New guy...MP4 resolution question

[azmark]

Hi,

My name is Mark and I'm new here. I would like to learn how to reduce the resolution on video files. I have MP4 and .avi files that I want to work with. I'm new to Linux but I'm not a computer newbie. I have avidemux on my machine but I can't figure out how to do what I want to do with it. Can somebody help me out?

[assen]

Hi,

Install ffmpeg from RPMFusion repository. It will do the job.

WWell,

[Fenrin]

hi,

For conversion of videos you could use such programs like ogmrip, handbrake, arista or the firefox extension firefogg. Arista is not in the Fedora or rpmfusion repo, therefore you would have to compile it.

If your also happy with command line programs, you could use ffmpeg2theora, ffmpeg or h264enc

Personally I use ffmpeg2theora and Arista. Ogmrip is not bad either.

[azmark]

Okay. I got the program and extracted it. How do I install it? Sorry, I have no clue what I'm doing.

[Fenrin]

I just noticed that with ogmrip you can only rip DVD's but not rip single videofiles. So this program probably doesn't fit your needs.

to install ffmpeg, ffmpeg2theora you first have to install the rpmfusion repos

su
rpm -Uvh  http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm   http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm

Then install these packages via yum.

yum install ffmpeg ffmpeg2theora

If you want to try out handbrake you can download it here. To install it use "rpm -ivh HandBrake*.rpm" from the place where you saved this rpm package.

The Arista website is here, but if you don't have experience with compiling of programs you maybe better try the alternatives first.

a short example how you could use ffmpeg2theora:

ffmpeg2theora -x 768 -y 432 -v 7 -a 0 --optimize 'inputfile.mp4' -o 'outputfile.ogv'

But in this example you have first to cd to the path where the videofile inputfile.mp4 is stored, e.g. if it's in /home/user/Videos then "cd /home/user/Videos". To see the different options of ffmpeg2theora use "ffmpeg2theora --help"

[ryzingsrinivas]

hi,
i am using fedora 11 64bit.
myscreen resolution was decreased to 800*600.
i tried in display settings but at that no more than 800*600.
how to improve my screen resolution.

from two days iam facing this problem.

help me.
...............
srinu

[Fenrin]

Originally Posted by ryzingsrinivas

...

Do you have a NVIDIA card and are you using the Noveau drivers or did you install the proprietary NVIDIA driver?

If you use the Noveau driver then I suggest that you try the proprietary NVIDIA driver. If you have to use the Noveau driver, maybe this guide in the Arch Linux wiki can help you: https://wiki.archlinux.org/index.php...nitor_settings and also this Nouveau#Configuration.

This advice is maybe useful in your case (but it is probably much easier to install the proprietary NVIDIA driver):

If, for some odd reason, the nvidia drivers don't set the correct DPI, you can turn off auto-detection:

Option "UseEdidDpi" "false"

You would add this option in the 10-monitor.conf file below the monitor section.

[bonedome]

Hello
seems this thread has been hijacked
for the resizing of videos using ffmpeg see here http://dnmouse.org/forum/viewtopic.p...b102a3513f9b72 for a basic resize try this command

ffmpeg -i ~/videos/input.mp4 -acodec copy -s 480x272 -vcodec libx264 -vpre hq -vpre main -level 21 -refs 2 -b 384k -threads 0 ~/videos/output.mp4

the resolution is forced by the -s the -b is the bitrate I have the bitrate very low for 480x272 (psp/ipod friendly size) as it gives a good enough quality for the small screen and very small file size.
Note: setting -b is only setting an average bitrate and the default tolerance is +/-300k
Instead of -b 384k you can also use -crf 25 (constant rate factor), which according to man ffmpeg is better for 1 pass encoding, 25 is the lowest bitrate and 1 the highest, I found 25 to be around 400k.
You can press q at anytime during encoding to check the results

Edit: if you want to use aac for audio you'll have to build ffmpeg yourself, it's pretty easy http://dnmouse.org/forum/viewtopic.p...852bff0b29f08f


assen

Install ffmpeg from RPMFusion repository. It will do the job.

as superb as ffmpeg is it's not magic, it still needs to be told what to do