PR输出时选择“H.264"格式，输出格式就是MP4了。
具体操作方法：
1、打开PR，进入到界面，导入需要制作的项目素材。
/iknow-pic.cdn.bcebos.com/342ac65c10385343a7fd45339c13b07eca8088f6"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/342ac65c10385343a7fd45339c13b07eca8088f6?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="
https://iknow-pic.cdn.bcebos.com/342ac65c10385343a7fd45339c13b07eca8088f6"/>
2、然后在时间线上根据自己的设置，操作完成。
/iknow-pic.cdn.bcebos.com/a686c9177f3e67097e2f87ed34c79f3df8dc55f1"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/a686c9177f3e67097e2f87ed34c79f3df8dc55f1?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="
https://iknow-pic.cdn.bcebos.com/a686c9177f3e67097e2f87ed34c79f3df8dc55f1"/>
3、然后选择文件导出媒体。
/iknow-pic.cdn.bcebos.com/e7cd7b899e510fb3ef0db585d633c895d1430c88"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/e7cd7b899e510fb3ef0db585d633c895d1430c88?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="
https://iknow-pic.cdn.bcebos.com/e7cd7b899e510fb3ef0db585d633c895d1430c88"/>
4、再选择的输出格式为H246格式。这样就是MP4的格式了。
/iknow-pic.cdn.bcebos.com/0823dd54564e92581c6e7bf89382d158ccbf4e4a"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/0823dd54564e92581c6e7bf89382d158ccbf4e4a?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="
https://iknow-pic.cdn.bcebos.com/0823dd54564e92581c6e7bf89382d158ccbf4e4a"/>
5、最后在电脑保存的位置看见就是MP4的格式文件了。
/iknow-pic.cdn.bcebos.com/aec379310a55b3191eac40674ca98226cffc174f"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/aec379310a55b3191eac40674ca98226cffc174f?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="
https://iknow-pic.cdn.bcebos.com/aec379310a55b3191eac40674ca98226cffc174f"/>