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55815edca0
The problem with url_exist() is that it tries to open a resource in RDONLY mode. If the file is a FIFO and there is already a reading client, the open() call will hang. By using avio_check() with access mode of 0, the second reading process will check if the file exists without attempting to open it, thus avoiding the lock. Fix issue #1663. Signed-off-by: Anton Khirnov <anton@khirnov.net>
Libav README ------------ 1) Documentation ---------------- * Read the documentation in the doc/ directory. 2) Licensing ------------ * See the LICENSE file.