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• avcodec/mpeg12dec : Limit maximum A53 CC size

  21 septembre 2020, par Michael Niedermayer

  avcodec/mpeg12dec : Limit maximum A53 CC size
  This is more than 10 times the size of the largest i found. And also alot more
  
  than our encoder could handle (our encoder is limited to max 31)
  
  Without any limit megabyte+ sized blocks can be reallocated millions of times.
  
  Sadly the SCTE-20 spec does not seem to contain any hard limit directly, so this limit here
  
  is arbitrary
  Fixes : Timeout (25sec -> 152ms)
  
  Fixes : 25714/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG2VIDEO_fuzzer-5713633336885248
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mpeg12dec.c

• How to switch from yuyv422 to yuv420p for better framerate in ffmpeg on Windows 10

  14 mai 2019, par someone from belgium is called

  I upgraded PC from Windows 7 to Windows 10, as it is discontinued. Problem is,
  I had low latency monitoring and recording solution with FFmpeg.

  After the upgrade, Logitech camera switched from yuv420p to yuyv422 and I lost 30 fps support at 1280x720. Now it is only limited to 10 FPS.

  Tried different drivers, it still yuyv422

  Here is a code i use.

  ffmpeg -y -loglevel panic -hwaccel qsv -threads 1 -fflags nobuffer -flags low_delay -strict experimental -f dshow -video_size 1280x720 -framerate 10 -pixel_format yuyv422 -i video="C922 Pro Stream Webcam" -codec:v libx264 -preset ultrafast -crf 24 -tune zerolatency -map 0 -f segment -segment_time 600 -segment_wrap 2 -reset_timestamps 1 dvr_%%04d.avi -codec:v copy -f nut - | ffplay -fflags nobuffer -flags low_delay -vf scale=1920x1080:flags=lanczos -window_title "kamera" -noborder -left 1920 -top 150 -fast -framedrop -

  I really need low CPU, no latency monitoring at minimum 24 FPS and recording capabilities. File size doesn’t matter so much.

  Using mjpeg eats CPU like crazy.

• fulent-ffmpeg arguments inputs are invalid | nodejs

  23 août 2020, par Dean Van Greunen

  how would I write this command

  


  ffmpeg -i input.mov -preset slow -codec:a libfdk_aac -b:a 128k -codec:v libx264 -pix_fmt yuv420p -b:v 2500k -minrate 1500k -maxrate 4000k -bufsize 5000k -vf scale=-1:720 output.mp4

  


  as a node fluent-ffmpeg command ?

  


  what I have this

  


  function convert(input, output, callback) {
  ffmpeg(input)
    .output(output)
    .outputOptions(
      "-preset","slow","-codec:a","libfdk_aac","-b:a","128k","-codec:v","-pix_fmt","-b:v","2500k","-vf","scale","\"-1:720\""
    )
    .on("end", function () {
      console.log("conversion ended");
      callback(null);
    })
    .on("error", function (err) {
      console.log("error x: ", err);
      callback(err);
    })
    .run();
}


  


  I get errors saying the arguments are invalid. such as but not limited to :

  


  

  • Error: ffmpeg exited with code 1: "-1:720": Invalid argument

  


  


  and other variations