} else {
m4af_write32(ctx, track->creation_time);
m4af_write32(ctx, track->modification_time);
m4af_write32(ctx, track_idx + 1);
m4af_write(ctx, "\0\0\0\0" /* reserved */
, 4);
} else {
m4af_write32(ctx, track->creation_time);
m4af_write32(ctx, track->modification_time);
m4af_write32(ctx, track_idx + 1);
m4af_write(ctx, "\0\0\0\0" /* reserved */
, 4);