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• Limit cpu limit of process in a loop

  6 octobre 2023, par chew socks

  I am trying to execute ffmpeg in a loop over multiple files. I only want one instance to run at a time, and to only use 50% of the cpu. I've been trying cpulimit but it isn't playing nice with the loop.

  



  for i in {1..9}; do cpulimit -l 50 -- ffmpeg <all the="the" options="options">; done&#xA;</all>

  



  This spawns all nine jobs at once, and they are all owned by init so I have to open htop to kill them.

  



  for i in {1..9}; do ffmpeg <all the="the" options="options"> &amp; cpulimit -p $! -l 50; done&#xA;</all>

  



  This hangs, ctrl+c continues to the next loop iteration. These instances can only be killed by SIGKILL.

  


• Can I have time stamps on my screen recording [closed]

  27 décembre 2023, par user23160856

  I have been looking around for a way to add timestamps with dates on my screen records (I am using a Mac and have recorded them via cmd + 5). I ran into an issue of not having timestamps on the recordings which I need for a project and I have to have the timestamps on the vid recordings.

  


  I saw a few places where ffmpeg is a good option. I have managed to install it. However im unsure if theres a way for me to include the timestamps on my previous recording or would I need to record a brand new vid with ffmpeg's screen record options and if yes, I don't see any that boasts of such an option. Hoping someone is able to assist !

  


  I have downloaded ffmpeg and tried this string on a prerecorded screen recording

  


   ffmpeg -i <input /> -vf "drawtext=text=&#x27;%{localtime\:%T}&#x27;" -f flv <output>&#xA;</output>

  


  I was successful but theres 2 issues. I need the date stamp and time stamp. The second issue was that it gave it the time stamp at the current time of conversion and not the time of the recording.

  


  I am fairly new to these aspects and open to learning more !

  


• Laravel FFMpeg - FFMpeg cannot edit existing files in-place

  28 septembre 2020, par wlaskovic

  After I wanted to upload a video in the queue was returned a failed job.

  


   [2020-09-25 13:24:25][125] Processing: App\Jobs\ConvertVideoForStreaming <br /> [2020-09-25 13:24:26][125] Failed:     App\Jobs\ConvertVideoForStreaming&#xA;

  


  So I've took from the DB failed_jobs table the response and run the following :

  


    C:\ffmpeg\bin\ffmpeg.exe -y -i "C:\wamp64\www\laravel-stream\storage\app/public\WF3UL8fJTSE7BMxa.mp4" -threads 12 -vcodec libx264 -acodec libmp3lame -b:v 500k -refs 6 -coder 1 -sc_threshold 40 -flags +loop -me_range 16 -subq 7 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 -trellis 1 -b:a 128k -vf "[in]scale=720:360 [out]" -pass 1 -passlogfile "C:\Users\wlask\AppData\Local\Temp\ffmpeg-passes5f6dd36a4519fd1fev/pass-5f6dd36a452c9" "C:\wamp64\www\laravel-stream\storage\app/public\WF3UL8fJTSE7BMxa.mp4"


  


  Which returned the following :

  


  ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.1 (GCC) 20200726
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\wamp64\www\laravel-stream\storage\app/public\WF3UL8fJTSE7BMxa.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41isomavc1
    creation_time   : 2015-08-07T09:13:02.000000Z
  Duration: 00:00:30.53, start: 0.000000, bitrate: 411 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 480x270 [SAR 1:1 DAR 16:9], 301 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:02.000000Z
      handler_name    : L-SMASH Video Handler
      encoder         : AVC Coding
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 112 kb/s (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:02.000000Z
      handler_name    : L-SMASH Audio Handler


  


  


  Output C :\wamp64\www\laravel-stream\storage\app/public\WF3UL8fJTSE7BMxa.mp4 same as Input #0 - exiting

  


  FFmpeg cannot edit existing files in-place.

  


  


  This was returned after i've run the command from DB failed jobs table return.

  


  How should I solve this ?