Differences between MPEG2 and H264

I have just purchased a HD PVR to record HD from the TV. A bonus is that it connects to our wireless network and I can view and play files on my PC (which is in another room). I have an HD video camera but usually render the output to DVD PAL so I can burn a DVD and watch it on the TV. Now I can output in HD without the need for a Blu Ray burner, I am wondering what format I should be choosing for the final output:
1. MPEG2 1080i 25 fps OR
2. H.264 1080i 25 fps
The file size is about 15-20% smaller with H264, but it's the quality that is of most importance to me.

What are your output bitrate settings?
For fast moving subjects (sports) setting the bitrate higher is needed... I will guess the same is true when the camera moves as you describe
I know that for a DVD (all I create) I have the maximum bitrate on an Encore render set to 8... since you are going HD, you should check into those settings

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Difference between mpeg2 and mpeg2 dvd

I want to build a DVD project using 1920X1080p footage. I would like to know the best export settings for doing so.
When I choose the mpeg2 dvd option I see that it adds black bars to the sides of my footage, mpeg2 however still fits the frame perfectly. Can I just use mpeg2 to export a project to be burn to DVD, and what is the difference between the two?
Thanks in advance

PeterAnsell wrote:
Ok, understood, but it terms of the difference between MPEG2-DVD (with the black bars) and MPEG2 (without them); can either be used to build a DVD project? I'd rather not have the black bars.
Thanks for your time
To clarify, MPEG-2 DVD is DVD-compliant. When you add that file to Encore, it will NOT need to transcode (get re-encoded again). A regular MPEG-2 file, or any other format for that matter, will be transcoded to a DVD-compliant MPEG-2 format. So stick with MPEG-2 DVD.
About the black bars, I believe you are referring to the narrow pillarboxing seen in the Output Preview? Those are a by-product of the math not coming out exactly when converting from HD to SD. The default setting is "Scale to Fit", just change to "Scale to Fill" to eliminate the bars. I believe that Fill option started with CS6, older versions may require that you set cropping but I don't know the recommended crop settings.
Jeff Pulera
Safe Harbor Computers

Minimum difference between average and peak bitrage in mpeg2?

is there a technical reason why compressor insists on certain minimum differences between average and peak bitrate when compressing to mpeg2?
when analyzing other footage, i regularly see material where the difference is much smaller than what compressor will allow me to do.
for instance; i'm seeing material that is compressed at 4.7 average with a peak at 5.2. compressor insists on setting the peak at 5.5 when the average is 4.7 ...

Well, compression theory says that, ideally, the max bit rate would be double the average bit rate. But since since life often gets in the way of theoretical perfection, Compressor 2 imposes a minimum 1 Mbps difference. This is partially touched upon in the DVDSP 4 manual. From page 64:
Since the VBR methods are most effective when the maximum bit rate is about double the basic bit rate, or at least 1 to 3 Mbps higher than the basic bit rate, the Max Bit Rate setting is forced to be higher than the Bit Rate setting.
Now, while Compressor 2 is coded for a 1 Mbps difference, it doesn't always follow that, in my experience. There are instances when, footage permitting, Compressor uses average bit rates lower than specified as well as never hitting the max bit rate that you've set (but it really does depend on the footage).

Media Foundation Source or H264 / AC3 differences between Windows and Phone 8?

I've got a working Matroska (MKV) Media Foundation Source for a Windows Store app (PC x86). It will play several different matroska files that contain H264 encoded video and AC3-encoded audio. It even has seek support. I've written the app
as a HTML/typescript Universal app with the MF Source as a C++ dll.
The problem is that the same code will not work on Windows Phone 8. I can play videos that don't require the external MF Source (i.e. MP4 files and AVI files) just fine on both platforms through my app, but the same MKV videos that played on an x86
PC will not play on Windows Phone 8 (Lumia 920).
I looked at the specs for the Snapdragon processor and it should be able to support both H264 at 720p resolution and AC3 (2-channel only). So I don't know what else I need to do to get this to work on WP8. The audio I'm trying to play is actually
6-channel, so that made me wonder if it was failing because WP8 supports 2-channel max, but I would have thought the audio just wouldn't work and the video would play normally.
Does anyone have any suggestions?
*edit* - just to be more specific, I can parse the file and create the presentation descriptor without errors. But when I finish opening the file and call the event for that, nothing else happens. What is weird is that the javascript video player
never throws the "canplay" event, nor does it throw the "error" event.
Lee McPherson

Thanks, not a bad suggestion to try.
On my Windows machine, I tried to get the MediaEncodingProfile via the createFromFileAsyc method. With a known file type, it outputs all properties of the video and audio streams (bitrate, etc). With an MKV file (container file with H264 video
and AC3 audio), I only get the type and subtype properties. Everything else is zero or null. This is because in my MFSource, I only set the type and subtype. This still allows the video to play on my windows machine. I assume the
built-in MFTransform for H264 video-to-uncompressed video parses the stream to get the relevant information. Likewise for audio.
On Windows Phone, when querying the file's MediaEncodingProfile, I get the same result. This is telling me that my MFSource will parse the file properly and set the subtypes for video and audio correctly. Everything else is still null or zero.
However, the file does not play. There is no returned event to the video element that it even *can* play.
Perhaps, I need to fill in the video and audio stream properties on the Windows Phone version. I really don't want to because that would mean having to parse some of the underlying video and audio streams themselves, not just parsing the container
information. (More work!) But this is what I mean when I ask about the differences between Windows and Windows Phone... perhaps the WP8.1 & Windows MFTransforms are different?
*EDIT* - I do get a JavaScript Console error that I didn't notice before: AUDIO/VIDEO: unknown MIME type. (VS error code: MEDIA12899)
Lee McPherson

Difference between Null and null?

