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-rw-r--r--src/lib/content.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/lib/content.cc b/src/lib/content.cc
index 49ab944be..b6f7ebbaa 100644
--- a/src/lib/content.cc
+++ b/src/lib/content.cc
@@ -255,6 +255,8 @@ Content::set_position (shared_ptr<const Film> film, DCPTime p, bool force_emit)
void
Content::set_trim_start (ContentTime t)
{
+ DCPOMATIC_ASSERT (t.get() >= 0);
+
/* video and audio content can modify its start trim */
if (video) {
@@ -278,6 +280,8 @@ Content::set_trim_start (ContentTime t)
void
Content::set_trim_end (ContentTime t)
{
+ DCPOMATIC_ASSERT (t.get() >= 0);
+
ContentChangeSignaller cc (this, ContentProperty::TRIM_END);
{