ffmpeg_subtitle_apply 新增内嵌字幕选项

* ffmpeg_subtitle_apply 新增内嵌字幕选项

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Merge request URL: https://g-ldyi2063.coding.net/p/dev/d/modalDeploy/git/merge/4860?initial=true
Co-authored-by: shuohigh@gmail.com

tests/ffmpeg_test_case.py

@@ -257,5 +257,14 @@ class FFMPEGTestCase(unittest.IsolatedAsyncioTestCase):
         ffmpeg_cmd.output("./videos/output_large_h264.mp4", options=h264_options)
         await ffmpeg_cmd.execute()
 
+    async def test_ffmpeg_subtitle_apply(self):
+        video = "./videos/subtitle_test/A美洋MEIYANG 方圆牛仔马甲 率性哲学！八支精棉牛仔无袖上衣-周二.mp4"
+        subtitle = "./videos/subtitle_test/A美洋MEIYANG 方圆牛仔马甲 率性哲学！八支精棉牛仔无袖上衣-周二.vtt"
+        output = "./videos/subtitle_test/output.mp4"
+        output_video, metadata = await VideoUtils.ffmpeg_subtitle_apply(media_path=video, subtitle_path=None,
+                                                                        embed_subtitle_path=subtitle, font_dir=None,
+                                                                        output_path=output)
+        self.assertEqual(len(metadata.streams), 3)
+
     if __name__ == '__main__':
         unittest.main()