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• Streaming HLS with Nginx & FFMPEG : How to prevent repeating or skipping scenes (.ts) when playback ?

  31 août 2022, par Fugen

  I set up HLS streaming server using Nginx & FFMPEG, then i watch it using vlc or ffplay on another pc. The problem is sometimes it repeating scenes or skipping scenes for few seconds then it continue like normal, it happens at random but occurs occasionally and not always on the same spots.
  

  


  Here is sample of ffplay log :

  


  [http @ 000002c6e2611c00] Opening 'http://172.20.120.75:8080/hls/test-3.ts' for reading
[hls @ 000002c6e260bcc0] Skip ('#EXT-X-VERSION:3')sq=    0B f=0/0
[hls @ 000002c6e260bcc0] Skip ('#EXT-X-DISCONTINUITY')
[http @ 000002c6e2614500] Opening 'http://172.20.120.75:8080/hls/test-3.ts' for reading
[http @ 000002c6e2611c00] Opening 'http://172.20.120.75:8080/hls/test-4.ts' for reading
[http @ 000002c6e81c8140] Opening 'http://172.20.120.75:8080/hls/test.m3u8' for reading
[hls @ 000002c6e260bcc0] Skip ('#EXT-X-VERSION:3')sq=    0B f=1/1
[hls @ 000002c6e260bcc0] Skip ('#EXT-X-DISCONTINUITY')
[http @ 000002c6e2614500] Opening 'http://172.20.120.75:8080/hls/test-3.ts' for reading
[http @ 000002c6e2611c00] Opening 'http://172.20.120.75:8080/hls/test-4.ts' for reading
[http @ 000002c6e81c8140] Opening 'http://172.20.120.75:8080/hls/test.m3u8' for reading
[hls @ 000002c6e260bcc0] Skip ('#EXT-X-VERSION:3')sq=    0B f=2/2
[http @ 000002c6e2614500] Opening 'http://172.20.120.75:8080/hls/test-6.ts' for reading
[http @ 000002c6e2611c00] Opening 'http://172.20.120.75:8080/hls/test-7.ts' for reading
[http @ 000002c6e81c8140] Opening 'http://172.20.120.75:8080/hls/test.m3u8' for reading
[hls @ 000002c6e260bcc0] Skip ('#EXT-X-VERSION:3')sq=    0B f=2/2
[http @ 000002c6e2614500] Opening 'http://172.20.120.75:8080/hls/test-7.ts' for reading
[http @ 000002c6e81c8140] Opening 'http://172.20.120.75:8080/hls/test.m3u8' for reading
[hls @ 000002c6e260bcc0] Skip ('#EXT-X-VERSION:3')sq=    0B f=2/2
[http @ 000002c6e2611c00] Opening 'http://172.20.120.75:8080/hls/test-8.ts' for reading


  


  From that log, repeating scenes are : test-3.ts, test-4.ts, test-7.ts, and skipped scene : test-5.ts.
  My question is : how to prevent this ?

  


  When i checked .m3u8 playlist on server side it seems normal, no repeated or skipped .ts file. Here is .m3u8 file :

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:17
#EXT-X-TARGETDURATION:4
#EXTINF:3.600,
test-1.ts
#EXTINF:3.560,
test-2.ts
#EXTINF:3.600,
test-3.ts
#EXTINF:3.600,
test-4.ts
#EXTINF:3.600,
test-5.ts
#EXTINF:3.600,
test-6.ts
#EXTINF:3.600,
test-7.ts
#EXTINF:3.520,
test-8.ts
#EXTINF:3.600,


  


  My Nginx Configuration :

  


  worker_processes 4;
events {
        worker_connections 1024;
        use epoll;
        multi_accept on;
}

# RTMP configuration
rtmp {
    server {
        listen 1935; # Listen on standard RTMP port
        chunk_size 4096;

        application show {
            live on;
            # Turn on HLS
            hls on;
            hls_path /tmp/hls/;
            hls_fragment 3;
            hls_playlist_length 60;
            # disable consuming the stream from nginx as rtmp
            deny play all;
        }
    }
}

http {
        sendfile off;
        tcp_nopush on;
        tcp_nodelay on;
        reset_timedout_connection on;
        directio 512;
        default_type application/octet-stream;

    server {
        listen 8080;

        location /hls {
            # Disable cache
            add_header 'Cache-Control' 'no-cache';
            access_log off;
            # CORS setup
            add_header 'Access-Control-Allow-Origin' '*' always;
            add_header 'Access-Control-Expose-Headers' 'Content-Length';
            # allow CORS preflight requests
            if ($request_method = 'OPTIONS') {
                add_header 'Access-Control-Allow-Origin' '*';
                add_header 'Access-Control-Max-Age' 1728000;
                add_header 'Content-Type' 'text/plain charset=UTF-8';
                add_header 'Content-Length' 0;
                return 204;
            }

            types {
                application/dash+xml mpd;
                application/vnd.apple.mpegurl m3u8;
                video/mp2t ts;
            }

            root /tmp/;
        }
location /nginx_status {
        # Turn on stats
        stub_status on;
        allow all;
    }
}
}


  


  My FFMPEG Command :

  


  ffmpeg -re -stream_loop -1 -i 'video1.mp4' -vcodec libx264 -vprofile baseline -g 30 -acodec aac -strict -2 -f flv 'rtmp://172.20.120.75/show/test' &


  


  Thank You for Your Help.

  


• ffplay : allow borderless playback windows

  1er février 2017, par Lucas Sandery

  ffplay : allow borderless playback windows
  For a pure video tile effect, and enabling better integration of playback windows
  
  into other programs. It would improve the looks in many situations and avoid ugly
  
  hacks like this : http://stackoverflow.com/q/31465630/315024
  Signed-off-by : Lucas Sandery <lucas-sandery@users.noreply.github.com>
  
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] doc/ffplay.texi
  • [DH] ffplay.c

• How to get frame-by-frame audio from the video in python

  7 juin 2023, par Usman Arshad

  So,first of all the description of my program is that I am viewing a video using opencv and whenever I press "p" the video paused for 5 seconds.At last I am saving that updated video in the same directory.I want to add audio to this video and whenever "p" pressed the audio must also be stopped for 5 second until next frame.

  


  import cv2

def save_frames(frames, output_filename, fps):
    # Get video information from the first frame
    height, width, _ = frames[0].shape

    # Create a VideoWriter object to save the frames
    fourcc = cv2.VideoWriter_fourcc(*'mp4v')
    output = cv2.VideoWriter(output_filename, fourcc, fps, (width, height))

    # Write each frame to the video file
    for frame in frames:
        output.write(frame)

    # Release the VideoWriter
    output.release()
    
def main():
    # Load the video
    video_path = 'input_video.mp4'
    cap = cv2.VideoCapture(video_path)


    frames = []
    fps = cap.get(cv2.CAP_PROP_FPS)

    while cap.isOpened():
        # Read the current frame
        ret, frame = cap.read()

        if not ret:
            break

        # Display the frame
        cv2.imshow('Video', frame)

        # Append the frame to the list
        frames.append(frame)
        # Wait for key press
        key = cv2.waitKey(int(1000 / fps))

        if key == ord('p'):
            # Pause the video for 5 seconds
            paused = True
            for _ in range(int(fps * 5)):
                frames.append(frame)
                cv2.waitKey(int(1000 / fps))
            paused = False

    # Release the VideoCapture
    cap.release()

    # Save the frames to a video file
    output_filename = 'output.mp4'
    save_frames(frames, output_filename, fps)

if __name__ == '__main__':
    main()