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• FFmpeg get a crop without tying it to a specific time period

  30 avril 2021, par Дмитрий Варзанов

  crop = sub.check_output("ffmpeg -i "+file+" -ss 5 -t 30  -vf cropdetect -f null - 2>&1 | awk '/crop/ { print  $NF }' | tail -1", shell=True).decode().strip()


  


  In order not to bind to a time interval, it is possible to analyze the frames for the entire time period of the video file.

  


  It would be a solution if this process was performed quickly, instantly. But unfortunately, it can take hours, depending on the duration of the video

  


  Execute the command to get the duration of the video, and then calculate and set the time to get the crop. We'll have to build forests...

  


  I am looking for a solution in which there will be no need to set the time and at the same time the task will take the least amount of time.

  


  Perhaps someone has a solution ?

  


• What could be the stable choise for multi stream application : OpenCV , vlcQt native or Qt multimedia media

  30 septembre 2018, par 2adnielsenx xx

  I am trying to build a multistream (8 channel) tool which should run 24 hours to receive stream feeds(mjpeg, ts, mp4, etc) make some prepares on the frames and show on the screen.

  I read somewhere that OpenCV is could make issues with multi Videocapture.

  What will be the best stream capture framework for a stable and less painful approach to do this application ?

  Choosing the stream capture is the important part.

  Thanks

• Node Media Server not stream when i try to pass the argument "transpose=1" to ffmpeg

  28 mai 2020, par joao.jlf4

  I'm using node-media-server to stream to instagram, and i need to rotate the original vídeo, to be portrait. I know that there is a flag on ffmpeg called transpose (there is rotate too), but when i pass it on node_relay_session.js on 24 line at the argv array, it returns me a "[Relay end]" on console, and it does'nt stream. When I remove the transpose flag from argv array it backs to stream normaly. Here is my config to nms :

  



  import NodeMediaServer from 'node-media-server';
import removeBarOfRtmpUrl from './utils/removeBarRtmpUrl';
import path from 'path';
import { remote } from 'electron';

export default function(data) {

const streams = data.map(stream => ({
endpoint: removeBarOfRtmpUrl(stream.endpoint),
key: stream.key,
}))

const config = {
rtmp: {
port: 1935,
chunk_size: 60000,
gop_cache: true,
ping: 30,
ping_timeout: 60
},
http: {
port: 8000,
allow_origin: '*'
},
relay: {
// C:\Users\Usuario\Desktop\multistream\node_modules.bin\ffmpeg.exe
ffmpeg: path.join(remote.app.getPath('appData'), '..', 'Local', 'Programs', 'multistream', 'app', 'ffmpeg', 'bin', 'ffmpeg.exe'),
tasks: streams.map(stream => ({
app: 'live',
mode: 'push',
edge: ${stream.endpoint}/${stream.key},

  }))
},
};

const nms = new NodeMediaServer(config);
return nms;
}

// {
// app: 'live',
// mode: 'push',
// edge: 'rtmp://a.rtmp.youtube.com/live2/keyyoutube',
// },```