You can start an ingest, such as a bash script, or a python script, or a program. This ingest can sequentially push multiple files into an RTMP stream, or switch files according to its own strategy.

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Can you provide a simple demo or example for this feature? I didn't understand your response.

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I have tried multiple configuration methods but none of them work.
For example:
1> input {
type file;
url /home/appops/dvr/defaultVhost/live/live-wangsugq0-201911151509.flv;
url /home/appops/dvr/defaultVhost/live/live-wangsugq0-201911211614.flv;
}
2> input {
type file;
url /home/appops/dvr/defaultVhost/live/live-wangsugq0-201911151509.flv /home/appops/dvr/defaultVhost/live/live-wangsugq0-201911211614.flv
}

Please provide a demo example from the great author.

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Can I use HTTP API to dynamically call the streaming?

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Just configure multiple ingets.

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Try this solution
ingest live2 {
enabled on;
input {
type file;
url ./doc/2.mp4;
}
ffmpeg ./objs/ffmpeg/bin/ffmpeg;
engine sd1{
enabled off;

output rtmp://127.0.0.1:[port]/live?vhost=[vhost]/livestream;

output rtmp://127.0.0.1:[port]/live/live2_sd1;
}
engine sd2{
enabled off;

output rtmp://127.0.0.1:[port]/live?vhost=[vhost]/livestream;

output rtmp://127.0.0.1:[port]/live/live2_sd2;
}
engine sd3{
enabled off;

output rtmp://127.0.0.1:[port]/live?vhost=[vhost]/livestream;

output rtmp://127.0.0.1:[port]/live/live2_sd3;
}
}

ingest rtsp1{
    enabled      on;
    input {
        type    stream;
        #url     rtsp://admin:[email protected]:554/Streaming/Channels/501?transportmode=unicast;
    url rtsp://192.168.91.41;
    }
    ffmpeg      ./objs/ffmpeg/bin/ffmpeg;
    engine {
        enabled          on;
        perfile {
            rtsp_transport tcp;
        }
        vcodec copy;
        acodec copy;
       # output          rtmp://127.0.0.1:[port]/live?vhost=[vhost]/rtsp1;
   output rtmp://127.0.0.1:[port]/live/rtsp1;
    }
}

May I ask how to add the -re parameter to ffmpeg?

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Try this solution
ingest live2 {
enabled on;
input {
type file;
url ./doc/2.mp4;
}
ffmpeg ./objs/ffmpeg/bin/ffmpeg;
engine sd1{
enabled off;

output rtmp://127.0.0.1:[port]/live?vhost=[vhost]/livestream;

output rtmp://127.0.0.1:[port]/live/live2_sd1;
}
engine sd2{
enabled off;

output rtmp://127.0.0.1:[port]/live?vhost=[vhost]/livestream;

output rtmp://127.0.0.1:[port]/live/live2_sd2;
}
engine sd3{
enabled off;

output rtmp://127.0.0.1:[port]/live?vhost=[vhost]/livestream;

output rtmp://127.0.0.1:[port]/live/live2_sd3;
}
}

ingest rtsp1{
    enabled      on;
    input {
        type    stream;
        #url     rtsp://admin:[email protected]:554/Streaming/Channels/501?transportmode=unicast;
    url rtsp://192.168.91.41;
    }
    ffmpeg      ./objs/ffmpeg/bin/ffmpeg;
    engine {
        enabled          on;
        perfile {
            rtsp_transport tcp;
        }
        vcodec copy;
        acodec copy;
       # output          rtmp://127.0.0.1:[port]/live?vhost=[vhost]/rtsp1;
   output rtmp://127.0.0.1:[port]/live/rtsp1;
    }
}

May I ask how to add the -re parameter to ffmpeg?

If you select "file" type, the -re parameter will be added automatically.

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# The first pull stream starts
    ingest {
        enabled      on;
        input {
            type    stream;
            url     rtsp://10.0.0.11/tv1;
        }
        ffmpeg       ./objs/ffmpeg/bin/ffmpeg;
        engine {
            enabled          on;
            perfile {
                rtsp_transport tcp;
            }
            vcodec copy;
            acodec copy;
            output          rtmp://127.0.0.1:[port]/live/tv1;
        }
    }    
    
# The first pull stream ends

# The second pull stream begins
    ingest tv2 {
        enabled      on;
        input {
            type    stream;
            url     rtsp://10.0.0.12/tv2;
        }
        ffmpeg       ./objs/ffmpeg/bin/ffmpeg;
        engine tv2 {
            enabled          on;
            perfile {
                rtsp_transport tcp;
            }
            vcodec copy;
            acodec copy;
            output          rtmp://127.0.0.1:[port]/live/tv2;
        }
    }    
    
# The second pull stream ends

# Multiple pull streams can refer to the above format

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