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• No identifiable expectation during counting in python

  15 octobre 2022, par ALex Break

  I want to count the number of scenes(videos_files). I download many videos and cut them by the scene I count the number of videos(scenes) example : video 1 has 10 scenes video 2 has 15 scenes so the count is 25. I have an issue that it is working counting well and just from noting any expectation is to count 0 and it will start counting again I do not know why.
imports :

  


  from moviepy.video.io.ffmpeg_tools import ffmpeg_extract_subclip
from pytube import YouTube
from pytube import Channel
import re
import random
import datetime
import time
import os
from scenedetect import open_video, ContentDetector, SceneManager, StatsManager
from pytube import Playlist
import youtube_dl
import requests
from pexels_api import API


  


  find_scenes :

  


  def find_scenes(video_path,):
   

    video_stream = open_video(video_path)
    stats_manager = StatsManager()
    # Construct our SceneManager and pass it our StatsManager.
    scene_manager = SceneManager(stats_manager)

    # Add ContentDetector algorithm (each detector's constructor
    # takes various options, e.g. threshold).
    scene_manager.add_detector(ContentDetector())

    # Save calculated metrics for each frame to {VIDEO_PATH}.stats.csv.
    stats_file_path = '%s.stats.csv' % video_path

    # Perform scene detection.
    scene_manager.detect_scenes(video=video_stream)
    scene_list = scene_manager.get_scene_list()
    n=0
    for i, scene in enumerate(scene_list):
      x=scene[0].get_timecode()
      y= scene[1].get_timecode()
      x = time.strptime(x.split('.')[0],'%H:%M:%S')
      x = datetime.timedelta(hours=x.tm_hour,minutes=x.tm_min,seconds=x.tm_sec).total_seconds()
      y = time.strptime(y.split('.')[0],'%H:%M:%S')
      y=datetime.timedelta(hours=y.tm_hour,minutes=y.tm_min,seconds=y.tm_sec).total_seconds()
      
      if y > 0:
        if y-x > 1:
          ffmpeg_extract_subclip(video_path, x,y, targetname=f"test{n}.mp4")
          print(f"This is a name of video: test{n}.mp4")
          n+=1
    return n


  


  code :

  


  #Sncrape video and find chanells url
c = Channel("https://www.youtube.com/c/BuildEmpire/videos")
for url in c.video_urls[:20]:
  video = YouTube(url)
  description2 = video.description
  try:
    videos_credits = slicer(description2,"Video Credits:")
    videos_credits = reversed_slicer(videos_credits,"Thumbnail:")
    urls = re.findall(r'(https?://[^\s]+)', videos_credits)
  except Exception:
    print("Sorry but I choose bad youtube video I will try it again")

#Scrape videos from chanells
n = 0
youtube_videos_list = []
lens = 0
channel= random.choice(urls)
chanell = Channel(channel)
try:
  for video in chanell.video_urls:
      youtube_videos_list.append(video)
      n+=1
except Exception:
  print(f"Error 404 on chanell{chanell}")

print(f"This is a number of urls: {n}")

#Download and cut by scenes
lens = 0
list_of_videos = []
n = 0
full_count = 0
count_of_scenes_per_video = 0
while lens < 600:
   videos = random.choice(youtube_videos_list)
   list_of_videos.append(videos)
   z = YouTube(videos)
   lenght = z.length
   lens = lens + lenght
   print(F"downolading video: {videos}")
   download(videos,n)
   print("download completed")

   #Just for clear output
   print(" ")
   print(" ")

   print(f"This is a temorary lengt of videos {lens}")
   print(f"This is a count_of_scenes_per_video {count_of_scenes_per_video}")
   count_of_scenes_per_video = find_scenes(f"video{n}.mp4",)
   print(f"This is a count_of_scenes_per_video after find_scenes {count_of_scenes_per_video}")
   n += 1
print(f"This is a full lengt of videos {lens}")


  


  this is happening in the console :

  


  


  


• Streaming images as video on the fly using ffmpeg and ffserver

  1er décembre 2017, par AstrOne

  I have an OpenGL application that renders a 3D scene, and in every frame, it captures the OpenGL frame buffer, and saves it to a series of files (frame_1.png, frame_2.png, etc). I want to convert those images into a video stream and serve/broadcast it. From what I have read so far one solution would be to use ffmpeg and ffserver.

  There are several similar questions on StackOverflow but each one is a bit different, and they don’t ask exactly what I want. For example there are solutions to generate videos (but not streams) from images. Some others generate streams but not "live" ones. And so on.

