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• How can low frame rate video be made to look more smooth ?

  14 décembre 2016, par d3pd

  I am trying to clean up a video that was recorded in 2003 in low-light conditions on what was possibly a cameraphone. The video has been cleaned up somewhat (cropped, logos removed and stabilized), but it remains quite jerky, due in large part to its low frame rate. What are some tricks that might clean up the video in this regard ? I feel that I am asking for something a bit like tweening in flash animations, but for pixels, whereby additional frames are generated using nearby frames of the video. Does such a trick exist ? Is there another way to approach this problem ?

  To reproduce the video processing so far, take the following steps :

  # get video
  
  wget http://www.anwarweb.net/saddamdown.wmv
  
  # crop
  
  ffmpeg -i saddamdown.wmv -filter:v "crop=292:221:14:10" -c:a copy saddamdown_crop.wmv
  
  # remove logo 1
  
  ffmpeg -i saddamdown_crop.wmv -vf delogo=x=17:y=77:w=8:h=54 -c:a copy saddamdown_crop_delogo_1.wmv
  
  # remove logo 2
  
  ffmpeg -i saddamdown_crop_delogo_1.wmv -vf delogo=x=190:y=174:w=54:h=8 -c:a copy saddamdown_crop_delogo_1_delogo_2.wmv
  
  # stabilize
  
  ffmpeg -i saddamdown_crop_delogo_1_delogo_2.wmv -vf deshake saddamdown_crop_delogo_1_delogo_2_deshake.wmv

  Note : The video is of the Saddam Hussein execution.

• ffplay v3.4.1 : Could not initialize SDL - No available video device

  21 juin 2021, par iorih0304

  My linux distribution is Ubuntu 20.04 server, and ffplay is compiled from ffmpeg v3.4.1 source code.

  


  I use the command

  


  ffplay -f rawvideo -video_size 1920x1080 -i BasketballDrive_1920x1080_50.yuv


  


  or

  


  Display=:0 ffplay -f rawvideo -video_size 1920x1080 -i BasketballDrive_1920x1080_50.yuv


  


  But it displays failed, the message shows :

  


  ffplay version 3.4.1 Copyright (c) 2003-2017 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-17ubuntu1~20.04)
  configuration: --enable-shared --enable-nonfree --enable-ffplay
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100

Could not initialize SDL - No available video device
(Did you set the DISPLAY variable?)


  


  Follow some website's suggestions, I try to install apt-get install libx11-dev xorg-dev, compile and install SDL2-2.0.14 from source code and recompile ffmpeg and ffplay.
But the result is the same.

  


  How can I let it display successfully ?

  


  Thanks !

  


• configure : require pkg-config for libvorbis

  4 juillet 2017, par Ricardo Constantino

  configure : require pkg-config for libvorbis
  libvorbis comes with pkg-config files since at least v1.0.1, way back in 2003.
  We need the two checks for vorbis and vorbisenc because we use functions from
  
  both and Xiph considers them separate libraries.
  The check is inverted (vorbis first then vorbisenc) because add_extralibs()
  
  prepends to EXTRALIBS instead of appending. For both shared and static linking
  
  the order didn't seem to matter anyway, testing with MinGW.
  Signed-off-by : Derek Buitenhuis <derek.buitenhuis@gmail.com>
  

  • [DH] configure