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• Revision 32970 : On progresse doucement mais surement.

  15 novembre 2009, par vxl@… — Log

  On progresse doucement mais surement.

• How to get the width of video files stored in aws s3 using django ?

  15 novembre 2020, par Anshul Singh

  I tried the python subprocess module to run FFmpeg commands but apart from two images stored in the s3 bucket, it is giving me an error : No such file or directory in spite of the fact that the video files are present in the same directory as the image.

  


  import subprocess
from storages.backends.s3boto3 import S3Boto3Storage

s3 = S3Boto3Storage()
f = s3.open('path/to/file','r')
cmnd = ['ffprobe','-v','error','-of','flat=s=_ ','-select_streams','v:0','-show_entries','stream=width','-pretty', '-loglevel', 'quiet', file.name]
p = subprocess.Popen(cmnd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err =  p.communicate()
print(out)


  


  Output :

  


  


  b''

  


  


  print(err)


  


  Output :

  


  


  b'ffmpeg version N-54874-ga1553b0cfb-static https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2020 the FFmpeg developers\n built with gcc 8 (Debian 8.3.0-6)\n configuration : —enable-gpl —enable-version3 —enable-static —disable-debug —disable-ffplay —disable-indev=sndio —disable-outdev=sndio —cc=gcc —enable-fontconfig —enable-frei0r —enable-gnutls —enable-gmp —enable-libgme —enable-gray —enable-libfribidi —enable-libass —enable-libfreetype —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-librubberband —enable-libsoxr —enable-libspeex —enable-libsrt —enable-libvorbis —enable-libopus —enable-libtheora —enable-libvidstab —enable-libvo-amrwbenc —enable-libvpx —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxml2 —enable-libxvid —enable-libzimg\n libavutil ......... "path/to/file" : No such file or directory\n'

  


  


  I performed this by sshing into my ec2 instance and opening the python shell there. I don't understand what's wrong. I thought maybe size was an issue. So I uploaded a small size image to the s3 bucket but the same thing happened.

  


• How to extract orientation information from videos ?

  23 décembre 2016, par Sid

  After surfing through tons of documentation on the web it seems that the iPhone always shoots the video at a 480x360 aspect ratio and applies a transformation matrix on the video track. (480x360 may change but its always the same for a given device)

  Here is a way of modifying the ffmpeg source within a iOS project and accessing the matrix http://www.seqoy.com/correct-orientation-for-iphone-recorded-movies-with-ffmpeg/

  Here is a cleaner way of finding the transformation matrix in iOS-4
  how to detect (iphone sdk) if a video file was recorded in portrait orientation, or landscape

  How can the orientation of the video be extracted in either of the options below -
  
   iOS 3.2
  
   ffmpeg (through the command line server side)
  
   ruby
  

  Any help will be appreciated.