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fix(export): encode WebM audio packets in place instead of draining each from the front

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This commit is contained in:
Dylan M. Taylor
2026-11-03 14:42:25 +00:00
parent 7870b5916a
commit d7ffb95374
2 changed files with 10 additions and 6 deletions
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crates/export/src/webm.rs
+5 -3
View File
@@ -244,12 +244,14 @@ pub(crate) async fn webm(job: &Cx<'_>, comp: &Comp, w: u32, h: u32, st: &mut Sta
let pad = (fs - pcm_left.len() % fs) % fs + fs;
pcm_left.extend(std::iter::repeat_n(0.0, pad));
}
while pcm_left.len() >= fs {
let pkt = enc.encode_float(&pcm_left[..fs]);
pcm_left.drain(..fs);
// Packets are read in place and the encoded samples dropped once: draining each packet
// from the front would shift the rest of the batch's audio every 20 ms.
for packet in pcm_left.chunks_exact(fs) {
let pkt = enc.encode_float(packet);
frames.push(Frame { ms: packets as i64 * 20, track: 2, key: true, prev_ms: None, data: pkt, alpha: None });
packets += 1;
}
pcm_left.drain(..pcm_left.len() / fs * fs);
};
let batch = batch_size();
crates/export/src/webm_av1.rs
+5 -3
View File
@@ -124,12 +124,14 @@ pub(crate) async fn webm_av1(job: &Cx<'_>, comp: &Comp, w: u32, h: u32, st: &mut
let pad = (fs - pcm_left.len() % fs) % fs + fs;
pcm_left.extend(std::iter::repeat_n(0.0, pad));
}
while pcm_left.len() >= fs {
let pkt = enc.encode_float(&pcm_left[..fs]);
pcm_left.drain(..fs);
// Packets are read in place and the encoded samples dropped once: draining each packet
// from the front would shift the rest of the batch's audio every 20 ms.
for packet in pcm_left.chunks_exact(fs) {
let pkt = enc.encode_float(packet);
blocks.push(Block { ms: packets as i64 * 20, track: 2, key: true, data: pkt });
packets += 1;
}
pcm_left.drain(..pcm_left.len() / fs * fs);
};
let batch = batch_size();