PowerShell on Russian Windows outputs text in CP1251/CP866 by default.
Node.js reads stdout as UTF-8 → Cyrillic becomes mojibake.
Fix: force UTF-8 output at the start of every PowerShell command:
[Console]::OutputEncoding = [System.Text.Encoding]::UTF8;
$OutputEncoding = [System.Text.Encoding]::UTF8;
Receive stdout as raw Buffer (encoding:'buffer'), strip UTF-8 BOM
if present, then decode explicitly with .toString('utf8').
Also fixed runCommand() to collect chunks into Buffer arrays and
decode as UTF-8 (FFmpeg always outputs UTF-8 regardless of locale).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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