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• I'm trying to compile real static FFmpeg for macOS Arm Silicon but I don't know how to do it based on the website (https://www.osxexperts.net)

  15 mai 2023, par EngMec

  I'm trying to compile real static FFmpeg for macOS Arm Silicon, but I have no experience and I don't know how to do it based on the website (https://www.osxexperts.net).

  


  Could someone help me with a step-by-step where to put the downloaded files and especially how to Build for ARM (Apple Silicon) the script.

  


  As I said, I don't know how to do it and I need help as in a step by step

  


  explanatory capture

  


  As I said, I don't know how to do it and I need help as in a step by step

  


  Thank you very much if you can help me

  


• How to effectly record and encode from udp stream(4K HECV) in real time with ffmpeg ?

  25 janvier 2021, par Sa Mei

  I have a serious problem about ffmpeg to solve.
My task is to record from udp stream(4K HECV) and encode it to a mxf file.
My CPU is Intel(R) Xeon(R) Gold 5122 CPU@3.60GHz
The situation of CPU when it is recording from udp stream

  


  The situation of the udp stream

  


  The ffmpeg I used from https://github.com/BtbN/FFmpeg-Builds/commit/86af523883173be93c69d1170d1f78f79dc5e9f8 .
The command I used is :
ffmpeg -y -threads 6 -i "udp ://@225.1.2.150:6150 ?overrun_nonfatal=1&fifo_size=50000000" -threads 32 -qscale:v 2 -alternate_scan 1 -f mxf "G :\4k.xmf"

  


  Now the speed is lower than 1.0x after running for a while(about 10minutes). Maybe this is due to the temperature of the cpu gradually increasing.
The picture above displays the performance of CPU when we specify threads=6 for decoding and threads=32 for encoding.
I found that the speed would be 1.0x if I just recorded it to a .hecv file. But now I want to encode the stream to a .mxf file in real time. But as you can see, if I tried to encode it in real time, the speed of decoding and encoding would always be lower than 1.0x (around 0.98x). After running this command for about 3 hours, the recording and encoding process will be stopped.

  


  How to solve it ? I expect that the speed is 1.0x by speeding up encoding or other ways.
Or anyone knows that how to record the udp stream without re-encoding to a .hecv file and meanwhile encode the .hecv file to a .mxf file ?

  


• Revision 70eb862fd3 : Merge "Use small transform size in non-rd real-time mode"

  9 juin 2014, par Yunqing Wang

  Changed Paths :
   Modify /vp9/encoder/vp9_encodeframe.c

  
  
  Merge "Use small transform size in non-rd real-time mode"