primh Posted November 2, 2020 Share Posted November 2, 2020 Long time I could not understand why I recording video with good sound, but after downloading it to youtube the result is with bad sound. I assumed problem with youtube's re-encoding (but why only in my video?). Bot now I understand that sound is getting bad after export by Videopad even if nothing changes and make lossless export. I chek it in versions 6.32-8.33 - everywhere the same. The problem is clearly audible when sounding just talk voice - low frequencies distorted to much and its sounds like some overload. Lowering the volume even to 50% doesn't help - result are quieter but with the same distored. It's very strange, considering that export are lossless and without any changes. So question - how get rid of this problem? Attached 2 files - original sound.m4a and result sound.mp4 (exported with 1*1 pixel black screen video, so it does not need export portable project) - https://drive.google.com/drive/folders/17SI6t7C8KmgHd58uC-Mo4iL4VmUaEejY?usp=sharing. Distortion audible very good, even at bad sound system like phone speaker. But especially if open both audio at audacity for example and turn on solo in rotation. Link to comment Share on other sites More sharing options...
borate Posted November 2, 2020 Share Posted November 2, 2020 Undetectable differences on a decent PC speaker system. And this is confirmed by identical waveforms, so unable to replicate your issue. Link to comment Share on other sites More sharing options...
primh Posted November 4, 2020 Author Share Posted November 4, 2020 Waveforms are different. [IMG]http://images.vfl.ru/ii/1604493972/481e6920/32179778_m.jpg[/IMG] And different are every peak, I marked just most visible. This can be seen even without approximation. Of course its not native language for you and its hard for perception, but distortion are really present and it looks like snarling at low frequency. Link to comment Share on other sites More sharing options...
borate Posted November 4, 2020 Share Posted November 4, 2020 Your waveform highlights have been noted. When reviewed with high-quality headphones there was a very subtle audible difference, to my ear. When the original was paired with a still image and exported as mp4/H264 the result was as good as the original. But, of course, this is subjective. Suggest that you test other export formats/codecs, and take a look at... https://nch.invisionzone.com/topic/31854-choice-of-video-codec-affects-audio-quality/?tab=comments#comment-84666 Link to comment Share on other sites More sharing options...
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