  • I want the generated frames to be streamed as soon as possible after they are created. This is because the OpenGL application is supposed to be interactive. Latter on, a remote user should be able to send events (mouse motions and clicks) and interact with the rendered 3D scene.
  • I don’t want ffserver to do any kind of buffering because there is nothing to buffer, the frames must be served immediately.
  • Given that the frames must be served immediately, I guess I could just write the frames on top of each other. However, in that case there will be a synchronisation problem because the ffmpeg may try to read the image before the OpenGL application has finished writing on it. Any thoughts on that ?
  • In case the ffserver and the OpenGL application share the same RAM and not just the filesystem, ideally, I would like to not use files at all for the communication. I guess for my OpenGL application I could use something like mmap or some sort of shared memory, but ffmpeg can’t read from some kind of shared memory, right ?

  I would be more than grateful if someone could advice me how I need to setup the ffserver and the ffmpeg command to meet the above requirements (especially the first one).

• FFMPEG & ScrollMagic : Safari bug

  27 novembre 2020, par gusv7

  I got this site where video playback is linked to scroll position. I'm using a FFMPEG-encoded .mp4 file and ScrollMagic to handle the scroll event. It works perfectly on Chrome, Opera and FF, but crashes on Safari : the animation is delayed and the video disappears once it reaches the end of the playback on Safari OS. It also doesn't show on iOS, not in Safari or Chrome... :/

  


  Here's the markup :

  


  <section class="shaka-container padding-x-lg flex-end">&#xA;  <div class="shaka">&#xA;    <video src="/assets/maozinha.mp4" type="video/mp4" playsinline="true"></video>&#xA;  </div>&#xA;</section>&#xA;

  


  The JS :

  


  &#xA;<code class="echappe-js">&lt;script src=&quot;https://cdnjs.cloudflare.com/ajax/libs/gsap/3.5.1/gsap.min.js&quot;&gt;&lt;/script&gt;&#xA;&#xA;&lt;script src=&quot;https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.8/ScrollMagic.min.js&quot; integrity=&quot;sha512-8E3KZoPoZCD&amp;#x2B;1dgfqhPbejQBnQfBXe8FuwL4z/c8sTrgeDMFEnoyTlH3obB4/fV&amp;#x2B;6Sg0a0XF&amp;#x2B;L/6xS4Xx1fUEg==&quot; crossorigin=&quot;anonymous&quot;&gt;&lt;/script&gt;&#xA;&#xA;&lt;script&gt;&amp;#xA;  // Shaka Animation&amp;#xA;    const intro = document.querySelector(&amp;#x27;.shaka&amp;#x27;);&amp;#xA;    const video = intro.querySelector(&amp;#x27;video&amp;#x27;);&amp;#xA;&amp;#xA;    // SCROLL MAGIC&amp;#xA;&amp;#xA;    const controller = new ScrollMagic.Controller();&amp;#xA;&amp;#xA;    // Scenes&amp;#xA;    const scene = new ScrollMagic.Scene({&amp;#xA;      duration: 0,&amp;#xA;      triggerElement: intro,&amp;#xA;      triggerHook: 0,   &amp;#xA;    })&amp;#xA;    .addTo(controller);&amp;#xA;&amp;#xA;    // Video Animation&amp;#xA;&amp;#xA;    let accelamount = 0.5;&amp;#xA;    let scrollpos = 0;&amp;#xA;    let delay = 0;&amp;#xA;&amp;#xA;    scene.on(&amp;#x27;update&amp;#x27;, e =&gt; {&amp;#xA;      scrollpos = e.scrollPos / 1000;&amp;#xA;    });&amp;#xA;&amp;#xA;    setInterval(() =&gt; {&amp;#xA;      delay &amp;#x2B;= (scrollpos - delay) * accelamount;&amp;#xA;      video.currentTime = delay;&amp;#xA;    }, 24);&amp;#xA;&lt;/script&gt;&#xA;

  


  I wonder if the video encoding is the issue or how Safari processes the video playback ? I've used the following encoding for the video :

  


  First :
ffmpeg -i ~/assets/mao-final.mp4 -vf scale=960:-2 -movflags faststart -vcodec libx264 -crf 20 -g 1 -pix_fmt yuv420p mao-final-960.mp4

  


  Then,
ffmpeg -i ~/assets/mao-final.mp4 -vf scale=960:-2 -movflags faststart -vcodec libx264 -crf 20 -g 1 -pix_fmt yuv420p maozinha.mp4

  


  I'm considering changing it to a canvas animation if I can't get to a solution. Please help !