v3_EN_Snapshot

Snapshot

SRS provides workaround for snapshots:

1. HttpCallback: Use http callbacks to handle on_publish event to snapshot by FFMPEG, and to stop FFMPEG when got on_unpublish event.
2. Transcoder: Use transcoder to snapshot.

HttpCallback

This section describes how to use http callbacks to snapshot.

First, start the sample api server:

python research/api-server/server.py 8085

Second, write the config for SRS to snapshot:

# snapshot.conf
listen              1935;
max_connections     1000;
daemon              off;
srs_log_tank        console;
vhost __defaultVhost__ {
    http_hooks {
        enabled on;
        on_publish http://127.0.0.1:8085/api/v1/snapshots;
        on_unpublish http://127.0.0.1:8085/api/v1/snapshots;
    }
    ingest {
        enabled on;
        input {
            type file;
            url ./doc/source.200kbps.768x320.flv;
        }
        ffmpeg ./objs/ffmpeg/bin/ffmpeg;
        engine {
            enabled off;
            output rtmp://127.0.0.1:[port]/live?vhost=[vhost]/livestream;
        }
    }
}

Thrird, start SRS and the ingest will publish RTMP stream, which will trigger the on_publish event, then api will snapshot:

./objs/srs -c snapshot.conf

The snapshot generate thumbnails to directory:

winlin:srs winlin$ ls -lh research/api-server/static-dir/*.png
-rw-r--r--  1 winlin  staff  74737 Oct 20 12:18 live-livestream-001.png
-rw-r--r--  1 winlin  staff  92856 Oct 20 12:18 live-livestream-002.png
-rw-r--r--  1 winlin  staff  11371 Oct 20 12:18 live-livestream-003.png

User can access it by http server: http://localhost:8085/live-livestream-001.png

Winlin 2015.10