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The old implementation, upon receiving a frame on the main input, would request an overlay frame if necessary. This could generate an infinite recursion, off-by-one frame mismatch and other harmful effects, especially it the split filter is present upgraph. The new implementation uses the linear approach: it uses two buffer queues for frames received out of turn and forwards request_frame calls to the input where a frame is necessary.
FFmpeg README ------------- 1) Documentation ---------------- * Read the documentation in the doc/ directory in git. You can also view it online at http://ffmpeg.org/documentation.html 2) Licensing ------------ * See the LICENSE file. 3) Build and Install -------------------- * See the INSTALL file.