Update video decoder & reader supported format list

[JanuszL]

• Removes references to unsupported CPU codecs
• Updates operator documentation to reflect changes in supported formats

Category:

Other (e.g. Documentation, Tests, Configuration)

Description:

• Removes references to unsupported CPU codecs
• Updates operator documentation to reflect changes in supported formats
• Follow-up for Limit CPU video decoder codec support #6352

Additional information:

Affected modules and functionalities:

• video reader and decoder

Key points relevant for the review:

• NA

Tests:

• Existing tests apply
• New tests added
  • Python tests
  • GTests
  • Benchmark
  • Other
• N/A

Checklist

Documentation

• Existing documentation applies
• Documentation updated
  • Docstring
  • Doxygen
  • RST
  • Jupyter
  • Other
• N/A

DALI team only

Requirements

• Implements new requirements
• Affects existing requirements
• N/A

REQ IDs: N/A

JIRA TASK: DALI-4712

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Greptile Summary

This PR updates operator docstrings for the video decoder and video reader operators to correctly reflect that H.264/AVC and H.265/HEVC are no longer supported on the CPU backend, as a follow-up to #6352.

• decoders__Video docstring: H.264/AVC and H.265/HEVC moved from "supported by both CPU and Mixed backends" to "Mixed backend only".
• experimental__readers__Video docstring: the same codecs moved from "supported by both CPU and GPU backends" to "GPU backend only".

Confidence Score: 5/5

Documentation-only change with no logic modifications; both operator docstrings are updated consistently.

Both changed files touch only docstrings. The codec lists in the two operators are updated identically and are internally consistent with each other. No runtime behavior is altered.

No files require special attention.

Important Files Changed

Filename	Overview
dali/operators/video/decoder/video_decoder_cpu.cc	Docstring updated: H.264/AVC and H.265/HEVC moved from "CPU and Mixed" section to "Mixed backend only" to reflect removal of CPU codec support (follow-up to #6352).
dali/operators/video/reader/video_reader_decoder_op.cc	Docstring updated: H.264/AVC and H.265/HEVC moved from "CPU and GPU" section to "GPU backend only", consistent with the decoder operator change.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    subgraph Before["Before (Incorrect)"]
        B_CPU["CPU + Mixed/GPU backends"]
        B_CPU --> B_H264["H.264/AVC"]
        B_CPU --> B_H265["H.265/HEVC"]
        B_CPU --> B_VP8["VP8"]
        B_CPU --> B_VP9["VP9"]
        B_CPU --> B_MJPEG["MJPEG"]
        B_GPU["Mixed/GPU only"]
        B_GPU --> B_AV1["AV1"]
        B_GPU --> B_MPEG4["MPEG-4"]
    end

    subgraph After["After (Correct)"]
        A_CPU["CPU + Mixed/GPU backends"]
        A_CPU --> A_VP8["VP8"]
        A_CPU --> A_VP9["VP9"]
        A_CPU --> A_MJPEG["MJPEG"]
        A_GPU["Mixed/GPU only"]
        A_GPU --> A_AV1["AV1"]
        A_GPU --> A_MPEG4["MPEG-4"]
        A_GPU --> A_H264["H.264/AVC"]
        A_GPU --> A_H265["H.265/HEVC"]
    end

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