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• Revert "mov : Double-check that alias path is not an absolute path"

  10 juillet 2015, par Vittorio Giovara

  Revert "mov : Double-check that alias path is not an absolute path"
  This reverts commit 9286de045968ad456d4e752651eec22de5e89060.
  
  The change broke support for legit absolute file paths.
  Reported-by : Maksym Veremeyenko <verem@m1stereo.tv>.
  

  • [DBH] libavformat/mov.c

• avcodec/ffv1enc : replace 3 double precision log2() by 1 single precision log2()

  30 mars, par Michael Niedermayer

  avcodec/ffv1enc : replace 3 double precision log2() by 1 single precision log2()
  This makes the remap finding heuristic much faster
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/ffv1enc.c

• Double speed playback with ffpmeg+nginx [closed]

  25 novembre 2024, par chunjie yang

  I want to achieve 2x playback speed.
There is a streaming service A, and I want to set up a streaming server B locally to obtain streams from A and play them at 2x speed. In order to achieve this function, first use the command to make server A push the stream at twice the speed. After the local server B removes the stream, use the following command to transcode and play it. However, it is found that the stream is too laggy. I don't know why. The command is as follows :
Transcoding :

  


  ffmpeg -re -i 'http://ServerAPlaybackUrl' \
    -filter_complex "[0:v]setpts=0.5*PTS[v]" -map "[v]" \
    -r 25 \
    -c:v libx264 \
    -c:a aac \
    -b:a 128k \
    -maxrate 3000k \
    -bufsize 6000k \
    -pix_fmt yuv420p \
    -g 50 \
    -f flv \
    -threads 4 \
    rtmp://NginxUrl


  


  playing video：

  


  ffplay -fflags nobuffer http://localhost/hls/placeToM3u8.m3u8


  


  local nginx :

  


  # nginx.conf

worker_processes  1;

events {
    worker_connections  1024;
}

#rtmp {
#    server {
#        listen 1935;
#        chunk_size 4096;
#
#        application live {
#            live on;
#            record off;
#        }
#    }
#}

rtmp {
    server {
        listen 1935;
        chunk_size 4096;

        application live {
            live on;
            record off;
            hls on;
            hls_path /tmp/hls;
            #hls_cleanup on;
            hls_fragment 3s;
            hls_playlist_length 60s;
        }
    }
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;
    keepalive_timeout  65;

    server {
        listen       80;
        server_name  localhost;

        location / {
            root   html;
            index  index.html index.htm;
        }

        location /hls {
            types {
                application/vnd.apple.mpegurl m3u8;
                ./ ts;
            }
            root /tmp;
            add_header Cache-Control no-cache;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}


  


  What's the proplem ?