Takes a video (up to 24 MB) and one to five SRT or WebVTT subtitle texts with la
Takes a video (up to 24 MB) and one to five SRT or WebVTT subtitle texts with language codes, and returns the video with each as a separate, switchable subtitle track tagged with its language, the first marked default. Picture and sound are copied, not re-encoded, so quality is unchanged and it is fast. MP4 uses mov_text (plays in QuickTime, browsers with players, most phones); MKV uses SRT tracks (VLC, mpv, Plex). Unlike /v1/burn-subtitles nothing is drawn into the picture.
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://medien.halowerk.com/v1/video-subtitle-mux
| Category | Image and media |
|---|---|
| Provider host | medien.halowerk.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-31 | valid payment request | 402 | $0.004 | 1046 ms |
Example input (from the provider)
{
"body": {
"container": "mp4",
"source": {
"url": "https://medien.halowerk.com/beispiel/vortrag.mp4"
},
"subtitles": [
{
"language": "en",
"text": "1\n00:00:05,520 --> 00:00:08,960\nYep. I said it before, and I'll say it again.\n\n2\n00:00:10,071 --> 00:00:15,511\nLife moves pretty fast. You don't stop and look around once in a while, you could miss it.\n",
"title": "English"
}
]
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"container": {
"default": "mp4",
"enum": [
"mp4",
"mkv"
],
"type": "string"
},
"source": {
"additionalProperties": false,
"properties": {
"content_base64": {
"maxLength": 11000000,
"type": "string"
},
"filename": {
"maxLength": 260,
"type": "string"
},
"url": {
"maxLength": 2048,
"type": "string"
}
},
"type": "object"
},
"subtitles": {
"items": {
"additionalProperties": false,
"properties": {
"language": {
"enum": [
"de",
"en",
"fr",
"es",
"it",
"nl",
"pt",
"pl",
"tr",
"sv",
"da",
"cs",
"ru",
"uk",
"ja",
"zh",
"ko",
"ar"
],
"type": "string"
},
"text": {
"maxLength": 400000,
"minLength": 10,
"type": "string"
},
"title": {
"maxLength": 60,
"type": "string"
}
},
"required": [
"text",
"language"
],
"type": "object"
},
"maxItems": 5,
"minItems": 1,
"type": "array"
}
},
"required": [
"source",
"subtitles"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}