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• Using ffmpeg to extract webvtt (SRT) subtitles

  4 mars 2021, par user15332104

  I am trying to extract SRT subtitles from the movies online with use of ffmpeg.
Unfortunately transmission drops after some segments, and there is no output SRT file

  


  Any advice which switch use ? Anything else than ffmpeg would serve the purpose here ?

  


  ffmpeg -i "https://rts-vod-amd.akamaized.net/ch/hls/11997514/8f3c162a-6224-3cac-8f47-788ef9fd24dc/index-f7.m3u8" -scodec srt berry_subs.srt

  


  (Actual movie : https://www.rts.ch/play/tv/telefilm/video/meurtres-en-berry?urn=urn:rts:video:11997514)

  


  ffmpeg -i "https://rts-vod-amd.akamaized.net/ch/hls/12003885/cd6616a8-b1bc-39f8-b900-53ab628eba9e/index-f7.m3u8" -scodec srt mlh_subs.srt

  


  (Actual movie : https://www.rts.ch/play/tv/telefilm/video/meurtres-a-mulhouse?urn=urn:rts:video:12003885 )

  


• 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 ?