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• Method describe failed : 404 Client error in python

  13 février 2020, par ygHong

  import cv2
  cap = cv2.VideoCapture('rtsp://192.168.0.17:7779',cv2.CAP_FFMPEG)
  ret, frame = cap.read()
  
  while ret:
      frame = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
      cv2.imshow('frame', frame)
      # do other processing on frame...
  
  
  
      ret, frame = cap.read()
      if (cv2.waitKey(1) & 0xFF == ord('q')):
          break
  
  cap.release()
  cv2.destroyAllWindows()
  

  VLC failed to read the movie streaming.

  Terminates without any errors.

  But in jupyternotebook Promt says 'method DESCRIBE failed: 404 Client error'

• FFmpeg : concat multiple videos, some with audio, some without

  13 février 2020, par Tommy Adeniyi

  I'm trying to concatenate 5 videos where the first and last have no audio track. I have tried the following command:

      ffmpeg -i 1-copyright/copyright2018640x480.mp4 -i 2-openingtitle/EOTIntroFINAL640x480.mp4 -i 3-videos/yelling.mp4 -i 4-endtitle/EOTOutroFINAL640x480.mp4 -i 5-learnabout/Niambi640.mp4 -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] [3:v:0] [3:a:0] [4:v:0] [4:a:0] concat=n=5:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" output_video.mp4
  

  and I get the output error:

      Stream specifier ':a:0' in filtergraph description [0:v:0] [0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] [3:v:0] [3:a:0] [4:v:0] [4:a:0] concat=n=5:v=1:a=1 [v] [a] matches no streams.
  

  I know the first and last videos have no audio but I dont know how to write the statement to ignore the audio track in those videos. I have tried removing the [0:a:0] but that just throws another error:

     Stream specifier ':v:0' in filtergraph description [0:v:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] [3:v:0] [3:a:0] [4:v:0] [4:a:0] concat=n=5:v=1:a=1 [v] [a] matches no streams.
  

  It doesnt make sense and Im kinda lost.

• Real Time Audio Effects and Reverb [closed]

  13 février 2020, par Muhammad Haroon

  Hi i got stuck in applying real time audio effect while recording audio is there any native way to apply reverb on audio.please suggest what is best way to achieve this as i am already using tarsosdsp for pitch detection.

• Removing file in windows batch script not working

  13 février 2020, par BluePrint

  I'm trying to create a batch script for trimming 25 seconds from the beginning of all mp4 files in a folder. The batch script is located in the same folder as the files, and there is a folder called trimmed in the same folder. This is my script so far:

  @echo off
  setlocal DisableDelayedExpansion
  
  :promptdel
  set /p delorig=Delete original file (default no)? [Y/N]: 
  
  if not defined delorig (
    set delorig=N
  )
  
  set "vartwo="&for /f "delims=YNyn" %%i in ("%delorig%") do set vartwo=%%i
  
  if defined vartwo (
    echo Please state Y or N!
    goto :promptdel
  )
  
  for %%a in ("*.mp4") do (
    echo Starting %%a
  
    rem "Need to rename since file names may contain whitespaces"
    ren "%%a" "working.mp4"
    ffmpeg -loglevel panic -hide_banner -i "working.mp4" -ss 00:00:25.000 -c:v copy -c:a copy "trimmed\%%a"
    ren "working.mp4" "%%a"
  
    echo %delorig%
    if %delorig% == "Y" (del "%%a" /f /q)
    if %delorig% == "y" (del "%%a" /f /q)
  
    echo %%a finished!
  )
  
  pause
  

  My problem is that the original file does not get removed regardless of if I input y/Y or n/N. What am I doing wrong?

• How to set ffmpeg command line option in FFmpeg.AutoGen

  13 février 2020, par Yurii Zhukow

  I am trying to read/decode RTSP stream from my ip camera using FFmpeg.AutoGen lib. The server responds with error when ffmpeg tries to connect via UDP. The same thing happens when i try to connect via ffmpeg exe:

  ffmpeg -i rtsp:// -vcodec h264 c:\out.mp4

  But when use -rtsp_transport tcp every thing works fine:

  ffmpeg -rtsp_transport tcp -i rtsp:// -vcodec h264 c:\out.mp4

  Can anyone suggest how to enable such options (in general, or in particular -rtsp_transport tcp option) in FFmpeg.AutoGen?