Adds instruction to install Ubuntu multimedia packages for MP4 play

[dengyuchenkit]

Description

Add instruction to install Ubuntu multimedia packages for MP4 play

Type of change

• Documentation update

Checklist

• [x ] I have read and understood the contribution guidelines
• [x ] I have run the pre-commit checks with ./isaaclab.sh --format
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there

[greptile-apps]

Greptile Summary

This PR appends a small documentation note to the humanoids imitation learning guide, instructing users to install Ubuntu multimedia packages (libavcodec-extra, gstreamer1.0-libav, gstreamer1.0-plugins-ugly) in order to play the MP4 video produced by the HDF5-to-MP4 conversion step. The addition is well-placed immediately after the conversion command and addresses a common Ubuntu codec gap.

• The three packages cover FFmpeg extra codecs and the necessary GStreamer plugins for H.264/MP4 playback.
• sudo apt update is correctly included before sudo apt install to ensure the package lists are fresh.
• No code logic, tests, or APIs are affected — this is a purely additive documentation change.

Confidence Score: 5/5

• This PR is safe to merge — it is a purely additive, documentation-only change with no risk to code correctness or functionality.
• The change is a single documentation addition of 7 lines in an .rst file. The packages listed are standard Ubuntu multimedia packages appropriate for MP4 playback, and the instruction is placed in a logical location immediately following the video conversion step.
• No files require special attention.

Important Files Changed

Filename	Overview
docs/source/overview/imitation-learning/humanoids_imitation.rst	Appends a short documentation note with apt commands to install Ubuntu multimedia packages (libavcodec-extra, gstreamer1.0-libav, gstreamer1.0-plugins-ugly) for MP4 playback after the HDF5-to-MP4 conversion step.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Run SDG locomanipulation script] --> B[HDF5 dataset generated]
    B --> C["Run hdf5_to_mp4.py conversion tool"]
    C --> D[MP4 video generated]
    D --> E{Ubuntu multimedia\npackages installed?}
    E -- No --> F["sudo apt update\nsudo apt install libavcodec-extra\ngstreamer1.0-libav gstreamer1.0-plugins-ugly"]
    F --> G[Play MP4 video]
    E -- Yes --> G

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_{Last reviewed commit: 7c9e3ce}