This fixes playback in some circumstances (like webm in firefox). Regression after 2c34367b. It is also matching the Matroska specifications: http://matroska.org/technical/specs/notes.html, "The quick eye will notice that if a Cluster's Timecode is set to zero, it is possible to have Blocks with a negative Raw Timecode. Blocks with a negative Raw Timecode are not valid."
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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.
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