The legacy LTX-2 trainer did not give the clip fps to the DiT. The DiT then
kept temporal RoPE positions in frames during training, but inference uses
seconds (fps 24). The trainer now passes the fps of the stored latents (24 when
the value is missing).
The video transform stage resampled frames to train_fps but kept the source fps
in the batch. The saved clips then had the source fps, and the audio was cut to
the wrong length. The stage now sets the batch fps to train_fps.
The new regression test runs in the CI unit lane.
alanhuangyoo
6ef5b78020