完善节目管理与回放播放体验

backend/services/transcoder.py

@@ -1,4 +1,3 @@
-import asyncio
 import subprocess
 import os
 from config import settings
@@ -7,12 +6,15 @@ from config import settings
 class TranscodeManager:
     _processes: dict[str, list[subprocess.Popen]] = {}
 
-    def start_transcode(self, stream_key: str, input_url: str):
+    def start_transcode(self, stream_key: str, input_url: str, profile: str = "standard"):
         if stream_key in self._processes:
             return
 
         procs = []
-        for quality in settings.qualities:
+        qualities = settings.transcode_profiles.get(profile, settings.qualities)
+        segment_seconds = max(1, settings.hls_segment_seconds)
+        keyframe_frames = segment_seconds * 30
+        for quality in qualities:
             label = quality["label"]
             width = quality["width"]
             height = quality["height"]
@@ -25,11 +27,16 @@ class TranscodeManager:
                 "-c:v", "libx264", "-preset", "ultrafast",
                 "-b:v", bitrate,
                 "-s", f"{width}x{height}",
+                "-sc_threshold", "0",
+                "-g", str(keyframe_frames),
+                "-keyint_min", str(keyframe_frames),
+                "-force_key_frames", f"expr:gte(t,n_forced*{segment_seconds})",
+                "-copyts", "-start_at_zero",
                 "-c:a", "aac", "-b:a", "128k",
                 "-f", "hls",
-                "-hls_time", "4",
+                "-hls_time", str(segment_seconds),
                 "-hls_list_size", "6",
-                "-hls_flags", "delete_segments",
+                "-hls_flags", "delete_segments+independent_segments+program_date_time",
                 "-hls_segment_filename", f"{hls_dir}/segment_%03d.ts",
                 f"{hls_dir}/index.m3u8",
             ]