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Improve HEVC detection with fallback probe and yt-dlp postprocessor

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Khoa.vo 2025-12-19 21:13:46 +07:00
parent 101908411f
commit 467056fa9c
1 changed files with 37 additions and 9 deletions
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36
backend/api/routes/feed.py
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@ -233,7 +233,7 @@ async def proxy_video(
cookie_file_path = cookie_file.name
# Prefer H.264 (avc1) over HEVC (hvc1/hev1) for browser compatibility
# Format selection: prefer mp4 with h264, fallback to best mp4, then re-encode if HEVC
# Format selection: prefer mp4 with h264, fallback to best mp4
ydl_opts = {
'format': 'best[ext=mp4][vcodec^=avc]/best[ext=mp4]/best', # Prefer H.264
'outtmpl': output_template,
@ -259,7 +259,7 @@ async def proxy_video(
info = ydl.extract_info(url, download=True)
ext = info.get('ext', 'mp4')
# Get codec info
vcodec = info.get('vcodec', 'unknown')
vcodec = info.get('vcodec', '') or ''
return os.path.join(temp_dir, f"video.{ext}"), vcodec
video_path, video_codec = await loop.run_in_executor(None, download_video)
@ -270,7 +270,21 @@ async def proxy_video(
print(f"Downloaded codec: {video_codec}")
# Check if we need to re-encode HEVC to H.264
is_hevc = video_codec and any(x in video_codec.lower() for x in ['hevc', 'hev1', 'hvc1', 'h265', 'h.265'])
# If codec unknown, probe the actual file
is_hevc = False
if video_codec:
is_hevc = any(x in video_codec.lower() for x in ['hevc', 'hev1', 'hvc1', 'h265', 'h.265'])
else:
# Try probing with yt-dlp's ffprobe
try:
probe_cmd = ['ffprobe', '-v', 'error', '-select_streams', 'v:0',
'-show_entries', 'stream=codec_name', '-of', 'csv=p=0', video_path]
probe_result = subprocess.run(probe_cmd, capture_output=True, timeout=10)
detected_codec = probe_result.stdout.decode().strip().lower()
is_hevc = 'hevc' in detected_codec or 'h265' in detected_codec
print(f"Probed codec: {detected_codec}")
except Exception as probe_err:
print(f"Probe failed: {probe_err}")
if is_hevc:
print(f"HEVC detected, re-encoding to H.264 for browser compatibility...")
@ -288,11 +302,25 @@ async def proxy_video(
'-movflags', '+faststart', # Web optimization
h264_path
]
try:
result = subprocess.run(cmd, capture_output=True, timeout=120)
if result.returncode != 0:
print(f"FFmpeg error: {result.stderr.decode()[:200]}")
return None
return h264_path
except FileNotFoundError:
print("FFmpeg not installed, trying yt-dlp postprocessor...")
# Fallback: re-download with recode postprocessor
recode_opts = ydl_opts.copy()
recode_opts['postprocessors'] = [{'key': 'FFmpegVideoConvertor', 'preferedformat': 'mp4'}]
recode_opts['postprocessor_args'] = ['-c:v', 'libx264', '-preset', 'fast', '-crf', '23']
recode_opts['outtmpl'] = h264_path.replace('.mp4', '.%(ext)s')
try:
with yt_dlp.YoutubeDL(recode_opts) as ydl:
ydl.download([url])
return h264_path if os.path.exists(h264_path) else None
except:
return None
reencoded_path = await loop.run_in_executor(None, reencode_to_h264)
@ -300,7 +328,7 @@ async def proxy_video(
video_path = reencoded_path
print("Re-encoding successful!")
else:
print("Re-encoding failed, using original HEVC (may not play in all browsers)")
print("Re-encoding failed, using original video")
# Save to cache for future requests
cached_path = save_to_cache(url, video_path)