embedded-video-pip-smooth-playback

Re-encode the embedded clip with FFmpeg using all-intra encoding: ffmpeg -i input.mp4 -c:v libx264 -g 1 -pix_fmt yuv420p output_keyframes.mp4. The -g 1 flag makes every frame a keyframe, so frame-accurate seeks decode instantly during per-frame export.

Sparse keyframes force the decoder to decode from frame 0 forward to reach any requested frame. When decoding takes too long, the renderer times out and captures repeated old frames, producing stutter or freezes in the exported output.

Use H.264 with GOP size 1 (-c:v libx264 -g 1) so every frame is an I-frame, plus -pix_fmt yuv420p for broad player and pipeline compatibility. This makes any seek return a full picture immediately without decoding dependent frames.

Yes, all-intra files are often several times larger than the original because every frame is stored as a full picture. This is usually acceptable for intermediate assets used only during rendering, not for final distribution.

Use it for any asset that must be seeked frame-accurately from code, including picture-in-picture, reverse playback, and scrubber-driven playback. If embedded video looks choppy, check keyframe spacing first and re-encode if needed.