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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/mpp/mpp_faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div>
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<div class="- topic/body concept/conbody body conbody">
|
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<section class="- topic/section section" id="mpp_common_issues__section_ezq_b13_d1c" data-ofbid="mpp_common_issues__section_ezq_b13_d1c"><h2 class="- topic/title title sectiontitle">VE 驱动未加载</h2><p class="- topic/p p" data-ofbid="d196837e36__20250123155221"><strong class="+ topic/ph hi-d/b ph b">现象</strong></p><p class="- topic/p p" data-ofbid="d196837e39__20250123155221">在
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">/dev</span> 路径下，未发现字符设备
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">/dev/aic_ve</span>。</p><strong class="+ topic/ph hi-d/b ph b">原因分析</strong><p class="- topic/p p" data-ofbid="d196837e49__20250123155221">确认内核中是否加载 VE 驱动。</p><div class="- topic/p p" data-ofbid="d196837e51__20250123155221">
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="mpp_common_issues__image_kym_vtf_d1c" src="../ve/../../../images/ve/ve-faq.jpg" width="576" alt="ve-faq"/></div><br/>
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</div></section>
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<section class="- topic/section section" id="mpp_common_issues__section_bts_yzh_d1c" data-ofbid="mpp_common_issues__section_bts_yzh_d1c"><h2 class="- topic/title title sectiontitle">解码后图像花屏</h2>
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<div class="- topic/div div">
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<div class="- topic/div div section" id="mpp_common_issues__id3">
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<strong class="+ topic/ph hi-d/b ph b">现象</strong>
|
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<p class="- topic/p p" data-ofbid="d196837e72__20250123155221">解码后的图像出现花屏现象。</p></div>
|
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<div class="- topic/div div section" id="mpp_common_issues__id4">
|
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<strong class="+ topic/ph hi-d/b ph b">原因分析</strong>
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<p class="- topic/p p" data-ofbid="d196837e80__20250123155221">逐步排除以下原因：</p><ol class="- topic/ol ol arabic simple" id="mpp_common_issues__ol_gdz_tqt_2dc" data-ofbid="mpp_common_issues__ol_gdz_tqt_2dc">
|
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<li class="- topic/li li" data-ofbid="d196837e84__20250123155221">
|
||
<p class="- topic/p p" data-ofbid="d196837e86__20250123155221">是否源文件本身有数据错误，可使用 PC 端视频播放软件或图像浏览器查看，是否有花屏现象;</p>
|
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</li>
|
||
<li class="- topic/li li" data-ofbid="d196837e90__20250123155221">
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||
<p class="- topic/p p" data-ofbid="d196837e92__20250123155221">通过保存解码帧数据，在 PC 端查看图像是否有花屏现象，如果 PC 端查看图像正常，则需要排查是否设置图像格式错误，或排查 Display
|
||
模块相关原因。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d196837e96__20250123155221">
|
||
<p class="- topic/p p" data-ofbid="d196837e98__20250123155221">码流解析是否正确，相关 VE 寄存器信息是否配置正确，具体请查看 VE Spec 说明。</p>
|
||
</li>
|
||
</ol></div>
|
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</div>
|
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</section>
|
||
<section class="- topic/section section" id="mpp_common_issues__section_tfx_d13_d1c" data-ofbid="mpp_common_issues__section_tfx_d13_d1c"><h2 class="- topic/title title sectiontitle">图像解码报错</h2><p class="- topic/p p" data-ofbid="d196837e108__20250123155221"><strong class="+ topic/ph hi-d/b ph b">现象</strong></p><p class="- topic/p p" data-ofbid="d196837e111__20250123155221">解码异常报错，未得到解码后的视频帧，或者视频帧数据出错。</p><strong class="+ topic/ph hi-d/b ph b">原因分析</strong><p class="- topic/p p" data-ofbid="d196837e115__20250123155221">逐步排除以下原因：</p><ol class="- topic/ol ol" id="mpp_common_issues__ol_nym_vtf_d1c" data-ofbid="mpp_common_issues__ol_nym_vtf_d1c">
|
||
<li class="- topic/li li" data-ofbid="d196837e119__20250123155221">
|
||
<p class="- topic/p p" data-ofbid="d196837e121__20250123155221">源文件是否是 VE 驱动支持的媒体文件格式，具体请参考模块介绍的硬件编解码格式章节。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d196837e125__20250123155221">
|
||
<p class="- topic/p p" data-ofbid="d196837e127__20250123155221">源文件是否损坏，可参考 PC 端是否可正常播放。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d196837e131__20250123155221">
|
||
<p class="- topic/p p" data-ofbid="d196837e133__20250123155221">码流解析是否正确，相关 VE 寄存器信息是否配置正确。</p>
|
||
</li>
|
||
</ol><p class="- topic/p p" data-ofbid="d196837e137__20250123155221">解码报错后，VE 驱动中返回了解码当前帧的寄存器状态信息，请参考 Spec 说明对应分析。</p></section>
|
||
<section class="- topic/section section" id="mpp_common_issues__section_fts_yzh_d1c" data-ofbid="mpp_common_issues__section_fts_yzh_d1c"><h2 class="- topic/title title sectiontitle">申请 dmabuf 失败</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d196837e145__20250123155221">log 显示 dmabuf 申请失败，或者解码程序跑飞<ol class="- topic/ol ol" id="mpp_common_issues__ol_gts_yzh_d1c" data-ofbid="mpp_common_issues__ol_gts_yzh_d1c">
|
||
<li class="- topic/li li" data-ofbid="d196837e149__20250123155221">
|
||
<p class="- topic/p p" data-ofbid="d196837e151__20250123155221">mpp heap 的是否成功初始化，生成 <span class="+ topic/ph sw-d/filepath ph filepath">/dev/dmabuf/mpp</span> 文件节点</p>
|
||
<p class="- topic/p p" data-ofbid="d196837e157__20250123155221">如果没有生成 <span class="+ topic/ph sw-d/filepath ph filepath">/dev/dmabuf/mpp</span> 文件节点，则需要增加 CMA 预留内存的大小，或者减小 mpp
|
||
heap 申请的内存大小。请查看 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="mpp_config.html">MPP 配置</a>。</p>
|
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</li>
|
||
<li class="- topic/li li" data-ofbid="d196837e168__20250123155221">
|
||
<p class="- topic/p p" data-ofbid="d196837e170__20250123155221">mpp heap 是否设置得太小，无法满足满足解码的需求</p>
|
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</li>
|
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</ol></div>
|
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</section>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#mpp_common_issues__section_ezq_b13_d1c" data-tocid="mpp_common_issues__section_ezq_b13_d1c">VE 驱动未加载</a></div></li><li class="section-item"><div class="section-title"><a href="#mpp_common_issues__section_bts_yzh_d1c" data-tocid="mpp_common_issues__section_bts_yzh_d1c">解码后图像花屏</a></div></li><li class="section-item"><div class="section-title"><a href="#mpp_common_issues__section_tfx_d13_d1c" data-tocid="mpp_common_issues__section_tfx_d13_d1c">图像解码报错</a></div></li><li class="section-item"><div class="section-title"><a href="#mpp_common_issues__section_fts_yzh_d1c" data-tocid="mpp_common_issues__section_fts_yzh_d1c">申请 dmabuf 失败</a></div></li></ul></div>
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