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• vf_setdar : make config_props work properly when called multiple times.

  18 mars 2013, par Anton Khirnov

  vf_setdar : make config_props work properly when called multiple times.
  Do not overwrite the variable set through AVOptions.
  

  • [DH] libavfilter/vf_aspect.c

• ffmpeg scale logo size according to video size

  5 août 2017, par Teddybugs

  I have a ffmpeg command which is working fine to inject 2 image on the top left and bottom right of the video.

  ffmpeg -i ori.mp4 -y -i 1.png -i 2.png -filter_complex \
  
  "[0:v][1:v]overlay=20:20[bkg]; \
  
  [bkg][2:v]overlay=(main_w-overlay_w)-20:(main_h-overlay_h)-20" \
  
  -codec:v libx264 -crf 18 -preset slow -pix_fmt yuv420p \
  
  -c:a aac -strict -2 out1.mp4 

  this command working fine with video that has large size like 720x480, however when the input video size is 320x240 size, it will overlay half of the video size.

  1.png size is : 160x100

  2.png size is : 341x44

  any idea how to combine the scale2ref into above command ?

  been trying solution from this link so far no luck.

  update 1 : i found this command from here

  ffmpeg -i ori.mp4 -y -i 1.png \
  
  -filter_complex "[1:v][0:v]scale2ref=iw*0.25:-1[logo1][base]; \
  
  [base][logo1]overlay=20:20[v]" -map [v] -map 0:a \
  
  -codec:v libx264 -crf 18 -preset slow -pix_fmt yuv420p \
  
  -c:a aac -strict -2 out2.mp4 

  that command work fine to get one image to scale.

  update 2 :

  ffmpeg -i ori.mp4 -y -i 1.png -i 2.png \
  
  -filter_complex "[1:v][0:v]scale2ref=iw*0.25:-1[logo1][base];\
  
  [base][logo1]overlay=20:20[v];[2:v][0:v]scale2ref=iw*0.30:-1[logo2][base2];\
  
  [base2][logo2]overlay=(main_w-overlay_w)-20:(main_h-overlay_h)-20[v]" \
  
  -map [v] -map 0:a -codec:v libx264 -crf 18 -preset slow -pix_fmt yuv420p \
  
  -c:a aac -strict -2 out4.mp4 

  tried above, nothing work. got error like this

  Filter overlay has an unconnected output

  any help would be great

• ffmpeg works in command line but it doesn't work well in c#

  14 août 2016, par Ahmad Ali Mukashaty

  I want to stream movie via udp so I use this command line and it works well

  ffmpeg -re -i test.mkv -q 1 -vcodec libx264 -f mpegts udp://network:port

  but I want to run this command line using c# like this :

  process = new Process();        
  
  process.StartInfo.FileName = "cmd.exe";
  
  process.StartInfo.WorkingDirectory = @"c:\FFmpegTool\bin";
  
  process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
  
  process.StartInfo.Arguments = "/C ffmpeg.exe";
  
  process.Start();
  
  
  
  process.StartInfo.FileName = "ffmpeg";
  
  process.StartInfo.Arguments = "-re -i test.mkv -q 1 -vcodec libx264 -f mpegts udp://network:port";
  
  process.Start();

  it works but I can’t receive the stream

  why this commnand doesn’t work well when I use it in c# and what’s the different bettwen ranning command in cmd directly or using process class in c#