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• Video encoder with low CPU usage on Atom 230

  8 février 2016, par Alexandr Zarubkin

  What are my options for screen capturing on Atom 230 CPU that will result in reasonably low CPU usage ?
  I’m using ffmpeg and would like to leave CPU power to other applications while recording a screencast without lags.
  Maybe there’s hardware support for certain codec ?

• FFmpeg : Encode x264 with AMD GPU on Windows ?

  20 septembre 2023, par ZeroTek

  I am currently trying to record a Video on my Lenovo Laptop with its Built-In Webcam using FFmpeg on Windows 10. One of my goals is to keep the CPU Usage as low as possible, that's why i want to push the h264 encoding to the GPU. 
Now it gets a bit tricky here with my Laptop. Because it uses two GPUs. The first GPU is a Intel HD 5500 Graphics Unit as Part of the CPU. This one is most likly used for non-demanding Applications like office etc. to save Energy. The other one is a AMD R5 M330 that will be used for graphic intense applications like gaming.

  



  Currently, i am using the following command to encode the Webcam Stream on the Intel HD GPU :

  



  ffmpeg -f dshow -vcodec mjpeg -video_size 1280x720 -framerate 30 video="Lenovo EasyCamera":audio="Mikrofon (Realtek High Definition Audio)" -c:v h264_qsv -g 60 -q 28 -look_ahead 0 -preset:v faster -c:a aac -q:a 0.6 -r 30 output.mp4


  



  This does work so far but it seems this GPU does not have enough Power to keep up with the framerate on higher bitrates or with a high amount of i-frames. The Video starts lacking and skipping frames. If i am using CPU encoding everything works smooth.

  



  Now that my Laptop got that second AMD GPU with a lot more Power it would be a nice Try to encode on that one, but i can't find any information about how to encode on AMD Hardware on Windows 10. So my question is : How does the ffmpeg command look like to use AMD Hardware for h264 encoding ?

  


• String input in .bat script for ffmpeg encoder

  27 janvier 2016, par Ѕвонко Петровски

  Okay, I have this script which does batch encoding in ffmpeg. It basically calls upon ffmpeg for every file. What I want to do is to make the script ask for input and output locations before it starts executing.

  Here is the original script :

  for %%a in ("*.mp4") do "G:\ffmpeg\bin\ffmpeg" -i "%%a" -c:v libx264 -preset slow -crf 20 -maxrate 15000k -bufsize 2000k -acodec copy "newfiles\%%~na.mp4"

  Now I’d like to be able to input a string with a location for the files in he first brackets ("*.mp4") and at the end for "newfiles\%% na.mp4".

  I would presume that %% na is used to generate number orders or something but I’m not completely sure.

  I would presume that two variables/strings need to be created and then utilized by reading from keyboard. Sadly I have absolutely no experience with this. Did some c++ in school but that was that.

  Thanks in advance.