feat: improve recording recovery and upload workflow

scripts/build-fnos-package.sh

@@ -2,7 +2,7 @@
 set -euo pipefail
 
 ROOT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
-VERSION=1.2.13
+VERSION=1.2.19
 OUTPUT="${1:-$ROOT_DIR/artifacts/fnos/liverecorder-${VERSION}-x86_64.fpk}"
 WORKSPACE_CACHE=$(CDPATH= cd -- "$ROOT_DIR/.." && pwd)
 DOTNET_BIN="${DOTNET:-$WORKSPACE_CACHE/.dotnet8/dotnet}"

scripts/smoke-short-fragment-merge.sh

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+command -v ffmpeg >/dev/null || { echo "ffmpeg is required" >&2; exit 127; }
+command -v ffprobe >/dev/null || { echo "ffprobe is required" >&2; exit 127; }
+
+test_dir="$(mktemp -d)"
+trap 'rm -rf "$test_dir"' EXIT
+
+make_sample() {
+  local output="$1"
+  local duration="$2"
+  ffmpeg -hide_banner -loglevel error \
+    -f lavfi -i "testsrc2=size=320x180:rate=25" \
+    -f lavfi -i "sine=frequency=1000:sample_rate=48000" \
+    -t "$duration" -c:v libx264 -preset ultrafast -pix_fmt yuv420p \
+    -c:a aac -b:a 96k -movflags +faststart -y "$output"
+}
+
+make_sample "$test_dir/short-a.mp4" 1.2
+make_sample "$test_dir/short-b.mp4" 2.1
+make_sample "$test_dir/normal.mp4" 6.4
+
+run_case() {
+  local name="$1"
+  local minimum_duration="$2"
+  shift 2
+  local list="$test_dir/$name.txt"
+  local output="$test_dir/$name.mp4"
+  : > "$list"
+  for source in "$@"; do
+    printf "file '%s'\n" "$source" >> "$list"
+  done
+
+  ffmpeg -hide_banner -loglevel error -f concat -safe 0 -i "$list" \
+    -map 0 -c copy -movflags +faststart -y "$output"
+
+  local duration
+  duration="$(ffprobe -v error -show_entries format=duration -of default=nw=1:nk=1 "$output")"
+  local video_streams
+  video_streams="$(ffprobe -v error -select_streams v:0 -show_entries stream=index -of csv=p=0 "$output" | wc -l)"
+  awk -v actual="$duration" -v minimum="$minimum_duration" 'BEGIN { exit !(actual >= minimum) }'
+  test "$video_streams" -ge 1
+  echo "$name ok: duration=${duration}s"
+}
+
+run_case short_then_normal 7.0 "$test_dir/short-a.mp4" "$test_dir/normal.mp4"
+run_case normal_then_short 7.0 "$test_dir/normal.mp4" "$test_dir/short-a.mp4"
+run_case consecutive_shorts 9.0 "$test_dir/short-a.mp4" "$test_dir/short-b.mp4" "$test_dir/normal.mp4"