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fix(tts): scope retranslation TTS to target language only

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When retranslate=True, _generate_tts_for_languages was receiving
the full outputs dict (all 9 languages) and regenerating TTS + render
for every language on every single-language retranslation task.
That multiplied API calls by 8x and triggered unnecessary renders.

Now passes only the target language outputs when retranslate=True.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Vadym Samoilenko 2026-05-07 16:57:20 +01:00
parent b873f0af6d
commit f38325b461
1 changed files with 8 additions and 1 deletions
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9
backend/app/tasks/translate_and_synthesize.py
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@ -312,8 +312,15 @@ async def _async_translate_and_synthesize(job_id: str, languages: list[str] | No
if job_doc["requested_outputs"]["audio_description_mp3"]:
# Get TTS preferences from job
tts_preferences = job_doc["requested_outputs"].get("tts_preferences", {})
# For retranslation, only regenerate TTS for the specific target languages —
# not all languages. Regenerating all is wasteful and triggers unwanted renders.
tts_outputs = (
{lang: updated_outputs[lang] for lang in target_languages if lang in updated_outputs}
if retranslate
else updated_outputs
)
await _generate_tts_for_languages(
job_id, updated_outputs, db, source_language, tts_preferences, accessible_video_requested,
job_id, tts_outputs, db, source_language, tts_preferences, accessible_video_requested,
user_id=_cost_ctx["user_id"], cost_project_id=_cost_ctx["project_id"],
)