Parses the latest non-negative time=HH:MM:SS.ms value from ffmpeg stderr.
Used as a fallback when yt-dlp delegates muxing to ffmpeg without [download] …% lines.
Parameters
chunk: string
stdout/stderr fragment from yt-dlp/ffmpeg.
Returns number
Elapsed output seconds when present, otherwise null.
Parses the latest non-negative
time=HH:MM:SS.msvalue from ffmpeg stderr. Used as a fallback when yt-dlp delegates muxing to ffmpeg without[download] …%lines.