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Well, if you want to increase it till 500 instead of 318 then do the following query in your UNA database (backup this table first):
UPDATE `sys_transcoder_filters` SET `filter_params`='a:2:{s:1:"h";s:3:"500";s:10:"force_type";s:3:"mp4";} ' WHERE `transcoder_object`='bx_timeline_videos_mp4';
And then clear all caches via Dashboard.
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