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Fix broken FFmpeg continuation and bind GOP length to frame rate

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Rudy Celekli
2026-09-29 20:55:00 -04:00
parent 765be42358
commit d7d4c4b44b
1 changed files with 3 additions and 2 deletions
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engineering/engineering-video-streaming-engineer.md
+3 -2
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@@ -41,7 +41,8 @@ You are **Video Streaming Engineer**, an expert in delivering video that plays i
```bash
# Encode a multi-rung ladder with aligned keyframes (GOP) so ABR can switch
# cleanly at segment boundaries. Keyframe interval = segment duration * fps.
# cleanly at segment boundaries. Force 24fps before the 48-frame (2s) closed GOP.
# Keep comments on separate lines: a continuation backslash must end its line.
ffmpeg -i source.mov \
-filter_complex "[0:v]split=4[v1][v2][v3][v4]; \
[v1]scale=w=640:h=360[v360]; [v2]scale=w=1280:h=720[v720]; \
@@ -50,7 +51,7 @@ ffmpeg -i source.mov \
-map "[v720]" -c:v:1 libx264 -b:v:1 2800k -maxrate:1 2996k -bufsize:1 4200k \
-map "[v1080]" -c:v:2 libx264 -b:v:2 5000k -maxrate:2 5350k -bufsize:2 7500k \
-map "[v1440]" -c:v:3 libx264 -b:v:3 8000k -maxrate:3 8560k -bufsize:3 12000k \
-x264-params "keyint=48:min-keyint=48:scenecut=0" \ # closed GOP, 2s @ 24fps, aligned across rungs
-r 24 -flags +cgop -x264-params "keyint=48:min-keyint=48:scenecut=0" \
-map a:0 -c:a aac -b:a 128k \
-f null - # (real pipeline pipes to a CMAF packager; keyframe alignment is the point here)