Ok, so probably __pycache__-folder and renaming cause some strange confusion in settings and hangs. Now everything works as before.
Here are some further tests about empty frame in MP4. That problem is really strange and may be reproduced in some different ways. And yes, seems it may depend of source file itself. It seems problem somehow depends of muxing with audio track and 44.1Hz recognized as separate music track with cover preview but not as part of video file.
- MP4box in Hybrid may add additional empty first frame in Hybrid.
- In Hybrid problem appears when i force set audio sample rate to 44.1Hz
- You can see one frame difference if compare source and rendered MP4 file with some MedIaInfo.
- First empty frame visible in QuickLook as transparent frame or in QuickTime X player as black frame on macOS.
- First empty frame is not visible in VLC player on macOS.
- Problem related only to MP4 container (no problem with MKV or MOV container).
- Problem don't depend of h264/h265 settings.
- No problem when use MP4box but renderer only video track without audio track.
- No problem when use FFmpeg muxer instead of MP4box in Hybrid.
- Problem also may be reproduced in HandBrake (but not exact the same)
- In HandBrake problem appears when source file is 44.1Hz and render audio sample rate also force set to 44.1Hz
- Also in Handbrake Problem appears when used variable frame rate option.
- In HandBrate empty frame may be visible but same time MediaInfo may show exact same frame count as source.
Quote:In old version of Hybrid if i enable "Config->Output->Mp4 Settings->FFmpeg instead of MP4Box" i notice something like "jumping framerate effect" or 'wrong field list order effect", but it was only visible in macOS quicklook preview. In VLC player video played back smooth.
In Updated Hybrid seems there is no more "jumping framerate effect" when i use FFmpeg for MP4