feat: add ltx2.3 support (#1463)

* add GemmaTokenizer

* add basic ltx2.3 support

* change vocab file encoding

* fix ci

* fix ubuntu build

* add temporal tiling support

* add ltx audio support

* update ggml submodule url

* fix generate_video

* add i2v support

* minify bundled Gemma tokenizer vocab sources

* pass video fps into temporal rope embeddings

* fix av_ca_timestep_scale_multiplier

* add LTX2Scheduler support

* update docs

* fix ci

examples/server/README.md

@@ -205,8 +205,9 @@ Default Generation Options:
   --hires-upscaler <string>                highres fix upscaler, Lanczos, Nearest, Latent, Latent (nearest), Latent
                                            (nearest-exact), Latent (antialiased), Latent (bicubic), Latent (bicubic
                                            antialiased), or a model name under --hires-upscalers-dir (default: Latent)
-  --extra-sample-args <string>             extra sampler args, key=value list. Currently lcm supports noise_clip_std,
-                                           noise_scale_start, noise_scale_end
+  --extra-sample-args <string>             extra sampler/scheduler args, key=value list. lcm supports noise_clip_std,
+                                           noise_scale_start, noise_scale_end; ltx2 supports max_shift, base_shift,
+                                           stretch, terminal
   -H, --height <int>                       image height, in pixel space (default: 512)
   -W, --width <int>                        image width, in pixel space (default: 512)
   --steps <int>                            number of sample steps (default: 20)
@@ -271,8 +272,8 @@ Default Generation Options:
                                            dpm++2m, dpm++2mv2, ipndm, ipndm_v, lcm, ddim_trailing, tcd, res_multistep,
                                            res_2s, er_sde, euler_cfg_pp, euler_a_cfg_pp] default: euler for Flux/SD3/Wan, euler_a otherwise
   --scheduler                              denoiser sigma scheduler, one of [discrete, karras, exponential, ays, gits,
-                                           smoothstep, sgm_uniform, simple, kl_optimal, lcm, bong_tangent], default:
-                                           discrete
+                                           smoothstep, sgm_uniform, simple, kl_optimal, lcm, bong_tangent, ltx2], default:
+                                           model-specific
   --sigmas                                 custom sigma values for the sampler, comma-separated (e.g.,
                                            "14.61,7.8,3.5,0.0").
   --skip-layers                            layers to skip for SLG steps (default: [7,8,9])