Zac Gaetano
30b4deffc6
The previous patch_decklink.py mixed v14_2_1 versioned types (Fix 1 renamed the allocator class) with no-ops for SetVideoInputFrameMemoryAllocator + QueryInterface-around-GetBytes (Fixes 2 & 3). That inconsistency compiled but silently dropped every video frame: VideoInputFrameArrived saw _v14_2_1 allocator output but tried to read it via the SDK 16 unversioned IDeckLinkVideoBuffer path, and the SDK released the buffer before FFmpeg could consume it.
Bisected with the BMD-provided Capture sample at SDK 16 mode 5 (Hp29) which got frames cleanly, confirming the signal was fine and the bug was in FFmpegs decklink demuxer.
Fix: pull libavdevice/decklink_{enc,dec,common}{.cpp,.h} from upstream FFmpeg master (commits past 7.1 that fully rename every decklink interface to its _v14_2_1 versioned form) and apply that diff in reverse during build. Now build is internally consistent and frames flow.
Verified: SDI1 recorder on zampp2 hits 423 frames in 14s @ 29 fps, ProRes HQ at 91 Mbps.
21 lines
1 KiB
Python
21 lines
1 KiB
Python
#!/usr/bin/env python3
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# Apply the upstream FFmpeg master decklink SDK-16 compatibility patch on top
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# of the release/7.1 source. The patch renames every IDeckLink* interface and
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# helper to its _v14_2_1 versioned form so the call sites keep working against
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# SDK 16's headers (which only retain the versioned aliases). Cherry-picking
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# individual replacements like the previous regex patch produced inconsistent
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# code that compiled but silently dropped every video frame.
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import subprocess, sys, pathlib
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patch = pathlib.Path('/decklink-sdk16.patch')
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if not patch.exists():
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print('FATAL: /decklink-sdk16.patch not found in build context', file=sys.stderr)
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sys.exit(1)
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# Patch was produced as `git diff HEAD FETCH_HEAD` where HEAD=release/7.1 and
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# FETCH_HEAD=master, so we apply it in REVERSE to move 7.1 → master.
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result = subprocess.run(
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['git', 'apply', '-R', '--verbose', str(patch)],
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cwd='/ffmpeg', capture_output=True, text=True,
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)
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print(result.stdout)
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print(result.stderr, file=sys.stderr)
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sys.exit(result.returncode)
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