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The following commit(s) were added to refs/heads/master by this push:
new 0b4798f7ab fftools/ffmpeg: disable stdin interaction when fd 0 is
closed
0b4798f7ab is described below
commit 0b4798f7ab964e288241536175228179acb1410f
Author: Zhao Zhili <[email protected]>
AuthorDate: Mon Jun 22 20:36:10 2026 +0800
Commit: Zhao Zhili <[email protected]>
CommitDate: Sun Jun 28 18:26:49 2026 +0000
fftools/ffmpeg: disable stdin interaction when fd 0 is closed
When the parent process closes stdin before launching ffmpeg, fd 0 is
left invalid. The first opened input file then reuses fd 0, and the
read_key() poll in the transcode loop reads from that input instead of
the terminal, stealing bytes and corrupting the stream.
Fixes #23539
---
fftools/ffmpeg.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index b394243f59..d38acffbdf 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -216,6 +216,16 @@ void term_init(void)
#endif
#if HAVE_TERMIOS_H
+ /* A closed fd 0 is later reused by the first opened input file. read_key()
+ * would then read from that input instead of the terminal and corrupt the
+ * stream, so disable interaction when fd 0 is not an open descriptor.
+ */
+ if (stdin_interaction && fcntl(0, F_GETFD) == -1) {
+ av_log(NULL, AV_LOG_WARNING,
+ "fd 0 is not an open file descriptor, stdin interaction
disabled\n");
+ stdin_interaction = 0;
+ }
+
if (stdin_interaction) {
struct termios tty;
if (tcgetattr (0, &tty) == 0) {
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