player: handle rebasing start time differently

Most of this is explained in the DOCS additions.

This gives us slightly more sanity, because there is less interaction
between the various parts. The goal is getting rid of the video_offset
entirely.

The simplification extends to the user API. In particular, we don't need
to fix missing parts in the API, such as the lack for a seek command
that seeks relatively to the start time. All these things are now
transparent.

(If someone really wants to know the real timestamps/start time, new
properties would have to be added.)

2 files changed, 4 insertions, 0 deletions

diff --git a/options/options.c b/options/options.c
index 5cb5e2b522..a42d818c83 100644
--- a/options/options.c
+++ b/options/options.c
@@ -198,6 +198,8 @@ const m_option_t mp_opts[] = {
     OPT_REL_TIME("end", play_end, 0),
     OPT_REL_TIME("length", play_length, 0),
 
+    OPT_FLAG("rebase-start-time", rebase_start_time, 0),
+
     OPT_TIME("ab-loop-a", ab_loop[0], 0, .min = MP_NOPTS_VALUE),
     OPT_TIME("ab-loop-b", ab_loop[1], 0, .min = MP_NOPTS_VALUE),
 
@@ -763,6 +765,7 @@ const struct MPOpts mp_default_opts = {
     .consolecontrols = 1,
     .playlist_pos = -1,
     .play_frames = -1,
+    .rebase_start_time = 1,
     .keep_open = 0,
     .stream_id = { { [STREAM_AUDIO] = -1,
                      [STREAM_VIDEO] = -1,
diff --git a/options/options.h b/options/options.h
index 31006c11bd..49387f388b 100644
--- a/options/options.h
+++ b/options/options.h
@@ -173,6 +173,7 @@ typedef struct MPOpts {
     struct m_rel_time play_start;
     struct m_rel_time play_end;
     struct m_rel_time play_length;
+    int rebase_start_time;
     int play_frames;
     double ab_loop[2];
     double step_sec;