sub: add option to force using video resolution for image subtitles

Basically for debugging and dealing with broken files.

4 files changed, 10 insertions, 1 deletions

diff --git a/DOCS/man/options.rst b/DOCS/man/options.rst
index 2625c118a0..c1942cf0c6 100644
--- a/DOCS/man/options.rst
+++ b/DOCS/man/options.rst
@@ -1730,6 +1730,13 @@ Subtitles
 
     Disabled by default.
 
+``--image-subs-video-resolution=<yes|no>``
+    Override the image subtitle resolution with the video resolution
+    (default: no). Normally, the subtitle canvas is fit into the video canvas
+    (e.g. letterboxed). Setting this option uses the video size as subtitle
+    canvas size. Can be useful to test broken subtitles, which often happen
+    when the video was trancoded, while attempting to keep the old subtitles.
+
 ``--sub-ass``, ``--no-sub-ass``
     Render ASS subtitles natively (enabled by default).
 
diff --git a/options/options.c b/options/options.c
index 71f5d79fa6..ed10299480 100644
--- a/options/options.c
+++ b/options/options.c
@@ -473,6 +473,7 @@ const m_option_t mp_opts[] = {
     OPT_FLAG("sub-forced-only", forced_subs_only, UPDATE_OSD),
     OPT_FLAG("stretch-dvd-subs", stretch_dvd_subs, UPDATE_OSD),
     OPT_FLAG("stretch-image-subs-to-screen", stretch_image_subs, UPDATE_OSD),
+    OPT_FLAG("image-subs-video-resolution", image_subs_video_res, UPDATE_OSD),
     OPT_FLAG("sub-fix-timing", sub_fix_timing, 0),
     OPT_CHOICE("sub-auto", sub_auto, 0,
                ({"no", -1}, {"exact", 0}, {"fuzzy", 1}, {"all", 2})),
diff --git a/options/options.h b/options/options.h
index f5d1a8a0a0..6199eae5fe 100644
--- a/options/options.h
+++ b/options/options.h
@@ -212,6 +212,7 @@ typedef struct MPOpts {
     int forced_subs_only;
     int stretch_dvd_subs;
     int stretch_image_subs;
+    int image_subs_video_res;
 
     int sub_fix_timing;
 
diff --git a/sub/sd_lavc.c b/sub/sd_lavc.c
index 6b7cd07dcb..b660912bf5 100644
--- a/sub/sd_lavc.c
+++ b/sub/sd_lavc.c
@@ -439,7 +439,7 @@ static void get_bitmaps(struct sd *sd, struct mp_osd_res d, int format,
         d.ml = d.mr = d.mt = d.mb = 0;
     int w = priv->avctx->width;
     int h = priv->avctx->height;
-    if (w <= 0 || h <= 0) {
+    if (w <= 0 || h <= 0 || opts->image_subs_video_res) {
         w = priv->video_params.w;
         h = priv->video_params.h;
     }