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• Ffmpeg cpp libav randomly uses high cpu and less gpu or uses high gpu and less cpu with hw accel

  29 avril 2024, par cngkyt

  I am using ffmpeg as library with cpp
the integration of library is perfectly done i am using AVFilterGraph as audio resampler and video pixfmt converter.

  


  I cannot share code because it is a complete library and contains too many files but i can assure there is no problem about code but maybe approach.

  


  My whole class is based on the transcode example of ffmpeg
text

  


  The problem is when i run my program that encodes approx 90 streams

  


  it starts with 25% cpu usage 80% gpu encode usage %85 gpu decode usage with 100% sm utilization

  


  or

  


  it starts with 80% cpu usage 45% gpu encode usage 50% gpu decode usage with 60% sm utilization

  


  when it start like second type of utilization videos are perfect
but when it starts like the first type of utilization videos are freezing

  


  my program uses pure gpu for encoding for all streams but using gpu decoding for every 3 cpu deoding
that means i use hwaccel for 1/3 of streams
because my cards are 4070 ti super and they have 2 NVENC 1 NVDEC chips

  


  my program takes udp streams and encode it and outputs udp mpegts

  


  bitrate and quality settings are persistent across streams depending on resolution

  


  i always test on same streams

  


  the problem happens randomly
but if it starts with high cpu and low gpu utilization it goes on like this
when i restart program problem occurs randomly again

  


  what can couse this

  


  just as an info i have experience on c++ more than 25 years

  


  if there is someone who can teach me something i will be happy

  


  thanks for your further helps

  


  i have tried to reproduce it with compiled ffmpeg instead of my libav library usage
same thing happens but not often

  


  i have tried using hevc_cuvid instead of hwacceleration with avcodec_find_decoder_by_name function

  


• sh4 : remove architecture

  7 juin 2024, par Rémi Denis-Courmont

  sh4 : remove architecture
  Support for SuperH was dropped over a decade ago. There no longer is any
  
  architecture-specific code to be found, so just remove the corresponding
  
  test. Technically it is still possible to compile FFmpeg as the
  
  "generic" (pure C) architecture.
  

  • [DH] configure
  • [DH] libavcodec/sh4/README

• MSE video fragments [closed]

  21 juin 2024, par Bogdan Rusu

  I am trying to build a Javascript web streammer, which uses MediSource and a buffer.
I append to the buffer every new fragment that is comming, which allows me to stream a video.

  


  To be more in context, its done with MPEG DASH. I have the video init.mp4 file and the m4s fragments.

  


  However, I want to add some videos that are pure mp4 video, and I cannot append them to the buffer, since they are not fragments related to the first stream. I was thinking about converting them to m4s fragment, but I don't understand how to do it. As far as I've read, m4s fragments are mp4 videos without the initial metadata and some other atoms/boxes removed.

  


  Is there a way to convert a mp4 video to one big m4s segment of the same duration and to properly append it to the MediaSource buffer ? Is there a way to manually create a m4s segment from a mp4 video ?

  


  I tried multiple tools such as Bento4 and some ffmpeg commands that converts the mp4 video in a mp4 fragment. But every time I append it to the buffer, the video stops and cannot read further. Especially with chrome.

  


  With bento4, after I mp4fragment, chrome can't seem to play the second fragment and the player always stops.