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• 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 !

• 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,