Videos are shrunk on the phone before upload; nostr.build is the first media host.

No public Blossom host transcodes (nostr.build's and primal's BUD-05 /media
return the same bitrate), so a 15-20 Mbps phone clip stalled on playback.
src/video-compress.js re-encodes on the device with WebCodecs via
Mediabunny (a lazily loaded chunk, left out of the SW precache and the
standalone file): H.264, short edge 720, ~2.5 Mbps, moov first, audio
passed through, rotation baked in. Anything short of a clear win uploads
the original. A toast counts the shrinking down.

Media hosts: blossom.nostr.build first, nostr.download second (it was
unreachable for hours); a HEAD probe skips a host that doesn't answer
within 5 s instead of waiting out the whole upload timeout.

video-compress-test: 1080p 20 Mbps 5 s (landscape and rotated portrait) →
1.6 MB H.264 720p 2.49 Mbps with audio, moov first, in 2-3 s.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Du1qT1wbkYwYK6zkGH79Rp

1 files changed, 11 insertions, 0 deletions

diff --git a/src/app.js b/src/app.js
index 0bf3086..5b0bdb6 100644
--- a/src/app.js
+++ b/src/app.js
@@ -3483,6 +3483,17 @@ async function onbUpload(file) {
 }
 
 async function publicMediaUpload(file) {
+  // a phone video is shrunk on the device first (see video-compress.js);
+  // the toast counts it down, since a long clip takes a while
+  if (/^video\//.test(file?.type || '')) {
+    let shown = -1;
+    const { compressVideo } = await import('./video-compress.js');
+    file = await compressVideo(file, (p) => {
+      const pct = Math.floor(p * 100);
+      if (pct !== shown && pct % 5 === 0) { shown = pct; toast(t('mediaShrinking', { pct }), 60_000); }
+    });
+    if (shown >= 0) toast(t('mediaUploading'), 4000);
+  }
   try {
     return await uploadPublicMedia(file, (event) => wallet.nostrSign(event));
   } catch (error) {