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• How to convert a Stream on the fly with FFMpegCore ?

  18 octobre 2023, par Adrian

  For a school project, I need to stream videos that I get from torrents while they are downloading on the server.
When the video is a .mp4 file, there's no problem, but I must also be able to stream .mkv files, and for that I need to convert them into .mp4 before sending them to the client, and I can't find a way to convert my Stream that I get from MonoTorrents with FFMpegCore into a Stream that I can send to my client.

  


  Here is the code I wrote to simply download and stream my torrent :

  


  var cEngine = new ClientEngine();

var manager = await cEngine.AddStreamingAsync(GenerateMagnet(torrent), ) ?? throw new Exception("An error occurred while creating the torrent manager");

await manager.StartAsync();
await manager.WaitForMetadataAsync();

var videoFile = manager.Files.OrderByDescending(f => f.Length).FirstOrDefault();
if (videoFile == null)
    return Results.NotFound();

var stream = await manager.StreamProvider!.CreateStreamAsync(videoFile, true);
return Results.File(stream, contentType: "video/mp4", fileDownloadName: manager.Name, enableRangeProcessing: true);


  


  I saw that the most common way to convert videos is by using ffmpeg. .NET has a package called FFMpefCore that is a wrapper for ffmpeg.

  


  To my previous code, I would add right before the return :

  


  if (!videoFile.Path.EndsWith(".mp4"))
{
    var outputStream = new MemoryStream();
    FFMpegArguments
        .FromPipeInput(new StreamPipeSource(stream), options =>
        {
            options.ForceFormat("mp4");
        })
        .OutputToPipe(new StreamPipeSink(outputStream))
        .ProcessAsynchronously();
    return Results.File(outputStream, contentType: "video/mp4", fileDownloadName: manager.Name, enableRangeProcessing: true);
}


  


  I unfortunately can't get a "live" Stream to send to my client.

  


• Find video resolution and video duration of remote mediafile

  22 février 2012, par osgx

  I want to write an program which can find some metainformation of mediafile. I'm interested in popular video formats, such as avi, mkv, mp4, mov (may be other popular too). I want basically to get :

  • Video size (720, 1080, 360 etc)
  • Total runtime of video (may be not very exact)
  • Number of audio streams
  • Name of video codec
  • Name of audio codec

  There is already the mediainfo, but in my program I want to get information about remote file, which may be accessed via ftp, http, samba ; or even torrent (there are some torrent solutions, which allows to read not-yet downloaded file).

  MediaInfo library have no support of samba (smb ://) and mkv format (for runtime).

  Also, I want to know, how much data should be downloaded to get this information. I want not to download full videofile because I have no enough disk space.

  Is this information in the first 1 or 10 or 100 KiloBytes of the file ? Is it at predictable offset if I know the container name and total file size ?

  PS : Platform is Linux, Language is C/C++

• HLS MP4 Independent Segments

  7 décembre 2016, par Mido

  Long story short : Why HLS can’t just play normal MP4 files together one after one ? Why need to segment media file into .ts segments ?

  Details :

  We’ve segmented MP4 file into mini MP4 segments (not TS), each one about 30 seconds for testing. It never plays in any HLS player, just loading all segment files then nothing happens.

  Example MP4 segment Info :

  Format                      : MPEG-4
  
  Format profile              : Base Media
  
  Codec ID                    : isom
  
  File size                   : 1.44 MiB
  
  Duration                    : 32s 950ms
  
  Overall bit rate            : 366 Kbps
  
  Writing application         : Lavf56.25.101
  
  
  
  Video
  
  ID                          : 1
  
  Format                      : AVC
  
  Format/Info                 : Advanced Video Codec
  
  Format profile              : High@L4.1
  
  Format settings, CABAC      : Yes
  
  Format settings, ReFrames   : 6 frames
  
  Codec ID                    : avc1
  
  Codec ID/Info               : Advanced Video Coding
  
  Duration                    : 32s 950ms
  
  Bit rate                    : 230 Kbps
  
  Width                       : 426 pixels
  
  Height                      : 240 pixels
  
  Display aspect ratio        : 16:9
  
  Original display aspect rat : 16:9
  
  Frame rate mode             : Constant
  
  Frame rate                  : 23.976 fps
  
  Color space                 : YUV
  
  Chroma subsampling          : 4:2:0
  
  Bit depth                   : 8 bits
  
  Scan type                   : Progressive
  
  Bits/(Pixel*Frame)          : 0.094
  
  Stream size                 : 925 KiB (63%)
  
  Writing library             : x264 core 142 r2495 6a301b6
  
  
  
  Audio
  
  ID                          : 2
  
  Format                      : AAC
  
  Format/Info                 : Advanced Audio Codec
  
  Format profile              : LC
  
  Codec ID                    : 40
  
  Duration                    : 32s 896ms
  
  Bit rate mode               : Constant
  
  Bit rate                    : 129 Kbps
  
  Channel(s)                  : 2 channels
  
  Channel(s)_Original         : 6 channels
  
  Channel positions           : Front: L C R, Side: L R, LFE
  
  Sampling rate               : 48.0 KHz
  
  Compression mode            : Lossy
  
  Stream size                 : 517 KiB (35%)

  The Master M3U8 :

  #EXTM3U
  
  #EXT-X-VERSION:7
  
  #EXT-X-INDEPENDENT-SEGMENTS
  
  
  
  #EXT-X-STREAM-INF:RESOLUTION=426x240,BANDWIDTH=370000,CODECS="avc1.640015,mp4a.40.2"
  
  240p.m3u8
  
  
  
  #EXT-X-STREAM-INF:RESOLUTION=640x360,BANDWIDTH=580000,CODECS="avc1.640015,mp4a.40.2"
  
  360p.m3u8
  
  
  
  #EXT-X-STREAM-INF:RESOLUTION=896x504,BANDWIDTH=900000,CODECS="avc1.640015,mp4a.40.2"
  
  480p.m3u8
  
  
  
  #EXT-X-STREAM-INF:RESOLUTION=1280x720,BANDWIDTH=1500000,CODECS="avc1.640015,mp4a.40.2"
  
  720p.m3u8

  240p.m3u8

  #EXTM3U
  
  #EXT-X-VERSION:7
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-PLAYLIST-TYPE:VOD
  
  #EXT-X-TARGETDURATION:34
  
  
  
  #EXTINF:33.033033,
  
  240p000.mp4
  
  #EXTINF:33.533534,
  
  240p001.mp4
  
  #EXTINF:24.941608,
  
  240p002.mp4
  
  #EXTINF:28.611945,
  
  240p003.mp4
  
  #EXT-X-ENDLIST

  When tested with HLS.js, gives this error :

  Parsing Error:no demux matching with content found,cannot recover,
  last media error recovery failed ...

  Bitmovin Player : loads all segments of all variants and never plays any of them. just stop.

  Tested on Chrome & Firefox On Windows, Safari on Mac, Android and iPad Browsers. Never works on any of them. Are we doing anything wrong ?!