Listen to the source segment and the same line in the final video
Choose an information-bearing sentence with a name, cause or negation, such as “He did not take the key.” Listen without captions, then check with them. If the negation is only recoverable from captions, aligned duration is not enough to adopt the sound.
| What you hear | What to check first |
|---|---|
| The source is rushed too | Information density, delivery and controls supported by the selected engine. |
| The source is clear but the whole video is rushed | Additional global acceleration during assembly. |
| Only one final line is rushed | Local acceleration to fit a shorter picture window. |
| Speech is clear but picture moves to the next action | Revise the window; this alone does not justify more acceleration. |
Slowing preview playback can help diagnosis, but the export may still use the original processing. Keep the generated segment and compare the same line in a new candidate export.
Specify generation delivery and assembly speed separately
The native method records generation rate requests, global speed and segment fitting separately. The legacy assembly path has a global speed default. Explicitly adopted narration instead follows an independently selected tempo policy, which ambient defaults cannot override.
A useful request is: “Keep this audio I have listened to. Do not globally accelerate it or speed individual segments to squeeze them into windows. If complete speech does not fit, identify the picture interval that needs revision. Do not cut the tail or change approved words.” An adoption can express these choices as global_atempo: 1.0 and bounded_segment_fit: false. The former keeps the input’s speed during assembly; it cannot repair an already rushed input.
If the source itself is too fast, revise generation. The repository handles engines differently: some use their own default controls, while some translate rate requests into delivery instructions. Do not promise that every engine implements an exact ten-percent reduction. Generate a candidate of the same line, listen, and choose. Extra exclamation marks or ellipses can also change tone and pauses; they are not a reliable universal speed dial.
Complete example: make the negation audible
This is a paper teaching example; no audio was generated or auditioned for this article. In the original picture, Lin Che withdraws his hand from a counter while the key remains on a white dish. The approved line is “He did not take the key. He only changed the borrowing time to tomorrow morning.” Assume the author finds the generated segment clear but hears a rushed negation in the final video.
The example’s records show a six-second input, a seven-second picture window including a previously designed one-second end pause, and additional global acceleration of 1.15 during assembly. Ideal division gives 6 ÷ 1.15, approximately 5.22 seconds. This explains the speed change; it is not a measured export or proof that any particular word becomes unclear. No additional segment acceleration was recorded, so do not invent it as a cause.
The author chooses the source sound, sets assembly speed to 1.0, disables additional segment fitting, and makes a candidate. The paper arrangement retains the seven-second window, allowing the full six-second sound followed by its previously designed one-second pause. Captions are positioned against the actually adopted sound, rather than the estimated 5.22 seconds. The hand still withdraws and the key stays put; no taking action is added to hurry the line.
If real footage offers only five seconds, six seconds of complete speech cannot also fit at its original speed. The author first decides whether to extend or rearrange picture. If picture is fixed but words may change, propose a shorter candidate preserving the negation and tomorrow’s borrowing arrangement, then regenerate after approval. If words are fixed too, the native explicit adoption policy blocks the overlong segment instead of secretly accelerating or cutting words.
Listen to the new final video. Check the negation, name and ending, the unchanged key in picture, and captions against that selected sound. These are diagnosis and choice steps, not a claim that the paper arrangement has passed an audio-quality test.
Listen to the sound you actually adopt
Change one identified stage, then compare the same line. Changing voice, text, speed and picture together makes the cause harder to assess. Keep the approved words linked to the selected sound. Speed changes affect captions and original-audio overlap; check that endings do not cover dialogue or action sounds that must remain audible.
Native records show which inputs and tempo policy entered assembly. They do not replace listening or prove provider identity, natural delivery or release approval. A speed below a configured limit is not a guarantee of intelligibility. Dense names, information jumps or long sentences may require an author-approved text revision.
For speech that exceeds picture duration, see fitting voiceover to picture. For an altered voice after acceleration, see speed and pitch checks. This page focuses on locating rushed speech and selecting a version listeners can understand.
FAQ
Does 1× guarantee natural speech?
No. It avoids additional global acceleration during assembly. A rushed input still needs revised delivery, regeneration and listening.
What if slower speech no longer fits?
First consider a picture revision. If words may change, approve a shorter version and regenerate. If both are locked, do not secretly speed up or truncate the sentence.
Do it with the skill
Assembly places segment audio under a tempo policy. Locate generation, global speed and local fitting, select the sound, then check the final video.
Read the method: Engine-specific generation rate handling · Global speed and cumulative tempo budget · Separate global acceleration and segment fitting · Explicit adopted tempo policy and listening limits