when no voice comes at the time of video streaming on Roku player that issue is occurred due to wrong setting of the audio section. Simply follow these steps to fix it.
1. Visit in the setting of the Roku device.
2. Click on audio setting option.
3. If you are using S/PDIF cable for audio connection then move to Dolby digital mode.
4. If you are using HDMI cable then move on Dolby Digital/DD+ mode.
If you are still facing this issue then call on Roku 800 number 1-800-296-1402 anytime.