Thread: [linux] mkv 720p to avi 480p

Hi everyone. Today i will teach how make a BRrip with audio Mp3
(I still can not AC3 but I'll leave the tutorial for those who want to try)

First, we need some softwares (These steps are for centos / redhat. For other distributions is similar.):

mkvtoolnix:

Code:

yum install mkvtoolnix

mediainfo

Code:

yum install mediainfo libzen0 libmediainfo0

ffmpeg

Code:

yum install ffmpeg ffmpeg-devel

mencoder

Code:

yum install mencoder

Now we have the tools let's start. (From here is the same for any distribution of Linux)

I will use the release: Insidious.2010.720p.BluRay.x264.DTS-WiKi

First with mediainfo we see the height of the video, audio format and IDs:

Code:

mediainfo Insidious.2010.720p.BluRay.x264.DTS-WiKi.mkv

Output:

Code:

Video
ID                               : 1
Format                           : AVC
Format/Info                      : Advanced Video Codec
Format profile                   : High@L4.1
Format settings, CABAC           : Yes
Format settings, ReFrames        : 8 frames
Codec ID                         : V_MPEG4/ISO/AVC
Duration                         : 1h 42mn
Bit rate                         : 6 134 Kbps
Width                            : 1 280 pixels
Height                           : 534 pixels
Display aspect ratio             : 2.35:1
Frame rate                       : 23.976 fps
Color space                      : YUV
Chroma subsampling               : 4:2:0
Bit depth                        : 8 bits
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.374

Audio
ID                               : 2
Format                           : DTS
Format/Info                      : Digital Theater Systems
Codec ID                         : A_DTS
Duration                         : 1h 42mn
Bit rate mode                    : Constant
Bit rate                         : 1 510 Kbps
Channel(s)                       : 6 channels
Channel positions                : Front: L C R, Side: L R, LFE
Sampling rate                    : 48.0 KHz

As we can see the format is DTS.

Now we separate the video and audio.

Video:

Code:

mkvextract tracks Insidious.2010.720p.BluRay.x264.DTS-WiKi.mkv 1:video.mkv;

Audio in DTS:

Code:

mkvextract tracks Insidious.2010.720p.BluRay.x264.DTS-WiKi.mkv 2:audio.dts;

AC3 audio if the video had AC3 audio instead of DTS:

Code:

mkvextract tracks Insidious.2010.720p.BluRay.x264.DTS-WiKi.mkv 2:audio.ac3;

Now we will convert audio to MP3:

Code:

ffmpeg -i audio.dts -acodec libmp3lame -ar 48000 -ab 320k -ac 2 audio.mp3

If you want to convert to AC3:

Code:

ffmpeg -i audio.dts -acodec ac3 -ac 6 -ab 448k audio.ac3;

If you want to convert from AC3 to MP3:

Code:

ffmpeg -i audio.ac3 -acodec libmp3lame -ar 48000 -ab 320k -ac 2 audio.mp3

Now we will convert video to AVI:

Code:

mencoder video.mkv -nosound -ovc xvid -xvidencopts fixed_quant=2 -vf scale=720:xxx -o video.nosound.avi;

where is the xxx will put the new height, the length is always the same 720.

To calculate the height we can use this methods:
xxx = Original Height / 1.78947 = 534 / 1.78947 = 298 (rounded)

This step is the most time consuming. It can last between 2hours and 3hours, or more in great movies.

To finish merge the audio and video:

Code:

mencoder video.nosound.avi -ovc copy -oac copy -audiofile audio.mp3 -af volume=11 -o finalName.480p.BRRip.XviD.MP3.avi;

Any doubts I'm here to clarify.

dude, how much time does it take to convert one single movie?
i think its easier to download 480p movies from trackers

thanks...

On average it takes about 2 to 3 hours. This is for those like me who like to make rips and share.

excellent, just what I was looking for.