video: Avoid writing 0 sample count ctts entry

After the initial ctts entry is written, cttsSampleCount
is set to 0, and the next ctts is written with 0 sample
count.

Add change to write ctts entry only for non-zero sample
count.

Change-Id: I457c3c9bdd402138338c340db4187f1d2b9bdbe6

1 files changed, 5 insertions, 1 deletions

diff --git a/media/libstagefright/MPEG4Writer.cpp b/media/libstagefright/MPEG4Writer.cpp
index cb9df29..3614373 100644
--- a/media/libstagefright/MPEG4Writer.cpp
+++ b/media/libstagefright/MPEG4Writer.cpp
@@ -2401,7 +2401,11 @@ status_t MPEG4Writer::Track::threadEntry() {
                 cttsSampleCount = 0;      // No sample in ctts box is pending
             } else {
                 if (currCttsOffsetTimeTicks != lastCttsOffsetTimeTicks) {
-                    addOneCttsTableEntry(cttsSampleCount, lastCttsOffsetTimeTicks);
+                    // cttsSampleCount is 0 after writing the initial ctts entry
+                    // Avoid writing entry with 0 sample count
+                    if (cttsSampleCount != 0) {
+                        addOneCttsTableEntry(cttsSampleCount, lastCttsOffsetTimeTicks);
+                    }
                     lastCttsOffsetTimeTicks = currCttsOffsetTimeTicks;
                     cttsSampleCount = 1;  // One sample in ctts box is pending
                 } else {