Carlos Solís

Sorry for the delay, here's a debug file of my testing: [ffmpeg-debug.txt](https://github.com/mpv-player/mpv/files/4296369/ffmpeg-debug.txt)

An upgrade later, and using the trick you proposed, I still can't capture more than a frame: ``` `"C:\Program Files\mpv\mpv.com" av://gdigrab:desktop --demuxer-lavf-hacks=no --no-config [ffmpeg/demuxer] gdigrab: Custom AVIOContext makes no sense...

A more verbose output: [mpv-no-config.txt](https://github.com/mpv-player/mpv/files/4327982/mpv-no-config.txt)

Just to confirm: does the fix require patching the source code, or is there a workaround I can use in the command line launch parameters?