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• Nginx can't record live streaming results for medium resolution

  1er juillet 2021, par firman alislami

  when i finished live streaming, the live streaming result file was not recorded for medium resolution...

  


     rtmp {
server {
    listen 1935;
    chunk_size 4096;            
application live {
    live on;
    exec_push /usr/bin/ffmpeg -re -i rtmp://localhost/live/$name 
   -async 1 -vsync -1
    -c:v libx264 -c:a aac -b:v 200k  -b:a 34k  -vf "scale=240:trunc(ow/a/2)*2"  -tune zerolatency -preset superfast -crf 23 -f flv rtmp://localhost/hls/$name_low
    -c:v libx264 -c:a aac -b:v 300k  -b:a 64k  -vf "scale=360:trunc(ow/a/2)*2"  -tune zerolatency -preset superfast -crf 23 -f flv rtmp://localhost/hls/$name_low360
    -c:v libx264 -c:a aac -b:v 800k  -b:a 64k  -vf "scale=480:trunc(ow/a/2)*2"  -tune zerolatency -preset superfast -crf 23 -f flv rtmp://localhost/hls/$name_low480
    -c:v libx264 -c:a aac -b:v 1800k  -b:a 128k -vf "scale=720:trunc(ow/a/2)*2"  -tune zerolat#-acodec  copy -vcodec copy -f flv rtmp://localhost/hls/$name;
}
application hls {
    live on;
    deny play all;
    hls on;
    hls_fragment 4;
    hls_playlist_length 20;
    hls_path /mnt/hls;
    hls_variant _mid BANDWIDTH=1800000,RESOLUTION=1280x720; 
    hls_variant _low480 BANDWIDTH=80000,RESOLUTION=858x480;
    hls_variant _low360 BANDWIDTH=300000,RESOLUTION=480x360;
    hls_variant _low BANDWIDTH=200000,RESOLUTION=352x240; 
    hls_nested on;
        record all;
        record_path /mnt/record/;
        record_unique on;
            exec_record_done ffmpeg -y -i $path -acodec libmp3lame -ar 44100 -ac 1 -vcodec libx264 $dirname/$basename.mp4;
            }
    }
    


  


  }ency -preset superfast -crf 23 -f flv rtmp ://localhost/hls/$name_mid ;
#-c:v libx264 -c:a aac -b:v 1024k -b:a 128k -vf "scale=1080:trunc(ow/a/2)*2" -tune zerolatency -preset superfast -crf 23 -f flv rtmp ://localhost/hls/$name_high
#-c copy -f flv rtmp ://localhost/hls/$name_src ;

  


• add watermark to video with FFMPEG and convert to HLS for all resolution

  25 juin 2021, par sina

  I'm using this package : aminyazdanpanah/PHP-FFmpeg-video-streaming. I try to add a watermark to a video and I am using "hls" after adding a watermark method. The problem is the watermark is apply just for one resolution and the other representations does not work.

  


  For example, I use this method :

  


  $video ->filters() ->watermark('sample.png', [ 'position' => 'relative', 'bottom' => 50, 'right' => 50, ]);

$video->hls() ->setFormat($format) ->autoGenerateRepresentations([144,360,480]) ->save('sample.m3u8');


  


  In this case only the default representation is save (depend on video resolution) and other quality not generate.

  


  Is there a way to add watermark to hls (all quality) ?

  


• Is there any way to switch the resolution on the fly when streaming with RTMP ?

  25 mai 2021, par wwd

  I built nginx with nginx-http-flv-module as the RTMP server. And I used ffmpeg-python to upload the stream. I have searched a lot about "how to switch the resolution on the fly". However, it seems like that nobody do something like that.

  


  So, I did a test by periodically rerunning a new ffmpeg uploading process while the client(opencv-python) keeps receiving the data.
I found that the resolution was switched successfully, but the frame near the switch was often broken. And opencv sometimes exits without any logs.

  


  Is there any way to achieve this ?

  


  Here is the test code of my streamer :

  


  import cv2
import ffmpeg


if __name__ == "__main__":
    cap1 = cv2.VideoCapture("videos/1944x960/video.mp4")
    cap2 = cv2.VideoCapture("videos/972x480/video.mp4")

    pushing_process = None
    count = 0
    hr = True

    while True:
        ret1, frame1 = cap1.read()
        ret2, frame2 = cap2.read()
        if not ret1 or not ret2:
            break

        if hr:
            if pushing_process is None:
                pushing_process = ffmpeg.input("pipe:", format="rawvideo", pix_fmt="bgr24",
                                               s=f"{1944}x{960}") \
                    .output("rtmp://127.0.0.1:1935/myapp/s", pix_fmt="yuv420p", f="flv", vcodec="h264",
                            loglevel="error") \
                    .global_args("-re").run_async(pipe_stdin=True)

            frame = frame1
        else:
            if pushing_process is None:
                pushing_process = ffmpeg.input("pipe:", format="rawvideo", pix_fmt="bgr24",
                                               s=f"{972}x{480}") \
                    .output("rtmp://127.0.0.1:1935/myapp/s", pix_fmt="yuv420p", f="flv", vcodec="h264",
                            loglevel="error") \
                    .global_args("-re").run_async(pipe_stdin=True)
            frame = frame2
        pushing_process.stdin.write(frame.tobytes())
        count += 1
        if count == 60:
            hr = not hr
            pushing_process.stdin.close()
            pushing_process.wait()
            pushing_process = None
            count = 0

    pushing_process.stdin.close()
    pushing_process.wait()



  


  And the client :

  


  import cv2

if __name__ == "__main__":
    cap = cv2.VideoCapture("http://127.0.0.1/live?app=myapp&stream=s")
    while True:
        ret, frame = cap.read()
        if not ret:
            break
        cv2.imshow("frame", cv2.resize(frame, (1944, 960), interpolation=cv2.INTER_CUBIC))
        cv2.waitKey(0)