mathiasandClaude Sonnet 5.5
4352446f36
Replaces whisper-server --convert. A zero exit that wrote nothing is an error. Also fixes the red test's stub, which wrote an empty file and so (correctly) tripped the no-output check. Checked against real ffmpeg on iguana with the same argv: AAC .m4a in, pcm_s16le 16000 Hz mono WAV out, duration preserved. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
46 lines
1.6 KiB
Go
46 lines
1.6 KiB
Go
package audio
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import (
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"context"
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"fmt"
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"os"
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"os/exec"
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"strings"
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)
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// FFmpeg converts any audio container to the strict format whisper wants: 16 kHz
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// mono signed 16-bit PCM WAV (ADR-033). It ALWAYS transcodes, even when the input
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// already is that format — a Teams export often is, and the transcode is then
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// nearly free; assuming it would be the bug. This replaces whisper-server's
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// --convert, whose --tmp-dir is created at process start and rots under macOS
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// periodic cleanup.
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type FFmpeg struct {
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// Bin is the ffmpeg executable ("ffmpeg" resolves via PATH).
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Bin string
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}
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// ToWAV writes src, converted, to dst. Video streams are dropped (-vn): by now the
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// file has already been probed as audio-only, but a cover-art stream must not end
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// up in the WAV.
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func (f *FFmpeg) ToWAV(ctx context.Context, src, dst string) error {
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bin := f.Bin
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if bin == "" {
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bin = "ffmpeg"
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}
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cmd := exec.CommandContext(ctx, bin,
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"-y", "-v", "error", "-i", src, "-vn", "-ac", "1", "-ar", "16000", "-c:a", "pcm_s16le", "-f", "wav", dst)
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cmd.WaitDelay = killGrace
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if out, err := cmd.CombinedOutput(); err != nil {
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if ctxErr := ctx.Err(); ctxErr != nil {
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return fmt.Errorf("audio: ffmpeg: %w", ctxErr)
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}
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return fmt.Errorf("audio: ffmpeg: %w: %s", err, strings.TrimSpace(string(out)))
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}
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// A zero exit that wrote nothing is still a failure: never hand whisper a
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// missing file and let the error surface three layers later.
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if info, err := os.Stat(dst); err != nil || info.Size() == 0 {
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return fmt.Errorf("audio: ffmpeg wrote no output at %s", dst)
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}
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return nil
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}
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