#9752: ffmpeg is affecting the parent shell's file stream -------------------------------------+------------------------------------- Reporter: rgovostes | Type: defect Status: new | Priority: normal Component: | Version: undetermined | unspecified Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- I am invoking ffmpeg from within a bash loop like this: {{{ while IFS="" read -r PLAYLIST; do ... ffmpeg -f concat -i concat.txt -i chapters.txt -map_metadata 1 \ -c copy merged.mp4 .... done < <(head -n 3 playlists.txt) }}} Each iteration of this loop, it should read one line from `playlists.txt` into the variable `PLAYLIST`. However, the lines are being unexpectedly truncated. Each line should start `{"ie_key": "YoutubeTab"` but when the truncation occurs the first 7 bytes are skipped and the loop reads `y": "YoutubeTab"`. This *only* happens when ffmpeg is invoked within the loop. I wasn't aware a child process could affect the parent like this but maybe ffmpeg is inheriting a file descriptor and inadvertently seeking it? {{{ ffmpeg version 5.0.1 Copyright (c) 2000-2022 the FFmpeg developers built with Apple clang version 13.1.6 (clang-1316.0.21.2) }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/9752> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker