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• How to use AMD hardware acceleration VAAPI when using ffmpeg in qtcreator ? [closed]

  28 décembre 2024, par Ling Yun

  ffmpeg version:4.2.2
env:QT creator

  


  I passed this command in terminal :

  


  ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD128 -i input.mp4 -vf format=yuv420p,hwupload -c:v h264_vaapi -b:v 1000k output.mp4


  


  This can be accelerated, the CPU usage is very low
But when I want to use code to implement hardware accelerated encoding, it prompts :

  


  cannot allocate memory(-12)


  


  my c++ code :

  


  av_hwdevice_ctx_create = (&hw_device_ctx,AV_HWDEVICE_TYPE_VAAPI,"/dev/dri/renderD128");


  


  print :-12

  


  I can be sure that I compiled ffmpeg correctly because I can enable vaapi hardware acceleration through the command and my graphics card has enough video memory.

  


  Possible causes :
I introduced -lavcodec -lavformat -lavutil -lswscale in my qt pro file libs, but did not add -lva -lva-drm

  


  Is it correct to add -lva -lva-drm after libs ?
What should I do ?

  


• How to use the ffmpeg overlay_cuda filter to make a SBS video ?

  24 août 2020, par Maxtrix

  FFMPEG a few months ago launched the new version of FFMPEG with the new filter "overlay_cuda", this filter makes the same as the "overlay" but using an Nvidia card for applying it.

  


  I found on the FFMPEG website description of the filter, but no examples of how to use it. The only examples I found are from the developer commits but are to put a video or a photo over another video.

  


  I before the normal overlay filter to do this using a nullsrc image with the twice of width but now I don't know how to with this filter.

  


  Commit description : https://patchwork.ffmpeg.org/project/ffmpeg/patch/20200318071955.2329-1-yyyaroslav@gmail.com/
ffmpeg documentation webpage : https://ffmpeg.org/ffmpeg-filters.html#overlay_005fcuda-1

  


  I hope you can help me.

  


  Update :

  


  I made this FFmpeg order that :

  


  

  1. Input each video.

  


  2. The first video creates padding to the right and then is uploaded to the card's memory.

  


  3. With overlay Cuda, the other video puts on the right of the original video.

  


  


  ffmpeg -y -loglevel info \
-i $video_1  \
-hwaccel cuda -hwaccel_output_format cuda -i $video_2 \
-filter_complex \
" \
[0:v]pad=w=2*iw:h=ih:x=0:y=0,hwupload_cuda[base];
[base][1:v]overlay_cuda=x=800:y=0" \
-an -c:v h264_nvenc overlay_test.mp4


  


  But I get this error message :

  


  [overlay_cuda @ 0x55fdec4b2ec0] Can't overlay nv12 on yuv420p 
[Parsed_overlay_cuda_2 @ 0x55fdec4b2d80] Failed to configure output pad on Parsed_overlay_cuda_2
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #1:0


  


  I have issues with the pixel formats, I hope you can help me.

  


  Update 2 :

  


  I finally solved the pixel format issue and now makes the overlay with the padding (adds space to the overlay video)

  


  This is the command that succeeds :

  


  ffmpeg -y -loglevel info \
-i $video_1  \
-hwaccel cuda -hwaccel_output_format cuda -i $video_2 \
-filter_complex \
" \
[0:v]pad=w=2*iw:h=ih:x=0:y=0,hwupload_cuda,scale_npp=format=nv12[base];
[base][1:v]overlay_cuda=x=800:y=0" \
-an -c:v h264_nvenc overlay_test.mp4



  


  Now I want to change x=800 to a variable like x=iw+1 but it seems this filter doesn't support that. Is there a way to set a global variable ?

  


• FFMPEG File Output is Still in Use By a Process

  6 mai, par Tyler Bacon

  I am trying to complete this part of my program. In this section, I am trying to speed up or slow down a video based on a factor variable. Once it's done, I use moviepy to turn it into a VideoFileClip, then I delete the file.

  


      if factor <= 2:
        system("ffmpeg -i " + paths[dex] + " -vf setpts=" + str(vfactor) + "*PTS -an ./Media/Videos/temp.mp4")
        system("ffmpeg -i " + paths[dex] + " -filter:a atempo=" + str(factor) + " -vn ./Media/ShortSounds/temp.mp3")
    elif 2 < factor < 4:
        factor = round(sqrt(factor), 1)
        system("ffmpeg -i " + paths[dex] + " -vf setpts=" + str(vfactor) + "*PTS,setpts=" + str(vfactor) + "*PTS  -an ./Media/Videos/temp.mp4")
        system("ffmpeg -i " + paths[dex] + " -filter:a atempo=" + str(factor) + ",atempo=" + str(factor) + " -vn ./Media/ShortSounds/temp.mp3")
    elif factor > 4:
        raise Exception("File " + paths[dex] + " is too long.")
    t = VideoFileClip("./Media/Videos/temp.mp4")
    t.audio = AudioFileClip("./Media/Videos/temp.mp3")
    templist.append(t)
    remove("./Media/Videos/temp.mp4")


  


  However, when the code gets to the deletion command, it has the following error :

  


  PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: './Media/Videos/temp.mp4'


  


  What's strange is, I can see the temp.mp4 file, and it runs just fine. I never get this error while manually running the temp.mp4 file.

  


  I have tried the following :

  


  

  • Waiting 5, 10, and 20 seconds before deleting the file.

  


  • Running "taskkill -f -im ffmpeg.exe" before deleting the file

  


  • I went through the debugger, and right before the deletion, I checked in task manager to see if ffmpeg was still running, and it wasn't.

  


  


  Do you guys have any idea what could be holding this up ? My code worked previously when I was trying to just do audio, but I am trying it with video and this is happening.