docs: private long getSafePts(long pts, int trackIndex) {
          if (mLastPts[trackIndex] >= pts) {
              // Enforce a non-zero minimum spacing
              // between pts
              mLastPts[trackIndex] += 9643;
              return mLastPts[trackIndex];
          }
          mLastPts[trackIndex] = pts;
          return pts;
      }