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If the first argument can be read as a video size, set that output size in the scale. This allows to specify in a filtergraph scale=qcif or scale=320x240. This is not completely safe, for example in case of a typo in the video size string the first argument will be read as the input width expression, giving rise to a confusing comment.
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.