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• How to set AV_FRAME_FLAG_DISCARD with avcodec_open2

  15 novembre 2024, par Christoph

  I want to discard corrupted H.264 frames, but I've been unable to achieve this. I've tried setting flags after creating the context, as well as using options, but neither method has worked, and I still see the corrupted frames. examples online demonstrate this with a format context, but in my case, I'm feeding a bytestream directly from a socket.

  


  Options version

  


  ffmpeg.av_dict_set(&options, "fflags", "discardcorrupt", 0);
var ret = ffmpeg.avcodec_open2(_CodecContext, _decodingCodec, &options);
ffmpeg.av_dict_free(&options);


  


  Flags version

  


  var ret = ffmpeg.avcodec_open2(_CodecContext, _decodingCodec, null);
_CodecContext->flags |= ffmpeg.AV_FRAME_FLAG_DISCARD;


  


  I want to avoid errors like :

  


  [h264 @ 000001fb6302dfc0] decode_slice_header error
[h264 @ 000001fb6302dfc0] decode_slice_header error
[H264 Decoder @ 000001fb70778740] Broken frame packetizing
[h264 @ 000001fb6302dfc0] illegal short term buffer state detected


  


  Either avcodec_send_packet or avcodec_receive_frame return an error, return value is always 0. Currently i cant catch this and i dont want using a global logging checking because it could be that i have 16 instances for my decoder. (Cctv grid). I using ffmpeg.autogen (c#)

  


• Programmatically convert multiple midi files to wave using timidity, ffmpeg, and bash

  21 mai 2014, par Kyle Nevling

  I am trying to build a script to do as the title says, but I am somewhat unfamiliar with Bash and other online resources have only been so helpful.

  #! /bin/bash
  
  function inout  #Create Function inout
  
  {
  
      output[0]=" " #Initialize variables
  
      input[0]=" "
  
      count=1
  
      while [ "$count" -lt  10 ]; #Start loop to get all filenames
  
      do
  
          echo "Grabbing filename"             #User feedback
  
  
  
          input=$(ls | grep 0$count | grep MID | sed 's/ /\\ /g') #Grab filename
  
          #Replace ' ' character with '\ '
  
          output=$(echo $input | tr 'MID' 'mp3')
  
          #set output filename
  
          echo $count #Output variables for testing
  
          echo $input
  
          echo $output
  
          let count+=1 #Increment counter
  
  
  
          echo "converting $input to $output." #User feedback
  
          foo="timidity $input -Ow -o - | ffmpeg -i - -acodec libmp3lame -ab 320k $output"
  
          echo $foo
  
          #The last two lines are for the purpose of testing the full output
  
          #I can get the program to run if I copy and paste the output from above
  
          #but if I run it directly with the script it fails
  
  
  
      done
  
  }
  
  
  
  inout

  I am trying to figure out why I can’t just run it from inside the script, and why I must copy/paste the output of $foo

  Any ideas ?

• Reduce ffmpeg CPU usage with h265 [closed]

  23 septembre 2024, par Neskelogth

  I have a video file to convert using ffmpeg on Ubuntu 22.04. The input uses the codec h264 and I want to convert it to h265 (mainly for storage capacity reasons). The output of ffmpeg -version is

  


  ffmpeg version N-113725-g37702e2066 Copyright (c) 2000-2024 the FFmpeg developers
built with gcc 11 (Ubuntu 11.4.0-1ubuntu1~22.04)
configuration: --enable-nonfree --enable-cuda-nvcc --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64 --disable-static --enable-shared --enable-libx265 --enable-gpl
libavutil      58. 39.100 / 58. 39.100
libavcodec     60. 39.101 / 60. 39.101
libavformat    60. 21.101 / 60. 21.101
libavdevice    60.  4.100 / 60.  4.100
libavfilter     9. 17.100 /  9. 17.100
libswscale      7.  6.100 /  7.  6.100
libswresample   4. 13.100 /  4. 13.100
libpostproc    57.  4.100 / 57.  4.100


  


  I saw online that one of the options of ffmpeg is -threads, but apparently it does not work, since using ffmpeg -i input.mp4 -c:v libx265 -c:a copy output.mp4 and ffmpeg -i input.mp4 -c:v libx265 -c:a copy -threads 2 output.mp4 seem to be exactly the same in terms of CPU usage as shown by htop. Is there something wrong in my usage of -threads ?