The FBK Sentence-Aware Subtitling System at the IWSLT 2026 Subtitling Track

Mauro Cettolo, Roldano Cattoni, Matteo Negri, Luisa Bentivogli


Abstract
This paper describes the FBK submissions to the Subtitling track of the 2026 IWSLT Evaluation Campaign. The task requires automatically subtitling English audio-visual content across three domains (ITV entertainment series, Asharq-Bloomberg news programs, and YouTube recordings from the YODAS dataset), into up to four target languages per domain, chosen from a pool of five (Arabic, Chinese, German, Japanese, and Spanish). All submitted systems are based on an ASR-MT cascade framework built exclusively from freely available open-source components usable without restrictions, including for commercial purposes. Our primary system implements a two-stage pipeline: the first stage produces time-aligned subtitles via voice activity detection, automatic transcription, and subtitle-level translation, while the second refinement stage re-processes the audio at a longer context level, combining long-form transcription with sentence-level translation, and re-aligning the resulting output to the original subtitle timing. This design preserves synchronization constraints while leveraging broader context to improve both transcription and translation quality. We also submitted two contrastive systems: one corresponding to the first-stage baseline pipeline, and another sharing the same baseline architecture but using alternative components.
Anthology ID:
2026.iwslt-1.7
Volume:
Proceedings of the 23rd International Conference on Spoken Language Translation (IWSLT 2026)
Month:
July
Year:
2026
Address:
San Diego, USA (in-person and online)
Editors:
Elizabeth Salesky, Antonios Anastasopoulos, Matteo Negri, Marcello Federico
Venues:
IWSLT | WS
SIG:
SIGSLT
Publisher:
Association for Computational Linguistics
Note:
Pages:
68–77
Language:
URL:
https://aclanthology.org/2026.iwslt-1.7/
DOI:
Bibkey:
Cite (ACL):
Mauro Cettolo, Roldano Cattoni, Matteo Negri, and Luisa Bentivogli. 2026. The FBK Sentence-Aware Subtitling System at the IWSLT 2026 Subtitling Track. In Proceedings of the 23rd International Conference on Spoken Language Translation (IWSLT 2026), pages 68–77, San Diego, USA (in-person and online). Association for Computational Linguistics.
Cite (Informal):
The FBK Sentence-Aware Subtitling System at the IWSLT 2026 Subtitling Track (Cettolo et al., IWSLT 2026)
Copy Citation:
PDF:
https://aclanthology.org/2026.iwslt-1.7.pdf