Builds ffmpeg arguments for a plain stream-copy trim, written directly to MP4. Used when both boundaries are already keyframe-aligned — no encode, no join needed.
Source media path.
Output media path.
Trim start in seconds within the source file.
Trim end in seconds within the source file.
ffmpeg argument vector.
Builds ffmpeg arguments for a plain stream-copy trim, written directly to MP4. Used when both boundaries are already keyframe-aligned — no encode, no join needed.