Hi, I tested HereSphere a lot for a few weeks on a lot of files, and I have now bought it. Previously I used Pigasus, DeoVR, and Whirligig. I think HereSphere seems to have the best projection (easier to look to the far left and right side of vr180 without weird visual problems). Although I still think Pigasus is the best for robust playback of a variety of files (including with subtitles), and DeoVR had the best user interface (seamless switch to lying-down mode; the primary-secondary controller customization model with the ability to easily switch hands for primary). But DeoVR doesn't support SMB, and after the an OS update Pigasus started crashing frequently; hence I tried HereSphere.
I could think of a lot of minor feedback and feature suggestions, but for now I will limit myself to the a few things that seemed most "bug-like" (problematic), in my opinion. But I think I didn't encounter that much that was really problematic, only a few issues:
1) I have full SBS videos with names ending in _LRF.sbs.[the file extension] that play OK in Pigasus Full SBS mode (which is automatically selected since the 'F' in the filename is for Full), but in HereSphere the auto-detected aspect ratio is twice as wide as it should be, presumably because the file is assumed to be Half SBS.
I know that I can manually change the aspect ratio, but it is tedious to do so because I have many files and some of them are 4:3 and some of them are 16:9 (and others could be something else).
What I really need, I think, since the videos appear to be twice as wide as they should be, is the option to choose the ratio [0.5 * the_current_auto-detect] wide by [the_current_auto-detect] high, for Full SBS. Could you add something like this either to the list of aspect ratio options or the 3D mode selection (Pigasus puts it in the latter, but putting it in the Aspect Ratio options is also a sane choice since that's what it's about, really).
More importantly, is there an existing file name name convention I can use for this? Or can you add one? I was just using 'F' because that's what I got from the Pigasus documentation, but it's no big deal for me to rename the files; I can rename them easily with a .bat script or something.
2) I have .webm (VP9 + Opus) files that I got with yt-dlp. All of them will stop playing very near the end of the video: it will not advance to the next video, nor will the video repeat if the repeat option is selected. It is effectively glitch-paused even though the player is in play mode. The only option is to manually invoke Next Media command. As far as I can tell it is like this for all of my .webm files. The videos play fine (including with the repeat function) in Pigasus with libvlc.so, DeoVR and, on PC, SMPlayer with mpv engine, and PotPlayer (probably also in the latest VLC but I didn't test).
But I guess you know that there are some problems with HereSphere's player backend because I read something about that in your FAQ. I have some obsolescent formats like Microsoft .wmv that won't play at all in HereSphere :-( I also had some problems with some common pedestrian codecs like AVC+AAC in .mkv, like green pixelated blocks all over the screen or sound randomly not playing, but they seem rare so far - so far I only encountered them in one of my folders (but they play OK in Pigasus et al.). So I hope you will be able to offer the option of a more robust decoding engine sometime down the road (like libvlc.so or whatever).
But I mention this because VP9 + Opus in .webm is not a particularly obscure or obsolescent format, as it is widely used on YouTube.
3) I hope that in the future you will be able to support the option of viewing single images (which are basically 1-frame videos). Most importantly JPEG, obviously. (But PNG and GIF would be cool, too.) I have a lot of vr180 photos.