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• ffv1enc_vulkan : restrict number of execution contexts to 1

  18 novembre 2024, par Lynne

  ffv1enc_vulkan : restrict number of execution contexts to 1
  This only leads to wasting memory in a single-threaded operation.
  
  Limit this to 1 for now and leave a comment.
  

  • [DH] libavcodec/ffv1enc_vulkan.c

• Execute multiple commands in background from terminal & redirecting output

  9 octobre 2016, par Guernica

  I’m running ffmpeg via an exec command from php. I need to wait for the command to finish executing and run another command to call a php script.

  I need the output to be redirected to text files.

  This i have accomplished with the following code but it wont execute in the background. PHP hangs until the script has finished executing.

  exec("ffmpeg -i INPUTFILE -f mp4 -vcodec libx264 -preset fast -profile:v main -acodec aac -strict -2 OUTPUTFILE -hide_banner 1> /tmp/1.txt 2>/tmp/1.txt && php PATH_TO_PHP_SCRIPT/complete.php id=11 1> /tmp/11.txt 2> /tmp/11.txt &");

  Any help would be greatly appreciated.

  EDIT : I’ve got the required functionality by calling my original php containing the above code from another php containing

  exec("php convert.php id=".$id."  1> /tmp/".$id."_error.txt 2>/tmp/".$id."_error.txt &");

  I would rather leave this question open to find a more elegant solution or information as to why my original code at the top doesn’t function in the way i would expect.

• How to compress video applying even blur effect

  17 octobre 2016, par Kukuster

  How to compress video applying well-looking apportioned blur effect, like in JPG image ?

  I tried some ffmpeg postprocesing libraries, they are fspp, spp, uspp (takes really long time to render), etc. I almost reached the goal using fspp with parameters 5:60:15 . But blur was stronger than needed, and it’s leave bad artifacts when i try to use less compression. Also uspp is does beautiful and compresses enough, but it’s leave about 50% of video unblured. I also haven’t much time to try all uspp features. Is there resolution special for this purpose ?

  The point is to implement video compression with the only side effect of compression approaches jpeg-compression-like blur or blur-mask-like. Also it would be very good if there is a simple option to choose between :
  1) more compress, less pretty blur / more strong blur ; and 2) less compress, prettier blur / less strong blur.

  I am used to use ffmpeg and i’m running linux, so it would be so nice if there is a way to solve this with ffmpeg.
  Here is my ffmpeg input data about the video streams :

    Duration : 00:01:03.02, start : 0.000000, bitrate : 4010 kb/s
      Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 3870 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
      Metadata :
        handler_name : VideoHandler
      Stream #0:1(eng) : Audio : aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 133 kb/s (default)
      Metadata :
        handler_name : SoundHandler
  

  Edit : attaching jpeg pictured as example of desired output :