Recherche avancée

Sur d’autres sites (9057)

• FFMPEG Determine average color of an area of a video

  12 novembre 2019, par Naved Khan

  I have a use case where I’d want to insert one of two watermarks - one designed for a dark-ish background, the other for a light background into a video. Let’s say that I’d want to do this on the top right corner of the video.

  How do I determine the average color of the top right section of the video ? Post this, how do I determine which watermark to use by looking at the average color ?

  I have a solution right now where I am taking equally spaced screenshots and then measuring the average color, but it’s excruciatingly slow, especially for longer videos.

  # Calculate average color
  
      black_distances = []
  
      white_distances = []
  
  
  
      movie = FFMPEG::Movie.new(video_file)
  
      (0..movie.duration / 10).each do |second|
  
  
  
        # extract a frame
  
        filename = "tmp/watermark/#{SecureRandom.uuid}.jpg"
  
        movie.screenshot filename.to_s, seek_time: second
  
  
  
        # analyse frame for color distance
  
        frame = MiniMagick::Image.open(filename)
  
        frame.crop('20%x20%+80%+0')
  
        frame.resize('1x1')
  
        pixel = frame.get_pixels.flatten
  
  
  
        distance_from_black = Math.sqrt(((black[0] - pixel[0])**2 + (black[1] - pixel[1])**2 + (black[2] - pixel[2])**2))
  
        distance_from_white = Math.sqrt(((white[0] - pixel[0])**2 + (white[1] - pixel[1])**2 + (white[2] - pixel[2])**2))
  
  
  
        black_distances.push distance_from_black
  
        white_distances.push distance_from_white
  
  
  
        File.delete(filename) if File.exist?(filename)
  
      end
  
  
  
      average_black_distance = black_distances.reduce(:+).to_f / black_distances.size
  
      average_white_distance = white_distances.reduce(:+).to_f / white_distances.size

  I am also confused about how to use the resulting average_black_distance and average_white_distance to determine which watermark to use.

• Quires about a GUI application Video editor in Python

  23 décembre 2020, par Education 4Fun

  I'm new to GUI in python I wanna build a small video editor with few extra functionalities than normal video editors like bulk editing is the most imp functionality which I did work on it and made possible using FFMPEG(few modules) Now I wanna add GUI like a normal software (VSDC, filmora) and the timeline for the video to drop them like the whole GUI is what I need work on
So I need some references to GUIS and which to use so I can make my application professional or if u have any idea abt any open-source video editor please share references That help a lot
  
Please suggest me libraries too.
  
Thank you
  
A small reference of VSDC editor
  


  


• Build android native application for many types of CPU

  30 novembre 2012, par tunght_53

  I want to use ffmpeg library in my application so I wrote an Android.mk file as follow :

  LOCAL_PATH := $(call my-dir)
  
  TOP_LOCAL_PATH := $(LOCAL_PATH)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_C_INCLUDES += $(LOCAL_PATH)/android-8/armv5te/include/
  
  
  
  LOCAL_CPP_EXTENSION := .cpp
  
  LOCAL_C_EXTENSION := .c
  
  
  
  LOCAL_CFLAGS := -O3
  
  LOCAL_MODULE    := FilterEngine
  
  LOCAL_SRC_FILES := \
  
      decoding_encoding.c \
  
  
  
  LOCAL_LDLIBS    := -lm -llog -ljnigraphics -L$(LOCAL_PATH)/android-8/armv5te/lib/ -lavcodec -lavfilter -lavutil -lm -lz
  
  LOCAL_STATIC_LIBRARIES := avcodec avfilter avutil
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  This make file only builds the library for ARM v5 CPU, to create an ARM v7 build of the library I have to modify the Android.mk file (change from armv5te to armv7a). How can I specify 2 types of CPU in the make file so I can build the library for both CPUs at one.
  Thanks in advance.