Your movie subtitles are several seconds behind the dialogue because the caption file or broadcast track is timed late. A subtitle track is a separate text stream that is supposed to appear at the same time as each line is spoken. That is different from late sound, where Bluetooth or a soundbar delays the audio behind the picture. When words lag by full seconds, the cause is usually live captioning delay or a mismatched download.
Table of Contents
- Is the sound late or are the words late?
- Why do broadcast captions fall seconds behind?
- Can your TV settings fix late words?
- How do you resync subtitles you play yourself?
Is the sound late or are the words late?
In ITU research reported by TV Technology, lip-sync errors become detectable when audio leads video by 45ms or lags by 125ms. ATSC recommends even tighter sync of 30ms early to 90ms late, close to the old one-frame-early, two-frames-late rule.
Sony states Bluetooth delays sound behind the picture because audio must be encoded, transmitted and decoded, as explained in the Sony support note. TCL explains HDMI ARC and eARC miscommunication can desynchronize a TV and sound system, while Bluetooth to headphones adds transmission latency.
Why do broadcast captions fall seconds behind?
UK regulator Ofcom says live-subtitle delay should be minimized to no more than 3 seconds. Sampled BBC, ITV, Channel 4, Channel 5 and Sky broadcasts showed median 5.6-second latency, according to the Ofcom study report.
That gap affects over a million hearing-impaired viewers. BBC Research found live subtitles arrive a few seconds late in broadcast and demonstrated realigning them with automatic text-alignment for on-demand playback, described in the BBC R&D paper.
Can your TV settings fix late words?
Often the delay is baked into the program feed. BBC R&D and Ofcom evidence notes viewer TV settings cannot fix a late subtitle track; only the broadcaster re-timing it can.
Sony advises checking the ARC or eARC HDMI connection, setting Digital Audio Out to PCM, and adjusting the A/V-sync delay for sound-system delay. Those controls move sound, not baked-in captions, so leave them alone when only the words are late.
How do you resync subtitles you play yourself?
If the movie is a file you play yourself, you can shift the subtitle track. VideoLAN documents pressing G or H during VLC playback to shift subtitle timing in 50ms steps, or entering an exact millisecond offset, in the VideoLAN guide.
Note the offset for that release, because the same file will need the same shift each time. If captions come from live TV or a locked streaming app, save no offset; report the delay to the broadcaster.
- Press G or H during playback to shift subtitle timing in 50ms steps
- Repeat until captions line up with speech
- Enter an exact millisecond offset for a large several-second gap