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• Unable to get current time in TCL. can i use flush here ?

  30 novembre 2017, par M. D. P

  unable to get current time for the bellow code :

  proc a {} { 
  
  
  
          for {set i 0} {$i < 3} {incr i} {
  
      puts " $i "
  
  
  
  
  
                  set imagetime [clock format [clock seconds] -format %Y%m%d_%H%M%S]
  
                  set videotime [clock format [clock seconds] -format %Y%m%d_%H%M%S]
  
       
  
                  exec ffmpeg -f dshow -i "video=Integrated Webcam" -s 1280x720 -benchmark c:/test/Image_$imagetime.jpg >& c:/test/image_$imagetime.txt &
  
  
  
                  after 15000
  
  
  
                  exec ffmpeg -f dshow -t 00:00:10 -i "video=Integrated Webcam" -s 1280x720 -benchmark c:/test/video_$videotime.avi >& c:/test/video_$videotime.txt &
  
                  
  
                  after 15000
  
          } 
  
  }
  
  a

  the output is :

  

  the problem here is, even though the variable for taking video time and image time is different, it is tacking same time for video and image.

  any reason or solution for this ????

  can i use flush command ???

  can i work with following code :

  proc a {} { 
  
  
  
          for {set i 0} {$i < 3} {incr i} {
  
      puts " $i "
  
  
  
  set time [clock format [clock seconds] -format %Y%m%d_%H%M%S]
  
                       
  
                  exec ffmpeg -f dshow -i "video=Integrated Webcam" -s 1280x720 -benchmark c:/test/Image_$time.jpg >& c:/test/image_$time.txt &
  
  
  
                  after 15000
  
  
  
                  exec ffmpeg -f dshow -t 00:00:10 -i "video=Integrated Webcam" -s 1280x720 -benchmark c:/test/video_$time.avi >& c:/test/video_$time.txt &
  
                  
  
                  after 15000
  
          } 
  
  }
  
  a

  any answer ??

• FFMPEG : embed current time in milliseconds into video [closed]

  5 juin, par stevendesu

  I would like to embed the computer's local time in milliseconds into a stream using FFMPEG.

  



  I can embed the local time in seconds using drawtext like so :

  



  ffmpeg -i <input /> -vf "drawtext=text=&#x27;%{localtime\:%T}&#x27;" -f flv <output>&#xA;</output>

  



  Looking through the documentation for drawtext, doing some tests, and Googling around, it seems like localtime and gmtime don't provide milliseconds — just seconds. However the pts options does have milliseconds :

  



  ffmpeg -i <input /> -vf "drawtext=text=&#x27;%{pts\:hms}&#x27;" -f flv <output>&#xA;</output>

  



  I also found out that pts supports an offset, so I was able to use something like this to display local time (kind of) :

  



  ffmpeg -i <input /> -vf "drawtext=text=&#x27;%{pts\:hms\:$(date &#x2B;%s.%N)}&#x27;" -f flv <output>&#xA;</output>

  



  This had two problems :

  



  

  1. It displayed something like 17499:17:29 for the time... I found a (rather complex) way to work around this

  


  2. It uses the server's current time when you first run the ffmpeg command as the offset — not the server's current time when ffmpeg actually starts decoding video. I noticed ffmpeg had about a 2-second startup time, causing the clock to be off by roughly 2 seconds

  


  



  Is there a way to modify my solution, or an entirely separate solution, that can embed server local time in milliseconds into the stream ?

  


• How to modify x264 source code to get motion search time [closed]

  21 octobre 2017, par Yicheng Li

  I am a new member of stack overflow, I hope you guys can help me solve this problem.
  I am now using x264 with ffmpeg to encode some raw video, I was asked how much time the motion search would cost in libx264 video coding. Therefore, I need to modify the code, I tried put the clock around the switch sentence in the encoder/me.c
  clock start

  clock end
  After compiling the source code and run a test,
  it shows that the time is very small and it seems I am actually getting the time each macro block spent on motion search.

  So, how should I modify the x264 source code to get the time duration in motion search.

  Big Thanks.