How to port your own pre-rendered cutscene over to Sonic Adventure 2

Ubuntu guide

1. Download and install all of the necessary components, such as FFmpeg and Audacity:
sudo apt-get update && sudo apt-get install ffmpeg audacity playonlinux wine
2. Create a virtual drive in PlayOnLinux. Configure your Wine prefix so that it replicates Windows 98. Install Dreamcast Movie Maker. Don't forget about the shortcut!
3. Now open your video in Audacity. The project rate shouldn't be above 48000 Hz. Export it as a WAV file, choose "WAV (Microsoft) signed 16-bit PCM".
4. Open your WAV in Dreamcast Movie Maker, untick "Use identical files" and import your file as an audio file. Choose the "Sofdec Audio (.sfa)" type below. Press the "Start Encoding" button and you're done!
5. Open your terminal and access the directory your videofile is in. Type the following command:
ffmpeg -i yourfilename.mp4 -q 1 output.m1v
6. Unpack SFDMux and move your *.sfa file and *.m1v file to its directory. Open the terminal in its directory once again and type:
wine Sfdmux.exe -V=yourvideofile.m1v -A=youraudiofile.sfa -S=output.sfd
In case if you want to have separate audio tracks for English and Japanese dubs, use this command instead:
wine Sfdmux.exe -V=yourvideofile.m1v -A=youraudiofileJPN.sfa -A=youraudiofileENG.sfa -S=output.sfd

Windows guide

1. Install FFmpeg and Audacity. You can Google them easily.
2. Dreamcast Movie Maker installer requires backwards compatibility mode with Windows 98. After you're done with setting that, install the program. No further action related to backwards compatibility is required, the app itself works fine on Windows 10.
3. Now open your video in Audacity. The project rate shouldn't be above 48000 Hz. Export it as a WAV file, choose "WAV (Microsoft) signed 16-bit PCM".
4. Open your WAV in Dreamcast Movie Maker, untick "Use identical files" and import your file as an audio file. Choose the "Sofdec Audio (.sfa)" type below. Press the "Start Encoding" button and you're done!
5. Open your command line and access the directory your videofile is in. Type the following command:
ffmpeg -i yourfilename.mp4 -q 1 output.m1v
6. Unpack SFDMux and move your *.sfa file and *.m1v file to its directory. Open the command line in its directory once again and type:
Sfdmux.exe -V=yourvideofile.m1v -A=youraudiofile.sfa -S=output.sfd
In case if you want to have separate audio tracks for English and Japanese dubs, use this command instead:
Sfdmux.exe -V=yourvideofile.m1v -A=youraudiofileJPN.sfa -A=youraudiofileENG.sfa -S=output.sfd