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• ffmpeg : combine portrait and landscape video files in one file by adding a black frame

  18 juillet 2021, par Oliver

  i use my iPhone to record videos. Usually i get a lot of short clips, which I upload to my pc and then concatenate them with ffmpeg using this command :

  


  ffmpeg -f concat -safe 0 -i filelist.txt -c:v libx265 -preset slow -x265-params strong-intra-smoothing=0:merange=58 -crf 25 -c:a aac -b:a 320k -tag:v hvc1 output.mp4


  


  filelist contains a list of these clips sorted by date. This works fine, but recently a had some clips recorded in portrait mode. The result was an output video which contained the portrait clips stretched to fill the full horizontal space. Instead of that i would like to just have the horizontal space filled with black borders. Is that possible by changing the command posted above ? Or do i have to convert those portrait clips before ?

  


• ffmpeg vaapi - scale a video keeping the aspect ratio and padding with black lines

  26 décembre 2022, par Rusty Lemur

  I'm trying to use my Vega 11 GPU to perform hardware accelerated transcoding of some video files to a resolution of 1280x720. I would like to keep the original aspect ratio and add black bars to the borders as necessary. I can get the scaling to work with the following :

  


  ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128 -i input.mp4 -codec:v h264_vaapi -vf scale_vaapi=w=1280:h=720,setsar=1:1 output.mp4


  


  But some of the image gets stretched with that, and the original aspect ratio is not preserved.

  


  On the Raspberry Pi I can get the effect I want with the following :

  


  ffmpeg -i input.mp4 -b:v 2M -vf scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:'(ow-iw)/2':'(oh-ih)/2',setsar=1 -vcodec h264_v4l2m2m -num_capture_buffers 128 output.mp4


  


  But when I try to use the force_original_aspect_ratio and pad options with the vaapi codec, I get the following error :

  


  ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128 -i input.mp4 -codec:v h264_vaapi -vf scale_vaapi=w=1280:h=720,pad=1280:720:'(ow-iw)/2':'(oh-ih)/2',setsar=1:1 output.mp4

Impossible to convert between the formats supported by the filter 'Parsed_scale_vaapi_0' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #0:0


  


  Is there another option I should use to get the padding and keep the original aspect ratio ?

  


• NGINX-RTMP : adaptive multi bitrate streaming by ffmpeg got BLACK SREEN OUT PUT

  28 mars 2022, par duxng17

  I am using Nginx-rtmp for live adaptive bitrate streaming with HLS from OBS .
The encoding is run ok , but my livestream output in my web got black screen and still have the sound . i tried many ways to fix my issue but i cant . just helping me .
THIS IS MY NGINX CONFIG :

  


  rtmp {
    server {
        listen 1935;
        chunk_size 4000;
        application live {
            live on;
            on_publish http://auth_sever:8000/auth;
            exec ffmpeg -i rtmp://localhost/live/$name
                        -c:v libx264 -profile:v baseline -b:v 768K -s 640x360 -crf 23 -f flv -c:a aac -ac 1 -strict -2 -b:a 96k rtmp://localhost/show/$name_360
                        -c:v libx264 -profile:v baseline -b:v 1024K -s 960x540 -crf 23 -f flv -c:a aac -ac 1 -strict -2 -b:a 128k rtmp://localhost/show/$name_480
                        -c:v libx264 -profile:v baseline -b:v 1920K -s 1280x720  -crf 23 -f flv -c:a aac -ac 1 -strict -2 -b:a 128k rtmp://localhost/show/$name_720
                       -c:v libx264 -profile:v baseline -b:v 4000K -s 1920x1080 -crf 23 -f flv -c:a aac -ac 1 -strict -2 -b:a 128k rtmp://localhost/show/$name_1080;
        }
        application show {
            live on;
            deny play all; # disable consuming the stream from nginx as rtmp
            hls on;
            hls_path /tmp/hls; 
            hls_nested on;
            hls_fragment 4s; # default is 5s
            hls_playlist_length 60s;
            hls_variant _360 BANDWIDTH=448000;
            hls_variant _480 BANDWIDTH=1152000;
            hls_variant _720  BANDWIDTH=2048000;
            hls_variant _1080 BANDWIDTH=4096000; 
        }
    }
}

http {
    sendfile off;
    tcp_nopush on;
    directio 512;
    default_type application/octet-stream;
    # LOAD-BALANCED
    upstream myapp {
        server localhost:8001;
        server auth_sever:8000;
    }
    server {
        listen 8080 default_server;
        location / {
        proxy_pass http://myapp;
        proxy_set_header Host            $host;
        proxy_set_header X-Forwarded-For $remote_addr;
        }
    }
    server {
        listen 8081;
        location / {
            root /www;
        }
        location /hls {
            types {
                application/vnd.apple.mpegurl m3u8;
                application/octet-stream ts;
            }
            # Disable cache
            add_header 'Cache-Control' 'no-cache';

            # 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;
            }
            root /tmp;
        }
    }
}


  


  THIS MY DOCKERFILE CONFIG :

  


  FROM tiangolo/nginx-rtmp
RUN apt-get -y update
RUN apt-get -y upgrade
RUN apt-get install -y ffmpeg
COPY nginx.conf /etc/nginx/nginx.conf
COPY index.html /www/


  


  THE LAST , SORRY , MY ENG IS NOT GOOD ! thank for helping !