Как я могу создать миниатюру из mpg видео с C#?

Я удалил свой комментарий, я понимаю, что вы собираетесь после второго прочтения.

Это довольно просто, используя rleid() из data.table

library(data.table)

## Note: store times as POSIXct instead of POSIXlt for drastic performance improvement
time <- c(as.POSIXct("2017-02-03 09:00:01"),
          as.POSIXct("2017-02-03 09:00:03"),
          as.POSIXct("2017-02-03 09:00:06"),
          as.POSIXct("2017-02-03 09:00:09"),
          as.POSIXct("2017-02-03 09:00:10"),
          as.POSIXct("2017-02-03 09:00:20"),
          as.POSIXct("2017-02-03 09:00:23"),
          as.POSIXct("2017-02-03 09:00:34"),
          as.POSIXct("2017-02-03 09:00:44"),
          as.POSIXct("2017-02-03 09:01:07"))

price <- c(100, 100, 100, 99, 98, 99, 100, 101, 101, 100)

data <- data.frame(time, price)

## Convert to a data.table
setDT(data)

## Create a summary using a generated counter on the fly with 
## the `rleid` function from data.table to group consecutive
## sequences together and then operate by group. the `.N`
## operator is another special symbol in data.table
## that we can use to return the number of rows in each group
## here. See ?special-symbols to learn more
Summary <- data[, .(start = first(time),
                    end = last(time),
                    nbr_records = .N,
                    duration_sec = as.numeric(last(time)) - as.numeric(first(time))
                    ), by = .(Counter = data.table::rleid(price))]

## Drop the Counter variable assuming you don't need it
Summary[,Counter := NULL]

## Results
print(Summary)

#                  start                 end nbr_records duration_sec
# 1: 2017-02-03 09:00:01 2017-02-03 09:00:06           3            5
# 2: 2017-02-03 09:00:09 2017-02-03 09:00:09           1            0
# 3: 2017-02-03 09:00:10 2017-02-03 09:00:10           1            0
# 4: 2017-02-03 09:00:20 2017-02-03 09:00:20           1            0
# 5: 2017-02-03 09:00:23 2017-02-03 09:00:23           1            0
# 6: 2017-02-03 09:00:34 2017-02-03 09:00:44           2           10
# 7: 2017-02-03 09:01:07 2017-02-03 09:01:07           1            0