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• python suggests ffmpeg installation when it is installed

  17 janvier 2021, par FNTE

  I have a problem related to the bar_chart_race python package. I have installed ffmpeg but when I execute my code, I get :

  


  You do not have ffmpeg installed on your machine. 
Download from here: https://www.ffmpeg.org/download.html.


  


  I know that I have used this package before and it was all good. I have installed ffmpeg version :

  


  ffmpeg -version
ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.3.1 (GCC) 20200523


  


  Do you know what I can do ? I have bin folder in path.

  


• Can ffmpeg create folder by itself in windows ?

  20 octobre 2022, par ThanhPhan

  I'm recording RTSP stream from camera into mp4 files in Windows machine and I want to save files in separate folder by day using strftime option (name format like D:/Video/YYYY-MM-DD/). I really want to know that does ffmpeg have ability to create folder by itself or do I have to create it by external programs ?

  



  For example, I want to use ffmpeg command like below :

  



  ffmpeg -rtsp_transport tcp -i  \
    -f segment -strftime 1 -segment_time 01:00:00 -segment_atclocktime 1 \
    -segment_clocktime_offset 30 -segment_format mp4 \ 
    -an -vcodec copy -reset_timestamps 1 \
    D:/Video/%Y-%m-%d/record_%H_%M_%S.mp4


  


• Stream video from bitmap frames with x264 and ffmpegs swscale

  25 mars 2016, par Jones

  The goal is to create a video stream from bitmap frames.

  Current solution : I am streaming raw 24bpp bitmap data over tcp from my machine to a "remote" server, to distribute the frames to the clients. This works well when everything runs on my local machine.

  Problem : The size of a frame is 1440000 (800*600*3) bytes, I only have a 2Mbps upstream and I need the video to be 25 frames per second with a resolution of 800x600.

  Approach : So after a bit of research my approach would be to encode the bitmap frames into h264 and stream the resulting video.

  Current situation : I compiled x264 and ffmpeg (for swscale, to convert RGB to YUV) and I am able to encode 24bpp bitmap Frames with x264. The last action in my test program is a call to x264_encoder_encode. The bitmap data in the test program is randomly generated for every frame.

  Now to my question(s) :

  Where do I go from here ? TCP, UDP, RTMP ? Which data would be transfered ? Do i just transmit the resulting frame from x264_encoder_encode ?
  Which still has a size of 140000 bytes, according to the return value of the function. That would result in
  (25*140000 = 3500000) 3,5 Mbps which is still greater than the 2Mpbs I have available.

  While I dont really know how (yet !), I am confidend that this task is feasable. For example, here is a spreadsheet displaying needed bandwith for different resolutions for streaming platforms like twitch.tv (using RTMP).

  My current x264_param (from this post) looks like this (just fyi) :

  x264_param_default_preset(&param, "veryfast", "zerolatency");
  
  param.i_threads = 1;
  
  param.i_width = width;
  
  param.i_height = height;
  
  param.i_fps_num = fps;
  
  param.i_fps_den = 1;
  
  // Intra refres:
  
  param.i_keyint_max = fps;
  
  param.b_intra_refresh = 1;
  
  //Rate control:
  
  param.rc.i_rc_method = X264_RC_CRF;
  
  param.rc.f_rf_constant = 25;
  
  param.rc.f_rf_constant_max = 35;
  
  //For streaming:
  
  param.b_repeat_headers = 1;
  
  param.b_annexb = 1;
  
  x264_param_apply_profile(&param, "baseline");

  thank you in advance.