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• video orientation detection in bash

  30 décembre 2020, par Miati

  I need to detect whether videos are recorded in portrait or landscape mode, then transpose those into the correct orientation, in a scripted fashion.

  



  if [ "$v_orient" ==  "landscape" ]
  then
    ffmpeg -i file.mp4 -vf "transpose=1" file.ogv
  else 
    ffmpeg -i file.mp4 file.ogv
fi


  



  I've looked in ffmpeg online documentation and googled around,

  



  I've attempted exiftool

  



  exiftool -Rotation -Rotate file.mp4


  



  However, this outputs Rotate : 90 for both landscape & portrait videos I have.

  



  ---

  



  How can I detect the video orientation in bash ?

  


• ffmpeg encoding outputs a file with incorrect metadata

  20 juillet 2013, par user2554615

  I use ffmpeg to convert a flv file to an mp3 file like so in bash :

  ffmpeg -i path/to/file.flv path/to/output.mp3

  say the flv is 5 minutes long, the output file is supposedly say, 3 minutes long. however when played back it will reach the 3 minute mark and keep playing (as it should) the full length. when i try to skip to a portion of the song it only skips by fractions of the time it should, take for example if the video is labeled as 3 minutes long and i skip to the end, it will actually be playing the area that is about 30 seconds in. why is it doing this and how do i fix it ? is there any other utility that i can use that will effectively convert .flv and .mp4 files to .mp3 or .wav in a loss-less fashion while maintaining the correct metadata, preferably for windows ? perhaps an API i can use in java or c++ ?

  PS : i ask here because it relates to a command line utility and i assume that the the solution will relate to the options used in the command.

  PPS : i am using the ffmpeg that comes with puppy linux (precise) 5.4

• Rendering video streaming in android

  16 avril 2013, par user1568549

  I've successfully cross-compiled a c++ streaming library to the ICS platform

  This library contains a sample player that uses sdl library to render the resulting decoded streams and libav for decoding that i've also succeeded to cross compile(libav ... classes) .Then, i 've made the necessary jni classes and tested it log tags it seems that everything is fine but now i want to show the result on the screen(show the real streaming not just log messages)

  I am searching for the easiest way to render my video-stream (just to be sure that everything works fine)

  Am i obliged to cross-compile the SDL library too ? Is it possible ? If yes is there any good tutorial ?

  Is there any other solution to render directly FFmpeg decoded frames ?