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• Extract different camera frames (multiplex)

  22 août 2016, par Mike Issa

  I have a sequential multiplexed video with 3 cameras. These videos are being converted from VHS to DVD (.VOB format). I am using ffmpeg to extract all frames in .JPG format.

  I want to write a python script that scans for a certain object in the frame (like a constant/static object in the background) and organizes all the frames containing that object into a folder. This is the only way I can think of to separate the camera views, because as the video progresses, one of the cameras turns off for a few minutes and then turns back on, ruining the interval of 3-frames-per-camera-view sequence*.

  • I tried writing a python script that extracts every third frame (starting from the first frame for camera 1, second frame for camera 2, third frame for camera 3) into separate folders, but this did not bode well when I found out that one of the cameras switches off and then back on.

  I tried a "detection patch" method using VirtualDub found in this forum, but it didn’t work for me (not sure why).

  Should I be using numpy or openCV to find a certain block of pixels in each frame to do the organizing of camera views, or is there a simpler way ?

• fftp server stream server error- connection to tcp:10.10.X.X timeout=0 faild no route to host

  1er juillet 2023, par slowmonk

  When attempting to stream the webcam using RTSP, I encountered persistent timeout issues.

  


  https://hub.docker.com/r/aler9/rtsp-simple-server

  


  docker run -p 6020:8000 aler9/rtsp-simple-server:latest
2023/07/01 20:15:24 INF MediaMTX v0.23.7
2023/07/01 20:15:24 INF [RTSP] listener opened on :8554 (TCP), :8000 (UDP/RTP), :8001 (UDP/RTCP)
2023/07/01 20:15:24 INF [RTMP] listener opened on :1935
2023/07/01 20:15:24 INF [HLS] listener opened on :8888
2023/07/01 20:15:24 INF [WebRTC] listener opened on :8889 (HTTP)

$ sudo ffmpeg -f v4l2 -framerate 24 -video_size 480x480 -i /dev/video0 -f rtsp -rtsp_transport tcp rtsp://192.168.XXX.XXX:8554/webCamStream


  


  following error occur

  


  ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
  configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
[video4linux2,v4l2 @ 0x5642e55137c0] The V4L2 driver changed the video from 480x480 to 640x480
[video4linux2,v4l2 @ 0x5642e55137c0] The driver changed the time per frame from 1/24 to 1/30
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 46142.014949, bitrate: 147456 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
[tcp @ 0x5642e55e34c0] Connection to tcp://10.10.1068:9988?timeout=0 failed: No route to host
Could not write header for output file #0 (incorrect codec parameters ?): No route to host
Error initializing output stream 0:0 --


  


• ffmgep stucks while merging two streams at input 0 [closed]

  3 février 2024, par Robi Tagore

  I tried to merge two streams downloaded before, I was using ffmpeg to combine them. I could use the path directly, but I felt it would'nt always be, so I read the steams, after I combine them,
everytime I run the code it std errs the following output, and creates merged.mp4 with 0 bytes, help me find the mistake

  


  code

  


  
const {spawn} = require("child_process");
const fs = require("fs")


var audio = fs.createReadStream("audio.aac")
var video = fs.createReadStream("video.mp4")



var ffprocess = spawn("ffmpeg",[
    '-y',
    '-i', 'pipe:0', 
    '-i', 'pipe:1',  
    '-c', 'copy',  
    '-f', 'mp4',    
    'pipe:2',   
])

video.pipe(ffprocess.stdin)
audio.pipe(ffprocess.stdin)


ffprocess.stdout.on("data")


ffprocess.stderr.on("data", (data) => {
    console.log(`ffmpeg stderr ${data}`);
});
  
ffprocess.on("close", (code) => {
if (code === 0) {
    console.log("FFmpeg process exited successfully");
} else {
    console.error(`FFmpeg process exited with code ${code}`);
}
});


  


  output,

  


  ffmpeg stderr ffmpeg version 6.0-6ubuntu1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 13 (Ubuntu 13.2.0-2ubuntu1)
  configuration: --prefix=/usr --extra-version=6ubuntu1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --disable-sndio --enable-libjxl --enable-pocketsphinx --enable-librsvg --enable-libvpl --disable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-librav1e --enable-shared
  libavutil      58.  2.100 / 58.  2.100

ffmpeg stderr   libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100

ffmpeg stderr Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:0':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2023-07-31T07:06:25.000000Z
  Duration: 00:00:34.64, start: 0.000000, bitrate: N/A

ffmpeg stderr   Stream #0:0[0x1](und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 640x360 [SAR 1:1 DAR 16:9], 334 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
    Metadata:
      creation_time   : 2023-07-31T07:06:25.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 07/31/2023.
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      creation_time   : 2023-07-31T07:06:25.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 07/31/2023.
      vendor_id       : [0][0][0][0]



  


  audio.aac video.mp4 sits in the same directory

  


  I have trying changing the -c flag and the other ones, but it somehow stucks and program dosent end up

  


  I have trying changing the -c flag and the other ones, but it somehow stucks and program dosent end up