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• Solution to convert FLV to MP4 from streaming server [on hold]

  10 avril 2015, par user3799647

  I am looking for solution to convert FLV video file from streaming server like Vidzer, to HTML5 friendly format like mp4. I have small website with movies and I want to watch movies on my phone which support MP4.

  Is there any way to do that ? I have dedicated server, I don’t want to save files on server and convert, but convert on the fly using cURL, PHP and ffmpeg.

• ffmpeg exec hangs in windows even after redirection

  4 juin 2020, par Yashwanth Dornala

  iam using ffmpeg for php ..even after redirecting stdout the script still hangs.help.

  



  <?php

exec("youtube-dl -g https://www.youtube.com/watch?v=3Ywz4qvMfpQ 2>&1",$a);
echo $a[1];

exec(" ffmpeg -y -ss 1:30 -i \"$a[0]\" -ss 42:30 -i \"$a[1]\" -map 0:v -map 1:a -ss 10 -t 0:20 -c:v libx264 -c:a aac gog-vs-triv.mp4 > NUL 2>&1 "); 


?>


  



  ps :The above code runs good on cmd.

  


• Rolling screen capture with ffmpeg on windows

  11 décembre 2020, par gap210

  I have the following code to capture a video stream from my webcam. I use ffmpeg to write to named windows pipe, then read it with python and display with opencv. The thing is that the opencv stream is 'rolling' as shown here https://www.youtube.com/watch?v=H78TRo3DZIo

  


  If I capture the output to a video instead of a pipe, with the command :

  


  ffmpeg -f dshow -video_size 1920x1080 -framerate 60 -i video="USB Video" -c:v copy out.avi

  


  everything looks fine. What should I change to achieve the desired effect ? (non-rolling stream)

  


  My code below :

  


  import cv2
import time
import subprocess
import numpy as np

w, h = 800, 600

# Get frame generator
gen = ffmpegGrab()

# Get start time
start = time.time()

# Read video frames from ffmpeg in loop
nFrames = 0
cmd = 'C:/Users/......./Downloads/ffmpeg-4.3.1-2020-11-19-full_build/bin/ffmpeg.exe -f dshow -framerate 60 -video_size 800x600 -i video="USB Video" -pix_fmt bgr24 -vcodec rawvideo -f image2pipe -'

proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True, bufsize=10**9)
while True:
    # Read next frame from ffmpeg

    frame = proc.stdout.read(w * h * 3)
    frame = np.frombuffer(frame, dtype=np.uint8).reshape((h, w, 3))
    cv2.imshow('screenshot', frame)

    if cv2.waitKey(1) == ord("q"):
        break

    fps = nFrames / (time.time() - start)
    print(f'FPS: {fps}')

cv2.destroyAllWindows()