[FFmpeg-devel] [PATCH] Add -timelimit option

Mans Rullgard mans
Sun Nov 15 13:25:47 CET 2009


This option limits the CPU time used by ffmpeg to the number of seconds
specified.  After this time, the OS sends a SIGXCPU signal, which we
handle and attempt to exit cleanly.  If the process is stuck, the OS
will deliver a SIGKILL one second later, forcibly terminating the
process.

This functionality is useful in automated setups where a runaway ffmpeg
process would otherwise go undetected.
---
 ffmpeg.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/ffmpeg.c b/ffmpeg.c
index 4d50768..a3eb2fa 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -352,6 +352,10 @@ static void term_init(void)
 
     signal(SIGINT , sigterm_handler); /* Interrupt (ANSI).  */
     signal(SIGTERM, sigterm_handler); /* Termination (ANSI).  */
+#ifdef SIGXCPU
+    signal(SIGXCPU, sigterm_handler);
+#endif
+
     /*
     register a function to be called at normal program termination
     */
@@ -3823,6 +3827,19 @@ static int opt_preset(const char *opt, const char *arg)
     return 0;
 }
 
+static int opt_timelimit(const char *opt, const char *arg)
+{
+#if HAVE_SYS_RESOURCE_H
+    int lim = parse_number_or_die(opt, arg, OPT_INT64, 0, INT_MAX);
+    struct rlimit rl = { lim, lim + 1 };
+    if (setrlimit(RLIMIT_CPU, &rl))
+        perror("setrlimit");
+#else
+    fprintf(stderr, "Warning: -%s not implemented on this OS\n", opt);
+#endif
+    return 0;
+}
+
 static const OptionDef options[] = {
     /* main options */
     { "L", OPT_EXIT, {(void*)show_license}, "show license" },
@@ -3844,6 +3861,7 @@ static const OptionDef options[] = {
     { "dframes", OPT_INT | HAS_ARG, {(void*)&max_frames[CODEC_TYPE_DATA]}, "set the number of data frames to record", "number" },
     { "benchmark", OPT_BOOL | OPT_EXPERT, {(void*)&do_benchmark},
       "add timings for benchmarking" },
+    { "timelimit", OPT_FUNC2 | HAS_ARG, {(void*)opt_timelimit}, "set max runtime in seconds", "limit" },
     { "dump", OPT_BOOL | OPT_EXPERT, {(void*)&do_pkt_dump},
       "dump each input packet" },
     { "hex", OPT_BOOL | OPT_EXPERT, {(void*)&do_hex_dump},
-- 
1.6.5.2




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