if (track->codec == M4AF_FOURCC('m','p','4','a')) {
m4af_write32(ctx, track->timescale << 16);
m4af_write_esds_box(ctx, track_idx);
if (track->codec == M4AF_FOURCC('m','p','4','a')) {
m4af_write32(ctx, track->timescale << 16);
m4af_write_esds_box(ctx, track_idx);