Please add full lavcodec support for decoding and DXVA2 for displaying videos

[AmBintroGoof99]

The fewer issues I have to read, the more new features I will have time to implement, so I ask that you please try these things first

• Check out all the menus and keyboard shortcuts. Maybe the feature already exists?
• Try with the newest version from GitHub
• Read the documentation and FAQ, Known issues, Troubleshooting to see if the feature already exists
• See if someone already suggested this under Issues or Discussions

Description

Hi! First of all, I’d like to thank the owner/developer of this program for the wonderful work. LosslessCut is one of my most favorite programs to cut and trim videos with. And one thing I especially like about it is that it supports pretty much every format that FFmpeg does, including preserving Dolby E audio tracks on .ts and .mxf files. No other program does that as seamlessly and as smoothly as LosslessCut does.

However, the HTML5 player on LC is limiting the app so much and making it often very hard to use due to the horrid playback when seeking files, even when they are “compatible” formats. PLEASE, if it is possible (am pretty sure it is) ditch it in favor of full-blown lavcodec decoding and DXVA2 display support as default instead. Avidemux does this, and videos play back buttery smooth even on very slow computers. I think this may even fix the issue where LC was either a frame behind or ahead in comparison to Avidemux and VirtualDub2, which can cause inaccurate cuts. If this is implemented, LosslessCut will really be able to compete with programs like VideoReDo because it’s already so great, but lacks this feature and a couple more.

Thanks again for everything, and I hope this makes it to the next release.

[mifi]

Hi and thanks for your feedback. This has been discussed before (#88), but the problem is that I haven't found an easy way to replace the HTML5 player with anything with a similar API. However in Electron/Chromium, the HTML5 video player already uses lavcodec for playback. As I understood it, the problem is that it has been compiled only to support certain codecs and formats (those that are open source compatible, e.g. no patents etc). So it would be theoretically possible to re-compile Electron and include a lot of extra codecs for playback, however practically I don't know how to achieve that. A lot of other people want this too, but nobody has yet found a solution:

• Support for proprietary codecs electron/electron#633
• Provide ffmpeg.so file that plays all common videos electron/electron#9534

If someone want to look into it, then I'm open to setting up a custom Electron build system, but I don't have the resources or knowledge to work on that unfortunately. So there's nothing actionable here for me so I'm going to close this.