18b4404dc3
The documentation states that av_image_check_size() will return a negative value in case of error, while the check is done on ret != 0. Also return a proper error code rather than -1 in case the check fails.
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.