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prevent short hls segments by extending clip backwards

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This commit is contained in:
Josh Hawkins 2026-03-06 08:42:15 -06:00
parent ab3cef813c
commit e1f53e2d14
1 changed files with 18 additions and 0 deletions
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18
frigate/api/media.py
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@ -870,6 +870,7 @@ async def vod_ts(
clips = []
durations = []
min_duration_ms = 100 # Minimum 100ms to ensure at least one video frame
min_hls_segment_ms = 2000 # Minimum 2s for HLS playback compatibility
max_duration_ms = MAX_SEGMENT_DURATION * 1000
recording: Recordings
@ -900,6 +901,23 @@ async def vod_ts(
if recording.end_time > end_ts:
duration -= int((recording.end_time - end_ts) * 1000)
# if segment is too short and was trimmed by clipFrom, pull clipFrom back
# to ensure a minimum playable segment length for HLS compatibility
# if segment is too short for reliable HLS playback and was trimmed
# by clipFrom, pull clipFrom back to ensure a minimum playable length
if duration < min_hls_segment_ms and "clipFrom" in clip:
shortage = min_hls_segment_ms - duration
new_inpoint = max(0, clip["clipFrom"] - shortage)
gained = clip["clipFrom"] - new_inpoint
clip["clipFrom"] = new_inpoint
duration += gained
logger.debug(
"VOD: extended clip %s by pulling clipFrom back to %sms, duration now %sms",
recording.path,
new_inpoint,
duration,
)
if duration < min_duration_ms:
# skip if the clip has no valid duration (too short to contain frames)
logger.debug(