Lossless MPEG trimmer needed

tk_mac

macrumors member
Original poster
Dec 26, 2019
49
7
What software should I use if I want to be able to trim junk off beginning and end of a MPEG video losslessly without re-encoding the entire video?

Thanks
 

lars666

macrumors 65816
Jul 13, 2008
1,050
951
Wouldn't Quicktime work, too? Or doesn't it read the codec of your video(s)?
 

tk_mac

macrumors member
Original poster
Dec 26, 2019
49
7
Avidmuex should work well for the purpose it allow for a simple copy of the selected part of the video without a re-encode.

What setting or preference do I need to ensure it will make my cut at the nearest possible point in time to where I select without reencoding (instead of reencoding to hit my cut point more exactly)?
 

MacUser2525

macrumors 68000
Mar 17, 2007
1,948
290
Canada
What setting or preference do I need to ensure it will make my cut at the nearest possible point in time to where I select without reencoding (instead of reencoding to hit my cut point more exactly)?
Just use the time line to get to your start point and set it, then go to your end and set that. Make sure both the audio and video are set to copy and choose the save the new video to a different name. Just fired it up for a quick test marker A is the start point setting the marker B your end point, then the save gives you the option to rename or put in different directory then wait a few seconds while it does the copying of the selected part to new file.
 

Cayenne1

macrumors member
Jun 21, 2016
36
19
Knoxville, TN
I've been using QuickTime to trim MP4 files some over 1 GB in size.

Open the MP4 and select "Trim" under "Edit". What I like is you can click and hold down on the beginning or end markers and it expands the frames to allow for a finer selection. Then click "Trim" and select "Save" under "File". A new lossless MP4 is created minus the frames trimmed.

I use this feature to chop a large MP4 file into clips to reassemble later through QuickTime as well.

Note: My original files come from old DV tapes copied to my disk from an old camcorder as a folder of VOB files, (usually over 4GB per tape). These files in turn were converted to one large MP4 file with WinX DVD Converter for Mac ($). I've also tried MakeMKV (free) to convert the VOB files to an MKV file that could then be converted to an MP4. That last approach had issues.