# What should I do if the audio cannot be played or the transcoding has not been completed for a long time?

<div data-elink-language-switch="1" id="bkmrk-%E4%B8%AD%E6%96%87" style="border:1px solid #d6d9de;border-radius:6px;padding:10px 12px;margin:0 0 18px 0;background:#f8fafc;font-size:14px;">[中文](/books/250cf/page/371bc)</div><span style="font-size:14px;font-family:arial, helvetica, sans-serif;">To provide a better course learning experience for students, we aim to improve the audio quality. Currently, elink supports audio uploads of up to 500MB and is compatible with mp3 (recommended) and m4a audio formats.</span>

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<span style="font-family:arial, helvetica, sans-serif;color:rgb(51,51,51);letter-spacing:0px;vertical-align:baseline;font-size:14px;">Through testing and research, some merchants have reported the following audio issues:</span>

<span style="font-family:arial, helvetica, sans-serif;font-size:14px;">**<span style="color:rgb(51,51,51);letter-spacing:0px;vertical-align:baseline;">Common audio issues:</span>**<span style="color:rgb(51,51,51);letter-spacing:0px;vertical-align:baseline;">**Unable to play on WeChat, audio resources unavailable, audio file transcoding not completed after a long time**</span></span>

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<span style="font-family:arial, helvetica, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);letter-spacing:0px;vertical-align:baseline;">Most of these problems are due to issues with the original recorded files,</span><span style="font-weight:bold;color:rgb(51,51,51);letter-spacing:0px;vertical-align:baseline;">such as audio file format incompatibility with the player (e.g., WeChat player), outdated audio formats, corrupted recorded files, or only changing the file extension without actually converting the format when changing the file format.</span><span style="color:rgb(51,51,51);letter-spacing:0px;vertical-align:baseline;">elink recommends the following solutions for video transcoding for your reference:</span></span>

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<span style="font-family:arial, helvetica, sans-serif;font-size:14px;">1. <span style="color:rgb(51,51,51);letter-spacing:0px;vertical-align:baseline;">Use Format Factory (recommended),</span><span style="font-family:PingFangSC;color:rgb(53,53,53);background:rgb(255,255,255);letter-spacing:0px;vertical-align:baseline;">Video Editing Expert and other Windows tools</span><span style="color:rgb(51,51,51);letter-spacing:0px;vertical-align:baseline;">to transcode (convert the format) to mp3 format for normal playback.</span></span>

**How to use Format Factory to generate audio files compatible with the WeChat player?**

**<span style="font-size:14px;">I. Select appropriate editing and transcoding software</span>**

<span style="font-size:14px;">For video editing and transcoding: We recommend commonly used Windows software such as Format Factory and Video Editing Expert. Download address:[http://www.pcgeshi.com/](http://www.pcgeshi.com/)</span>

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**<span style="font-size:14px;">II. Select an appropriate video format</span>**

<span style="font-size:14px;">For the final video format, it is recommended to choose the MP3 format.</span>

**<span style="font-size:14px;">III.<span style="font-size:14px;">Software operation process (taking Format Factory as an example):</span></span>**

<span style="font-size:14px;">① Click to output MP3</span>

<span style="font-size:14px;">![image.png](https://wechatapppro-1252524126.file.myqcloud.com/help_document/image/ueditor/72233000_1701831950.png ".png")</span>

<span style="font-size:14px;">② Click to add files</span>

<span style="font-size:14px;">![image.png](https://wechatapppro-1252524126.file.myqcloud.com/help_document/image/ueditor/63317000_1701832050.png ".png")</span>

<span style="font-size:14px;">③ Click to configure output</span>

<span style="font-size:14px;">![image.png](https://wechatapppro-1252524126.file.myqcloud.com/help_document/image/ueditor/81994400_1701832261.png ".png")</span>

<span style="font-size:14px;">④ Set the audio as needed. Usually, no changes are required. After confirming that everything is correct, click the OK button in the lower right corner.</span>

<span style="font-size:14px;">![image.png](https://wechatapppro-1252524126.file.myqcloud.com/help_document/image/ueditor/65462300_1701832333.png ".png")</span>

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<span style="font-size:14px;">⑤ You can see that the file is being converted. Wait for the transcoding to succeed.</span>

<span style="font-size:14px;">![image.png](https://wechatapppro-1252524126.file.myqcloud.com/help_document/image/ueditor/1559500_1701832234.png ".png")</span>

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<span style="font-size:17px;">**Upload the processed audio to elink**</span>

<span style="font-size:14px;">After processing, you can upload it to elink. We recommend that you play it on a mobile device. If it does not meet the requirements, you can check the size of the original audio and the processing steps.</span>