MediaRiffle v0.7.0

✨ Features and improvements

• Proxmox LXC template: each release has MediaRiffle-v<version>-proxmox-amd64.tar.zst, Proxmox's Ubuntu 24.04
  template with MediaRiffle, ffmpeg and the Intel/AMD GPU drivers installed, listening on port 5080; a container made
  from it sets itself up at first boot (port and trusted proxies from /etc/mediariffle/firstboot.env). Built and
  boot-tested by the release pipelines (GitLab's on the Linux runner). See docs/proxmox.md, which also covers passing in
  a media share and the host's GPU.
• Decoding on the GPU: with a GPU encoder (Qsv, Vaapi, Nvenc), video is decoded and scaled on that GPU too,
  so the picture never leaves it: a 4K file converted about 3.5 times faster on an Intel laptop's GPU. With Vaapi
  (Linux), HDR and Dolby Vision are tone-mapped there with libplacebo, through Vulkan. What the GPU decodes is found
  out at start and logged; anything else, a stream the GPU fails on, and burned-in subtitles are decoded on the CPU as
  before. Transcoding:HardwareDecoding turns it off. See docs/configuration.md.
• Play in VLC: under the player, Play in VLC… opens the file as it is in VLC, from where you are (on Android and
  an iPhone or iPad the VLC app opens; on a computer a small .m3u playlist is saved, or copy the link into VLC's Open
  Network Stream). VLC decodes everything itself (4K HEVC, HDR, Dolby Vision, TrueHD), so the server only reads the
  file. The link carries its own key, works for 24 hours, and isn't offered to an account with a quality cap.
• Smoother 4K played as it is: the browser keeps less of what's already played of a high-bitrate stream, so its
  limited room goes to what's ahead.

🐞 Bug fixes

• Av sync (!20) (@acalcutt)
• The Cast button shows again: Google's own button hid itself until Chrome had found a Chromecast. The player
  and the music bar now have a Cast button of their own, always there in Chrome and Edge (on HTTPS), which opens
  Chrome's Cast dialog and reads "Casting" while casting. "Watching on a TV…" moved out of the controls, under the
  player with Play in VLC….
• Sound out of sync after a seek, resume or subtitle change: a file played as it is (copied video, as 4K HEVC
  is) and started part-way through had its sound a second or more early, and text subtitles late. Copied video
  starts at a keyframe before the time; the sound now starts there with it, and the player's clock knows where.
  (Seeking to that keyframe itself had made ffmpeg land on the one before it.)