Recherche avancée

Sur d’autres sites (12328)

• Unrecognized option 'map 0:a ?'

  3 juillet 2020, par Bleakley

  Trying to make derivatives of silent video files is failing. My understanding is adding a trailing ? to the -map option makes ffmpeg ignore that stream if it does not exist, but its not working. The full script is below.

  


  ffmpeg -n -vsync 0 -nostdin -v info -hide_banner -stats -i "${FILE}" -movflags faststart -pix_fmt yuv420p -map 0:v -map 0:a? -c:v libx264 -vf "yadif=1,format=yuv420p" -crf "${CRFVALUE}" -preset "${PRESETSPEED}" -maxrate "${MAXRATE}"k -bufsize 1835k -c:a aac -strict -2 -b:a 384k -f mp4 "${OUTPUT}"


  


  withouth the ? after -map 0:a it works with files containing audio streams but not with silent ones. with the ? it fails all files. from the ffmpeg documentation : "A trailing ? will allow the map_channel to be optional : if the map_channel matches no channel the map_channel will be ignored instead of failing."

  


  why isn't it working here ?

  


• MobileFFmpeg - get progress of concatenation of a video

  18 mai 2020, par STerrier

  Is there a way to grab the progress of the concatenation using Mobile FFmpeg ? Mobile FFmpeg displays stats by default in the console and I can see the time length of the video which I want but I can't find a way to grab it so I can create a progress bar.

  



  Data displayed in the console
2658560kB time=01:30:40.00 bitrate=4003.5kbits/s speed=60.9x \rframe=137002 fps=1524 q=-1.0
2678272kB time=01:31:20.00 bitrate=4003.7kbits/s speed=61x \rframe=138252 fps=1528 q=-1.0

  



  func encodeWebp(m3u8: String, completed: () -> Void){
    guard let sessionid = sessionID else {return}

    let lastName: String = m3u8
    let docFolder = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
    let output = URL(fileURLWithPath: docFolder + "/OfflineSession/\(sessionid)").appendingPathComponent("\(lastName).mp4")
    let outputTxt = URL(fileURLWithPath: docFolder + "/OfflineSession/\(sessionid)").appendingPathComponent("\(lastName).txt")
    let fileName = "\(m3u8)_ffmpegData.txt"
    let textFile = URL(fileURLWithPath: docFolder).appendingPathComponent("OfflineSession/\(sessionid)/\(fileName)")

    let ffmpegCommand = "-f concat -i \(textFile) -c:v copy -c:a copy \(output) -progress \(outputTxt)"

    MobileFFmpeg.execute(ffmpegCommand)

    completed()

}


  



  GITHUB - Mobile FFmpeg
https://github.com/tanersener/mobile-ffmpeg

  


• node-rtsp-stream stop streaming after some time

  12 mai 2020, par Vishal Patel

  I am using node-rtsp-stream to display live camera streaming in web application. It's work fine but after sometime it stop streaming and display following error :

  



  1|streamca | [h264 @ 0x560869d8f380] 
1|streamca | error while decoding MB 145 65, bytestream -16
1|streamca | [h264 @ 0x560869d8f380] concealing 3904 DC, 3904 AC, 3904 MV errors in I frame
1|streamca | rtsp://username:password@ipAddress/Streaming/Channels/1: corrupt decoded frame in stream 0


  



  What is going wrong ?
My code looks like :

  



  const Stream2 = require('node-rtsp-stream');
let stream2 = new Stream2({
  name: 'name',
  streamUrl: 'rtsp://username:password@ipAddress/Streaming/Channels/1',
  wsPort: 88,
  ffmpegOptions:{
    '-stats': '',
    '-r': 22,
    '-q:v': 50
  }


  



  })