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• How to compare the difference between 2 videos color in ffmpeg ?

  3 décembre 2014, par nico_lab

  I have read How to compare/show the difference between 2 videos in ffmpeg ? , but "blend=all_mode=difference" is green.
  How do I get more colorful diffrence using blend filter ?

  sample command is

  ffplay -f lavfi "movie=left.mp4,split[a1][a2]; movie=right.mp4,split[b1][b2]; [a1][b1]blend=all_mode=difference[blend];[a2]pad=2*iw:2*ih[left];[left][b2]overlay=w[tmp];[tmp][blend]overlay=0:h"

  using "hue=s=0", color is chenge monochrome.

  ffplay -f lavfi "movie=left.mp4,split[a1][a2]; movie=right.mp4,split[b1][b2]; [a1][b1]blend=all_mode=difference,hue=s=0[blend];[a2]pad=2*iw:2*ih[left];[left][b2]overlay=w[tmp];[tmp][blend]overlay=0:h"

  The goal is this video. if you have a niconico account.
  http://www.nicovideo.jp/watch/sm24864058

  if you don’t have a niconico account, embed page is
  http://www.nicozon.net/watch/sm24864058

• Webcam - Publishing and Archiving on line video files

  11 novembre 2014, par Emmanuel Brunet

  I want to publish an ASF live video stream over the internet and also copy the backup to disk (without sound to spare disk space)

  I’m running debian 7.7 wheezy / ffmpeg 2.2 and ffserver 1.2.9.

  ---

  The IP camera video streams specifications are

  Input #0, asf, from 'http://account:password@webcam/videostream.asf':
  
    Duration: N/A, start: 0.000000, bitrate: 32 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc), 640x480, 50 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: adpcm_ima_wav ([17][0][0][0] / 0x0011), 8000 Hz, 1 channels, s16p, 32 kb/s

  To achieve this I have set up a /etc/ffserver.conf configuration

  Port 11000
  
  
  
  BindAddress 0.0.0.0
  
  
  
  MaxClients 1000
  
  
  
  MaxBandwidth 40000
  
  
  
  CustomLog -
  
  
  
  <feed>
  
  File /tmp/feed1.ffm
  
  FileMaxSize 200K
  
  ACL allow localhost
  
  ACL allow 192.168.1.1 192.168.255.255
  
  
  
  </feed>
  
  
  
  
  
  # --------------------------- ASF ----------------------
  
  
  
  <stream>
  
  Feed feed1.ffm
  
  Format asf
  
  
  
  AVOptionVideo flags +global_header
  
  VideoFrameRate 25
  
  VideoSize 640x480
  
  VideoBitRate 1024
  
  VideoBufferSize 1024
  
  StartSendOnKey
  
  NoAudio
  
  </stream>
  
  
  
  # ------------ Server status -------------------
  
  
  
  <stream>
  
  Format status
  
  
  
  # Only allow local people to get the status
  
  ACL allow localhost
  
  ACL allow 192.168.0.0 192.168.255.255
  
  
  
  #FaviconURL http://pond1.gladstonefamily.net:8080/favicon.ico
  
  </stream>
  
  
  
  
  
  # ---------- Redirect --------------------
  
  
  
  <redirect>
  
  URL http://www.ffmpeg.org/
  
  </redirect>

  To connect the feed I run

  to start the ffserver

  ffserver -f /etc/ffserver.conf

  to collect the stream from the camera

  ffmpeg -i http://account:password@webcam/videostream.asf -c:v libx264 -an http://localhost:11000/feed1.ffm

  and all works like a charm.

  ---

  My questions are :

  • How in the same time having the stream saved to disk ?

  (as done by the command)

  ffmpeg -i http://account:password@webcam/videostream.asf -preset veryfast -t 00:60:00 -b:v 512K -c:v libx264 -pix_fmt yuv420p -an /var/backup/videos/YYY-MM-DD.mp4

  Note that the output .mp4 file names should rotate to get multiple timestamped output archives

  • How can I published video over RTSP ?

  I’ve found examples on the internet but none worked for me

  Thanks in advance

  regards

• DVD m2v to mp4, Anamorphic to Square Pixels, 640x480 or 720x540 ?

  10 juillet 2018, par Matt McManis

  I want to use FFmpeg to convert an NTSC DVD .m2v file to an .mp4.

  The original resolution is 720x480 4:3 Anamorphic.

  I want to convert for playback on a computer using a player like VLC, with Square Pixels.

  ---

  To preserve the best quality

  Should I convert stretching the height 720x540 ?

  Or shrink the width 640x480 ?

  Or should I leave it Anamorphic 720x480 ?

  ---

  What is the difference between playing Anamorphic and Square Pixels on a computer monitor ?

  Does the media player always stretch the pixels to display correctly if Anamorphic ?

  Does encoding the height stretch from 480 to 540 by FFmpeg improve anything ?

  ---

  FFmpeg

  ffmpeg
  
  
  
  -framerate ntsc 
  
  
  
  -i input.m2v 
  
  
  
  -c:v libx264 
  
  -preset medium -crf 18 
  
  -pix_fmt yuv420p 
  
  
  
  -s 720x540 
  
  -aspect 4:3 
  
  
  
  -vf "fps=24000/1001" 
  
  
  
  output.mp4