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• avcodec/aacsbr_template : Remove pointless runtime initialization

  27 décembre 2020, par Andreas Rheinhardt

  avcodec/aacsbr_template : Remove pointless runtime initialization
  The sbr_qmf_window_us array is basically symmetric around its middle
  
  element and therefore the latter half is currently initialized from the
  
  first half at runtime. Yet because the first half is initialized, the
  
  array can't be placed in .bss at all, so that one gains nothing from not
  
  already initializing the whole array statically. Therefore this commit
  
  does exactly this.
  (There are two exceptions to the symmetry : Elements 384 and 512 are the
  
  negations of their mirror element ; for the fixed-point decoder, Q31(-x)
  
  does not equal -Q31(x). In order to keep the array exactly the same, the
  
  latter form has been used for these two elements.)
  Reviewed-by : Lynne <dev@lynne.ee>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/aacsbr_template.c
  • [DH] libavcodec/aacsbrdata.h

• FFMPEG merge one audio and one video file [duplicate]

  29 mars 2020, par Karl R

  I am trying to get this to work for a few hours and am having no luck. I have two .mp4 files - one is audio and one is video. All I want to do is merge them into one file so the audio and video play together. I know I am close but I keep getting stuck on "Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_hstack_0".

  My command I am using is :

  .\ffmpeg.exe -y -i .\camera.mp4 -i .\screen.mp4 -filter_complex hstack output.mp4

  Output of each file type is attached.

  Thank you for your help - we found a bug in a screen recording app on our AMD laptops and this will helps us with a temporary fix. I work at a tech college and we are scrambling to get online videos going for the students to learn remotely.
  pic1
  pic2

• 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 ?