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• FFMPEG merge two .mp4 videos - resolution distorted

  9 juin 2016, par Misha Moryachok

  I am trying to merge two .mp4 videos, and in some cases the seconds video part is distorted in the output video. Providing an example below :
  https://www.youtube.com/watch?v=wWMNTBWJ37A

  The real video is : https://www.youtube.com/watch?v=ASio-j-Epi8

  As you can see, we added intro before the real content, however, the real content is stretched.
  In my opinion it happens because first video is 1280x720 and the second is 460x720.

  Providing commands for merging videos :

  *1st step (convert the videos from .mp4 to .ts)

   ffmpeg -i videoPathMP4 -c copy -bsf:v h264_mp4toannexb -f mpegts videoPathTS

  *2nd step (merge videos)

  ffmpeg -i "concat:$video1 | $video2" -c copy -bsf:a aac_adtstoasc $meagePathMP4

  Video output is like you saw in provided videolink on youtube.
  I also tried to change the first video resolution to be like the second video :

  ffmpeg -i inputVideo.mp4 -s 460x720 outputVideo.mp4

  However it doesn’t helped.
  Is anyone know how to solve this ?
  Thanks

• Hide ffmpeg's console window when running YoutubeDL in GUI application

  23 juin 2016, par Slayther

  I’m developing a basic application which can download YouTube videos. Throughout the development, I had several quirks, including issues with formats.

  I decided to use a hopefully foolproof format syntax that youtube-dl will happily download for me in almost any case.

  Part of my YoutubeDL options look like this :

  self.ydl_opts = {
  
      'format': 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best',
  
      'quiet': True,
  
      'progress_hooks': [self.ydl_progress],
  
      'outtmpl': None
  
  }

  The outtmpl is inserted later on when output folder is chosen by the user.

  Since I’m using this format string, youtube-dl uses ffmpeg to merge(?) the audio and video if they are downloaded separately.

  When it does that, it opens very annoying console windows that capture the focus and interrupt other things I might be doing while the videos are downloading.

  My question is, how can I prevent ffmpeg or youtube-dl from creating those console windows from appearing, aka. how can I hide them ?

  EDIT :

  I’ll provide bare bones script that reproduces the problem :

  from __future__ import unicode_literals
  
  from PyQt4 import QtGui, QtCore
  
  import youtube_dl, sys
  
  
  
  def on_progress(info):
  
      print info.get("_percent_str", "Finished")
  
  
  
  ydl_opts = {
  
      'format': 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best',
  
      'progress_hooks': [on_progress],
  
      'quiet': True,
  
      'outtmpl': "C:/Users/Raketa/Desktop/%(title)s.%(ext)s"
  
  }
  
  
  
  ydl = youtube_dl.YoutubeDL(ydl_opts)
  
  
  
  class DownloadThread(QtCore.QThread):
  
      def __init__(self):
  
          super(DownloadThread, self).__init__()
  
          self.start()
  
  
  
      def __del__(self):
  
          self.wait()
  
  
  
      def run(self):
  
          print "Download start"
  
          ydl.download(["https://www.youtube.com/watch?v=uy7BiiOI_No"])
  
          print "Download end"
  
  
  
  class Application(QtGui.QMainWindow):
  
      def __init__(self):
  
          super(Application, self).__init__()
  
          self.dl_thread = DownloadThread()
  
  
  
      def run(self):
  
          self.show()
  
  
  
  def main():
  
      master = QtGui.QApplication(sys.argv)
  
  
  
      app = Application()
  
      app.run()
  
  
  
      sys.exit(master.exec_())
  
  
  
  if __name__ == '__main__':
  
      main()

  2(?) consoles appear at start of each download and 1 longer lasting console appears when both video and audio are downloaded. When downloading longer videos, the last console becomes unbearable.

  Is it possible to get rid of those ?

• poster adjustment after getting it from video

  30 juin 2016, par Jass

  I am capturing poster from this video https://www.youtube.com/watch?v=wg-kEWsL6Xc using following code. Video can be any, I am just giving example.

  shell_exec('ffmpeg -y  -itsoffset -4  -i "'.base_path().'/assets/videos/'.$file_name.'.mp4" -vcodec mjpeg -vframes 1 -an -f rawvideo -filter:v scale=1170:ih*1170/iw "'.base_path().'/assets/videos/thumbnail/'.$file_name.'.jpg"')

  Width = 1170px,

  Height= 300px (as it is background image so it does not matter)

  But I am facing adjustment problem. Following are my current views

  First : Head is cutting, here I am using css property background : url(’completepath’) center no-repeat ;
  

  Second : Showing black portion on top of head. This is the original image that I am getting from ffmpeg code.

  

  My Question : But I need image like in you tube, you can notice that in all videos we can see top portion of humans without being cutting even black portion is well adjusted.

  Currently I am downloading and testing with youtube videos but in actual job seekers will make their own videos using android/iphone or any camera and will upload on our site.

  so how i can overcome this issue means show image with proper human face and body ?

  thanks in advance.