feat(video): add SEF (--last-frame), S2V (--subject-image), model auto-switch

- Add --last-frame flag for SEF (start-end frame) interpolation mode
- Add --subject-image flag for subject reference (S2V-01 character consistency)
- Auto-switch model: --last-frame -> Hailuo-02, --subject-image -> S2V-01
- Explicit --model flag always overrides auto-switch
- Add apiDocs field
- Update description with all available models (T2V/I2V/S2V)
- Add last_frame_image and subject_reference to VideoRequest type
- Add validation: --last-frame requires --first-frame
- Add SEF and S2V examples

Author: Raylan LIN

src/command.ts

@@ -14,6 +14,7 @@ export interface Command {
   usage?: string;
   options?: OptionDef[];
   examples?: string[];
+  apiDocs?: string;
   execute(config: Config, flags: GlobalFlags): Promise<void>;
 }
 
@@ -23,6 +24,7 @@ export interface CommandSpec {
   usage?: string;
   options?: OptionDef[];
   examples?: string[];
+  apiDocs?: string;
   run(config: Config, flags: GlobalFlags): Promise<void>;
 }
 
@@ -33,6 +35,7 @@ export function defineCommand(spec: CommandSpec): Command {
     usage: spec.usage,
     options: spec.options,
     examples: spec.examples,
+    apiDocs: spec.apiDocs,
     execute: spec.run,
   };
 }

src/commands/video/generate.ts

@@ -21,12 +21,15 @@ import { promptText, failIfMissing } from '../../utils/prompt';
 
 export default defineCommand({
   name: 'video generate',
-  description: 'Generate a video (Hailuo-2.3 / 2.3-Fast)',
+  description: 'Generate a video (T2V: Hailuo-2.3 / 2.3-Fast / Hailuo-02 | I2V: + I2V-01 / I2V-01-Director / I2V-01-live | S2V: S2V-01)',
+  apiDocs: 'https://platform.minimax.io/docs/api-reference/video-generation',
   usage: 'mmx video generate --prompt <text> [flags]',
   options: [
-    { flag: '--model <model>', description: 'Model ID (default: MiniMax-Hailuo-2.3)' },
+    { flag: '--model <model>', description: 'Model ID (default: MiniMax-Hailuo-2.3). Auto-switched to Hailuo-02 with --last-frame, or S2V-01 with --subject-image.' },
     { flag: '--prompt <text>', description: 'Video description', required: true },
-    { flag: '--first-frame <path-or-url>', description: 'First frame image' },
+    { flag: '--first-frame <path-or-url>', description: 'First frame image (local path or URL). Auto base64-encoded for local files.' },
+    { flag: '--last-frame <path-or-url>', description: 'Last frame image (local path or URL). Enables SEF (start-end frame) interpolation mode with Hailuo-02 model. Requires --first-frame.' },
+    { flag: '--subject-image <path-or-url>', description: 'Subject reference image for character consistency (local path or URL). Switches to S2V-01 model.' },
     { flag: '--callback-url <url>', description: 'Webhook URL for completion notification' },
     { flag: '--download <path>', description: 'Save video to file on completion' },
     { flag: '--no-wait', description: 'Return task ID immediately without waiting' },
@@ -38,6 +41,10 @@ export default defineCommand({
     'mmx video generate --prompt "Ocean waves at sunset." --download sunset.mp4',
     'mmx video generate --prompt "A robot painting." --async --quiet',
     'mmx video generate --prompt "A robot painting." --no-wait --quiet',
+    '# SEF: first + last frame interpolation (uses Hailuo-02 model)',
+    'mmx video generate --prompt "Walk forward" --first-frame start.jpg --last-frame end.jpg',
+    '# Subject reference: character consistency (uses S2V-01 model)',
+    'mmx video generate --prompt "A detective walking" --subject-image character.jpg',
   ],
   async run(config: Config, flags: GlobalFlags) {
     let prompt = flags.prompt as string | undefined;
@@ -55,14 +62,22 @@ export default defineCommand({
       }
     }
 
-    const model = (flags.model as string) || 'MiniMax-Hailuo-2.3';
+    // Determine model: explicit --model overrides auto-switch
+    const explicitModel = flags.model as string | undefined;
+    let model = explicitModel || 'MiniMax-Hailuo-2.3';
+    if (!explicitModel && flags.lastFrame) {
+      model = 'MiniMax-Hailuo-02';
+    } else if (!explicitModel && flags.subjectImage) {
+      model = 'S2V-01';
+    }
     const format = detectOutputFormat(config.output);
 
     const body: VideoRequest = {
       model,
       prompt,
     };
 
+    // First frame (I2V)
     if (flags.firstFrame) {
       const framePath = flags.firstFrame as string;
       if (framePath.startsWith('http')) {
@@ -75,6 +90,41 @@ export default defineCommand({
       }
     }
 
+    // Last frame (SEF mode)
+    if (flags.lastFrame) {
+      if (!flags.firstFrame) {
+        throw new CLIError(
+          '--last-frame requires --first-frame (SEF mode).',
+          ExitCode.USAGE,
+          'mmx video generate --prompt <text> --first-frame <path> --last-frame <path>',
+        );
+      }
+      const framePath = flags.lastFrame as string;
+      if (framePath.startsWith('http')) {
+        body.last_frame_image = framePath;
+      } else {
+        const imgData = readFileSync(framePath);
+        const ext = extname(framePath).toLowerCase();
+        const mime = MIME_TYPES[ext] || 'image/jpeg';
+        body.last_frame_image = `data:${mime};base64,${imgData.toString('base64')}`;
+      }
+    }
+
+    // Subject reference (S2V mode)
+    if (flags.subjectImage) {
+      const imgPath = flags.subjectImage as string;
+      let imageData: string;
+      if (imgPath.startsWith('http')) {
+        imageData = imgPath;
+      } else {
+        const imgData = readFileSync(imgPath);
+        const ext = extname(imgPath).toLowerCase();
+        const mime = MIME_TYPES[ext] || 'image/jpeg';
+        imageData = `data:${mime};base64,${imgData.toString('base64')}`;
+      }
+      body.subject_reference = [{ type: 'character', image: [imageData] }];
+    }
+
     if (flags.callbackUrl) {
       body.callback_url = flags.callbackUrl as string;
     }
@@ -93,15 +143,12 @@ export default defineCommand({
 
     const taskId = response.task_id;
 
-    if (!config.quiet && !flags.noWait && !config.async) {
-      process.stderr.write(`[Model: ${model}]\n`);
-    } else if (!config.quiet) {
+    if (!config.quiet) {
       process.stderr.write(`[Model: ${model}]\n`);
     }
 
     // --no-wait or --async: return task ID immediately
     if (flags.noWait || config.async) {
-      // Always pure JSON — Agent/CI mode needs predictable stdout
       process.stdout.write(JSON.stringify({ taskId }));
       process.stdout.write('\n');
       return;
@@ -169,7 +216,6 @@ export default defineCommand({
 
     await downloadFile(downloadUrl, destPath, { quiet: config.quiet });
 
-    // Pure local path output (stdout stays clean for piping)
     process.stdout.write(destPath);
     process.stdout.write('\n');
   },

src/types/api.ts

@@ -180,7 +180,12 @@ export interface VideoRequest {
   model: string;
   prompt: string;
   first_frame_image?: string;
+  last_frame_image?: string;
   callback_url?: string;
+  subject_reference?: Array<{
+    type: string;
+    image: string[];
+  }>;
 }
 
 export interface VideoResponse {