mencoder Linux CLI video editing how to encode video file into xvid and split by time into multiple parts

Mencoder is great, you can throw anything at it, including video files from your camera and have it encode into xvid or almost any other format.

In my case I took 640x480 video from my Canon and reduced the size by 1/3 with the options below (there are many other options that you can read about in the manual but I like to keep it simple).

Mencoder Encode

mencoder -ovc xvid -oac mp3lame -xvidencopts fixed_quant=4 -o

Mencoder Split

Split the first 9 minutes of video into a part

mencoder -endpos 00:09:00 -ovc copy -oac copy inputfile.xvid -o outputfile.xvid

*We're kind of cheating because without specifying "-ss" (the start position) it defaults to starting at the beginning which would be the same as "-ss 00:00:00"

Note that we don't need the -ss (start time) flag because we are taking the first 9 minutes of the video. It gets a little tricky (and this is not well documented or known by some) when you want to take a portion of videon in the middle (meaning not the first x minutes and not the last x minutes).

Split 9 minutes of video starting from the 9 minute point

This is where I consider mencoder to be unintuitive, here is the code I was using and lots would ask "why is mencoder ignoring the endpos"? It actually isn't, what you thought you were telling mencoder is different than what is actually happening.

Take this code for example:

mencoder -ss 00:09:00 -endpos 00:18:00 -ovc copy -oac copy inputfile.xvid -o outputfile.xvid

At first I assumed this means "start at 9 minutes" and "end at 18 minutes". Actually it means "start at 9 minutes" and "end at 27 minutes". In other words "endpos" doesn't work as I believe it should and here's why from the mencoder manual:

-endpos <[[hh:]mm:]ss[.ms]|size[b|kb|mb]> (also see -ss and -sb)
Stop at given time or byte position.
NOTE: Byte position is enabled only for MEncoder and will not be accurate, as it can only stop at a
frame boundary. When used in conjunction with -ss option, -endpos time will shift forward by seconds
specified with -ss.

So what the manual means is that endpos is relative to ss. That means if you say you "start at 5 minutes" and "end at 9 minutes", you're actually saying 5 minutes + 9 minutes = end at 14 minutes. So you can see that mencoder isn't ignoring you, it just takes the start position and adds the end position value and that is what ultimately becomes the endpos. I don't agree with that, mencoder is a great tool but I think this stumps a lot of people because it doesn't make sense.

Split 9 minutes of video from the end

mencoder -ss 00:18:00 -ovc copy -oac copy inputfile.xvid -o outputfile.xvid

*This is cheating again by just specifying the start, it will take everything from the start point until the video finishes.

In essence you're specifying "-endpos 00:27:00" assuming the movie ends at 27 minutes, but you get the idea.


Tags:

mencoder, linux, cli, editing, encode, xvid, multiple, partsmencoder, format, canon, reduced, manual, filename, avi, ovc, oac, mp, xvidencopts, fixed_quant, output, endpos, inputfile, outputfile, specifying, quot, ss, defaults, tricky, documented, portion, videon, unintuitive, ignoring, isn, doesn, hh, kb, mb, sb, byte, enabled, accurate, boundary, conjunction, specified, relative, adds, ultimately, stumps, finishes, essence,

Latest Articles

  • QEMU-KVM soundhw deprecated how to enable sound in QEMU 4.x series
  • Virtualbox Error Cannot register the hard disk because a hard disk with UUID already exists solution
  • kernel: [549267.368859] mate-terminal[7871]: segfault at 2000000101 ip 00007f5d0a9548f0 sp 00007fff7012c610 error 4 in libgobject-2.0.so.0.4800.2[7f5d0a920000+52000]
  • apcupsd how to setup and monitor APC UPS units
  • How To Password Reset, Recover, Bypass, Remove and Unlock on Windows 10,8,7,Vista,XP,NT,2000,2003,2008,2012,2016,2019 Administrative Login Programs
  • Nvidia Ubuntu Linux Screentearing Video with solution driver
  • ?? Question Marks for time, permissions and size of a file?
  • mdadm how to stop a check
  • access denied by acl file qemu-kvm: bridge helper failed
  • Linux NIC connecting at 100M instead of 1000M gigabit speeds? It could be overheating
  • "This kernel requires the following features not present on the CPU: cmov Unable to boot - please use a kernel appropriate for your CPU.
  • http://vault.centos.org/5.9/os/i386/repodata/filelists.xml.gz: [Errno -1] Metadata file does not match checksum solution
  • Linux Ubuntu Wifi Disabled Only Works When Laptop Plugged Into Wall AC Power
  • CentOS 6 impossible to compile a newer libguestfs
  • chroot
  • How To Get Started on Ubuntu with gpt-2 OpenAI Text Prediction
  • Remove cloud-init in your VM
  • QEMU-KVM KVM Command Line Practical Guide
  • Linux How To Change NIC Name to eth0 instead of enps33 or enp0s25
  • virt-resize: error: libguestfs error: could not create appliance through libvirt.