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• MPlayer not playing HTTP video stream for a specific type of content from the same source

  2 August 2017, by Joel

  Implementation overview

  Before I dive into the question, I need to establish the context from the start.

  I am currently implementing a cloud gaming solution utilising the following:

  • Nvidia Capture SDK
  • Nvidia Video Codec SDK
  • FFmpeg
  • MPlayer

  The Nvidia Capture SDK is used to produce a shim layer (via DXGI.dll), intercepting and capturing DirectX frames so that they can be passed to the Nvidia Video Codec SDK to be encoded into an h264 video format. All this is done within DXGI.dll.

  I then pass the encoded video to FFmpeg. FFmpeg acts as an HTTP server that broadcasts the video stream for MPlayer to play.

  Problem

  I am running an Unreal Engine 4 game called "Epic Survival Game Series". The Nvidia Capture SDK’s shim layer kicks off when the game starts, and FFmpeg launches the HTTP server to start streaming. However, when I start MPlayer to receive the stream, MPlayer stops at the following message, and nothing happens after that.

  libavformat version 57.72.101 (internal)
Stream not seekable!
H264-ES file format detected

  The thing is, when I play the same video using ffplay, it works without any issue. This is not the only quirk. When I launch a different Unreal Engine 4 game called "First Person Shooter Template", MPlayer can play that video as well. Also, if I modify the Survival Game to load directly into the game level by skipping the menu, MPlayer is also able to play the video.

  Using FFmpeg to write the video to a file instead of streaming it to a video also works, no matter the game or whether I loaded into the menu or game level.

  This is very strange and I do not have any idea why this is the case. Any ideas?

  Edit: One strange quirk I forgot to mention is that MPlayer does manage to play the video in very rare occasions - maybe once every 10-20 tries or so.

  Implementation Details

  Additional details of how certain parts are implemented.

  (1) For the Nvidia Capture SDK, I use the provided DXIFRShim example that is provided in the SDK

  (2) for the Nvidia Video Codec SDK, I use the provided NvEncoder example that is provided in the SDK

  (3) The FFmpeg command I use is this:
  ffmpeg -i - -listen 1 -threads 1 -vcodec copy -preset ultrafast -an -tune zerolatency -f h264 http://address:port
  The encoded frames from Nvidia Video Codec SDK is piped to FFmpeg.

  (4) The MPlayer command I use is this:
  mplayer -quiet -vo gl -nosound -benchmark http://address:port

  Things I’ve tried

  I am suspecting MPlayer to be the cause, so I’ve only played around with MPlayer parameters.
  mplayer http://address:port

  mplayer -fps 30 -vo gl -nosound -benchmark http://address:port

  mplayer -fps 30 -screenw 720 -screenh 1280 -vo gl -nosound -benchmark http://address:port

  mplayer -fps 30 -vo directx -nosound -benchmark http://address:port

  mplayer -fps 30 -vo null -nosound -benchmark http://address:port

  None of these worked.

• How to create multi bit rate dash content using ffmpeg dash muxer

  26 August 2020, by andrii

  ffmpeg documentation says that we can use dash muxer to create dash segments and manifest file with just a single command, like:

  



  ffmpeg -re -i <input /> -map 0 -map 0 -c:a libfdk_aac -c:v libx264&#xA;-b:v:0 800k -b:v:1 300k -s:v:1 320x170 -profile:v:1 baseline&#xA;-profile:v:0 main -bf 1 -keyint_min 120 -g 120 -sc_threshold 0&#xA;-b_strategy 0 -ar:a:1 22050 -use_timeline 1 -use_template 1&#xA;-window_size 5 -adaptation_sets "id=0,streams=v id=1,streams=a"&#xA;-f dash /path/to/out.mpd&#xA;

  



  Saying I have some HD video file and I want this video to be available through DASH in different bit rates, so that clients can automatically select from the alternatives based on current network conditions. Can all these be done with a single ffmpeg command, like given above?

  



  I know there is a solution with using ffmpeg + mp4box, but i'm interested if it could be done with ffmpeg only.

  


• Anomalie #2915: dans privé en colonne gauche dans h3, chevauchement texte sur lien "plus d’info"

  4 May 2015, by b b

  On semble avoir le même environnement de test, du coup je veux bien une screenshot pour illustrer le problème (je ne regarde peut-être pas au bon endroit).