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/*
This file is part of jellything (https://codeberg.org/metamuffin/jellything)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2025 metamuffin <metamuffin.org>
*/
use crate::LOCAL_VIDEO_TRANSCODING_TASKS;
use jellybase::{
cache::{async_cache_file, CachePath},
common::stream::{StreamFormatInfo, TrackKind},
CONF,
};
use log::{debug, info};
use std::process::Stdio;
use tokio::{
io::copy,
process::{ChildStdin, Command},
};
// TODO odd video resolutions can cause errors when transcoding to YUV42{0,2}
// TODO with an implementation that cant handle it (SVT-AV1 is such an impl).
pub async fn transcode(
kind: TrackKind,
format: &StreamFormatInfo,
input_key: &str,
input: impl FnOnce(ChildStdin),
) -> anyhow::Result<CachePath> {
let template = match format.codec.as_str() {
"V_MPEG4/ISO/AVC" => CONF.encoders.avc.as_ref(),
"V_MPEGH/ISO/HEVC" => CONF.encoders.hevc.as_ref(),
"V_VP8" => CONF.encoders.vp8.as_ref(),
"V_VP9" => CONF.encoders.vp9.as_ref(),
"V_AV1" => CONF.encoders.av1.as_ref(),
_ => None,
}
.or(CONF.encoders.generic.as_ref())
.cloned()
.unwrap_or("ffmpeg %i %f %e %o".to_owned());
let filter = match kind {
TrackKind::Video => format!("-vf scale={}:-1", format.width.unwrap()),
TrackKind::Audio => String::new(),
TrackKind::Subtitle => String::new(),
};
let typechar = match kind {
TrackKind::Video => "v",
TrackKind::Audio => "a",
TrackKind::Subtitle => "s",
};
let fallback_encoder = match format.codec.as_str() {
"A_OPUS" => "libopus",
"V_VP8" => "libvpx",
"V_VP9" => "libvpx-vp9",
"V_AV1" => "libaom", // svtav1 is x86 only :(
"V_MPEG4/ISO/AVC" => "libx264",
"V_MPEGH/ISO/HEVC" => "libx265",
_ => "",
};
let args = template
.replace("%i", "-f matroska -i pipe:0 -copyts")
.replace("%o", "-f matroska pipe:1")
.replace("%f", &filter)
.replace("%e", "-c:%t %c -b:%t %r")
.replace("%t", typechar)
.replace("%c", fallback_encoder)
.replace("%r", &(format.bitrate as i64).to_string())
.replace(" ", " ");
async_cache_file("frag-tc", (input_key, &args), async |mut output| {
let _permit = LOCAL_VIDEO_TRANSCODING_TASKS.acquire().await?;
debug!("transcoding fragment with {format:?}");
info!("encoding with {:?}", args);
let mut args = args.split(" ");
let mut proc = Command::new(args.next().unwrap())
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.args(args)
.spawn()?;
let stdin = proc.stdin.take().unwrap();
let mut stdout = proc.stdout.take().unwrap();
input(stdin);
copy(&mut stdout, &mut output).await?;
proc.wait().await.unwrap().exit_ok()?;
info!("done");
Ok(())
})
.await
}
|
