On 7/8/2024 2:52 PM, Andreas Rheinhardt wrote:
Signed-off-by: Andreas Rheinhardt <[email protected]>
---
  libavformat/matroskaenc.c | 12 ++++++++----
  1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 4b91283119..a98d33abf3 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -1799,10 +1799,14 @@ static int mkv_write_track_video(AVFormatContext *s, 
MatroskaMuxContext *mkv,
              return AVERROR(EINVAL);
          }
- ebml_writer_add_uint(&writer, MATROSKA_ID_VIDEOPIXELCROPB, bottom);
-        ebml_writer_add_uint(&writer, MATROSKA_ID_VIDEOPIXELCROPT, top);
-        ebml_writer_add_uint(&writer, MATROSKA_ID_VIDEOPIXELCROPL, left);
-        ebml_writer_add_uint(&writer, MATROSKA_ID_VIDEOPIXELCROPR, right);
+        if (bottom)
+            ebml_writer_add_uint(&writer, MATROSKA_ID_VIDEOPIXELCROPB, bottom);
+        if (top)
+            ebml_writer_add_uint(&writer, MATROSKA_ID_VIDEOPIXELCROPT, top);
+        if (left)
+            ebml_writer_add_uint(&writer, MATROSKA_ID_VIDEOPIXELCROPL, left);
+        if (right)
+            ebml_writer_add_uint(&writer, MATROSKA_ID_VIDEOPIXELCROPR, right);
cropped_width -= left + right;
          cropped_height -= top + bottom;

LGTM.
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