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• 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 !

• How to steam FFmpge video with FF server

  22 juin 2018, par Amit Awinash

  Requirement : Let say I need to generate a two hours of video using FFmpeg along with some text and audio.

  The FFmpeg will take 2 hours + some time to generate the video and only then I can stream the video.

  Is there any possible way to reduce the waiting time to stream the video ?

  In other words "Can I stream the video as soon as (Or with a little delay) the FFmpeg will start adding text and audio" ?

• How to simplify ffmpeg commands and efficiently ?

  24 février 2021, par Siva Kumar

  i'm quite new to ffmpeg and i've been learning how to make a 5 hour videos which loops for 5 hours and also add a intro video in the start of the video and at a outro/endscreen video at the end. I would like to know how i could do it more efficiently since i feel it's really taking a long time and too much work. My process and command's are as follows :

  


  video specs : 3840x2160 , 60fps , 18M bitrate, hevc265

  


  


  1. First i create a video of intro and outro/endscreen and save them as .mp4 format(both are 10secs long) using adobe premier.

     


  


  2. i create a audio using adobe audition for the x amount of duration i want it to play, in this case 5 hours

     


  


  3. I create the main video(which is 10 secs long) which i want to make it loop for 5 hours or any amount of time i want(this takes alot of time and is a huge file size and also adding name of the videos in the loop.txt etc video1.mp4, video2.mp4 till i reach to 5 hours), i use the command :
ffmpeg -f concat -i loop.txt -c copy main5hours.mp4

     


  


  4. Than i concat the intro,main,outro/endscreen videos together using :
ffmpeg -f concat -i files.txt -c copy videowithoutaudio.mp4

     


  


  5. Than merge video and audio using :
ffmpeg -i videowithoutaudio.mp4 -i audio.flac -c:v copy -c:a copy finalvideo.mp4

     


  


  


  So this process takes a lot of time and file size and want some advice how i could do this more efficiently saving myself both time and file size and less work.

  


  I read that i could also overlay the intro and endscreen videos but not sure how to do them and will it make any difference ?
p.s : i'll be using the same intro and endscreen videos for all other videos i'll be making. Thanks in advance for any advice and help.