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• Convert video using ffmpeg for watermark creation with multiple text

  19 septembre 2016, par Iura Gaitur

  I want to convert a video using FFMPEG and place a watermark with multiple texts on it. Combining the commands for placing a text and a watermark is :

  ffmpeg -i input_1.mp4 -i watermark_small.png -filter_complex "[0]overlay=10:10; [1]drawtext=enable='between(t,0,12)':fontfile=font.ttf:text='Some text' : fontcolor=black: fontsize=18: box=1: boxcolor=yellow@0.5:boxborderw=5: x=(w-text_w)/1.15:y=30, drawtext=enable='between(t,14,22)':fontfile=font.ttf:text='Next text' : fontcolor=black: fontsize=18: box=1: boxcolor=yellow@0.5:boxborderw=5: x=(w-text_w)/1.15:y=30" -codec:v libx264 -preset ultrafast output1.mp4

  Unfortunately this command puts the watermark and the first text but not the next text. I assume the problem is on -filter_complex setting. Unfortunately I don’t know how to set it in the right way in order to work. Could someone help me and say what needs to be changed in this command in order to convert it in the right way ?

• My filters seem to be applied in wrong order

  4 septembre 2020, par Jao

  I'm using ffmpeg to join frames into a video with some parameters.
Here is a sample of the commands I run :

  


  


  "ffmpeg -y -r 24 -f image2 -i "C :\Users\Pictures\me\frame%04d.bmp" -filter_complex "[0:v]select=between(n,0,76)[selected] ;[selected]crop=in_w:in_h-60-60:0:60[cropped] ;[cropped]scale=w=2ceil(2048.0/20.5):h=2ceil(858.0 /20.5) " -c:v libx264 -q:v 1 -b:v 2M "C :\Users\me\Video\output.mp4""

  


  


  When I run this command I have calculated the size of my cropping on the frames to remove black rectangles at the top and bottom of the frame (I tried using cropdetect but it doesn't fit my usecase so I'm using another soft).So my first that was that ffmpeg would crop on the input stream so it would only crop my black rectangles. But when I change my scale it crops a part of the image.

  


  So my understanding is that ffmpeg crops after scaling (maybe I'm wrong) and if I get the crop parameters on the input images it is sure the they will be wrong if I apply them on the scaled video.

  


  I tried using " ;" and "," to separate my filters. I tried naming and not naming my streams between filters. Nothing seems to solve my issue.

  


  What could I do to fix that or am I understanding the issue incorrectely ?
Thanks in advance

  


• Find video resolution and video duration of remote mediafile

  22 février 2012, par osgx

  I want to write an program which can find some metainformation of mediafile. I'm interested in popular video formats, such as avi, mkv, mp4, mov (may be other popular too). I want basically to get :

  • Video size (720, 1080, 360 etc)
  • Total runtime of video (may be not very exact)
  • Number of audio streams
  • Name of video codec
  • Name of audio codec

  There is already the mediainfo, but in my program I want to get information about remote file, which may be accessed via ftp, http, samba ; or even torrent (there are some torrent solutions, which allows to read not-yet downloaded file).

  MediaInfo library have no support of samba (smb ://) and mkv format (for runtime).

  Also, I want to know, how much data should be downloaded to get this information. I want not to download full videofile because I have no enough disk space.

  Is this information in the first 1 or 10 or 100 KiloBytes of the file ? Is it at predictable offset if I know the container name and total file size ?

  PS : Platform is Linux, Language is C/C++