feat: video intro and watermark for source attribution#13
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Add a cinematic intro (5s) and persistent top-right watermark to burned videos, attributing the original creator. The intro displays channel name, video title, URLs, and a bilingual copyright notice with staged fade-in animation. Skipped automatically for local file uploads. - Extend VideoMetadata/Job with channel, channel_url, video_fps fields - Add generate_intro() using FFmpeg lavfi color + multi-layer drawtext - Add concat_videos() using FFmpeg concat demuxer (stream copy) - Add watermark drawtext to burn_subtitles via watermark_text param - Graceful degradation: intro/concat failures fall back to subtitle-only - Extract _run_ffmpeg_with_progress() to eliminate subprocess duplication - 190 unit tests, 0 regressions Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Source: {channel}) throughout the main videoChanges
VideoMetadata/Job: newchannel,channel_url,video_fpsfieldsffmpeg.py:generate_intro(),concat_videos(),watermark_textparam onburn_subtitles, extracted_run_ffmpeg_with_progress()helperpipeline.py: intro + concat orchestration inrun_burn()with two-stage degradationTest plan
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