The only thing is that if the ffplay window is active, it interprets keypresses (like "F" for fullscreen). Instead I want it to completely ignore all keypresses.

  My questions :

  1. How is this even possible ? I thought I was redirecting video input to stdin, and then telling ffplay to read video from stdin. How can keypresses be multiplexed on the same pipe ?
  2. How can I disable this behavior ? I tried "-nostdin" but it doesn’t work with my version.

  # ffplay -nostdin output.mkv

  ffplay version N-77455-g4707497 Copyright
  (c) 2003-2015 the FFmpeg developers built with gcc 4.8 (Ubuntu
  4.8.4-2ubuntu1 14.04)

  ...

  Failed to set value ’output.mkv’ for option ’nostdin’ : Option not
  found