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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

• How to create a video from images on a .tif format with FFmpeg ?

  18 décembre 2018, par ecjb

  I just discovered FFmpeg : awesome software. After reading this this stackoverflow question I could efficiently create a movie with pictures in a .png format with the following line :

  ffmpeg -r 1/5 -i img%03d.png -c:v libx264 -vf "fps=25,format=yuv420p" out.mp4

  In an experiment, however, I took high quality pictures on a .tif format and would like to create a movie out of them. I just copied the line above and replaced the name of the files as well as the format .png by .tif but I got a message error saying "This format is not supported". Here is the report :

  [tiff @ 0x7fce5c02a600] This format is not supported (bpp=12, bppcount=1)
  
  Last message repeated 1 times
  
  Error while decoding stream #0:0: Invalid data found when processing input
  
  [tiff @ 0x7fce5c01bc00] This format is not supported (bpp=12, bppcount=1)
  
  Last message repeated 7 times
  
  Cannot determine format of input stream 0:0 after EOF
  
  Error marking filters as finished
  
  Conversion failed!

  Should I just forget it or is there a workaround with ffmpeg ?