feat: expand livestream management platform

backend/services/transcoder.py

@@ -6,33 +6,38 @@ from config import settings
 class TranscodeManager:
     _processes: dict[str, list[subprocess.Popen]] = {}
 
-    def start_transcode(self, stream_key: str, input_url: str, profile: str = "standard"):
+    def start_transcode(self, stream_key: str, input_url: str, qualities: list[dict]):
         if stream_key in self._processes:
             return
 
         procs = []
-        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"]
+            fps = quality.get("fps", 30)
+            codec = quality.get("codec", "libx264")
             bitrate = quality["bitrate"]
+            crf = quality.get("crf", 23)
+            preset = quality.get("preset", "ultrafast")
+            audio_bitrate = quality.get("audio_bitrate", "128k")
+            keyframe_seconds = quality.get("keyframe_seconds", segment_seconds)
+            keyframe_frames = keyframe_seconds * fps
             hls_dir = f"/tmp/hls/{stream_key}/{label}"
             os.makedirs(hls_dir, exist_ok=True)
             cmd = [
                 "ffmpeg", "-y",
                 "-i", input_url,
-                "-c:v", "libx264", "-preset", "ultrafast",
-                "-b:v", bitrate,
+                "-c:v", codec, "-preset", preset,
+                "-r", str(fps), "-b:v", bitrate, "-crf", str(crf),
                 "-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})",
+                "-force_key_frames", f"expr:gte(t,n_forced*{keyframe_seconds})",
                 "-copyts", "-start_at_zero",
-                "-c:a", "aac", "-b:a", "128k",
+                "-c:a", "aac", "-b:a", audio_bitrate,
                 "-f", "hls",
                 "-hls_time", str(segment_seconds),
                 "-hls_list_size", "6",