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• Fluent-FFMPEG redirects to home page when recording is finished

  25 mai 2022, par Myles Jefferson

  I am using fluent-FFmpeg with my node.js and express server to record videos from an RTSP stream. The issue I am encountering is that once the command to record the video is finished, my React client-side always redirects to the home page of my application, even though this is not the behavior I want. I want the user to remain on the page with the RTSP stream and just receive a toast notification indicating that the recording is finished. With this issue, the page redirects before the notification has a chance to display. Is this an issue with my server-side or client-side code ?

  


  Node.js

  


  export const startRecording = async (req, res) => {
  const camera = req.params;
  if (camera.id in runningCommands) { return res.json({ "status": "failure", "error": "Recording already in progress" }) }
  const { recordTime, uid } = req.body;
  let conn = createConnection(config);
  conn.connect();
  let query = 'SELECT * FROM cameras WHERE id = ?';
  conn.query(query, [camera.id], (error, rows) => {
    if (error) { return res.json({ "status": "failure", "error": error }) }
    const camera = rows[0];
    const { ip, fname } = camera;
    const currentDate = new Date().toLocaleString().replace(/[:/\s]/g, '-').replace(',', '');
    const filename = `${fname}-${currentDate}`;

    try {
      // FFmpeg command to start recording
      const command = ffmpeg(`rtsp://${ip}/axis-media/media.amp`)
        .videoCodec('libx264')
        .size('1280x720')
        .duration(recordTime)
        .on('start', commandLine => {
          runningCommands[camera.id] = command
          console.log(`Spawned Ffmpeg with command: ${commandLine}`)
        })
        .on('error', err => console.error(err))
        .on('end', () => {
          delete runningCommands[camera.id]
          console.log('Recording Complete')
          takeScreenshot(filename, `./public/recordings/mp4/${filename}.mp4`)
          conn.query('INSERT INTO recordings (uid, cid, filename) VALUES (?, ?, ?)', [uid, camera.id, filename], () => conn.end())
          res.json({ "status": "success", "message": "Recording ended" })
        })
        .save(`./public/recordings/mp4/${filename}.mp4`);
    } catch (error) { console.error(error)}
  })
}


  


  React :

  


  const handleRecording = async () => {
    try {
      setIsRecording(true)
      const futureTime = new Date().getTime() + recordTime * 1000
      const finishedTime = new Date(futureTime).toLocaleTimeString()
      setTimeRemaining(finishedTime)
      const { data } = await publicRequest.post(`record/startRecording/${id}`, { recordTime, uid: user.id })
      window.location.reload(false)
      if (data.status === 'success') {
        setIsRecording(false)
        toast('Recording finished!', { type: 'success' })
      } else {
        setIsRecording(true)
        toast('Recording already in progress!', { type: 'error' })
      }
    } catch (error) {
      console.error(error)
    }
  }


  


• delay in lyrics shown when concat video with lyrics with an intro video using ffmpeg

  19 mars 2018, par no name

  I have a video with lyrics I add the lyrics used ffmpeg too. I have the lyrics in lrc formate and i change it to ass lyrics formate then I start to add it to my video using this command

  ffmpeg -i video.mp4 -vf "ass=out.ass,fade=in:0:30" -y amr.mp4

  I use fade=in:0:30 to make fade in the start of the video so when I start merge intro video my original video not start at once but to have some fade in, in the start to have a good view.
  then I start to add the intro video using a text file which has this

  file intro.mp4
  
  file amr.mp4

  then I merge them using this command

  ffmpeg -f concat -safe 0 -i out.txt -c copy -y final.mp4

  i got these message

  [mov,mp4,m4a,3gp,3g2,mj2 @ 03eadb80] Auto-inserting h264_mp4toannexb bitstream filter
  
  [mp4 @ 06419580] Non-monotonous DTS in output stream 0:1; previous: 310272,     current: 285626; changing to 310273. This may result in incorrect timestamps in   the output file.

  repeated many times.
  when i watch the final video the lyrics have some delay from the sound the problem appeared when I merge the intro video but without it the lyrics have no problem so what I made wrong make the lyrics shown in this way and not in the right timing as it should have no problems as I merge only the intro video and after add the lyrics to the original one
  Thanks in advance

• Why the bitrate shown during processing differs so much from the final bitrate after processing using ffmpeg ?

  28 juillet 2016, par rpgmaker

  Using ffmpeg, why the bitrate shown during processing differs so much from the final bitrate after processing ?

  This command on a 1080p source :

  ffmpeg -i "$name" -i "$subname" -map 0 -map 1 -vf scale=-1:720 -c:v libx264 -preset veryslow -crf 21 -c:a aac -b:a 256k -c:s:0 srt -disposition:s:0 default -metadata:s:s:0 language=eng -metadata:s:v:0 title="$title" "$new"

  Shows this output :
  

  Which essentially averages 1300-1400 kBit/s. But when I calculate the bitrate of the resulting video using mkvinfo -t the bitrate shown sits at 970-1000 kBit/s and that’s not even close to averaging the 1300 kBit/s shown throughout processing. What is causing the disparity ?