ffmpeg-audio-libopus-not-ogg.md

domain	contrib
title	ffmpeg audio libopus not ogg
verification	metadata-normalized
{"title"	FFmpeg 音频转码：必须用 libopus 而非 -format ogg", "domain": "audio", "tags": "", "source": "hanged-man", "status": "published", "created": "2026-03-29", "confidence": "0.9", "scope": "broad", "domain_expert": "hanged-man", "verified_date": "2026-03-29"}
created	2026-07-06
source	unknown

问题

FFmpeg 输出 OGG 文件为 0 字节。

根因

使用了不存在的 -format ogg flag。

错误写法

ffmpeg -i input.wav -format ogg output.ogg  # -format 不存在

正确写法

ffmpeg -i input.wav -ar 24000 -ac 1 -c:a libopus output.ogg

Verification

1. Follow the solution steps in order
2. Run any relevant commands or tests to confirm the fix
3. Verify the symptom no longer occurs
4. Check related logs or outputs for expected behavior

额外注意

• 交互式覆盖提示：先 os.remove(out) 删除旧文件再调用 FFmpeg
• -y flag 在 Windows MSYS2 构建下会失效