Sur d’autres sites (7249)

• Produce an adaptive multi-resolution mpeg-dash file from an input video file

  1er mars 2021, par Tariq Hasan

  I can produce different resolution mpeg-dash videos from running these commands separately and get one .mpd file for each of the resolutions :

  


  ffmpeg -i /path/to/input.mp4 -vf scale=1920:1080 /path/to/output.mpd
ffmpeg -i /path/to/input.mp4 -vf scale=1280:720 /path/to/output.mpd
ffmpeg -i /path/to/input.mp4 -vf scale=720:480 /path/to/output.mpd
ffmpeg -i /path/to/input.mp4 -vf scale=640:360 /path/to/output.mpd


  


  The question is, how do I get a single .mpd file that maps to all these different resolution videos which would be adaptive in resolution when streamed over the network ?

  


• HTML5 Video tag switcher for multiple resolutions

  20 avril 2016, par somecalmetim

  I have a Rails 4 app setup as a video upload/sharing site. I am using paperclip to upload videos and ffmpeg for processing 2 sizes of video into Mp4, ogg and webm.

  I want to show the smaller 240p video to mobile devices. I can do that now with media queries or Bootstraps adaptive tags but I would prefer a "resolution switcher" button similar to what I see on various other sites showing "240, 480, 720, 1080" Is this possible to do automatically within the HTML5 video tag similar to the "CC Closed Captioning" button that appears when you add subtitle files ?

  I was trying to avoid using a custom player.

  This was my quick bootstrap solution but would prefer a button/switcher.

  <div class="hidden-xs">
  
      <video style="width:100%" autobuffer="autobuffer" controls="controls" poster="&lt;%= @video.attachment.url(:preview) %>"><source label="720" type="video/mp4" default="default"><source label="ogg" type="video/ogg"><source label="webm" type="video/webm"><track label="English" kind="subtitles" srclang="en" src="/assets/subtitles.vtt" default="default"><p>Your Browser does not support the video tag.</p></track></source></source></source></video>
  
  </div>
  
  <div class="visible-xs">
  
      <video style="width:100%" autobuffer="autobuffer" controls="controls" poster="&lt;%= @video.attachment.url(:preview) %>"><source label="360" type="video/mp4" default="default"><source label="ogg mobile" type="video/ogg"><source label="webm mobile" type="video/webm"><track label="English" kind="subtitles" srclang="en" src="/assets/subtitles.vtt" default="default"><p>Your Browser does not support the video tag.</p></track></source></source></source></video>
  
  </div>

• Encoding of two full hd streams in Linux + GPU with Intel HD4000 / VA API / FFMPEG / OpenGL

  30 juin 2016, par qknight

  i want to encode/stream two full hd streams in realtime from my laptop to a remote location using linux/xorg on the host.

  VA API

  for this i’ve been playing with the VA API but the performance is pretty bad with 5.59 fps (see paste below).

  FFMPEG

  using ffmpeg with CPU encoding i get about 200 fps but then all cores of my Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz are busy and the fan turns on.

  future plans

  i want GPU support in encoding and later integrate this into a program which streams a virtual xorg ’screen’, see https://lastlog.de/wiki/index.php/Raspberry_PI_virtual_screen for more details on my plans.

  maybe h264 isn’t even what i want ? so if someone advices towards a different implementation, i’d welcome that.

  besides VA API there seems to be QuickSync but i didn’t experiment with that yet as it is not packaged on NixOS just yet.

  note : i need a library to have a smooth integration into the code.

  h264encode -w 1920 -h 1080 —profile MPSource frame is 1920x1080 and will code clip to 1920x1088 with crop
  INPUT:Try to encode H264...
  
  INPUT : Resolution : 1920x1080, 60 frames
  
  INPUT : FrameRate : 30
  
  INPUT : Bitrate : 14929920
  
  INPUT : Slieces : 1
  
  INPUT : IntraPeriod : 30
  
  INPUT : IDRPeriod : 60
  
  INPUT : IpPeriod : 1
  
  INPUT : Initial QP : 26
  
  INPUT : Min QP : 0
  
  INPUT : Source YUV : AUTO generated
  
  INPUT : Coded Clip : /tmp/test.264
  
  INPUT : Rec   Clip : Not save reconstructed frame
  libva info : VA-API version 0.38.1
  
  libva info : va_getDriverName() returns 0
  
  libva info : Trying to open /run/opengl-driver/lib/dri/i965_drv_video.so
  
  libva info : Found init function __vaDriverInit_0_38
  
  libva info : va_openDriver() returns 0
  
  Use profile VAProfileH264Main
  
  Support rate control mode (0x12):CBR CQP 
  
  RateControl mode : CQP
  
  Support VAConfigAttribEncPackedHeaders
  
  Support packed sequence headers
  
  Support packed picture headers
  
  Support packed slice headers
  
  Support packed misc headers
  
  Support 1 RefPicList0 and 1 RefPicList1
  
  Loading data into surface 15.....Complete surface loading
  
        \00000059(054456 bytes coded)
  PERFORMANCE :   Frame Rate : 5.59 fps (60 frames, 10730 ms (178.83 ms per frame))
  
  PERFORMANCE :   Compression ratio : 51:1
  
  PERFORMANCE :     UploadPicture : 10467 ms (174.45, 97.55% percent)
  
  PERFORMANCE :     vaBeginPicture : 0 ms (0.00, 0.00% percent)
  
  PERFORMANCE :     vaRenderHeader : 1 ms (0.02, 0.01% percent)
  
  PERFORMANCE :     vaEndPicture : 42 ms (0.70, 0.39% percent)
  
  PERFORMANCE :     vaSyncSurface : 244 ms (4.07, 2.27% percent)
  
  PERFORMANCE :     SavePicture : 7 ms (0.12, 0.07% percent)
  
  PERFORMANCE :     Others : -31 ms (71582787.75, 40027653.91% percent)
  
  (Multithread enabled, the timing is only for reference)
  

  i’ve seen https://www.reddit.com/r/linux/comments/1qk1yu/is_there_currently_opensource_software_to_encode/ though but i’m not sure what do do with it.