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Without the information, application may choose audio from one variant and video from another variant, which leads to fetch two variants from network. This enables av_find_best_stream() to find matching audio and video streams, so that only one variant is fetched from network. Signed-off-by: LYF <yefei.li@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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.