AI video generated with no sound but credits charged: what actually happened
ai video generated no sound but credits charged
Silence can be the tariff, not a bug. On Doitong, audio is listed as included in the price for six models: Veo-3.1 Fast (1,500 credits, 8 s), Veo-3.1 Pro (2,000, 8 s), Hailuo H3 (3,375), Kling v2.6 (3,500), Seedance 2 Fast (6,200) and Seedance 2.0 (7,750). Seedance 1.5 and Kling V3 exist as separate "audio off" and "+ audio" entries; the audio-off entry costs roughly half and returns a silent file.
How this works
What to check first when the file is silent
Start by checking which entry you actually generated on, because the price list carries a documented case where the file comes back without a soundtrack by design. Seedance 1.5 and Kling V3 each appear twice: a separate "audio off" entry and a separate "+ audio" entry. In a picker the two lines look like the same model. Pick the audio-off line and you get the audio-off price and a picture without sound — that is what that line sells, and it is priced at roughly half of the "+ audio" one. Six models carry audio as part of the listed deliverable: Veo-3.1 Fast, Veo-3.1 Pro, Hailuo H3, Kling v2.6, Seedance 2 Fast and Seedance 2.0. If you need sound in the output, generating on one of those six is the direct route, and the next section gives the credit price for each. For any other model, open its entry in the picker and read what the listed price covers before you generate rather than after.
Which models list audio as included in the price
These are the models where sound is listed as part of the deliverable, with the credit cost of one standard generation: Veo-3.1 Fast, 1,500 credits, 8 seconds, with audio. Veo-3.1 Pro, 2,000 credits, 8 seconds, with audio. Hailuo H3, 3,375 credits, 768p, 5 seconds, with audio. Kling v2.6, 3,500 credits, 5 seconds, with audio. Seedance 2 Fast, 6,200 credits, 720p, 5 seconds, with audio. Seedance 2.0, 7,750 credits, 720p, 5 seconds, with audio. Veo-3.1 Fast is the cheapest entry on that list, and it matches Veo-3.1 Pro for the longest clip in the group at 8 seconds, for 500 credits less. The other four audio-inclusive models deliver 5 seconds. So if sound is non-negotiable and budget matters, Veo-3.1 Fast is the default pick. One honest caveat: this list describes what is priced in, not a quality ranking. If a model is not on this list, do not plan a soundtrack around it.
The audio-off variant is where silent files come from
Seedance 1.5 and Kling V3 exist in both flavours. The platform carries a separate "audio off" entry and a separate "+ audio" entry for each, and the audio-off entry is priced at roughly half of the "+ audio" one. That price gap is the situation described above. The cheaper line carries the model name you wanted, produces a correct video with no soundtrack, and the missing audio reads as a defect. It is not a defect — it is what that line sells. We do not publish the "+ audio" credit figure for these two entries on this page, so the honest advice is to compare the two lines side by side in the picker before you generate, rather than trying to reverse-engineer which one ran afterwards. All we state here is the relationship: audio off costs about half of "+ audio". Kling v2.6, separately, is listed as a single line at 3,500 credits with audio in the package. Seedance 1.5 appears in the standard price list at 2,500 credits for 720p; that figure is the standard listing and is not attributed here to either variant.
The numbers, in full
| Model | Credits per generation | Clip | Audio | USD on 30,000 / 100,000 / 300,000 pack |
|---|---|---|---|---|
| Veo-3.1 Fast | 1,500 | 8 s | Included in price | $1.00 / $0.60 / $0.50 |
| Veo-3.1 Pro | 2,000 | 8 s | Included in price | $1.33 / $0.80 / $0.67 |
| Hailuo H3 | 3,375 | 5 s, 768p | Included in price | $2.25 / $1.35 / $1.12 |
| Kling v2.6 | 3,500 | 5 s | Included in price | $2.33 / $1.40 / $1.17 |
| Seedance 2 Fast | 6,200 | 5 s, 720p | Included in price | $4.13 / $2.48 / $2.07 |
| Seedance 2.0 | 7,750 | 5 s, 720p | Included in price | $5.16 / $3.10 / $2.58 |
| Seedance 1.5 | 2,500 * | — | Sold as separate "audio off" and "+ audio" entries; audio off costs about half | — |
| Kling V3 | — | — | Sold as separate "audio off" and "+ audio" entries; audio off costs about half | — |
Credit packs: 30,000 for $19.99, 100,000 for $39.99, 300,000 for $99.99. Prices above are per generation at each pack rate.
The detail
What an audio-inclusive clip costs in dollars
Credits come in three packs: 30,000 for $19.99, 100,000 for $39.99 and 300,000 for $99.99 — roughly $0.67, $0.40 and $0.33 per 1,000 credits. Here is what one generation costs on each pack, smallest to largest: Veo-3.1 Fast (8 s): $1.00 / $0.60 / $0.50. Veo-3.1 Pro (8 s): $1.33 / $0.80 / $0.67. Hailuo H3 (5 s): $2.25 / $1.35 / $1.12. Kling v2.6 (5 s): $2.33 / $1.40 / $1.17. Seedance 2 Fast (5 s): $4.13 / $2.48 / $2.07. Seedance 2.0 (5 s): $5.16 / $3.10 / $2.58. Per second of finished footage on the 100,000-credit pack, that works out to about $0.08 for Veo-3.1 Fast, $0.10 for Veo-3.1 Pro, $0.27 for Hailuo H3, $0.28 for Kling v2.6, $0.50 for Seedance 2 Fast and $0.62 for Seedance 2.0 — the longer 8-second clips are the cheapest per second as well as per generation. The spread between the cheapest and the most expensive sound-included clip is 6,250 credits per generation: $4.16 on the 30,000 pack, $2.50 on the 100,000 pack and $2.08 on the 300,000 pack. Worth knowing before you queue a batch.
