Closes the loop on 4.6.13 auto-resume. A streamlink restart between
two parts produces N separate .mp4 files for what is logically a
single recording, which is fine for reliability but inconvenient
for watching back. Opt-in flag flips that into a single stitched
file post-recording.
concatVideoFiles(inputs, output) writes a temp concat list and runs
ffmpeg with the concat demuxer in copy mode — no re-encode, the
parts get container-stitched in seconds even for multi-hour
recordings. The merged output is named "{base}_merged.mp4" so it
sits next to the parts without colliding.
Two independent toggles:
- auto_merge_resumed_parts (off by default) — runs the merge.
- delete_parts_after_merge (off by default) — drops the originals
ONLY if the merge produced a non-zero output file. Default-off
means even if ffmpeg silently produced garbage, the parts stay
around as the source of truth.
If concat fails for any reason (corrupt segment header, codec
mismatch from a stream that changed quality mid-recording, missing
ffmpeg) the failure is non-fatal: we delete the half-written
merged file and keep the parts. The user always has the original
recordings.
Settings card adds the two checkboxes nested under the existing
auto-resume toggle so the relationship is visually obvious.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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