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Fix MP4 mux for web playback: add faststart and genpts
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- Add -movflags +faststart to move moov atom to start
- Add -fflags +genpts for proper timestamp generation
- Fixes jerky playback and video/audio desync

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
giles
2026-02-04 00:32:45 +00:00
parent 9151d2c2a8
commit 0bd8ee71c7
3 changed files with 39 additions and 26 deletions
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54
app/routers/runs.py
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@@ -402,25 +402,31 @@ async def get_run(
# Detect media type using magic bytes, fall back to database item_type
output_cid = run["output_cid"]
media_type = None
try:
from ..services.run_service import detect_media_type
cache_path = get_cache_manager().get_by_cid(output_cid)
if cache_path and cache_path.exists():
simple_type = detect_media_type(cache_path)
media_type = type_to_mime(simple_type)
output_media_type = media_type
except Exception:
pass
# Fall back to database item_type if local detection failed
if not media_type:
# Streaming runs (with ipfs_cid) are always video/mp4
if run.get("ipfs_cid"):
media_type = "video/mp4"
output_media_type = media_type
else:
try:
import database
item_types = await database.get_item_types(output_cid, run.get("actor_id"))
if item_types:
media_type = type_to_mime(item_types[0].get("type"))
from ..services.run_service import detect_media_type
cache_path = get_cache_manager().get_by_cid(output_cid)
if cache_path and cache_path.exists():
simple_type = detect_media_type(cache_path)
media_type = type_to_mime(simple_type)
output_media_type = media_type
except Exception:
pass
# Fall back to database item_type if local detection failed
if not media_type:
try:
import database
item_types = await database.get_item_types(output_cid, run.get("actor_id"))
if item_types:
media_type = type_to_mime(item_types[0].get("type"))
output_media_type = media_type
except Exception:
pass
artifacts.append({
"cid": output_cid,
"step_name": "Output",
@@ -568,13 +574,17 @@ async def list_runs(
for run in runs:
# Add output media info
if run.get("output_cid"):
try:
cache_path = cache_manager.get_by_cid(run["output_cid"])
if cache_path and cache_path.exists():
simple_type = detect_media_type(cache_path)
run["output_media_type"] = type_to_mime(simple_type)
except Exception:
pass
# Streaming runs (with ipfs_cid) are always video/mp4
if run.get("ipfs_cid"):
run["output_media_type"] = "video/mp4"
else:
try:
cache_path = cache_manager.get_by_cid(run["output_cid"])
if cache_path and cache_path.exists():
simple_type = detect_media_type(cache_path)
run["output_media_type"] = type_to_mime(simple_type)
except Exception:
pass
# Add input media info (first 3 inputs)
input_previews = []