NervProj: Setting up support for OpenAI whisper

We start with the github repository: git@github.com:roche-emmanuel/whisper.git

We need to prepare a python environment for whisper:

  whisper_env:
    inherit: default_env
    packages:
      - numba
      - numpy
      - torch
      - tqdm
      - more-itertools
      - tiktoken==0.3.3

Then we prepare the environment:
```
nvp pyenv setup whisper_env
```
- ⇒ So far so good 👍!
Hmm, actually we probably don't even need this and we can simply use the package openai-whisper instead.

Just written the whisper_gen component to handle the convertion:

class WhisperGen(NVPComponent):
    """WhisperGen component class"""

    def __init__(self, ctx: NVPContext):
        """Component constructor"""
        NVPComponent.__init__(self, ctx)

        self.config = ctx.get_config()["movie_handler"]

    def process_cmd_path(self, cmd):
        """Re-implementation of process_cmd_path"""

        if cmd == "convert":
            file = self.get_param("input_file")
            model = self.get_param("model")
            return self.translate_audio(file, model)

        return False

    def translate_audio(self, file, model):
        """Translate an audio file to text"""
        logger.info("Should translate audio file to text: %s", file)

        tools: ToolsManager = self.get_component("tools")
        ffmpeg_path = tools.get_tool_path("ffmpeg")
        ffmpeg_dir = self.get_parent_folder(ffmpeg_path)
        # sys.path.append(ffmpeg_dir)
        logger.info("Adding path to ffmpeg: %s", ffmpeg_dir)
        self.append_env_list([ffmpeg_dir], os.environ)

        # Check that cuda is available:
        self.check(torch.cuda.is_available(), "Torch CUDA backend is not available ?")

        model = whisper.load_model(model)

        result = model.transcribe(file)
        txt = result["text"]
        self.write_text_file(txt, file + ".txt")
        logger.info("Done")
        logger.info("Generated output: %s", txt)
        return True

⇒ And this works just fine!

Note: models are saved in C:\Users\ultim\.cache\whisper ⇒ will make a copy of those just in case .

Updating python env to get CUDA support:

  whisper_env:
    inherit: default_env
    packages:
      - openai-whisper
      - --extra-index-url https://download.pytorch.org/whl/cu117
      - torch
      - torchvision
      - torchaudio

When converting the audio on the CPU we get for instance the duration:
```
INFO: Done converting auto to text in 161.48 secs
```
Performing the same convertion on the GPU we now get:
```
INFO: Done converting auto to text in 33.66 secs
```

The command to transcribe a recording is thus:

nvp audio2text -i nervproj_0006_whisper_integration.x265.mkv

This also works with video files as input

!