diff --git a/README.md b/README.md
index effbb08b..4483940d 100644
--- a/README.md
+++ b/README.md
@@ -98,14 +98,18 @@ conda create -y -n lerobot python=3.10
 conda activate lerobot
 ```
 
-Install 🤗 LeRobot:
+When using `miniconda`, if you don't have `ffmpeg` in your environment:
 ```bash
-pip install -e .
+conda install ffmpeg
 ```
 
-> **NOTE:** Depending on your platform, If you encounter any build errors during this step
-you may need to install `cmake` and `build-essential` for building some of our dependencies.
-On linux: `sudo apt-get install cmake build-essential`
+Install 🤗 LeRobot:
+```bash
+pip install --no-binary=av -e .
+```
+
+> **NOTE:** If you encounter build errors, you may need to install additional dependencies (`cmake`, `build-essential`, and `ffmpeg libs`). On Linux, run:
+`sudo apt-get install cmake build-essential python-dev pkg-config libavformat-dev libavcodec-dev libavdevice-dev libavutil-dev libswscale-dev libswresample-dev libavfilter-dev pkg-config`. For other systems, see: [Compiling PyAV](https://pyav.org/docs/develop/overview/installation.html#bring-your-own-ffmpeg)
 
 For simulations, 🤗 LeRobot comes with gymnasium environments that can be installed as extras:
 - [aloha](https://github.com/huggingface/gym-aloha)
@@ -114,7 +118,7 @@ For simulations, 🤗 LeRobot comes with gymnasium environments that can be inst
 
 For instance, to install 🤗 LeRobot with aloha and pusht, use:
 ```bash
-pip install -e ".[aloha, pusht]"
+pip install --no-binary=av -e ".[aloha, pusht]"
 ```
 
 To use [Weights and Biases](https://docs.wandb.ai/quickstart) for experiment tracking, log in with
diff --git a/lerobot/common/datasets/video_utils.py b/lerobot/common/datasets/video_utils.py
index 4f696861..c38d570d 100644
--- a/lerobot/common/datasets/video_utils.py
+++ b/lerobot/common/datasets/video_utils.py
@@ -257,6 +257,7 @@ def encode_video_frames(
 ) -> None:
     """More info on ffmpeg arguments tuning on `benchmark/video/README.md`"""
     video_path = Path(video_path)
+    imgs_dir = Path(imgs_dir)
     video_path.parent.mkdir(parents=True, exist_ok=True)
 
     ffmpeg_args = OrderedDict(
diff --git a/lerobot/common/policies/pi0/modeling_pi0.py b/lerobot/common/policies/pi0/modeling_pi0.py
index bc53bf85..4462f162 100644
--- a/lerobot/common/policies/pi0/modeling_pi0.py
+++ b/lerobot/common/policies/pi0/modeling_pi0.py
@@ -24,7 +24,7 @@ Designed by Physical Intelligence. Ported from Jax by Hugging Face.
 
 Install pi0 extra dependencies:
 ```bash
-pip install -e ".[pi0]"
+pip install --no-binary=av -e ".[pi0]"
 ```
 
 Example of finetuning the pi0 pretrained model (`pi0_base` in `openpi`):
@@ -313,7 +313,7 @@ class PI0Policy(PreTrainedPolicy):
         state = self.prepare_state(batch)
         lang_tokens, lang_masks = self.prepare_language(batch)
         actions = self.prepare_action(batch)
-        actions_is_pad = batch.get("actions_is_pad")
+        actions_is_pad = batch.get("action_is_pad")
 
         loss_dict = {}
         losses = self.model.forward(images, img_masks, lang_tokens, lang_masks, state, actions, noise, time)
diff --git a/lerobot/common/utils/wandb_utils.py b/lerobot/common/utils/wandb_utils.py
index 700ebea5..3fe241d4 100644
--- a/lerobot/common/utils/wandb_utils.py
+++ b/lerobot/common/utils/wandb_utils.py
@@ -90,6 +90,7 @@ class WandBLogger:
             # TODO(rcadene): split train and eval, and run async eval with job_type="eval"
             job_type="train_eval",
             resume="must" if cfg.resume else None,
+            mode=self.cfg.mode if self.cfg.mode in ["online", "offline", "disabled"] else "online",
         )
         print(colored("Logs will be synced with wandb.", "blue", attrs=["bold"]))
         logging.info(f"Track this run --> {colored(wandb.run.get_url(), 'yellow', attrs=['bold'])}")
diff --git a/lerobot/configs/default.py b/lerobot/configs/default.py
index b23bbb6d..ce72466a 100644
--- a/lerobot/configs/default.py
+++ b/lerobot/configs/default.py
@@ -48,6 +48,7 @@ class WandBConfig:
     entity: str | None = None
     notes: str | None = None
     run_id: str | None = None
+    mode: str | None = None  # Allowed values: 'online', 'offline' 'disabled'. Defaults to 'online'
 
 
 @dataclass
diff --git a/pyproject.toml b/pyproject.toml
index 62111b56..1fa7b246 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,7 +62,7 @@ dependencies = [
     "omegaconf>=2.3.0",
     "opencv-python>=4.9.0",
     "packaging>=24.2",
-    "av>=12.0.5",
+    "av>=12.0.5,<13.0.0",
     "pymunk>=6.6.0",
     "pynput>=1.7.7",
     "pyzmq>=26.2.1",