ffmpeg toeof patch

ffmpeg.patch

diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index f6c76bcc55..7c0b95853d 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -157,6 +157,7 @@ typedef struct OptionsContext {
 
     int64_t recording_time;
     int64_t stop_time;
+    int64_t stop_time_eof;
     uint64_t limit_filesize;
     float mux_preload;
     float mux_max_delay;
diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c
index 100fa76e46..3947aab7b5 100644
--- a/fftools/ffmpeg_opt.c
+++ b/fftools/ffmpeg_opt.c
@@ -184,6 +184,7 @@ static void init_options(OptionsContext *o)
     memset(o, 0, sizeof(*o));
 
     o->stop_time = INT64_MAX;
+    o->stop_time_eof = AV_NOPTS_VALUE;
     o->mux_max_delay  = 0.7;
     o->start_time     = AV_NOPTS_VALUE;
     o->start_time_eof = AV_NOPTS_VALUE;
@@ -1094,6 +1095,13 @@ static int open_input_file(OptionsContext *o, const char *filename)
         }
     }
 
+    if (o->stop_time_eof != AV_NOPTS_VALUE) {
+        if (ic->duration>0) {
+            o->recording_time = ic->duration + o->stop_time_eof;
+        } else
+            av_log(NULL, AV_LOG_WARNING, "Cannot use -toeof, duration of %s not known\n", filename);
+    }
+
     if (o->start_time_eof != AV_NOPTS_VALUE) {
         if (ic->duration>0) {
             o->start_time = o->start_time_eof + ic->duration;
@@ -3406,6 +3414,8 @@ const OptionDef options[] = {
         "duration" },
     { "to",             HAS_ARG | OPT_TIME | OPT_OFFSET | OPT_OUTPUT,  { .off = OFFSET(stop_time) },
         "record or transcode stop time", "time_stop" },
+    { "toeof",          HAS_ARG | OPT_TIME | OPT_OFFSET | OPT_INPUT,  { .off = OFFSET(stop_time_eof) },
+        "record or transcode stop time relative to EOF", "time_stop" },
     { "fs",             HAS_ARG | OPT_INT64 | OPT_OFFSET | OPT_OUTPUT, { .off = OFFSET(limit_filesize) },
         "set the limit file size in bytes", "limit_size" },
     { "ss",             HAS_ARG | OPT_TIME | OPT_OFFSET |