Recherche avancée

Sur d’autres sites (9568)

• Diagonal Split using ffmpeg

  8 juillet 2017, par Jeffin

  I am trying to acheive the following effect using ffmpeg

  

  I have tried multiple options , but failed so far,

  I have referred the following questions , not happening for me

  • FFmpeg : Add alpha channel to a video using a PNG mask
  • FFMPEG Crop with side by side merge
  • https://superuser.com/questions/916431/ffmpeg-filter-to-boxblur-and-greyscale-a-video-using-alpha-mask?rq=1

  I have three videos but i have somewhat acheived the diagonal split for two videos using the following code , but still couldnt get the output for three videos or four

  ffmpeg -i input0 -i input1 -filter_complex \
  
  "[1:v][0:v]blend=all_expr=if(gt(X\,Y*(W/H))\,A\,B)" output

• FFmpeg - Rotating at angle

  23 septembre 2017, par connor

  I’ve been working through FFmpeg, but I have been unable to get a rotation to run from the examples they have on their site. I am trying to "wiggle" a video back and forth at a fixed point on the bottom - think a head moving left to right (and so on).

  I am attempting to do this with the filter "rotate" (https://ffmpeg.org/ffmpeg-filters.html#rotate). Attempting to use their examples, I get an error.

  This is what I have so far :

  ffmpeg -i vid1.mp4 -i vid2.mov -loop 1 -i image.png -filter_complex "\
  
      [2:v]alphaextract, scale=240x160[mask];\
  
      [0:v] scale=240x160, rotate=A*sin(2*PI/T*t) [ascaled];\
  
      [ascaled][mask]alphamerge[masked];\
  
      [1:v]scale=480x360[background];\
  
      [background][masked]overlay=120:20"\
  
      -c:a copy 65B6354F61B4AF02_HD_sq.MOV

  I am using "rotate" directly from an example in an attempt to get something to run at all.

  The error I get back is :

  [Parsed_rotate_3 @ 0x7ff4476045e0] [Eval @ 0x7fff5b3e3f00] Undefined constant or missing '(' in 'T*t)'
  
  [Parsed_rotate_3 @ 0x7ff4476045e0] Error occurred parsing angle expression 'A*sin(2*PI/T*t)'
  
  [Parsed_rotate_3 @ 0x7ff4476045e0] Failed to configure output pad on Parsed_rotate_3
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #1:0

  If I remove ’A’, ’T’, ’sin’, etc, rotate does actually work, but far from the desired behavior.

  Am I missing something to expose those params ?

• Restreaming raw data to ffserver gives rc buffer overflow error

  19 octobre 2017, par Nithish Reddy J

  My goal here is to fetch stream from live url to opencv python, process this stream and restream it to ffserver. Below is the command i use :

  python store.py | ffmpeg -f rawvideo -pixel_format yuv420p -video_size
  544x576 -framerate 25 -i - http://localhost:8090/feed1.ffm

  Below is my ffserver.conf file

  <feed>
  
  
  
  File /tmp/feed1.ffm
  
  FileMaxSize 3G
  
  ACL allow 127.0.0.1
  
  
  
  </feed>
  
  
  
  <stream>
  
  Format mpeg
  
  VideoBitRate 128
  
  VideoBufferSize 60000
  
  VideoFrameRate 25
  
  VideoSize 544x576
  
  VideoGopSize 12
  
  NoAudio
  
  VideoQMax 45
  
  ACL allow localhost
  
  ACL allow 192.168.0.0 192.168.255.255
  
  
  
  </stream>

  and when i run the command stated above it gives me the error

  [mpeg1video @ 0x1c6e6c0] rc buffer underflow

  and to test my feed when i hit the command

  ffplay http://localhost:8090/test1.mpg

  I can see the output feed being played but there is a green mask applied on the feed.Attaching Image :