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• ffmpeg itsoffset doesn't work with pcm audio and raw 264 video

  28 janvier 2019, par Danny

  I need to create an MP4 container with data from a hardware encoder. The encoder outputs PCM 16-bit signed audio and raw H.264 ES video frames.

  This ffmpeg command line I’ve got works but the audio and video are not sync’d.

  From other posts I know that itsoffset only works with video and probably doesn’t work with -v copy

  I’ve confirmed that applying an itsoffset has no effect.

  Here’s the command line. Any suggestions ?

  One post suggested itsoffset works if you re-encode the video. But doing that needs CPU power and adds latency. (And what’s the point of a hardware encoder then ?)

  ffmpeg -f s16le -ar 44.1k -ac 2      -i Audio_20190110-165736.pcm 
  
         -fflags +genpts -itsoffset -5 -i Video_20190110-165736.264
  
         -c:v copy -c:a aac -b:a 128k 
  
         -f mp4 -movflags +faststart  output.mp4

  EDIT I

  Here is a link to the audio/video input files referenced in the above command.

• Texture bound to texture unit 0 is not renderable

  2 décembre 2018, par Trying_To_Understand

  I followed this tutorial https://github.com/phoboslab/jsmpeg. I have an open wesocket that gets the data. Sometimes, it’s take a long time to the ffmpeg (on a remote computer) to get the data from my ip camera, so I wrote a setTimeout function that waites for 10 sec to be "sure" that the ffmpeg getting the data from the ip camera. If I remove this setTimeout function this error will show up :

  [.WebGL-0000020CFA5C04D0]RENDER WARNING : texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.

  This is my code for showing the stream to the client :

  this.dataService.getDataByParam(camera.CameraId.toString())
  
    .subscribe(
  
    (result: any) => {
  
  
  
      setTimeout(() => {
  
        this.ws = new WebSocket('ws://' + result);
  
        $(document).ready(() => {
  
  
  
          this.player = new jsmpeg(this.ws, {
  
            canvas: document.getElementById("canvas"),
  
            autoplay: true,
  
            audio: true,
  
            pauseWhenHidden: false,
  
          });
  
  
  
        })
  
      }, 10000);
  
    },
  
    (error: Error) => {
  
      this.streamErrorMsg = "Problem with the server, please try again after some time."
  
    });
  
   }

  How can i know for sure that the ffmpeg has connected successfully to the camera and started to convert the data on the client ? i want to avoid writting the setTimeout function.

• do something with script output

  3 novembre 2017, par Opolo Webdesign

  I’m lazy :) so I would like to automate some things on my network. Currently I’m running a script that automatically downloads the series I watch every week. Based on what is downloaded another script searches the web for subtitles. Some downloads however have subtitles with them, so searching for subtitles is not necessary. I would like to check every download for subtitles and get notified (or better move the file) if the file has the correct subtitles.

  I started with the following :

  find /volume2/Downloads/ -type f -mmin -30 | while IFS= read -r file; do
  
      ffmpeg -i "${file}"
  
  done

  This works and shows me the output of the ffmpeg command for each file newer than 30 minutes. I would like to work with the result given by ffmpeg so that when certain characters are present in the output, I’m notified via mail. My Linux scripting skills however stop at the script I got. I’m a web developer so I understand the logic behind a script like this, but not the specific code or commands.

  Characters that I’m looking for :

  • (eng) : Subtitle :
  • (dut) : Subtitle :

  Can this be done ?

  Edit :

  I did some more research and did some changes to my script :

  find /volume2/Downloads/ -type f -mmin -60 | while IFS= read -r file; do
  
      if ffmpeg -i "${file}" | grep -q '(dut): Subtitle:'; then
  
          echo "matched"
  
      fi
  
  done

  Instead of "matched" it shows the ffmpeg output, but it’s probably a step in the right direction ?