Conversion from mkv to mp4 file size increases

[Eco247]

Hello All
Please excuse me if this question has been asked before, but I could not find an answer in the forum.

I have been converting files from MKV to MP4 because the audio channel is EAC3 and my tv/dvd player will not use it so I use AAC instead, however when I convert the original file size of say 350Mb increases to over 850Mb and I can't seem to find out why the video seems the same.
All I want to do is a change to the audio codec?

Any help would be gratefully received.
Many thanks in advance

[unidan]

Hi, can you provide logs so we can check what you're doing?

[Eco247]

I have tried to look for log files but cannot find them, can you point me in the right direction please?

Just found out how to create a log file will post it to pastbin when done.

Completed Log File and it is at Pastebin under the following name
Link to Pastebin https://pastebin.com/GkmyC6Fs


Eco247 VLC Log 20-2-22 CP.log

Thanks in advance

[unidan]

Hi

Code: Select all

stream_out_transcode debug: source fps 1000000/41711, destination 25/1 stream_out_transcode debug: decoder aspect is 1.777778:1 stream_out_transcode debug: source pixel aspect is 1.333333:1 stream_out_transcode debug: scaled pixel aspect is 1.122807:1 stream_out_transcode debug: source 640x480, destination 760x480 stream_out_transcode debug: encoder aspect is 14440:5760 stream_out_transcode debug: source chroma: DX11, destination I420 main debug: looking for video filter module matching "fps": 46 candidates fps debug: Converting fps from 1000000/41711 -> 25/1 main debug: using video filter module "fps" main debug: Filter 'fps' (00000246dabd9390) appended to chain main debug: looking for video converter module matching "any": 24 candidates chain debug: Trying to build resize+chroma main debug: looking for video converter module matching "any": 24 candidates main debug: no video converter modules matched main error: Failed to create video converter chain debug: Trying to build chroma+resize main debug: looking for video converter module matching "any": 24 candidates main debug: using video converter module "d3d11_filters" main debug: Filter 'd3d11_filters' (00000246dabdaf10) appended to chain main debug: looking for video converter module matching "any": 24 candidates swscale debug: 640x480 (640x480) chroma: I420 -> 760x480 (760x480) chroma: I420 with scaling using Bicubic (good quality)

It seems that transcoding happens in your configuration. which changes (increase) the picture size and might pick less-efficient but faster encoding method, explaining the increase in size. :/

[Lotesdelere]

In your case you don't need to transcode the video stream, just copy it and transcode only the audio

[Eco247]

Please excuse me for being dim here but how do I copy the video and transcode just the audio?
is that done on the Mkv file or the transfer to the Mp4?

I was using a profile to change the audio, is that correct?

[Eco247]

Just figured it out using profile.
use the checkbox to keep the original video track and just change to the audio track.

Thanks for your help