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The value returned by strerror_r may be positive depending on the system, so it is necessary to use AVERROR() in order to get a negative number. This way the successive negative check will not fail, and the function will print a meaningful error message on the buffer.
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.