ffmpeg 日常使用命令 | 泠泫凝的异次元空间

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datetime="2022-08-03T10:14:47+08:00"><a class="notlink"><i class="fa-solid fa-file-pen" aria-hidden="true"/><p>2022年8月3日更新</p></a></div><div class="new-meta-item date"><a class="notlink"><i class="fa-solid fa-book-open-reader" aria-hidden="true"/><p>预计阅读3分钟</p></a></div><div style="margin-right:10px"><span class="post-time"><span class="post-meta-item-icon"><i class="fa fa-keyboard"/> 全文约815字</span></span></div></div><hr/></div></section><section class="article typo"><div class="article-entry" itemprop="articleBody"><link rel="stylesheet noopener" type="text/css" href="https://cdn.jsdelivr.net/npm/hexo-tag-hint@0.3.1/dist/hexo-tag-hint.min.css" target="_blank"/><p>自用ffmpeg压制命令详解</p><a id="more"/><h2 id="公共参数"><a href="#公共参数" class="headerlink" title="公共参数"/>公共参数</h2><ul><li><code>-i</code>：输入（input）文件；</li><li><code>-crf</code>：控制输出文件质量，该参数取值范围为0~51，该参数值越大文件质量越差，但文件会越小，值为0时为无损（输出和输出质量相同），同时该参数对压制时间也有影响；</li><li><code>-lavfi "subtitles=sub.ass"</code>：定义一个复杂的过滤图，这里是相当于将输入文件当作底片，将<code>subtitles</code>覆盖于“底片”之上；</li><li><code>-c:v</code>和<code>-c:a</code>：控制编码过程中对视频（v）和音频（a）的编码方式，当该参数为<code>copy</code>时代表复制源文件的编码格式（不做编码直接复制），执行<code>ffmpeg -codecs</code>可以查看本机支持的编解码格式；</li></ul><h2 id="软字幕"><a href="#软字幕" class="headerlink" title="软字幕"/>软字幕</h2><p>软字幕是相对于硬字幕而言的，硬字幕是以图形方式直接“写”在帧上方（参考Ps中的“合并图层”）；软字幕则是以文本的方式存储于文件中单独的某个轨道上（参考Pr的多轨道）。</p><h3 id="提取"><a href="#提取" class="headerlink" title="提取"/>提取</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br/></pre></td><td class="code"><pre><span class="line">ffmpeg -i Source.mkv -map 0:s:0 subs-out.srt</span><br/></pre></td></tr></table></figure><p>以上代码假设了视频的名称为<code>Source.mkv</code>，其中：</p><ul><li><code>-i</code>参数后面跟随输入带有<strong>软字幕</strong>的文件；</li><li><code>-map</code>指出提取的是视频中的哪部分；<ul><li>后面跟着的第一个0是指「第一个视频（流）」（这里只有一个视频（流））；</li><li>s指的是「subtitles字幕」；</li><li>最后的0指字幕中的第一个（因为视频可以含有多个字幕文件）；</li></ul></li><li>最后的文件名<code>subs-out.srt</code>是输出的文件名。</li></ul><h3 id="删除"><a href="#删除" class="headerlink" title="删除"/>删除</h3><p>使用<code>-sn</code>开关删除软字幕。</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br/></pre></td><td class="code"><pre><span class="line">ffmpeg -i <span class="string">"Source.mkv"</span> -vcodec copy -acodec copy -sn <span class="string">"Output-No-Subs.mkv"</span></span><br/></pre></td></tr></table></figure><h3 id="压入"><a href="#压入" class="headerlink" title="压入"/>压入</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br/></pre></td><td class="code"><pre><span class="line">ffmpeg -i <span class="string">"Source.mkv"</span> -i sub.ass -codec copy -map 0 -map 1 <span class="string">"Output.mkv"</span></span><br/></pre></td></tr></table></figure><h2 id="精准切割"><a href="#精准切割" class="headerlink" title="精准切割"/>精准切割</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br/></pre></td><td class="code"><pre><span class="line">ffmpeg -ss 00:00:00.000 -accurate_seek -to 00:14:07.468 -i Source.mkv -lavfi <span class="string">"subtitles=sub.ass"</span> -crf 21 -c:a copy <span class="string">"Output.mp4"</span></span><br/></pre></td></tr></table></figure><p>该行命令的解释为：从<code>00:00:00.000</code>开始在<code>Source.mkv</code>中<strong>精确寻找</strong>到<code>00:14:07.468</code>并裁切下来，同时压入名为<code>sub.ass</code>的字幕，质量参数为<code>21</code>，音频轨道编码方式直接复制源文件编码格式，输出文件为<code>"Output.mp4"</code>。</p><p>注意，只有在输入文件（<code>-i</code>）在查找参数（<code>-accurate_seek</code>）后面时精确查找才会生效。</p><h2 id="压制"><a href="#压制" class="headerlink" title="压制"/>压制</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br/></pre></td><td class="code"><pre><span class="line">ffmpeg -i <span class="string">"Source.mkv"</span> -c:v h264_nvenc -lavfi <span class="string">"subtitles=sub.ass"</span> -crf 21.5 -c:a copy <span class="string">"Output-Main.mp4"</span></span><br/></pre></td></tr></table></figure><h2 id="关于NVENC"><a href="#关于NVENC" class="headerlink" title="关于NVENC"/>关于NVENC</h2><p>NVENC是由NVIDIA开发的一个API，允许使用NVIDIA GPU显卡执行h.264和HEVC（H.265）编码。FFmpeg通过<code>h264_nvenc</code>和<code>hevc_nvenc</code>编码器支持NVENC。</p><p>要想在ffmpeg中使用NVENC，你需要一个支持硬件编解码的英伟达GPU、英伟达GPU驱动程序（最好是最新的Studio（SD）版）、在编译时配置了<code>--enable-nvenc</code>的ffmpeg二进制文件。</p><p>查看是否支持，只需在命令窗口执行<code>ffmpeg -codecs</code>，在返回中查找：</p><ol><li>在<code>configuration</code>（编译配置参数）中必须要有<code>--enable-nvenc</code>；</li><li>在下方的编解码器支持中必须有如下行（<code>Encoder</code>中必须要有<code>h264_nvenc</code>）：</li></ol><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br/></pre></td><td class="code"><pre><span class="line">DEV.LS h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_qsv h264_cuvid ) (encoders: libx264 libx264rgb h264_amf h264_mf h264_nvenc h264_qsv )</span><br/></pre></td></tr></table></figure><p>如果显卡驱动版本过低或硬件不支持会报错，根据错误提示升级显卡驱动或升级硬件即可。</p></div><section class="meta" id="footer-meta"><hr/><div class="new-meta-box"><div class="new-meta-item date" itemprop="dateUpdated" datetime="2022-08-03T10:14:47+08:00"><a class="notlink"><i class="fa-solid fa-file-pen" aria-hidden="true"/><p>最后更新于 2022年8月3日</p></a></div><div class="new-meta-item meta-tags"><a class="tag" href="/tags/FFmpeg/" rel="nofollow"><i class="fas fa-hashtag" aria-hidden="true"/> <p>FFmpeg</p></a></div><div class="new-meta-item share -mob-share-list"><div class="-mob-share-list share-body"><a class="-mob-share-qq" title="QQ好友" rel="external nofollow noopener noreferrer noopener" 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