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Wayland: VAAPI H.264 + in-process HTTP server, drop ffmpeg

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The previous ffmpeg-as-HTTP-server pipeline shape held back two
improvements at once. ffmpeg as the runtime server lost a one-shot
`-listen 1` accept to a probe-and-discard health check, and forced
us to size analyze/probe budgets carefully so ffmpeg would serve
before our deadline. Replacing it with a small tokio task that
accepts once, drains the HTTP request, writes a fixed 200 OK, then
`tokio::io::copy`s gst stdout to the socket removes all of that.

VAAPI H.264 (vah264enc) drops CPU encode from ~50% of a core to
single-digit %. An earlier attempt at vaav1enc had to be abandoned:
libavformat cannot demux AV1-in-MPEG-TS with the custom mapping
even with a 20MB probe budget — mpv reports video=eof. H.264 keeps
the hardware win on the well-trodden demuxer path.

scripts/smoke-pipeline.sh mirrors the runtime pipeline with
videotestsrc/audiotestsrc into a file and asserts that mpv reports
`video=playing` (not video=eof). The naive --frames=10 check was
a false positive when no video stream is recognized; the verbose
grep is the real gate.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Mollusk
2026-05-18 02:29:56 -04:00
parent 75a01a361e
commit 7b8b6bcd0c
3 changed files with 150 additions and 93 deletions
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src/common/deps.rs
+7 -9
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@@ -5,12 +5,11 @@ use std::process::Command;
use crate::common::display::DisplayServer;
pub fn check_host_binaries(display: DisplayServer) -> Result<()> {
require("ffmpeg")?;
if display == DisplayServer::Wayland {
require("gst-launch-1.0")?;
require("gst-inspect-1.0")?;
require_gst_element("pipewiresrc")?;
require_gst_element("x264enc")?;
require_gst_element("vah264enc")?;
require_gst_element("h264parse")?;
require_gst_element("mpegtsmux")?;
require_gst_element("pulsesrc")?;
@@ -56,7 +55,6 @@ fn which(bin: &str) -> Option<PathBuf> {
fn install_hint_for_bin(bin: &str) -> String {
let distro = detect_distro();
let pkg = match bin {
"ffmpeg" => "ffmpeg",
"gst-launch-1.0" | "gst-inspect-1.0" => match distro.as_deref() {
Some("arch" | "cachyos" | "manjaro" | "endeavouros") => "gstreamer gst-plugins-base",
Some("debian" | "ubuntu" | "pop" | "linuxmint") => "gstreamer1.0-tools",
@@ -78,12 +76,12 @@ fn install_hint_for_gst_element(name: &str) -> String {
Some("opensuse" | "opensuse-tumbleweed" | "opensuse-leap") => "pipewire-gstreamer",
_ => "the GStreamer PipeWire plugin",
},
"x264enc" => match distro.as_deref() {
Some("arch" | "cachyos" | "manjaro" | "endeavouros") => "gst-plugins-ugly",
Some("debian" | "ubuntu" | "pop" | "linuxmint") => "gstreamer1.0-plugins-ugly",
Some("fedora" | "nobara") => "gstreamer1-plugins-ugly",
Some("opensuse" | "opensuse-tumbleweed" | "opensuse-leap") => "gstreamer-plugins-ugly",
_ => "the GStreamer x264 plugin",
"vah264enc" => match distro.as_deref() {
Some("arch" | "cachyos" | "manjaro" | "endeavouros") => "gst-plugin-va",
Some("debian" | "ubuntu" | "pop" | "linuxmint") => "gstreamer1.0-plugins-bad",
Some("fedora" | "nobara") => "gstreamer1-plugins-bad-free",
Some("opensuse" | "opensuse-tumbleweed" | "opensuse-leap") => "gstreamer-plugins-bad",
_ => "the GStreamer VA-API plugin (requires an H.264-capable GPU; almost all modern GPUs)",
},
"h264parse" | "mpegtsmux" | "aacparse" => match distro.as_deref() {
Some("arch" | "cachyos" | "manjaro" | "endeavouros") => "gst-plugins-bad",