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• Revert "avformat/rtp : Pass sources and block filter addresses via sdp file for rtp"

  5 avril 2020, par Carl Eugen Hoyos

  Revert "avformat/rtp : Pass sources and block filter addresses via sdp file for rtp"
  This reverts commit b71685865fe761925feedda3cd0b288224d9a509.
  The commit lead to the use of an uninitialized variable.
  
  Other issues were listed by Andreas Rheinhardt :
  
  https://ffmpeg.org/pipermail/ffmpeg-devel/2020-March/259150.html
  

  • [DH] libavformat/rtsp.c

• avformat/matroskaenc : Avoid allocations for SeekHead

  29 décembre 2019, par Andreas Rheinhardt

  avformat/matroskaenc : Avoid allocations for SeekHead
  Up until e7ddafd5, the Matroska muxer wrote two SeekHeads : One at the
  
  beginning referencing the main level 1 elements (i.e. not the Clusters)
  
  and one at the end, referencing the Clusters. This second SeekHead was
  
  useless and has therefore been removed. Yet the SeekHead-related
  
  functions and structures are still geared towards this usecase : They
  
  are built around an allocated array of variable size that gets
  
  reallocated every time an element is added to it although the maximum
  
  number of Seek entries is a small compile-time constant, so that one should
  
  rather include the array in the SeekHead structure itself ; and said
  
  structure should be contained in the MatroskaMuxContext instead of being
  
  allocated separately.
  The earlier code reserved space for a SeekHead with 10 entries, although
  
  we currently write at most 6. Reducing said number implied that every
  
  Matroska/Webm file will be 84 bytes smaller and required to adapt
  
  several FATE tests ; furthermore, the reserved amount overestimated the
  
  amount needed for for the SeekHead's length field and how many bytes
  
  need to be reserved to write a EBML Void element, bringing the total
  
  reduction to 89 bytes.
  This also fixes a potential segfault : If !mkv->is_live and if the
  
  AVIOContext is initially unseekable when writing the header, the
  
  SeekHead is already written when writing the header and this used to
  
  free the SeekHead-related structures that have been allocated. But if
  
  the AVIOContext happens to be seekable when writing the trailer, it will
  
  be attempted to write the SeekHead again which will lead to segfaults
  
  because the corresponding structures have already been freed.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskaenc.c
  • [DH] tests/fate/matroska.mak
  • [DH] tests/fate/wavpack.mak
  • [DH] tests/ref/fate/aac-autobsf-adtstoasc
  • [DH] tests/ref/fate/binsub-mksenc
  • [DH] tests/ref/fate/rgb24-mkv
  • [DH] tests/ref/lavf-fate/av1.mkv
  • [DH] tests/ref/lavf/mka
  • [DH] tests/ref/lavf/mkv
  • [DH] tests/ref/lavf/mkv_attachment
  • [DH] tests/ref/seek/lavf-mkv

• FFMPEG recording in ASP.NET Core mvc application

  19 avril 2020, par Timber

  I'm using ASP.NET Core and ffmpeg to record a live video stream. When the page receives a get request, the stream should begin recording and saving to a folder using ffmpeg. I want to make it so that when visiting the stop endpoint, the ffmpeg process is closed cleanly.

  



  Unfortunately I'm unable to send a 'q' to stdin after leaving the Get method. Using taskkill requires the use of /F making the ffmpeg process (which is not a window) force quit and not save the video properly, resulting in a corrupt file.

  



  I tried using Process.Kill() but that results in a corrupt file as well. Also, I tried Process.CloseMainWindow() which worked, but only when the process is started as a window, and I'm unable to start the process as a window in the server I'm using.

  



  I've include the code I have so far below, so hopefully someone could lead me in the right path.

  



  using System;&#xA;...&#xA;using Microsoft.Extensions.Logging;&#xA;&#xA;namespace MyApp.Controllers&#xA;{&#xA;    [Route("api/[controller]")]&#xA;    [Authorize]&#xA;    public class RecordingController : Controller&#xA;    {&#xA;        private readonly ApplicationDbContext _context;&#xA;        private readonly ILogger<homecontroller> _logger;&#xA;&#xA;        public RecordingController(ApplicationDbContext context, ILogger<homecontroller> logger)&#xA;        {&#xA;            _context = context;&#xA;            _logger = logger;&#xA;        }&#xA;&#xA;        [HttpGet]&#xA;        public async Task<actionresult> Get()&#xA;        {&#xA;&#xA;            // Define the os process&#xA;            var processStartInfo = new ProcessStartInfo()&#xA;            {&#xA;                // ffmpeg arguments&#xA;                Arguments = "-f mjpeg -i \"https://urlofstream.com/video.gci\" -r 5 \"wwwroot/video.mp4\"",&#xA;                FileName = "ffmpeg.exe",&#xA;                UseShellExecute = true&#xA;            };&#xA;&#xA;            var p1 = Process.Start(processStartInfo);&#xA;&#xA;            // p1.StandardInput.WriteLineAsync("q"); &lt;-- This works here but not in the Stop method&#xA;&#xA;            return Ok(p1.Id);&#xA;        }&#xA;&#xA;&#xA;        // GET: api/Recording/stop&#xA;        [HttpGet("stop/{pid}")]&#xA;        public ActionResult Stop(int pid)&#xA;        {&#xA;            Process processes = Process.GetProcessById(pid);&#xA;            processes.StandardInput.WriteLineAsync("q");     // Does not work, is not able to redirect input&#xA;            return Ok();&#xA;        }&#xA;    }&#xA;}&#xA;&#xA;&#xA;</actionresult></homecontroller></homecontroller>