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The special-case behavior may complicate parsing when the -show_format_entry option is used programmatically in a script. The option default=nk=1 achieves the same purpose, if the objective is to skip printing the single field key.
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.