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• ffmpeg to YouTube with tee mux giving resolution warning (65535x65535), which is not optimal

  25 juillet 2022, par kuldeep chopra

  I am streaming to YouTube and Facebook using ffmpeg , also writing data into disk (recording).

  


  it's working fine on Facebook and recording but on YouTube it's giving warning that is

  


  Please check the video resolution. The current resolution is (65535x65535), which is not optimal.

  


  and output on YouTube is also 1:1 aspect ratio due to the above resolution.

  


  I am using tee mux in ffmpeg Command.

  


  ffmpeg -f dshow -framerate 30 -i video="Integrated Webcam":audio="Microphone Array (Intel® Smart Sound Technology (Intel® SST))" -s 1920x1080 -c:v libx264 -r 30 -preset ultrafast -tune zerolatency -crf 28 -pix_fmt yuv420p -c:a aac -strict -2 -ac 2 -b:a 128k -t 4 -map 0 -f tee "[f=ismv]pipe:1 | [f=flv]rtmps ://youtube | [f=flv]facebook"

  


• How do i change the resolution of a outgoing hls stream using ffmpeg ?

  31 juillet 2022, par 8f7an

  I am using nginx with ffmpeg to stream my live stream and i want to reduce the resolution of it, but it plays the video in high quality everytime

  


  here's my nginx code

  


  events {}
rtmp {
    server {
        listen 1935;

    application src {
        live on;
        exec_push ffmpeg -vcodec libx264 -vprofile baseline -g 10 -s 300x200 -acodec aac -ar 44100 -ac 1 -f flv rtmp://127.0.0.1/live;
        
    }


        application live {
            live on;

            #turn on hls
            hls on;
            hls_continuous on;
            hls_path /tmp/hls/ ;
            hls_fragment 4s;
            hls_playlist_length 12s;
            hls_nested on;
            record off;

            #disable stream consumption from rtmp

            on_publish http://auth_server:4000/auth;
         }

    }
}


  


• preserve alpha channel when changing resolution in webm vp9 ffmpeg

  28 juin 2022, par Patrick Vellia

  I am running the streamio-ffmpeg gem in my Ruby code here to operate the FFMPEG command.

  


  Setting a Webm with codec VP9 that has alpha transparent frames in it as the input, I want to change the resolution from 1080p to 720p and preserve the alpha transparent frames when outputting to the same format/codec.

  


  I've tried it several different ways, but every time it outputs with a black background where the alpha transparent background should be, but ffprobe shows that ALPHA_MODE is set to 1.

  


  Here's the command that streamio-ffmpeg tells the system :

  


  ["/usr/local/bin/ffmpeg", "-y", "-i", "part1.webm", "-s", "1920x1080", "-aspect", "1.7777777777777777", "videos/movie_transparent_1920x1080.webm"]


  


  This one should have been exactly the same as the original, since the original resolution WAS 1080p. The resulting file is actually black background instead of transparent.

  


  Here's my Ruby code :

  


  def process_alpha_transparency(output)
    render_res = []
    case @height
    when 1080..2160
        render_res.append("1920x1080", "1280x720", "852x480")
    when 720..1079
        render_res.append("1280x720", "852x480")
    when 480..719
        render_res.append("852x480")
    when 0..479
        render_res.append(@resolution)
    end

    formats = ["webm", "mov"]
    combined_time_start = Time.now

    render_res.each do |res|
        formats.each do |format|
            puts "Rendering a #{res} resolution version."
            if format == "webm"
                options = {
                    resolution: res 
                }

                time_start = Time.now
                @movie.transcode("videos/#{output}_transparent_#{res}.#{format}", options)
                time_elapsed = Time.now - time_start

                puts "Te resolution rendering completed in #{time_elapsed.to_i.to_s} seconds."
            end
        end
    end

    combined_elapsed_time = Time.now - combined_time_start
    puts "The process completed in #{combined_elapsed_time.to_i.to_s} seconds."

    
end