Duration and input limits that are easy to mistake for a fault
Two more limits are worth naming, since each one changes what comes back without changing what you pay. Duration is not uniform. Veo-3.1 Fast and Pro are listed at 8 seconds. Hailuo 2.3 delivers 6. Many of the rest deliver 5, which is why a clip that seems to cut off early can simply be the model's fixed length. Grok Video is billed per second instead: 350 credits per second at 480p and 450 credits per second at 720p. Input and framing limits are real too. The Seedance 2 family accepts no video input at all, so "my video won't upload" there is a capability limit rather than a fault. Seedance 2 also runs in 16:9, which is the answer to why a vertical render is not offered there. None of these cost less than the listed price, so check them before you spend a second generation.
The practical routine before you spend credits
Three checks, in order. First, confirm whether the model you chose lists audio as included. Six on this list do: Veo-3.1 Fast, Veo-3.1 Pro, Hailuo H3, Kling v2.6, Seedance 2 Fast and Seedance 2.0. Second, if you are on Seedance 1.5 or Kling V3, compare the two variants in the picker before you press generate. Both lines are visible with their own prices, and the cheaper one is silent by design. Third, match the clip length and aspect ratio to the model before generating, not after. Eight seconds comes from Veo-3.1 Fast and Pro, and 16:9 is what Seedance 2 works in. If sound is a hard requirement and you want the lowest predictable cost, Veo-3.1 Fast is the answer: audio is in the price, it is listed as a single entry with sound included, the clip is 8 seconds, and it runs $1.00 on the 30,000-credit pack, $0.60 on the 100,000 pack and $0.50 on the 300,000 pack.
Questions people ask next
My video came back silent. Does that mean the generation failed?
Not by itself. One documented case returns a file without a soundtrack by design: Seedance 1.5 and Kling V3 each carry a separate "audio off" entry priced at roughly half of the "+ audio" one, and the audio-off line delivers video with no sound. Six models list audio as part of the price: Veo-3.1 Fast (1,500 credits), Veo-3.1 Pro (2,000), Hailuo H3 (3,375), Kling v2.6 (3,500), Seedance 2 Fast (6,200) and Seedance 2.0 (7,750). Re-running on one of those is the fix.
Which model is the cheapest one with audio included?
Of the six models that list audio as included, Veo-3.1 Fast is the cheapest at 1,500 credits for an 8-second clip with audio. That is $1.00 on the 30,000-credit pack, $0.60 on the 100,000 pack and $0.50 on the 300,000 pack. It ties with Veo-3.1 Pro for the longest clip in that group at 8 seconds, while the other four audio-inclusive models deliver 5 seconds.
What is the difference between the Seedance 1.5 "audio off" and "+ audio" entries?
They are two separately priced entries for the same model. The audio-off entry costs roughly half of the "+ audio" one and returns video without a soundtrack. Seedance 1.5 appears in the standard price list at 2,500 credits for 720p, a figure we do not attribute here to either variant, and we do not publish the "+ audio" credit number on this page. Compare the two lines in the picker before generating rather than after.
Does Veo-3.1 Pro give better audio than Veo-3.1 Fast?
Both are listed as 8-second clips with audio included. Pro costs 2,000 credits against 1,500 for Fast. We do not publish a documented audio-quality difference between the two, so we will not claim one. What is verifiable is price and duration: same 8 seconds, 500 credits apart, which is $0.33 on the 30,000-credit pack, $0.20 on the 100,000 pack and $0.17 on the 300,000 pack.
Why does my clip stop after five seconds?
Because many models produce a fixed 5-second clip. Veo-3.1 Fast and Pro are listed at 8 seconds, Hailuo 2.3 delivers 6 seconds, and Grok Video is billed per second instead: 350 credits per second at 480p and 450 credits per second at 720p. Match the length you need to the model before generating, since the price is charged either way.
Can I upload my own video into Seedance 2 to add sound to it?
No. All three Seedance 2 variants accept no video input, so there is no path to feed an existing clip in. Seedance 2 also runs in 16:9, which is why vertical output is not offered there. If you need audio in the output, Seedance 2 Fast (6,200 credits, $2.48 on the 100,000-credit pack) and Seedance 2.0 (7,750 credits, $3.10) do list it as included.
Does Grok Video come with audio?
Audio is not listed among what Grok Video delivers, so do not plan a soundtrack around it. Grok is priced per second rather than per clip: 350 credits per second at 480p and 450 credits per second at 720p. That makes it a cheap way to test a short shot, but if the deliverable needs sound, use one of the six models where audio is listed in the price.
How do I convert credits into dollars myself?
Divide the pack price by the credits it contains, then multiply by the model's credit price. The packs are 30,000 credits for $19.99, 100,000 for $39.99 and 300,000 for $99.99, which is roughly $0.67, $0.40 and $0.33 per 1,000 credits. Use the pack price divided by its credit count rather than the rounded per-1,000 rate — on the smallest pack the rounded rate drifts by a cent or two on expensive models. Worked example: Kling v2.6 at 3,500 credits is $2.33, $1.40 and $1.17 across the three packs for a 5-second clip with audio.
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