Can anyone help me please? (FILE SIZE after rendering)

[a941]

FILE SIZE after rendering

Got a 360p .mp4 that's 183Mb in size.
Wanted to remove a few seconds at the beginning, slightly adjust the audio volume and re-render.
Did this in Camtasia. (2019)
Camtasia's 360p .mp4 output (of this SHORTENED video) is 1.05GB - yes GIGABYTES!! WTF?!
Around TEN TIMES the size of the original 360p .mp4..!!
This is MADNESS!!

I want the output to be the same size as the original (or in this case, expected it to be slightly smaller - not 10x BIGGER!!)

Can anyone help me please?

[ProWo]

Cut the mp4 with Avidemux.
This is fast and there is no recode.

To change the audio volume you can use clever FFmpeg-GUI.
Load the cutted mp4, click main page, click encode/convert audio stream, make your changes and click encode.
If finished, click multiplex, your new audiostream is shown in green; deselect the source audiostream on the left, leave all other streams selected.
Set mp4 as container, click multiplex. Done.

[cholla]

Cut the mp4 with Avidemux.
This is fast and there is no recode.

Or you could do the Cut with Clever.
So just one program to use.

[a941]

Can anyone tell me WHY Camtasia's output is 10x bigger than original file?

[a941]

'Clever FFmpeg GUI' only available for Windows.. I'm on a mac.. - anything similar available for mac?
Tx

[Alwyn]

AVIDemux, as mentioned above.

Can anyone tell me WHY Camtasia's output is 10x bigger than original file?

Because the bitrate has been set (or defaults to), a higher rate than the original file. Look in the export settings for export bitrate adjustment.

Use MediaInfo to get the original bitrate and try to match it (or a bit more) for the new export.

[Cornucopia]

More accurately, because what you had set was re-encoding the whole thing (and it likely WAS higher as Alwyn mentioned) rather than use an I-frame based cutting method. It is very likely that Camtasia has no understanding of I-frame cutting, so it HAS to re-encode (the whole thing).


Scott

[Alwyn]

@A941, have a look at this Camtasia tute:

https://www.techsmith.com/learn/tutorials/camtasia/export-share/

In particular, note the "quality" setting in the Advanced options:


[Attachment 87312 - Click to enlarge]

Reduce the quality to achieve the file size you want.

@Scott, why would re-encoding "the whole thing" necessarily change the size if the encoding bitrate is set to be similar to the original? It's already an MP4.

[Cornucopia]

@Alwyn,

It probably would not (although it may not be able to "hit the target" as well as the previous encoder), but can be a waste of the OP's time and loss of quality regardless, if I-frame based cutting could avoid a long re-encode but isn't used due to inability of the app.

Scott