remove torchcodec (needs FFmpeg 5.x), keep soundfile backend

Dockerfile

@@ -32,7 +32,7 @@ FROM ubuntu:22.04
 ENV DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    libopenblas0 libgomp1 ca-certificates git libsndfile1 ffmpeg \
+    libopenblas0 libgomp1 ca-certificates git libsndfile1 \
     python3 python3-pip curl \
     && rm -rf /var/lib/apt/lists/*
 
@@ -73,7 +73,7 @@ RUN curl -fL --retry 3 --retry-delay 5 -o /app/models/vae-BF16.gguf \
 RUN pip3 install --no-cache-dir --extra-index-url https://download.pytorch.org/whl/cpu \
     "gradio[mcp]==5.29.0" requests torch safetensors \
     transformers>=4.51.0 peft>=0.18.0 accelerate>=1.12.0 \
-    loguru torchaudio diffusers lightning numpy tensorboard soundfile torchcodec
+    loguru torchaudio diffusers lightning numpy tensorboard soundfile
 
 # Clone ACE-Step repo for training module
 RUN git clone --depth 1 https://github.com/ace-step/ACE-Step-1.5 /app/ace-step-source