Trial, the reason for this program blown up file sizes by a factor of 20 or more is due to the fact that ALL DIMO converter based products DO NOT USE SENSIBLE BITRATES in ALL their output profile templates and NEVER HAVE since before they first starting plying their cut down products by this website several years ago. This is a common complaint and is completely ignored by Dimo because they obviously do not care if the product is percieved as good or garbage. To make any constructive use of this companies video conversion/ripping products the end user MUST KNOW the desired/necesary output files bitrate and manually input that including the kbps characters too i.e. replacing "9000 kbps" default vlaue with "750" will crash most codecs as it will be parsed as 750 bits per second and that will break most codecs internal mathematics but replacing it with "750 kbps" for a codec like x264 or HEVC or xvid will likely produce the desired results (depending upon output video dimensions of course)

Trial,

The .flv format is just a container, same as .avi, .mp4, .mkv etc. Like the Dimo HD Converter on GOTD recently, Dimo FLV Converter limits the kinds of videos you can import, and sells it at lower cost than their premiere product, Video Converter Ultimate. FLV Extract is an older app that strips the audio & video out of an .flv file -- there are likely other apps & methods -- which doesn't alter the original video, so it's the same size & quality. Otherwise the quality & size of converted video depends on several factors...

The bigger the frame size the more pixels to store the larger the file, but remember that reducing the frame size reduces quality too. The method of video compression matters, as do the encoder settings. H.264 & H.265 are more efficient, & so can maintain higher quality by compressing the video less for a given file size. But they each have various encoder settings, e.g. quality, that will increase quality & time to encode or process. Maybe the most important encoder setting is Bit Rate, which determines the amount of video compression & thus the file size. There's no reason to set the bit rate higher than the original -- there simply isn't any extra quality to be found by increasing the bit rate beyond its current level, and all it will do is increase file size, as you've found with your .mp4 conversions. Popular software called Media Info will usually give you the bit rate of a video file -- use it on the original and set the conversion bit rate to that or less, problem solved.

Trial, I never noticed that one could not add a list of files to be converted and configure the queue and just start off the queue and it then proceed through the list one at a time... I only ever tested it with a single file and ASSUMED it handled queue in a normalsensible manner but it does NOT! In addition to not processing the queue lists it does not let us configure items in the list individually... ALL listed videos have to have the same output profile settings applied and have to be launched individually or all at the same time. My reply to your other comment explains the stupidly large default output file sizes so won't go into it again here. If you set any lossy video converter to crazy almost lossless bitrates then you'll get apparent good quality or no visible quality loss but if you over compress by using the wrong codec like using an h263 codec and select a bitrate that is sensible for h265 codec you will get a file that is smaller but visibly very damaged... you have to choose both the best codec your player can play and a sensible bitrate, frame rate and resolutions to compromise the file size and qualative requirements. Even with this poorly designed FFMPEG based GUI.

TK,

Thank you very much, TK, for your very informative comments, they are utmost helpful and constructive!

(And yes, just like FeMaster states it, once I will have converted a bunch of very old .flv files, there will not be any more need for such a converter.)