Hi, I have this problem when I encode a composition of an after effect project.The composition length about 1 hour.I'm using After Effect 2017 and Media Encoder 2017. The problem is that when I'm playing the video the sound is out of quality(but the original sound file is clear also in after effect do not have any problem too)
I've tried all available file format in adobe media encoder but still have problem.
Note:- The sound of the video is like have some cut
Have you tried to adjust the audio settings? Try an uncompressed audio codec, like PCM.
Usually with heavily compressed audio results in very poor quality.
Also, in case you need compression, try to avoid mp3. Go for AAC instead. Check the bitrate and sample frequencies.