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• FFMPEG Windows : need to add mix audio to this code

  28 mai 2020, par a4n6c

  I have this and now I wish to add a background sound from mp3 in the area where I am removing audio.

  



  ffmpeg -i "demo.mp4" -vcodec copy -af "volume=enable='between(t,67,69)':volume=0" -y "output1.mp4"


  



  this is just one simple example shown the list of (between) can be larger than 1 line. an example will help me progress further thank you.

  


• how to explain this C language code from ffmpeg remuxing

  20 avril 2017, par Fidona

  can someone help me what the meaning of this code ? this is a code from ffmpeg remuxing code.

  static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt, const char *tag, int hours, int mins, int secs, int us, int *time )
  
  {
  
      AVRational *time_base = &fmt_ctx->streams[pkt->stream_index]->time_base;
  
      total = total + pkt->duration;
  
    //  printf( "%d:%d:%d.%d \n", hours,  mins,  secs, us );
  
      *time = av_q2d(*time_base) * pkt->pts ;
  
  }

  I’m kind of new to C language. thank you !

• KeyError : 1 on Python when the code points to a value that exists [closed]

  10 décembre 2020, par oo92

  I am using the following code to traverse a list JSON output. There are about 100 streamers I want to take screens from but the code fails after the first one where I call the ffmpeg. I put a code after the ffmpeg to see if Python is running it at all and it does :

  


  Traceback (most recent call last):&#xA;  File "/home/onur/Desktop/pythonProject/main.py", line 12, in <module>&#xA;    username = streams_now[i][&#x27;channel&#x27;][&#x27;display_name&#x27;]&#xA;KeyError: 1&#xA;auronplay it is &#xA;</module>

  


  This is my code :

  


  import streamlink, os
from twitch import TwitchClient

client = TwitchClient(client_id='frl3dqgn21bbpp6tajjvg5pdevczac')

streams_now = client.streams.get_live_streams(limit=100)

print(streams_now[2]['channel']['display_name'])

for i in range(0, 99):
  username = streams_now[i]['channel']['display_name']
  streams_now = streamlink.streams('http://twitch.tv/' + username)
  stream = streams_now["best"].url
  dir_path = os.getcwd() + '/' + username
  os.mkdir(dir_path)
  os.system('ffmpeg -i ' + stream + f' -ss 20 -vframes 10 -r 0.2 -f image2 {dir_path}/' + username + '_output_%09d.jpg')
  print(username + ' it is ')


  


  The line that throws the error is username = streams_now[i]['channel']['display_name']. However, this line cannot throw an error because I am testing it before the for loop :

  


  print(streams_now[2]['channel']['display_name'])

  


  and I get this : shroud