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It only takes a minute to sign up. I would like to convert a Mp4 file in HD into a Mp4 file of lower resolution. Is there any software that can be used for this? The part about mencoder that you want is the parameter -vop scale which tells mencoder to what scale you want the video to go to.

This is normal if you want to reduce bandwidth use, lower video size, etc.. Although from my experience is better to include additional information for video and audio like the one above. Where -i is for the original input file, -s is for the size for each frame and the name of the output final goes in the end. I use it a lot when going from ogg to mp4 with h. Lowers A LOT the size. For size you can use all. There a lot of additional options that you can play with.

Do man avconv to know more. You'll then be asked to specify an output file, and you can choose a profile and tinker with it, e. Ubuntu Community Ask! Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Need to downsample video to a lower resolution Ask Question.

Asked 7 years, 11 months ago. Active 3 years, 3 months ago. Viewed k times. Braiam Active Oldest Votes. Terminal commands Which by default are not installed are: MENCODER Install it by sudo apt-get install mencoder mencoder The part about mencoder that you want is the parameter -vop scale which tells mencoder to what scale you want the video to go to.

Luis Alvarado Luis Alvarado k gold badges silver badges bronze badges. Avidemux can resize. Had to set it to transcode first. I can't get mencoder to work Cannot find codec 'mp4' in libavcodec Couldn't open video filter 'lavc'.

Openshot doesn't give much control bunch of presets, none are what I needed over output and created files that played at the wrong speed or had choppy audio. For the avconv time there has to be a problem. I did a 1 hour 23 minute movie in mp4 format with h in about 25 minutes with an i3.

With an i7 it went down to 11 minutes. That's what worked for me, using a 64 bits Manjaro: mencoder MAH Use avconv. Type in terminal avconv -i input. Instead, if you don't have avconv , you could use ffmpeg.

Install: sudo apt-get install ffmpeg Convert: ffmpeg -i input. Zanna I tried avconv. It is giving me command not found. I tried everything mentioned above. It is giving me the same answer. It would be really useful if you could suggest an alternate solution. See if the edit works. Doesn't work, Ubuntu And -strict -2 does not change the error.

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Best way to downsample audio [Linux]

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Here's an example of how you can downsample all color, gray and mono images to 72dpi with a Ghostscript commandline:. This default value will only downsample images with a value of dpi or higher and leave the other ones untouched. Try moonshiner , a GUI to ghostscript. For a scanned document in which each page is a full color image, I used a combination of the command line above and another that I found on a different site,. Each of my pages was a color scan of a document.

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By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up. I would like to convert a Mp4 file in HD into a Mp4 file of lower resolution. Is there any software that can be used for this? The part about mencoder that you want is the parameter -vop scale which tells mencoder to what scale you want the video to go to.

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By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. It only takes a minute to sign up. Is there any Linux command one can use to sample subset of a file? For instance, a file contains one million lines, and we want to randomly sample only one thousand lines from that file. For random I mean that every line gets the same probability to be chosen and none of the lines chosen are repetitive. I know I can always write a python script to do so but just wondering is there a command for this usage. And at least for now non-ancient versions added in a commit from , that will use reservoir sampling when appropriate, meaning it shouldn't run out of memory and is using a fast algorithm.

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I often find in a situation in which I receive very large videos that need to be compressed for being transferred or somehow managed. Here is the procedure, which is more a note to self, but will hopefully help people facing the same problem. These are valid both for Windows and Ubuntu, and are focused on the task of reducing the size of an mp4 video no format conversion. Hoewever, extension to other tasks is simple and I might treat it in future posts. Click on it Figure 2. Playing with Bitrate and Frame Rate parameters might be an option, but if you are not expert you might end up with a very low quality video.

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