PopNowAPI 文件
主要內容

LTX-2 19B API 呼叫參考

20 秒影片，人聲、音樂和音效齊全

只要一把 PopNow API 金鑰，就能在自己的程式裡呼叫 LTX-2 19B。以下列出要填的呼叫名稱、這個型號接受的每個輸入欄位、每次請求花多少點數，以及一段可以直接貼進終端機執行的請求。

參數說明直接取自型號的輸入 schema，目前只有英文。

總覽

開發商
Lightricks
產出
影片
起價
2.16 點 每秒成片 ($0.0216)
一般耗時
約 68 秒
呼叫名稱

1 點 = 0.01 美元。任務受理時會先保留可能的最高費用，完成後依實際用量結算、無條件進位到整點，多保留的會退回；失敗的任務不扣點數。想在執行前知道確切數字，請先呼叫 POST /api/v1/jobs/quote。

生成影片

lightricks/ltx-2-19b/text-to-video

價格

選項點數 (每秒成片)美元
480p2.16$0.0216
720p2.88$0.0288
1080p4.32$0.0432

參數

欄位型別預設值可用值用途
prompt必填string——Describe the scene, the action, the camera and the sound. Put the soundtrack on its own Audio: line.
aspect_ratio選填string16:916:9, 9:16Output aspect ratio.
resolution選填string720p480p, 720p, 1080pOutput resolution.
duration_seconds選填integer55 到 20Requested output length in whole seconds, from 5 to 20.
seed選填integer—0 到 2147483647Random seed for controlled comparisons, not a frame-identical guarantee.

請求範例

這段請求原樣就能執行，沒寫的欄位都用預設值。執行前請先把金鑰放進環境變數 POPNOW_API_KEY。

POST /api/v1/jobs/createTask
curl -X POST "https://api.popnow.ai/api/v1/jobs/createTask" \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "model": "lightricks/ltx-2-19b/text-to-video",
  "input": {
    "prompt": "A paper boat drifts down a rain-soaked street at dusk, neon signs reflecting in the water, slow tracking shot at ground level",
    "duration_seconds": 5,
    "resolution": "720p"
  }
}'

回應會立刻帶回 taskId。之後用 GET /api/v1/jobs/recordInfo 取得結果，或在請求裡加上 callBackUrl 等候通知。

GET /api/v1/jobs/recordInfo
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=TASK_ID_FROM_CREATE_TASK" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

圖生影片

lightricks/ltx-2-19b/image-to-video

價格

選項點數 (每秒成片)美元
480p2.16$0.0216
720p2.88$0.0288
1080p4.32$0.0432

參數

欄位型別預設值可用值用途
prompt必填string——Describe what happens after the opening frame: the action, the camera and the sound.
image_url必填string (uri)——Opening frame. The clip starts from this image and keeps its aspect ratio.
resolution選填string720p480p, 720p, 1080pOutput resolution.
duration_seconds選填integer55 到 20Requested output length in whole seconds, from 5 to 20.
seed選填integer—0 到 2147483647Random seed for controlled comparisons, not a frame-identical guarantee.

請求範例

這段請求原樣就能執行，沒寫的欄位都用預設值。執行前請先把金鑰放進環境變數 POPNOW_API_KEY。

範例中的 image_url 使用 PopNow 的範例素材，請換成你自己的公開 HTTPS 連結、上傳檔案或已儲存的素材。

POST /api/v1/jobs/createTask
curl -X POST "https://api.popnow.ai/api/v1/jobs/createTask" \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "model": "lightricks/ltx-2-19b/image-to-video",
  "input": {
    "prompt": "He lands softly on the rooftop, laughs and turns toward the camera while the balloons sway in the evening breeze; slow push-in",
    "image_url": "https://media.popnow.ai/influencer/examples/marco.webp",
    "duration_seconds": 5,
    "resolution": "720p"
  }
}'

回應會立刻帶回 taskId。之後用 GET /api/v1/jobs/recordInfo 取得結果，或在請求裡加上 callBackUrl 等候通知。

GET /api/v1/jobs/recordInfo
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=TASK_ID_FROM_CREATE_TASK" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

影片延伸

lightricks/ltx-2-19b/video-extend

價格

選項點數 (每秒成片)美元
480p2.16$0.0216
720p2.88$0.0288
1080p4.32$0.0432

參數

欄位型別預設值可用值用途
prompt必填string——Describe what happens next: the action that follows, the camera move and the sound on an Audio: line.
video_url必填string (uri)——The clip to continue: MP4, MOV or WebM, up to 60 seconds. Its last frame opens the new segment, and the result is your clip with the new segment joined on.
resolution選填string720p480p, 720p, 1080pResolution of the new segment. It sets how sharp the new part is generated; match your source clip.
duration_seconds選填integer55 到 20Length of the new segment in whole seconds, from 5 to 20. The source clip is added on top and is not billed.
seed選填integer—0 到 2147483647Random seed for controlled comparisons, not a frame-identical guarantee.

請求範例

這段請求原樣就能執行，沒寫的欄位都用預設值。執行前請先把金鑰放進環境變數 POPNOW_API_KEY。

範例中的 video_url 使用 PopNow 的範例素材，請換成你自己的公開 HTTPS 連結、上傳檔案或已儲存的素材。

POST /api/v1/jobs/createTask
curl -X POST "https://api.popnow.ai/api/v1/jobs/createTask" \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "model": "lightricks/ltx-2-19b/video-extend",
  "input": {
    "prompt": "The flowers keep opening while the camera slowly pulls back to reveal a sunlit meadow",
    "video_url": "https://media.popnow.ai/effects/flower-bloom-1abd6efb.mp4",
    "duration_seconds": 5,
    "resolution": "720p"
  }
}'

回應會立刻帶回 taskId。之後用 GET /api/v1/jobs/recordInfo 取得結果，或在請求裡加上 callBackUrl 等候通知。

GET /api/v1/jobs/recordInfo
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=TASK_ID_FROM_CREATE_TASK" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

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