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• DXGI Desktop Duplication : encoding frames to send them over the network

  31 août 2018, par prazuber

  I’m trying to write an app which will capture a video stream of the screen and send it to a remote client. I’ve found out that the best way to capture a screen on Windows is to use DXGI Desktop Duplication API (available since Windows 8). Microsoft provides a neat sample which streams duplicated frames to screen. Now, I’ve been wondering what is the easiest, but still relatively fast way to encode those frames and send them over the network.

  The frames come from AcquireNextFrame with a surface that contains the desktop bitmap and metadata which contains dirty and move regions that were updated. From here, I have a couple of options :

  1. Extract a bitmap from a DirectX surface and then use an external library like ffmpeg to encode series of bitmaps to H.264 and send it over RTSP. While straightforward, I fear that this method will be too slow as it isn’t taking advantage of any native Windows methods. Converting D3D texture to a ffmpeg-compatible bitmap seems like unnecessary work.
  2. From this answer : convert D3D texture to IMFSample and use MediaFoundation’s SinkWriter to encode the frame. I found this tutorial of video encoding, but I haven’t yet found a way to immediately get the encoded frame and send it instead of dumping all of them to a video file.

  Since I haven’t done anything like this before, I’m asking if I’m moving in the right direction. In the end, I want to have a simple, preferably low latency desktop capture video stream, which I can view from a remote device.

  Also, I’m wondering if I can make use of dirty and move regions provided by Desktop Duplication. Instead of encoding the frame, I can send them over the network and do the processing on the client side, but this means that my client has to have DirectX 11.1 or higher available, which is impossible if I would want to stream to a mobile platform.

• Join two corrupt Mp4 Files

  13 mars 2019, par skm

  I have a corrupted MP4 file. I want to repair the file for which I have already read some answers at SO but none of them seem to work anymore (not free anymore).

  I found another trial software which can repair only the first half of the video. Using that Software, I am successfully able to get the first half of my video. Therefore, I want to join the same video two times so that I can get my video repaired.

  I am using Windows and have already downloaded ffmpeg. I tried to concatenate the videos following the answers on this SO post but concatenation did not work (probably because my .mp4 files are corrupt).

• fate/exr : fix pix_fmt

  2 avril 2017, par Martin Vignali

  fate/exr : fix pix_fmt
  rgb_scanline_pxr24_half_uint32_13x9.exr doesn't have alpha
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] tests/fate/image.mak
  • [DH] tests/ref/fate/exr-rgb-scanline-pxr24-half-uint32-13x9