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• ffmpeg complex_filter fadeout not working

  30 novembre 2017, par Macmee

  Essensially what I am trying to do is concat a.mp4 with b.mp4, display my set of %c.png overlayed ontop for the entire duration of the video and also show d.png overlayed ontop but only for 1 second and then have it fade out. ALL of this works except that d.png remains overlayed and never fades out :

  ffmpeg -i ./temp/a.mp4 -i media/b.mp4 -i media/splash/%c.png -i ./temp/d.png -y -filter_complex [0:v]scale=568x320,setpts=PTS-STARTPTS[v0];[1:v]scale=568x320,setpts=PTS-STARTPTS[v1];[2:v]scale=212:242,setpts=PTS-STARTPTS[v2];[3:v]trim=duration=0.5,fade=t=out:st=0:d=0.5[3:v];[v0][0:a][v1][1:a]concat=n=2:v=1:a=1[bg][a];[bg][v2]overlay=(W-w)/2:(H-h)/2,format=yuv420p[v];[v][3:v]overlay=(W-w)/2:(H-h)/2,format=yuv420p[v] -map [v] -map [a] -r 29.97 -vcodec libx264 -s 568x320 -flags +loop -b 400k -bufsize 4M -bt 256k -refs 1 -coder 0 -me_range 16 -subq 4 -partitions +parti4x4+parti8x8+partp8x8 -g 250 -keyint_min 25 -level 30 -qmin 10 -qmax 51 -qcomp 0.6 -trellis 2 -sc_threshold 40 -i_qfactor 0.71 -acodec aac -strict experimental -ab 80k -ar 48000 -ac 2 -strict experimental -f mp4 -metadata:s:v:0 rotate=90 ./temp/1428723401371.mp4

  Lord Neckbeard, I know you’re out there. I’ve been reading your stackoverflow posts on fade in/out with complex_filter for a few hours now and nothing I’ve tried has succeeded. Please Lord, accept the above as my humble offering to you and help me fadeout d.png after 1 second.

• c# Create NAL unit from following structure

  30 mai 2014, par user1411499

  Im wanting to send my desktop as an avc h.264 stream.

  The pseudocode would go something like :

  1) Capture screen as bitmap
  2) Encode bitmap into h.264
  3) Create NALU header
  4) Send header and payload
  5) Rinse and repeat.
  

  My questions are :
  How would I go about creating the payload ? Would I use FFMPEG to convert the Bitmap into h.264 format ?

  I have the following spec for creating the NALU :

  

  How would I go about creating this in a c# array of bytes ? (Im not that familiar with bit shifting operations) e.g ByteArray[0] = value, ByteArray1 = value

  Im fairly new to this streaming thing so any help/code samples would be great. Im not looking for references to ISO standards(I understand they are an important part), after doing a few hours of searching I found this link http://aviadr1.blogspot.co.nz/2010/05/h264-extradata-partially-explained-for.html and it was a breath of fresh air as it was someone explaining it from the beginning !

  I am also not searching for a library to do this for me as I need learn the fundamentals.

  Any help would be great thanks !

• ffmpeg problem video duration of an hour and a half

  14 mai 2024, par Bruno Munné

  When start record i call an api /start-record which does :

  


  const ffmpeg = spawn("ffmpeg", [
        "-i",
        rtsp,
        "-c:v",
        "copy",
        "-an",
        "-f",
        "flv",
        `${filename}.flv`,
      ]);
ffmpegProcesses[rtsp] = {
        process: ffmpeg,
        filename,
      };


  


  When stop the record i call an api /stop-record which does :

  


  ffmpegProcesses[rtsp].process.kill("SIGKILL");
ffmpegProcesses[rtsp].process.on("exit", async () => {
   const ffmpeg = spawn("ffmpeg", [
          "-i",
          `${filename}.flv`,
          "-c:v",
          "libx264",
          "-preset",
          "fast",
          "-crf",
          "30",
          "-an",
          `${filename}.mp4`,
        ]);

    ffmpeg.on("exit", async () => {
        uploadToS3()
    })

})


  


  If the recording is less than or equal to approximately 1 hour it works perfectly, but if the recording is 1 and a half hours it already breaks and it does not correctly generate the files, nor the flv nor the conversion to mp4

  


  I hope my program works the same way it does for 1 hour recordings