doc: update docs/ffmpeg.md (#835) c249e0e609

docs/ffmpeg.html

@@ -304,7 +304,11 @@ FFmpeg 参考，为开发人员分享快速参考备忘单。">
 
 
 
-<table><thead><tr><th align="left">:-</th><th>-</th></tr></thead><tbody><tr><td align="left"><code>-ab bRate</code></td><td>设置音频比特率(单位 kbit/s)</td></tr><tr><td align="left"><code>-aframes N</code></td><td>设置要录制的音频帧数 [-frames:a 的别名]</td></tr><tr><td align="left"><code>-aq q</code></td><td>设置音频质量(特定于编解码器，VBR) [-q:a 的别名]</td></tr><tr><td align="left"><code>-an</code></td><td>禁用录音</td></tr><tr><td align="left"><code>-acodec codec</code></td><td>设置音频编解码器。[-codec:a 的别名] 使用 'copy' 复制流。</td></tr><tr><td align="left"><code>-vol</code></td><td>以 256 的倍数更改音频音量，其中 256 = 100%(正常)音量。例如 512 = 200%</td></tr><tr><td align="left"><code>-newaudio</code></td><td>将新的音频流添加到当前输出流</td></tr><tr><td align="left"><code>-alang code</code></td><td>设置当前音频流的 ISO 639 语言代码(3 个字母)</td></tr></tbody></table>
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+<table><thead><tr><th align="left">:-</th><th>-</th></tr></thead><tbody><tr><td align="left"><code>-ab bRate</code></td><td>设置音频比特率(单位 kbit/s)</td></tr><tr><td align="left"><code>-aframes N</code></td><td>设置要录制的音频帧数 [-frames:a 的别名]</td></tr><tr><td align="left"><code>-aq q</code></td><td>设置音频质量(特定于编解码器，VBR) [-q:a 的别名]</td></tr><tr><td align="left"><code>-an</code></td><td>禁用录音</td></tr><tr><td align="left"><code>-acodec codec</code></td><td>设置音频编解码器。[-codec:a 的别名] 使用 'copy' 复制流。</td></tr><tr><td align="left"><code>-vol</code></td><td>以 256 的倍数更改音频音量，其中 256 = 100%(正常)音量。例如 512 = 200%</td></tr><tr><td align="left"><code>-newaudio</code></td><td>将新的音频流添加到当前输出流</td></tr><tr><td align="left"><code>-alang code</code></td><td>设置当前音频流的 ISO 639 语言代码(3 个字母)</td></tr><tr><td align="left"><code>-ac nTract</code></td><td>指定立体声通道数（n个声道）。例如 nTract = 2 即2个声道</td></tr></tbody></table>
 </div></div></div></div></div><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="视频编辑"><a aria-hidden="true" tabindex="-1" href="#视频编辑"><span class="icon icon-link"></span></a>视频编辑</h2><div class="wrap-body">
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