docs/FAQ.md

## Frequency Asked Question

**Q: `ffmpeg` is not recognized as an internal or external command**

In Linux, you can install the ffmpeg via `conda install ffmpeg`. Or on Mac OS X, try to install ffmpeg via `brew install ffmpeg`. On windows, make sure you have `ffmpeg` in the `%PATH%` as suggested in [#54](https://github.com/Winfredy/SadTalker/issues/54), then, following [this](https://www.geeksforgeeks.org/how-to-install-ffmpeg-on-windows/) installation to install `ffmpeg`.

**Q: Running Requirments.**

Please refer to the discussion here: https://github.com/Winfredy/SadTalker/issues/124#issuecomment-1508113989


**Q: ModuleNotFoundError: No module named 'ai'**

please check the checkpoint's size of the `epoch_20.pth`. (https://github.com/Winfredy/SadTalker/issues/167, https://github.com/Winfredy/SadTalker/issues/113)

**Q: Illegal Hardware Error: Mac M1**

please reinstall the `dlib` by `pip install dlib` individually. (https://github.com/Winfredy/SadTalker/issues/129, https://github.com/Winfredy/SadTalker/issues/109)


**Q: FileNotFoundError: [Errno 2] No such file or directory: checkpoints\BFM_Fitting\similarity_Lm3D_all.mat**

Make sure you have downloaded the checkpoints and gfpgan as [here](https://github.com/Winfredy/SadTalker#-2-download-trained-models) and placed them in the right place. 

**Q: RuntimeError: unexpected EOF, expected 237192 more bytes. The file might be corrupted.**

The files are not automatically downloaded. Please update the code and download the gfpgan folders as [here](https://github.com/Winfredy/SadTalker#-2-download-trained-models).

**Q: CUDA out of memory error**

please refer to https://stackoverflow.com/questions/73747731/runtimeerror-cuda-out-of-memory-how-setting-max-split-size-mb

``` 
# windows
set PYTORCH_CUDA_ALLOC_CONF=max_split_size_mb:128 
python inference.py ...

# linux
export PYTORCH_CUDA_ALLOC_CONF=max_split_size_mb:128 
python inference.py ...
```

**Q: Error while decoding stream #0:0: Invalid data found when processing input [mp3float @ 0000015037628c00] Header missing**

Our method only support wav or mp3 files as input, please make sure the feeded audios are in these formats.