Recherche avancée

Sur d’autres sites (16803)

• Using FFMPEG command to read the frame and show using the inshow function in opencv

  28 novembre 2024, par HARSH BHATNAGAR

  I am trying to get the frame using the ffmpeg command and show using the opencv function cv2.imshow(). This snippet gives the black and white image on the RTSP Stream link . Output is given below link [ output of FFmpeg link].
I have tried the ffplay command but it gives the direct image . i am not able to access the frame or apply the image processing.

  


  Output of FFMPEG

  


  import cv2
import subprocess as sp
command = [ 'C:/ffmpeg/ffmpeg.exe',
            '-i', 'rtsp://192.168.1.12/media/video2',
            '-f', 'image2pipe',
            '-pix_fmt', 'rgb24',
            '-vcodec', 'rawvideo', '-']


import numpy
pipe = sp.Popen(command, stdout = sp.PIPE, bufsize=10**8)
while True:
    raw_image = pipe.stdout.read(420*360*3)
   # transform the byte read into a numpy array
    image =  numpy.fromstring(raw_image, dtype='uint8')
    image = image.reshape((360,420,3))
    cv2.imshow('hello',image)
    cv2.waitKey(1)
    # throw away the data in the pipe's buffer.
    pipe.stdout.flush()


  


• ffmpeg - make video for online web players (flowplayer, jw player) [on hold]

  7 janvier 2016, par Ba Ta

  Im restreaming a link in ffmpeg using this command line

  -vcodec copy -c:a libmp3lame -ab 48k -ar 22050

  so if i play in flowplayer (web PLayer) i just listen audio perfect and video has problems "so i just see images insteand of video" its very slow and it blocks

  When i play same video link on pc on vlc player its working perfect and in video codec i see

    H264 - MPEG-4 AVC (avc1)     MPEG Audyo layer 3 (mp3)

  so how to convert this stream so i can watch on web players like flowplayer or jw player

• Android : mp4 file plays when downloaded but when choosing "Video" player gets "Cannot play video"

  14 janvier 2014, par gview

  I've converted the video to an mp4 with ffmpeg using the h264 codec and AAC, and used the baseline profile.

  Videos are 540x360x250kbps

  I then ran qt-faststart on the file to move the atoms into the right order.

  I've stuck the file up on a wiki we use and created a link to it.

  My test phone is a Samsung Galaxy S3.

  When I browse to the page that has links to the mp4's on it, and I click on them, I get a popup window with 2 options : Internet and Video.

  If I download the videos using the "Internet" option, I can play them on the phone without issue.

  I've done other encodings with the main profile as well, and these also play fine. I thought that a powerful phone like the s3 would be able to handle the more advanced compression schemes available in h264, however I've also browsed the Android docs in regards to supported video formats, and it seems to state that only the "baseline" compression profile is supported.

  Regardless, what doesn't work is trying to use the "Video" option which I assume tries to stream the video.

  For the wiki in question, clicking on the link reveals that the content-type and content-length headers are being set :

  Content-Length  6175996
  
  Content-Type    video/mp4;charset=UTF-8

  Clicking on the link with a browser invokes a player (Quicktime in most cases) that can play the mp4's.

  Is there more to having the file HTTP streamable beyond making a link to it ? Why won't my Android 4 play these files ?

  UPDATE :
  I decided to make a quick HTML5 page using the video tag, and the videos do play on both my Galaxy S3 and the latest IOS.