[FFmpeg-devel] [PATCH 4/4] avformat/concatdec: always re-calculate start time and duration

[Marton Balint]

This allows the underlying files to change their duration on subsequent
avformat context opens.

An example use case where this matters:

ffconcat version 1.0
file dummy.mxf
file dummy.mxf

ffmpeg -re -stream_loop -1 -i dummy.ffconcat -f sdl2 none

The user can seamlessly change the input by atomically replacing dummy.mxf.

Signed-off-by: Marton Balint <cus at passwd.hu>
---
 libavformat/concatdec.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/libavformat/concatdec.c b/libavformat/concatdec.c
index ebc50324cc..2ebd2120c3 100644
--- a/libavformat/concatdec.c
+++ b/libavformat/concatdec.c
@@ -355,14 +355,12 @@ static int open_file(AVFormatContext *avf, unsigned fileno)
         return ret;
     }
     cat->cur_file = file;
-    if (file->start_time == AV_NOPTS_VALUE)
-        file->start_time = !fileno ? 0 :
-                           cat->files[fileno - 1].start_time +
-                           cat->files[fileno - 1].duration;
+    file->start_time = !fileno ? 0 :
+                       cat->files[fileno - 1].start_time +
+                       cat->files[fileno - 1].duration;
     file->file_start_time = (cat->avf->start_time == AV_NOPTS_VALUE) ? 0 : cat->avf->start_time;
     file->file_inpoint = (file->inpoint == AV_NOPTS_VALUE) ? file->file_start_time : file->inpoint;
-    if (file->duration == AV_NOPTS_VALUE)
-        file->duration = get_best_effort_duration(file, cat->avf);
+    file->duration = get_best_effort_duration(file, cat->avf);
 
     if (cat->segment_time_metadata) {
         av_dict_set_int(&file->metadata, "lavf.concatdec.start_time", file->start_time, 0);
@@ -529,8 +527,7 @@ static int open_next_file(AVFormatContext *avf)
     ConcatContext *cat = avf->priv_data;
     unsigned fileno = cat->cur_file - cat->files;
 
-    if (cat->cur_file->duration == AV_NOPTS_VALUE)
-        cat->cur_file->duration = get_best_effort_duration(cat->cur_file, cat->avf);
+    cat->cur_file->duration = get_best_effort_duration(cat->cur_file, cat->avf);
 
     if (++fileno >= cat->nb_files) {
         cat->eof = 1;
-- 
2.16.4