Submitted by justin on Thu, 30/04/2009 - 10:13
In our development of AVCHD Lite support for all ShedWorx products, we've come across a potentially confusing area in regard to the video format used in the new Panasonic Lumix AVCHD Lite cameras.
The AVCHD Lite format for these cameras is quoted as '50p recording' but with a disclaimer that the CCD records at 25fps.
Some users might be led to believe that the 50p format (60p for NTSC) will give them 50 frames per second. This is not the case. 50p is a signal setting stating that AVCHD Lite from these cameras will play back at 50 fields per second, from a captured video of 25 frames per second.
How does this work? Well, they provide a 50p output signal by repeating each frame's display twice.
Why would they do this? We can only assume that the 50p signal may look better on some displays (this was not that case in our tests). As an example, in non-digital cinemas, the films are provided as 24 frames per second but the projectors run at 48 cycles per second to reduce flicker.
We can tell you that there are 25 frames per second in the H.264 video stream within a AVCHD Lite video.
For now, we are converting AVCHD Lite to 25fps output (both WMV on the PC and AIC on the Mac). We have tested this approach by taking our converted AIC footage, editing in Final Cut Express, then exporting to AppleTV for playback. We've then examined the video quality by:
- playing back direct from our Panasonic DMC-FT1 via HDMI to the HDTV (Sony Bravia 46")
- copying the raw AVCHD Lite files to a PS3 and playing back
- playing back the Final Cut edited movie through an AppleTV
We have seen no noticeable difference between any of these playback options, making us confident that going from 50p to an (effective) 25p signal, still preserving the 25 frames per second that was recorded, has no effect on video quality.
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How to convert and edit AVCHD(MTS/M2TS/MOD/TOD/TS) videos ?
Note: This version is for Mac OS. If you are using Windows, please click here.
Tanbee AVCHD Converter for Mac is necessary for AVCHD camcorder users to convert and edit AVCHD videos in MTS, M2TS, TS, TP, MOD, TOD format on Mac OS X. the AVCHD converter helps you convert videos to popular mobile players such as iPod, iPhone, Apple TV, iRiver, Creative Zen, PSP, Blackberry, etc.
Import converted files to some popular applications like QuickTime, iMovie, iDVD, iTunes, etc. on Mac OS X. AVCHD Converter Lets you upload converted video to YouTube, Google, Yahoo, MySpace, etc. for sharing with others.
AVCHD Converter for Mac has powerful video editing function, such as video trimming, cropping and effect adjustment.
The AVCHD Converter for Mac can also extract and convert audio files, capture pictures from various videos, make videos out of pictures with JPG, BMP or PNG.
Only a few clicks to complete the conversion with previewing all the process on real time.
AVCHD Converter for Mac converts AVCHD(MTS/MT2S/MOD/TOD) videos to all popular HD/Common videos suitable for different mobile devices.
AVCHD Converter for Mac can be used like MTS Converter, M2TS Converter, TS Converter, MOD Converter, TOD Converter, etc.
This step-by-step guide will show you how to convert video files with this software.
Before you start, please download, install and launch
Intel Version (9.00M)
PowerPC Version (8.64M).
Step 1: Load video files
Click "Add Files" button to add video files you want. After video files are imported successfully, you will see all of them listed in the program:
Step 2: Select output format
Select one or more files in the file list, click "Profile" drop-down button, and select an output format for the selected files in the drop-down list that opens.
Step 3: Edit Video (Trim,Crop,Effect)
Select a video file in the file list, click "Trim","Crop","Effect" button to open window for edit.
Step 4: Convert
After the above settings, check the needed files to convert in the file list, and click "Convert" button on the window to start converting.
More info
http://www.avchd.converter-for-mac.com