Improvements to synthesis via filelist and simple filenames

[roedoejet]

PR Goal?

This PR does a couple small improvements to the synthesis operation in FS2 and STTS2. First, it implements the suggestion in #716 to allow simple basename synthesis when given a filelist. If you pass --simple-filenames then you just get the basename.wav

it also implements synthesizing with a filelist for STTS2 and fixes a small bug in the demo. All tested on trained models.

Assisted by Claude Sonnet 5

Fixes?

#716

Feedback sought?

rubber stamping, confirmation that the simple-filenames feature works as intended.

Priority?

medium

Tests added?

Some basic tests added

How to test?

Should work with existing models

Confidence?

pretty high

Version change?

Related PRs?

EveryVoiceTTS/FastSpeech2_lightning#154
EveryVoiceTTS/StyleTTS2#24

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
everyvoice/base_cli/prediction_writing_callback.py	52% smaller
everyvoice/demo/app.py	47% smaller
everyvoice/model/e2e/StyleTTS2_lightning	0% smaller
everyvoice/model/feature_prediction/FastSpeech2_lightning	0% smaller

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.22%. Comparing base (cb28ffc) to head (bb15dd4).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
everyvoice/demo/app.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #853      +/-   ##
==========================================
+ Coverage   85.21%   85.22%   +0.01%     
==========================================
  Files          51       51              
  Lines        4706     4710       +4     
  Branches      699      700       +1     
==========================================
+ Hits         4010     4014       +4     
  Misses        535      535              
  Partials      161      161              

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[joanise]

Generally looks good. Effective solution. There's a test that fails in CI in fs2, and comments in both sub PRs.
I have reviewed the code changes carefully and the -h output, but I have not tested running synthesize. I assume Marc will be in a better position to do so.

[joanise]

Looks good, thanks!

Conflicting submodule changes pushed, now you'll have to merge and/or rebase the submodules and redo a clean submodule update in this top-level PR.