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• Performant AV1 encoding, does it exist ?

  29 novembre 2022, par V O

  I'm developing a VoD application as a white label product that runs in a SaaS context using K8s. To enable streaming, I take the input video and re-convert it into HLS segments in multiple version and codecs to reach maximum compatibility.

  


  Yesterday I started implementing AV1 as codec, as it will in near future detach h264 as it's more efficient with the same level of compatibility across all the available browsers.
That was the point where things started to get strange, as I want to have this codec instead of h264 ^^.

  


  If you take a look at the following doc pages from ffmpeg : https://trac.ffmpeg.org/wiki/Encode/AV1

  


  You will notice that there are 3 main encoders available to handle encoding to av1. These are : libaom, SVT-AV1 and rav1e. No matter which one of these I try, the performance is slow, even slower than with HEVC. Recently I came along a news article about Netflix and that they are upgrading their library to AV1. If I take a look at the numbers of media elements Netflix offers, the amount is just huge, and I really don't understand how they did it. From what I know, SVT-AV1 is developed by Netflix in cooperation with Intel, So I assume they somehow rely on hardware encoding using an Intel CPU extension.

  


  Does somebody maybe know more and how they did it ? I really can't imagine that they just do CPU only encoding. A movie would take days to get encoded.

  


  Thanks in advance

  


• lower latency LAN video streaming to Android ? [closed]

  8 janvier 2020, par LargeMoneyBanks

  I am trying to stream desktop video from windows to an Android device on the same network, but seeing huge latency even streaming windows to windows.

  Technically streaming to a unity game using this asset that doesnt support udp but DOES support HTTPS,HTTP,HLS,RTSP,RTMP. https://assetstore.unity.com/packages/tools/video/ump-android-ios-56044

  With some help from a friend I am using ffmpeg for capture, encoding, and streaming with this command :

  .\ffmpeg -threads 8 -f gdigrab -framerate 60 -i desktop -c:v libx264 -refs 3 -g 60 -loglevel debug -pix_fmt yuv420p -slices 8 -an -preset ultrafast -tune zerolatency -f mpegts -listen 1 tcp://0.0.0.0:1234

  Latency is still around 4 seconds even playing the stream on the same PC as hosting, and fiddling with the network cache. Lowering resolution, fps etc doesn’t change latency. This is my first endeavor into optimizing any kind of streaming so I am a little lost. Anyone know what I might be doing wrong or how I can get to at least under 1 second ?

  Thank you !

• why ffmpeg is hanging with very high bitrate

  3 mai 2022, par vivek gupta

  Recently I wrote the code for ffmpeg, all was working fine, but randomly and frequently the ffmpeg just becomes very slow, sometimes it works with good speed.



  


  as you could see the number of frames is very huge, as well as bitrate is abnormally high.

  


  It seems strange as even though I provided the bitrate explicitly in the code, it is not being used :

  


  Following are the filters I'm using(the marked in red is drawtxt filter ) :


  


  Need someone's help to direct me to possible fix for this issue. I'm sorry I can't share the entire code. Please note the entire code is having roughly 17000+ characters.