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• Derive qsv hwdevice from D3D11VA hwdevice using FFMPEG

  29 mars 2022, par Caio Augusto

  I'm trying to derive a QSV hwcontext from D3D11VA device in order to encode d3d11 frames but I'm getting an error when calling av_hwdevice_ctx_create_derived.

  


    buffer_t ctx_buf { av_hwdevice_ctx_alloc(AV_HWDEVICE_TYPE_D3D11VA) };

  auto ctx = (AVD3D11VADeviceContext *)((AVHWDeviceContext *)ctx_buf->data)->hwctx;

  std::fill_n((std::uint8_t *)ctx, sizeof(AVD3D11VADeviceContext), 0);

  auto device = (ID3D11Device *)hwdevice_ctx->data;

  device->AddRef();
  ctx->device = device;

  ctx->lock_ctx = (void *)1;
  ctx->lock     = do_nothing;
  ctx->unlock   = do_nothing;

  auto err = av_hwdevice_ctx_init(ctx_buf.get());


  


  and then I call

  


    av_hwdevice_ctx_create_derived(&derive_hw_device_ctx, AV_HWDEVICE_TYPE_QSV, ctx_buf.get(), 0);


  


  I'm seeing this in the log :

  


  [AVHWDeviceContext @ 000001de119a9b80] Initialize MFX session: API version is 1.35, implementation version is 1.30
[AVHWDeviceContext @ 000001de119a9b80] Error setting child device handle: -16


  


  Please let me know if you have any idea how to fix it or a different approach to encode d3d11 frames on QSV encoder.

  


  Thank you.

  


  OS: windows 10 64bits
CPU: Intel i5-8400
Graphics card: Nvidia GT1030 (has no hw encoder)


  


• How to convert raw video file (.ign) to .mp4 ?

  30 octobre 2014, par aizaaz

  I want to get videos out of Aakash iTutor (education tablet with Android 4.1) to store them on my PC. I found out where the videos actually are in the educhip (memory card). The videos had their extensions removed and I simply started renaming them but I couldn’t find the extensions.

  • Can I get the app’s internal video player to convert it ?
  • Or can I convert an unknown format video i.e. .ign to mp4 or something playable ?

  In case that’s not possible, can you help manually screen-record those videos at at least 30fps with soundcard sound (Screen Record Pro showed that the content was secure and couldn’t be recorded.)

  Another player (.rec ) does not work with 4.1 Android.

  Also, there are 4 folders in the educhip and all the folders (including the one in which these videos with no format are placed) have a lot of small files around (300B to 40kB) that too with no extension.

  • Link for apk
  • Sample video file
  • Image explaination

• FFMPEG Conversion Command Produces 360p Video from Picture Input ?

  22 janvier 2021, par Sarah Szabo

  I'm trying to generate a high quality video of the timelapse of the night sky (+stars) that I did last night, but the output video is 360p an missing a lot of detail.

  


  My Fuji X-T200 usually offers a 4K video of the images that it took, but i opted to assemble the images manually so that I wouldn't take up valuable SD card space.

  


  Here is the command :
ffmpeg -framerate 24 -pattern_type glob -i '*.png' -c:v libx265 -r 30 -pix_fmt yuv420p Starlapse.mp4

  


  What command should I use to best assemble the videos in 1080p or 4K ?

  


  EDIT 0 :
Output Video : https://www.youtube.com/watch?v=xbYI98fctrw&feature=youtu.be

  


  Input frame :