readme : add instructions on converting to GGML + "--no-config" to wget (#874)

README.md

@@ -71,6 +71,8 @@ Then, download one of the Whisper models converted in [ggml format](models). For
 bash ./models/download-ggml-model.sh base.en
 ```
 
+If you wish to convert the Whisper models to ggml format yourself, instructions are in [models/README.md](models/README.md).
+
 Now build the [main](examples/main) example and transcribe an audio file like this:
 
 ```bash

models/README.md

@@ -1,15 +1,17 @@
 ## Whisper model files in custom ggml format
 
 The [original Whisper PyTorch models provided by OpenAI](https://github.com/openai/whisper/blob/main/whisper/__init__.py#L17-L27)
-have been converted to custom `ggml` format in order to be able to load them in C/C++. The conversion has been performed
-using the [convert-pt-to-ggml.py](convert-pt-to-ggml.py) script. You can either obtain the original models and generate
-the `ggml` files yourself using the conversion script, or you can use the [download-ggml-model.sh](download-ggml-model.sh)
-script to download the already converted models. Currently, they are hosted on the following locations:
+are converted to custom `ggml` format in order to be able to load them in C/C++.
+Conversion is performed using the [convert-pt-to-ggml.py](convert-pt-to-ggml.py) script.
+
+You can either obtain the original models and generate the `ggml` files yourself using the conversion script,
+or you can use the [download-ggml-model.sh](download-ggml-model.sh) script to download the already converted models.
+Currently, they are hosted on the following locations:
 
 - https://huggingface.co/ggerganov/whisper.cpp
 - https://ggml.ggerganov.com
 
-Sample usage:
+Sample download:
 
 ```java
 $ ./download-ggml-model.sh base.en
@@ -21,6 +23,16 @@ You can now use it like this:
   $ ./main -m models/ggml-base.en.bin -f samples/jfk.wav
 ```
 
+To convert the files yourself, use the convert-pt-to-ggml.py script. Here is an example usage.
+The original PyTorch files are assumed to have been downloaded into ~/.cache/whisper
+Change `~/path/to/repo/whisper/` to the location for your copy of the Whisper source:
+```
+mkdir models/whisper-medium
+python models/convert-pt-to-ggml.py ~/.cache/whisper/medium.pt ~/path/to/repo/whisper/ ./models/whisper-medium
+mv ./models/whisper-medium/ggml-model.bin models/ggml-medium.bin
+rmdir models/whisper-medium
+```
+
 A third option to obtain the model files is to download them from Hugging Face:
 
 https://huggingface.co/ggerganov/whisper.cpp/tree/main

models/download-ggml-model.sh

@@ -62,7 +62,7 @@ if [ -f "ggml-$model.bin" ]; then
 fi
 
 if [ -x "$(command -v wget)" ]; then
-    wget --quiet --show-progress -O ggml-$model.bin $src/$pfx-$model.bin
+    wget --no-config --quiet --show-progress -O ggml-$model.bin $src/$pfx-$model.bin
 elif [ -x "$(command -v curl)" ]; then
     curl -L --output ggml-$model.bin $src/$pfx-$model.bin
 else