Re: doubts about codecs and compressions : Compression techniques

Thanks for the answer Chris!

First of all, I used compressor 3.5.3

Here I put the settings from the info window:

MPEG4

Name: MPEG-4
Description: MPEG-4 video with AAC audio at 48kHz. Settings based off the source resolution and frame-rate.
File Extension: mp4
Estimated size: 99.99 MB
Audio Encoder
Format: MPEG4
Sample Rate: 48.000kHz
Channels: 2
Bits Per Sample: 16
AAC encoder quality: high
Data rate: 256 Kbps
Video Encoder
Format: MPEG4
Width: (100% of source)
Height: (100% of source)
Selected: 1024 x 576
Pixel aspect ratio: Square
Crop: None
Padding: None
Frame rate: 25
Frame Controls: Automatically selected: Off
ISMA Profile: 0
Variable bit rate, high quality
Enhanced Podcast: Off

MOV H264

Name: QuickTime H.264
Description: H.264 video with stereo AAC audio. Settings based off the source resolution and frame-rate.
File Extension: mov
Estimated size: unknown
Audio Encoder
AAC, Stereo (L R), 48,000 kHz
Video Encoder
Format: QT
Width: (100% of source)
Height: (100% of source)
Selected: 1024 x 576
Pixel aspect ratio: Square
Crop: None
Padding: None
Frame rate: (100% of source)
Selected: 25
Frame Controls: Automatically selected: Off
Codec Type: H.264
Multi-pass: On, frame reorder: On
Pixel depth: 24
Spatial quality: 100
Min. Spatial quality: 25
Temporal quality: 50
Min. temporal quality: 25

MPEG2

Name: Program Stream
Description: MPEG-2 Program Stream with MPEG audio at 48kHz. Settings based off the source resolution and frame-rate.
File Extension: mpeg
Estimated size: 1.3 GB
Type: MPEG-2 program stream
Video Encoder
Format: M2V
Width and Height: Automatic
Selected: 720 x 576
Pixel aspect ratio: PAL CCIR 601 (16:9)
Crop: None
Padding: None
Frame rate: (100% of source)
Selected: 25
Frame Controls: Automatically selected: Off
Start timecode from source
Aspect ratio: Automatic
Selected 16:9
Field dominance: Automatic:
Selected Progressive
Average bit rate: 17 (Mbps)
2 Pass VBR enabled
Maximum bit rate: 30 (Mbps)
High quality
Best motion estimation
Closed GOP Size: 12, Structure: IBBP
Audio Encoder
Format: MPEG
Sample Rate: 48.000kHz
Channels: 2
Bits Per Sample: 16

The problem is that with compressor I can't change pixel aspect ratio on mpeg2, so it's impossible to put it square.
And it's really strange, cause in the finder and with Quicktime dimensions are 720x404. If I use vlc it recognize the video like pal 16:9 and show it at 1024x576.