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• ffmpeg reverse video resolution after compression

  30 août 2018, par Mehran

  I’m trying to compress a video to mp4 format with ffmpeg.

  With scale filter :

  cmd = "-i, "+in+" -vf scale=480:-2,setsar=1:1, "+out;

  Or as simple as this :

  cmd = "-i, "+in+" "+out;

  If I try this command, the outPut will be fine in many players like potPlayer(win) or mxPlayer(android), But in some players like kmPlayer.v3(win) it’s stretched. with or without scale filter.

  I tried the same video compression with Handbrake so I find out there is nothing wrong with my player.

  The result is the same with all videos that I compressed with ffmpeg library

  And there is another problem which is more annoying, the outPut video resolution gets reversed. for Example :

  Input : w1280 h720

  Output : w720 h1280

  I googled a lot but I found nothing.

• How to set watermark resolution according to video resolution ?

  10 avril 2018, par Kiran

  Here i am trying to create a video editor with top and bottom text.I can set 2 text on top and bottom with different size, color and fonts for that text and i am converting that text to image and adding as watermark.

  But when resolution of video decreases the size of watermark image increase and vise versa.I am using ffmpeg commands.Now i am calculating like as shown below.

    if (video_width <= 300) {
  
  
  
                  Log.e("less than", "300");
  
                  water_resolution_bt = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_bt_width / 2 + 30) + ":" + getDPsFromPixels(getApplicationContext(), tv_bt_height / 2 + 15));
  
  
  
                  water_resolution = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_top_width / 2 + 30) + ":" + getDPsFromPixels(getApplicationContext(), tv_top_height / 2 + 15));
  
  
  
              } else if (video_width > 300 && video_width <= 400) {
  
  
  
                  Log.e("less than", "400");
  
                  water_resolution_bt = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_bt_width / 2 + 130) + ":" + getDPsFromPixels(getApplicationContext(), tv_bt_height / 2 + 70));
  
  
  
                  water_resolution = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_top_width / 2 + 130) + ":" + getDPsFromPixels(getApplicationContext(), tv_top_height / 2 + 70));
  
  
  
              } else if (video_width > 400 && video_width <= 600) {
  
                  Log.e("btw ", "400 and 600");
  
                  water_resolution_bt = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_bt_width + 80) + ":" + getDPsFromPixels(getApplicationContext(), tv_bt_height + 40));
  
  
  
                  water_resolution = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_top_width + 80) + ":" + getDPsFromPixels(getApplicationContext(), tv_top_height + 40));
  
              } else if (video_width > 600 && video_width <= 1000) {
  
                  Log.e("btw ", "600 and 1000");
  
                  water_resolution_bt = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_bt_width + 100) + ":" + getDPsFromPixels(getApplicationContext(), tv_bt_height + 100));
  
  
  
                  water_resolution = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_top_width + 100) + ":" + getDPsFromPixels(getApplicationContext(), tv_top_height + 100));
  
  
  
              } else if (video_width > 1000) {
  
                  Log.e("grthr than ", "1000");
  
                  water_resolution = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_top_width * 2 + 20) + ":" + getDPsFromPixels(getApplicationContext(), tv_top_height * 2 + 20));
  
                  water_resolution_bt = String.valueOf(getDPsFromPixels(getApplicationContext(), tv_bt_width * 2 + 20) + ":" + getDPsFromPixels(getApplicationContext(), tv_bt_height * 2 + 20));
  
  
  
              }

  This will not give accurate results.Can anyone suggest any other calculation methods.I have also tried with "drawtext" method .It also have same issue.

• get video resolution from ffpmeg [duplicate]

  22 mai 2018, par MertTheGreat

  This question already has an answer here :

  • TypeError : can’t use a string pattern on a bytes-like object in re.findall()
    
    2 answers
    
  • How can I get the resolution (width and height) for a video file from a linux command line ?
    
    9 answers
    

  I try to get resolution of a video file, and hope this code would help thanks to arionik from GitHub

  from subprocess import Popen, PIPE
  
  
  
  def getWH(pathvideofile):
  
  in_pipe = Popen(["ffmpeg", "-i", "\"%s\"" % (pathvideofile)], stderr=PIPE)
  
  lines = in_pipe.stderr.readlines()
  
  for line in lines:
  
      rx = re.compile('.+Video.+, (\d{2,4})x(\d{2,4}).+')
  
      m = rx.match(line)
  
      if m is not None:
  
          w = int(m.group(1))
  
          h = int(m.group(2))
  
  return w, h

  But get this error code :

  m = rx.match(line)
  
  TypeError: cannot use a string pattern on a bytes-like object

  What it could be ?

  Thank you,