Wcap Save

Simple and efficient screen recording utility for Windows 10

Project README

wcap

Simple and efficient screen recording utility for Windows.

Get latest binary here: wcap.exe (WARNING: Windows Defender or other AV software might report false positive detection)

Features

  • press Ctrl + PrintScreen to start recording current monitor (where mouse cursor currently is positioned)
  • press Ctrl + Win + PrintScreen to start recording currently active window
  • press Ctrl + Shift + PrintScreen to select & record fixed position area on current monitor
  • press any of previous combinations to stop recording
  • right or double-click on tray icon to change settings
  • video encoded using H264/AVC or H265/HEVC
  • audio encoded using AAC or FLAC
  • for window capture can capture full window area (including title bar/borders) or just the client area
  • optionally exclude mouse cursor from capture
  • can limit recording length in seconds or file size in MB's
  • can limit max width, height or framerate - captured frames will be automatically downscaled

Details

wcap uses Windows.Graphics.Capture API available since Windows 10 version 1903, May 2019 Update (19H1) to capture contents of window or whole monitor. Captured texture is submitted to Media Foundation to encode video to mp4 file with hardware accelerated H264 codec. Using capture from compositor and hardware accelerated encoder allows it to consume very little CPU and memory.

You can choose in settings to capture only client area or full size of window - client area will not include title bar and borders for standard windows style. Recorded video size is determined by initial window size.

Video is encoded with H264 or H265 codec using Media Foundation API. Make sure your GPU drivers are updated if something is not working with hardware video encoding - by default hardware encoder is preferred, but you can disable it in settings - then video will be encoded using Microsoft Media Foundation H264 software encoder. It will be also automatically used in case GPU/driver does not provide hardware accelerated encoder. You might want to explicitly use software encoder on older GPU's as their hardware encoder quality is not so great.

Audio is captured using WASAPI loopback recording and encoded using Microsoft Media Foundation AAC encoder, or undocumented Media Foundation FLAC encoder (it seems it always is present in Windows 10).

Recorded mp4 file can be set to use fragmented mp4 format in settings (only for H264 codec). Fragmented mp4 file does not require "finalizing" it. Which means that in case application or GPU driver crashes or if you run out of disk space then the partial mp4 file will be valid for playback. The disadvantage of fragmented mp4 file is that it is a bit larger than normal mp4 format, and seeking is slower.

You can use settings dialog to restrict max resolution of video - captured image will be scaled down to keep aspect ratio if you set any of max width/height settings to non-zero value. Similarly framerate of capture can be reduced to limit maximum amount of frames per second. Setting it to zero will use compositor framerate which is typically monitor refresh rate. Lower video framerate will give higher quality video for same bitrate and reduced GPU usage. If you notice too many dropped frames during recording, try reducing video resolution and framerate.

Capture of mouse cursor in video can be disabled only when using Windows 10 version 2004, May 2020 Update (20H1) or newer.

Creating gif from mp4

If you want to create gif file out of recorded mp4 file, you can use following .bat file:

ffmpeg.exe -hide_banner -nostdin -loglevel fatal -stats -y -i %1 -filter_complex "[0]fps=15,split[v0][v1];[v0]palettegen=stats_mode=full[p];[v1][p]paletteuse" %~n1.gif

And to use new palette every frame to have more colors, but larger file size:

ffmpeg.exe -hide_banner -nostdin -loglevel fatal -stats -y -i %1 -filter_complex "[0]fps=15,split[v0][v1];[v0]palettegen=stats_mode=single[p];[v1][p]paletteuse=new=1" %~n1.gif

Put this line in make_gif.bat file, place ffmpeg executable next to it and then simply drag & drop .mp4 file on top of it. Change fps=15 to desired gif fps (or remove to use original video fps). Check the paletteuse filter arguments for different dither methods.

Building

To build the binary from source code, have Visual Studio 2019 installed, and simply run build.cmd.

Future plans

  • Maybe automatically handle default audio device changes when recording audio?
  • Maybe allow to capture & encode 10-bit pixel format when possible

Changelog

2021.12.21
  • allow to choose integrated vs discrete GPU to use for encoding
  • keep proper encoded video stream time when no new frames are captured
2021.12.18
  • fixed wrong audio timestamps when encoding audio
  • fixed wrong d3d11 calls to copy texture when size is odd
  • fixed hanging when encoding audio & video with too many dropped frames
2021.12.08
  • fixed compute shaders to work on older D3D11 hardware
2021.12.05
  • allow to selected limited vs full range for YUV conversion
2021.12.04
  • improved resizing and YUV conversion quality
  • improved performance for drawing background for rectangle selection
  • fix crash when child window is in foreground for window capture
2021.10.17
  • allow to configure keyboad shortcuts
2021.10.04
  • option to encode video with HEVC codec
  • option to encode audio with FLAC codec
  • allow limit file length or size
  • allow to choose output folder location
  • customize audio codec channels & samplerate
2021.09.25
  • allow to capture fixed position rectangle area on screen
  • prevent config dialog to be open multiple times
2021.09.20
  • added WASAPI loopback recording
  • audio is encoded using AAC codec
  • fix crash when capturing toolbar window
2021.09.19
  • initial release

License

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.

Open Source Agenda is not affiliated with "Wcap" Project. README Source: mmozeiko/wcap
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