gistfile1.js

var max_count = 200;
var start_offset = 0;
var my_params = {"owner_id": "-78352393"};
var key = "items";

var params = {"count": max_count} + my_params;

var res = API.video.get(params);
if (res["count"]){
    var count = res["count"];
    var items = res[key];

    var offset = 0;

    var i = 1;
    while(i < 25 && offset < count) {
        offset = i * max_count + start_offset;
        params = {"count": max_count, "offset": offset};
        params = params + my_params;

        res = API.video.get(params);
        items = items + res[key];

        i = i + 1;
    }
    return {"count": count, "items": items, "offset": offset, "end": offset >= count};
} else {
    return {"count": 0, "items": 0, "offset": 0, "end": true};
}