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• How to put watermak on video with FFMPEG,without resizing the watermark because of video resolution ?

  22 mai 2014, par Shahbaz Younis

  I’m looking for a way that the watermark picture does not get resized,if the video resolution is high or less. Right now I have this problem, if I upload a video like 720p the watermark is really small and when I upload a video that is 240p the watermark is really big. I would just like it to be only one size. Can it do that automatically ? So no matter what the resolution is the of the video the image does not resizes and stays where I put it ? Here’s the code I’m using right now

  if ($ffmpeg_ver == "old") {
  
                      $watermark = '-vf "movie='.$tv_logo_path.' [watermark]; [in][watermark] overlay=10:10 [out]" ';
  
              } else { 
  
                      $watermark = '-i '.$tv_logo_path.' -filter_complex "overlay=10:10" ';
  
              }

• Android video encoding with fr and resolution manipulation

  24 février 2017, par apSTRK

  I want to be able to take a video recorded with an Android device and encode it to a new Resolution and Frame Rate using my app. The purpose is to upload a much smaller version of the original video (in size), since this will be videos 30 min long or more.

  So far, I’ve read of people saying FFmpeg is they way to go. However, the documentation seems to be lacking.

  I have also considered using http opencv http://opencv.org/platforms/android.html

  Considering I need to manipulate the video resolution and frame rate, which tool do you think can do such things better ? Are there any other technologies to consider ?

  An important question is, since this will be long videos, is it reasonable to do the encoding in an android device (Consider power resources, time, etc.)

  Thanks in advance !

• FFMPEG, transcoding resolution error

  6 mai 2014, par Sajith Dilshan Jamal

  I am trying to convert a file using ffmpeg using the following command :

  ffmpeg input.flv -strict experimental -s 360x288 output.3gp

  I get the below error :

  The specified picture size of 360x288 is not valid for the H.263 codec.
  
  Valid sizes are 128x96, 176x144, 352x288, 704x576, and 1408x1152. Try H.263+

  The problem here is that i don’t use a command line to execute the commands, but through another program that I am coding,

  So if I am to only use the above specified resolutions, is there a command for ffmepeg so that given a codec, to retrieve the possible resolutions so that I can select the optimal one to convert with, not just for the above codec, but all codecs supported by ffmpeg.

  I have seen the documentation page of ffmpeg and the supported video resolutions but that is not what I am looking for, that is the resolutions that ffmpeg supports, not the resolutions the codec supports,

  I am looking for a command that will give me the resolutions that a given code will support

  thanks,