Converting HLS streams with FFMPEG in ASP.NET Core 5.0 MVC

Overview

I am currently developing a media streaming server using ASP.net Core REST Server, utilizing .NET 5.0 and ASP.net Core MVC.

What I'm Looking For

I require the ability to dynamically reduce the resolution of the original video file, such as converting it from 1080p to 720p. Additionally, I need the capability to transcode the media file into different encodings based on client capabilities.

Methods I've Explored

I have been searching for a library that can accomplish this task, but so far, I have not found one. I initially believed FFMpeg could handle this. I am aware that applications like Plex and Emby are able to achieve this functionality successfully.

C#

public static FileStream GetTranscodedStream(string requestedUser, string path, int targetResolution, int targetBitRate)
{
    // Code snippet omitted for brevity
}

[HttpGet("{tmdb}/{user}/video/transcoded")]
public IActionResult GetMovieStream(string tmdb, string user, int resolution, int bitrate)
{
    // Code snippet omitted for brevity
}

HTML

<link rel="stylesheet" href="/assets/lib/video.js/video-js.css">
    <video id="vid1" class="videojs vjs-default-skin" controls data-setup="{}" preload="auto">
        <source src="http://127.0.0.1:3208/api/get/movies/299687/dcman58/video/transcoded?resolution=480&bitrate=4800" type="application/x-mpegURL">
    </video>

Javascript

var player = videojs('vid1');
player.play();

ERROR

ERROR 416: Range Not Satisfiable "http://127.0.0.1:3208/api/get/movies/299687/dcman58/video/transcoded?resolution=480&bitrate=4800"
javascriptc#asp.netffmpeg

Answer №1

Issue lies within this specific line of code:

Response.Headers.Add("Content-Range", $"bytes {0}-{fileSize}/{fileSize}");

You can find more information about the error here: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/416

It seems like your current approach may be incorrect. FFMPEG encoding must finish completely before you can begin sending any data back to the client. Real-time retrieval of output from FFMPEG is not possible.

The code snippet provided does not clarify if the files have already been converted and stored on disk when attempting to return them. If they have, simply return the file itself without specifying ranges. The use of 

"application/x-mpegURL"
in your return will handle everything for you automatically.

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