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doc: update ffmpeg.md (#24) 5f19d3feee

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@ -538,8 +538,9 @@
</span></code></pre>
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<p>合并当前目录下所有视频</p>
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line">$ ffmpeg <span class="token parameter variable">-f</span> concat <span class="token parameter variable">-safe</span> <span class="token number">0</span> <span class="token parameter variable">-i</span> <span class="token operator">&#x3C;</span><span class="token punctuation">(</span><span class="token keyword">for</span> <span class="token for-or-select variable">f</span> <span class="token keyword">in</span> ./*.mp4<span class="token punctuation">;</span> <span class="token keyword">do</span> <span class="token builtin class-name">echo</span> <span class="token string">"file '<span class="token environment constant">$PWD</span>/<span class="token variable">$f</span>'"</span><span class="token punctuation">;</span> <span class="token keyword">done</span><span class="token punctuation">)</span> <span class="token parameter variable">-c</span> copy output.mp4
<pre class="wrap-text "><code class="language-bash code-highlight"><span class="code-line">$ ffmpeg <span class="token parameter variable">-f</span> concat <span class="token parameter variable">-safe</span> <span class="token number">0</span> <span class="token parameter variable">-i</span> <span class="token operator">&#x3C;</span><span class="token punctuation">(</span><span class="token keyword">for</span> <span class="token for-or-select variable">f</span> <span class="token keyword">in</span> ./*.mp4<span class="token punctuation">;</span> <span class="token keyword">do</span> <span class="token builtin class-name">echo</span> <span class="token string">"file '<span class="token environment constant">$PWD</span>/<span class="token variable">$f</span>'"</span><span class="token punctuation">;</span> <span class="token keyword">done</span><span class="token punctuation">)</span> <span class="token parameter variable">-c</span> copy output.mp4
</span></code></pre>
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<p>合并不同规格视频，保证视频不变形</p>
<pre class="wrap-text "><code class="language-bash code-highlight"><span class="code-line">$ ffmpeg <span class="token parameter variable">-i</span> <span class="token number">1</span>.mp4 <span class="token parameter variable">-c</span> copy <span class="token parameter variable">-bsf:v</span> h264_mp4toannexb <span class="token parameter variable">-f</span> mpegts tmp1.ts
</span><span class="code-line">$ ffmpeg <span class="token parameter variable">-i</span> <span class="token number">2</span>.mp4 <span class="token parameter variable">-c</span> copy <span class="token parameter variable">-bsf:v</span> h264_mp4toannexb <span class="token parameter variable">-f</span> mpegts tmp2.ts