Fix browser recording playback and web management consistency

2026-10-03 17:10:06 +08:00
parent d7058e8af7
commit 969dcabe99
9 changed files with 265 additions and 18 deletions
@@ -0,0 +1,70 @@
+"""Bounded, ephemeral H.264 playback; original recordings remain untouched."""
+from contextlib import contextmanager
+import os
+import shutil
+import subprocess
+import threading
+
+SLOTS = threading.BoundedSemaphore(2)
+
+
+class PlaybackError(Exception):
+    pass
+
+
+def command(source, authorization, duration):
+    executable = shutil.which('ffmpeg')
+    if not executable:
+        raise PlaybackError('回放转换需要服务器安装 FFmpeg')
+    device = os.environ.get('VISION_VAAPI_DEVICE', '/dev/dri/renderD128')
+    acceleration = []
+    if os.access(device, os.R_OK | os.W_OK):
+        acceleration = ['-hwaccel', 'vaapi', '-hwaccel_device', device,
+                        '-hwaccel_output_format', 'vaapi', '-extra_hw_frames', '8']
+        video = ['-vf', 'fps=15,scale_vaapi=w=1920:h=1080:format=nv12:force_original_aspect_ratio=decrease:force_divisible_by=2',
+                 '-c:v', 'h264_vaapi', '-profile:v', 'main', '-level:v', '4.1',
+                 '-rc_mode', 'CQP', '-qp', '25', '-g', '30', '-bf', '0']
+    else:
+        video = ['-vf', 'fps=10,scale=768:432:force_original_aspect_ratio=decrease:force_divisible_by=2',
+                 '-c:v', 'libx264', '-threads', '1', '-preset', 'veryfast',
+                 '-tune', 'zerolatency', '-profile:v', 'baseline', '-pix_fmt', 'yuv420p',
+                 '-crf', '26', '-g', '20', '-bf', '0']
+    return [executable, '-hide_banner', '-loglevel', 'error', '-nostdin',
+            '-threads', '1', '-filter_threads', '1'] + acceleration + [
+            '-rw_timeout', '15000000', '-headers', 'Authorization: ' + authorization + '\r\n',
+            '-readrate', '1', '-i', source, '-t', str(duration),
+            '-map', '0:v:0', '-map', '0:a:0?', '-sn', '-dn'] + video + [
+            '-c:a', 'aac', '-ar', '48000', '-ac', '1', '-b:a', '64k',
+            '-movflags', '+frag_keyframe+empty_moov+default_base_moof',
+            '-frag_duration', '1000000', '-f', 'mp4', 'pipe:1']
+
+
+@contextmanager
+def stream(source, authorization, duration):
+    if not SLOTS.acquire(blocking=False):
+        raise PlaybackError('已有两个回放正在进行，请关闭其他回放后重试')
+    process = timer = None
+    try:
+        # No shell and no diagnostics containing authentication headers in logs.
+        process = subprocess.Popen(command(source, authorization, duration),
+                                   stdin=subprocess.DEVNULL, stdout=subprocess.PIPE,
+                                   stderr=subprocess.DEVNULL)
+        timer = threading.Timer(duration + 45, process.kill)
+        timer.daemon = True
+        timer.start()
+        yield process.stdout
+    except OSError as exc:
+        raise PlaybackError('录像转换服务暂不可用') from exc
+    finally:
+        if timer:
+            timer.cancel()
+        if process:
+            if process.poll() is None:
+                process.terminate()
+                try:
+                    process.wait(timeout=3)
+                except subprocess.TimeoutExpired:
+                    process.kill()
+                    process.wait()
+            process.stdout.close()
+        SLOTS.release()