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• Error while processing h.264 rtsp stream in opencv

  4 février 2016, par satinder

  My opencv code is perfectly open any video file and decently play it . But when I open the rtsp h.264 video stream then there have **following errors messages :

  Last message repeated 1 times
  
  [h264 @ 0x3a43420] decode_slice_header error
  
  [h264 @ 0x3a43420] no frame!
  
  [h264 @ 0x3a43420] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x3a43420] decode_slice_header error
  
  [h264 @ 0x3a43420] no frame!
  
  [h264 @ 0x3a43420] non-existing PPS 0 referenced**

  after 2-3 mins video is playing in opencv.

  But we know opencv use ffmpeg library for decode frame . So , I have an idea and I play that network rtsp stream with ffplay . Then ffplay decently play that stream after 2-3 message approx within 5 secs . So how I can solve opencv problem . Please anybody help for that.

• reading lines from txt file into .csv

  7 janvier 2014, par Dynamite Media

  i have a .TXT file i created via batch file using ffmpeg. it returns the following info ( more but trying to make short)

  major_brand=isom 
  
  minor_version=512 
  
  compatible_brands=isomiso2avc1mp41 
  
  creation_time=1970-01-01 00:00:00 
  
  encoder=Lavf53.19.0 
  
  genre=sport 
  
  track=1 
  
  title=IRWX_TV_Vol_01_1_Pt_4 
  
  episode_id=0101 

  the .TXT file comes back with 3 of these above. well i want to be able to only use some of the info above and then i want to create a .CSV file so that i can load into .XLS file

  I have used the following and it's close :

  REM now lets get info we need from result.txt
  
  pause 
  
  
  
  REM checks how many times finds genre and loops that many times
  
  FOR /f "delims=" %%b IN ('findstr "genre" result.txt') DO (
  
  for %%f in (result.txt) do (
  
      set i=0
  
  
  
  for /F "delims= tokens=2,3*" %%l in (%%f) do (
  
      set /A i+=1
  
      set line!i!=%%l
  
  
  
  )
  
  echo  !line9!, !line6!, !line8!,  >> result.csv
  
  )
  
  ) 
  
  pause 

  and this is coming back with the following :

   title=IRWX_TV_Vol_01_1_Pt_4 , genre=sport, episode_id=0101
  
   title=IRWX_TV_Vol_01_1_Pt_4 , genre=sport, episode_id=0101
  
   title=IRWX_TV_Vol_01_1_Pt_4 , genre=sport, episode_id=0101

  ONLY the 1st video title from .TXT file and not each of them

  AND i would prefer it to come back like this :

   IRWX_TV_Vol_01_1_Pt_4,sport,0101

  Minus the variables, the "=" and the space issues you see above.

  i have been going over and over this trying different things and it is just not working.

  Hopefully someone here can see the issue and help out, Thanks

• FFMpeg overlay and fade images and text in and out at over video background

  28 décembre 2019, par grootester

  Prior to applying the drawbox and drawtext text option I was able to fade in and out images easily. However, attempting to incorporate the drawtext produces unwanted errors. Any ideas how this could be rememdied ? Love to show multi-line text (different fonts) centered over box at specific times with fade in fade out times that works alongside images fading in out at specific times.

  ffmpeg -i vids/testVid.mp4 -loop 1 -i slideshow/pic1.png -loop 1 -i slideshow/pic2.png -loop 1 -i slideshow/pic3.png -i slideshow/pic4.png -filter_complex "[0:v]drawbox=x=40:y=40:w=250:h=75:color=white,drawtext=fontfile=arialb.ttf:fontsize=24:font color=black:text=Micky Mouse,drawtext=fontfile=arial.ttf:fontsize=24 : font color=black:text=January 1st 1938 — December 19th 2019fade=st=0:d=1:alpha=1,fade=out:st=5:d=1:alpha=1,trim=0:6,setpts=PTS+4/TB[ovr1] ; [2]fade=st=0:d=1:alpha=1,fade=out:st=5:d=1:alpha=1,trim=0:6,setpts=PTS+10/TB[ovr2] ; [3]fade=st=0:d=1:alpha=1,fade=out:st=5:d=1:alpha=1,trim=0:6,setpts=PTS+16/TB[ovr3] ; [4]fade=st=0:d=1:alpha=1,fade=out:st=5:d=1:alpha=1,trim=0:6,setpts=PTS+22/TB[ovr4] ; [0:v][ovr1]overlay=(main_w-overlay_w)/2 :(main_h-overlay_h)/2:enable=’between(t,4,10)’[base1] ; [base1][ovr2]overlay=(main_w-overlay_w)/2 :(main_h-overlay_h)/2:enable=’between(t,10,16)’[base2] ; [base2][ovr3]overlay=(main_w-overlay_w)/2 :(main_h-overlay_h)/2:enable=’between(t,16,22)’[base3] ; [base3][ovr4]overlay=(main_w-overlay_w)/2 :(main_h-overlay_h)/2:enable=’between(t,22,28)’[out]" -map "[out]" -c:v libx264 -c:a copy -flags +global_header -crf 27 -preset veryfast -s 1920x1080 -y slideshow/outTest.mp4