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• 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,

• 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" ';
  
              }

• batch converting in ffmpeg from jgp to gif while changing the resolution

  15 janvier 2018, par zlbooth

  Hi this is my first post - excuse how basic it is !

  I’ve got a line for batch converting jpg to gif in Mac

  for i in *.JPG; do 
  
     ffmpeg -i "$i" "${i%.*}.gif"
  
  done

  This line is from Lord Neckbeard’s answer to this post. How do you convert an entire directory with ffmpeg ?

  I just want to add one more parameter which is batch converting the resolution as well as the file type.
  inputting this doesn’t work :

  for i in *.JPG; do 
  
     ffmpeg -i "$i" -s:v 640x480 "${i%.*}.gif"
  
  done

  Any solutions much appreciated !