I want to read the video in a stream and after the operation on the video, save it as follows.The code below consumes a lot of time to run, and consumes a lot of CPU. File.stream!(“play.mp4”,, chunk_size) |> Enum.each (fn(chunk) → # list = :binary.bin_to_list(chunk) # listEnc = for {x, counter}…

I think functions from the Enum module all all eager, maybe you can try Stream module instead. File.write! is eager as well, I think. Try IO.binwrite/2 . In general, though, you’d want to operate on frames or maybe nal units for h264, which might not be what you get just by splitting the video file i…

I tested the code below, but it makes a error: “play.mp4” |> File.stream!(,chunk_size) |> Stream.chunk_every(chunk_size, chunk_size, ) |> Enum.reduce(File.open!(“output.mp4”, [:write, :binary]), fn chunk, file → :ok = IO.write(file, chunk) file end) this error is: ** (ErlangError) Erlan…

IO.write/2 expects character data / strings. You have arbitrary binary data and that does not map properly to that assumption. You want IO.binwrite/2. That said, if you are doing significant multimedia work, you may wish to check out Membrane Framework in case it is useful / applicable to your need…

Thanks for answering. |> Enum.reduce(File.open!(“output.mp4”, [:write]), fn chunk, file → list = :binary.bin_to_list(chunk) listEnc = for {x, counter} ← Enum.with_index(list) do x ^^^ Enum.at(listKey,rem(counter,chunk_size)) end binDec = :binary.list_to_bin(listEnc) :ok = IO.binwrite(file, …

It looks from your sample code (and prior questions you posted) that you’re trying to encrypt the file using a key. Your XOR is basically implementing something called ECB mode, which is not secure . For your use-case, a stream cipher would be a better fit. Erlang supports RC4 and AES-CTR, but since …

Elixir Programming Language Forum

Read and write streaming video

Questions & Help Questions

hoseinisalim July 31, 2018, 11:29am 7

Thank you very much for your help and code but I have to implement the XOR method.