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• Android mp4 remove rotation and rotate the video stream

  4 mars 2015, par Mathijs Segers

  I’m having some issues trying to remove the rotation value of Android video’s.
  For some reason convertion tools in the cloud cannot seem to handle android’s rotation value correctly. f/e I have a portrait video recorded in 1080x1920 (so the file’s headers tell me it’s actually 1920x1080 with rotation : 90).

  So now I’m trying to convert these video’s to an actual 1080x1920 format when they have this rotation value but i’m kind of stuck, probably using the wrong search terms on SO and Google.

  In the hope of making things clear I’ve actually added some ffmpeg libs to android following these steps, of course with some changes to parameters. I’m building this on a Mac and this all works fine now.
  http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9/

  Now the following, I have no real clue how these libs work and how to use them or which I actually need or if I even need them at all.

  Is there anyone who can point me in the right direction of solving my issue ? Basicly the video’s are on my android filesystem and I can access them fully, before uploading I want to check the values and remove and rotate the video’s if needed.

• Error using avisynth script as input to ffmpeg

  5 avril 2015, par ComputerVisioner

  I’ve searched the internet and haven’t found a solution. I hope this question does not come off as a duplicate.

  I have the following files in the same folder :

  • ffmpeg.exe (32-bit version)
  • IN.mp4 (video codec - AVC , audio codec - PCM)
  • RUN_FILE.bat and RUN_AVS.bat batch files
  • SCRIPT.avs (avisynth script file)
  • MSharpen.dll (sharpening filter for avisynth)

  The text within RUN_FILE.bat :

  ffmpeg -i "IN.mp4" -c:v libx264 -crf 24 -c:a libmp3lame -aq 2 OUT.mp4

  The text within RUN_AVS.bat :

  ffmpeg -i "SCRIPT.avs" -c:v libx264 -crf 24 -c:a libmp3lame -aq 2 OUT.mp4

  The text within SCRIPT.avs (3 lines) :

  LoadPlugin("D:\MSharpen.dll")
  
  
  
  DirectShowSource("D:\IN.MP4")
  
  
  
  MSharpen(15,150) 

  If I try loading the avisynth script with an external program such as media player classic it works fine (and sharpens the video frames).

  Going to the command line and running RUN_FILE.bat works as expected, however running RUN_AVS.bat I get the following error (see screenshot) :

  

  I find this confusing as ffmpeg is configured with --enable-avisynth.

  I’d appreciate help with this - This is part of a larger and very important project (automatically scanning a folder with hundreds of video files, sharpening and re-encoding them to another folder with the same filenames).

• Adjusting video length to fit audio length in FFmpeg

  8 avril 2015, par Spreadys

  This has been driving me mad !
  I have video.avi, a raw uncompressed video with a duration of 6mins
  I have audio.wav, a raw uncompressed audio with a duration of 9mins

  I need to mux these together, but map the timing information from the audio.
  Using Vsync 2 I would hope that video frames get duplicated in order to do this.

  My current (failed) attempt is

  ffmpeg -i video.avi -i audio.wav
   c:v rawvideo -c:a copy
   vsync 2 -map 0:0,1:0 -map 1:0,1:0
  newvideo.avi

  My understanding is that the -map first designates what file:stream, and this is followed by the file:stream to be used for timing information.

  I have attempted all my usual research methods in an attempt to avoid asking but it is still resulting in the avi container holding two streams with the video length unchanged.
  If anyone can shed some light on my errors, I would be very grateful....or if you need further info - please ask !

  Thanks
  David

  Any guidance on what other information may promote some suggestions to where i’m going wrong also appreciated.
  Thanks