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• ffmpeg "steam" cbr gop

  30 mars 2021, par Jintor

  It's about live video streaming to STEAM... with ffmpeg

  


  I have this command

  


  ffmpeg -re -i file-from-webcam.webm -deinterlace 
-c:v libx264 -pix_fmt yuv420p -preset veryfast 
-tune zerolatency -c:a aac -b:a 128k -ac 2 -strict -2 -crf 18 
-r 30 -g 60  -vb 1369k -minrate 1369k -maxrate 1369 -ar 44100 -x264-params "nal-hrd=cbr" 
-vf "scale=1280:720" -profile:v main 
-f flv "rtmp://ingest-rtmp.broadcast.steamcontent.com/app/steam_...."


  


  but after a few seconds, the stream stops and the log of steam says

  


      Make sure your upload key-frame interval is set to 2 seconds 
and use constant bitrate (CBR). 
Limit your encoders group of picture (GOP) to at most two times your framerate.


  


  but I do have -x264-params "nal-hrd=cbr" and -r 30 -g 60 framerate 30 GOP 60...

  


  Is there something wrong in the ffmpeg command ?
Or is it linux server related ?

  


  **** The SAME ffmpeg command work very nicely in youtube, twitter, twitch, dlive, facebook, etc...

  


  so what I'm I missing to get it work for steam ?

  


• Live Streaming WebM with Wowza Server

  2 décembre 2010, par noreply@blogger.com (John Luther)

  Guest blogger Charlie Good is CTO and co-founder of Wowza Media Systems

  As a company, we at Wowza move fast and like to tinker. When WebM was announced in May, we saw it as a promising new approach to HTML5 video and decided to do an experiment with live WebM streaming over http.

  Adding WebM VP8 video and Vorbis audio to the other encoding formats that our server supported was easy (we designed the Wowza server to be codec-agnostic). We then created a WebMfile and implemented WebM HTTP streaming.

  We originally created the demo as a proof-of-concept for the IBC show in September, 2010 but have made it available to watch on our web site.

  The file is streamed live (more precisely, "pseudo-live") over http using the Wowza server-side publishing API (PDF). The result is very impressive ; playback starts fast and the VP8 image quality is fantastic.

  You will need a WebM-enabled browser or VLC media player 1.1.5 to view the live stream.

  If you’re interested in keeping up with Wowza’s WebM progress, visit Wowza Labs or drop us a note at info@wowzamedia.com.

  

• FFMPEG Re-muxing .MKV to MP4\MV4 while retaining Dolby Digital Plus JOC [closed]

  31 décembre 2020, par David F

  My ask is, does anyone have any knowledge of how to remux and keep Enhanced AC-3 with Joint Object Control with FFMPEG.

  


  I would be grateful if anyone could help me out here. I'm remuxing a number of video files from .MKV to .MP4\M4V so they play on the Apple platform (including the TV App). It's important NOT to convert, but to remux.

  


  I have achieved the ability to remux 4K HDR with Dolby Digital Plus in a .MKV to 4K HDR with Dolby Digtial 5.1. MP4. The issue is retaining the Dolby Digital Plus. This contains the ATMOS information for object based sound.

  


  The media players on Apple reports Dolby Digital Plus for the .MKV and Dolby Digital 5.1 for .MP4. I know Dolby Labs to allow free remuxing of Dolby Digital Plus/ Atmos with sample code and information they have uploaded onto Github for developers.

  


  I'm using FFMPEG with the following command :-

  


  ffmpeg -i original.mkv -c:v copy -c:a eac3 -tag:v hvc1 output.mp4

  


  Resulting output from MediaInfo (note .MKV contains only 1 video and 1 audio track)

  


  Audio -----Original.mkv

  


  

  • ID : 2

  


  • Format : E-AC-3 JOC

  


  • Format/Info : Enhanced AC-3 with Joint
Object Coding

  


  • Commercial name : Dolby Digital Plus with Dolby
Atmos

  


  • Codec ID : **A_**EAC3

  


  • Duration : 51 min 51 s

  


  • Bit rate mode : Constant

  


  


  Audio ----- Remuxed.mp4

  


  

  • ID : 2

  


  • Format : E-AC-3

  


  • Format/Info : Enhanced AC-3

  


  • Commercial name : Dolby Digital Plus

  


  • Codec ID : ec-3

  


  • Duration : 51 min 51 s

  


  • Bit rate mode : Constant

  


  


  The remux operation finished in about 1 minute for a 8Gb 4k video file, so I know there is no reencoding.

  


  I can see that .mp4 can take E-AC-3 Joint Object Control (JOC) with the demo files from Dolby labs.

  


  I've also remuxed an MKV to MKV and able to see the same result. The JOC markings have been removed with FFMPEG

  


  Thanks in advanced.

  


  David