What is the difference between null and NULL?
When is each used?
Thanks,

veryConfused wrote:
There is a null in java, but no NULL. null means no value. However, when assigning value, the following is different:Although the empty String has no special role. Null means, the referential type is not assigned (doesn't refer) to a specific object. The empty String is just another object though, so seeing it or pointing it out as something special when it actually isn't at all (no more special than new Integer(0) or new Object[0]) just adds to the confusion.

Difference between GUI_UPLOAD and WS_UPLOAD

Hi,
Please make me clear about the difference between GUI_UPLOAD and WS_UPLOAD. In which cases we need to use these modules...??
Thanks,
Satish

I would suggest to always use the GUI_UPLOAD. I say this because this is the function module which is used in the GUI_UPLOAD method of the class CL_GUI_FRONTEND_SERVICES.   Really, you should probably use the class/method instead of the function module.
data: filename type string.
filename = p_file.
call method cl_gui_frontend_services=>gui_upload
         exporting
              filename                = filename
              filetype                = 'ASC'
         changing
              data_tab                = iflatf
         exceptions
              file_open_error         = 1
              file_read_error         = 2
              no_batch                = 3
              gui_refuse_filetransfer = 4
              no_authority            = 6
              unknown_error           = 7
              bad_data_format         = 8
              unknown_dp_error        = 12
              access_denied           = 13
              others                  = 17.
Regards,
Rich Heilman

Difference between char and varchar, also the difference between varchar2

Hi,
Can anyone explain me the difference between char and varchar, and also the difference between varchar and varchar2...

Varchar2 is variable width character data type, so if you define column with width 20 and insert only one character to tis column only, one character will be stored in database. Char is not variable width so when you define column with width 20 and insert one character to this column it will be right padded with 19 spaces to desired length, so you will store 20 characters in the dattabase (follow the example 1). Varchar data type from Oracle 9i is automaticlly promoted to varchar2 (follow example 2)
Example 1:
SQL> create table tchar(text1 char(10), text2 varchar2(10))
2 /
Table created.
SQL> insert into tchar values('krystian','krystian')
2 /
1 row created.
SQL> select text1, length(text1), text2, length(text2)
2 from tchar
3 /
TEXT1 LENGTH(TEXT1) TEXT2 LENGTH(TEXT2)
krystian 10 krystian 8
Example 2:
create table tvarchar(text varchar(10))
SQL> select table_name,column_name,data_type
2 from user_tab_columns
3 where table_name = 'TVARCHAR'
4 /
TABLE_NAME COLUMN_NAME DATA_TYPE
TVARCHAR TEXT VARCHAR2
Best Regards
Krystian Zieja / mob

The difference between Lion and Mountain Lion

Can some one explain to me the difference between Lion and Mtn Lion? I'm currently 10.6.8 Is it beneficiall for me to upgrade?

Mountain Lion is an enhanced version of previous OS X and so that is Mavericks.
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System requirements for OS X Lion
System requirements for OS X Mountain Lion
OS X Mavericks: System Requirements
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The difference between N80 and N80IE ?

What is the difference between M80 and N80ie?

02-Jan-2007
07:45 PM
korngear wrote:
The Nokia N80 Internet Edition is a new version of this handset with the same hardware as the normal N80. It is due for release in Q4 of 2006 and will be available in Patina Bronze or Pearl Black, and has the following additional software included.
Yahoo Go! for Mobile
Flickr
Some Amazon Branded Software
'Download!' App management
Internet Telephone - SIP VOIP Frontend
WLAN Wizard
Gizmo VOIP - Gizmo Project VOIP Frontend.
\\en.wikipedia.org//
@Korngear
Thanks.
Could N80 be upgraded to N80IE?

The difference between SFP+ and X2

Dear Expert,
I need to know what is the difference between SFP+ and X2! and can I use SFP+ card and module instead of X2?
Thanks,
Mohammad Saeed

Hi,
They are both used for 10Gig interfaces. The difference is the connector type.
SFP+ is LC and X2 is SC.
You can not put an SFP+ into an X2 slot or X2 optic into a SFP+.
HTH

Difference between ok_code and sy-ucomm

Hi,
Can any one tell me the difference between ok_code and sy-ucomm

Hi,
Actually OK_CODE and SY-Ucomm are the same. But experts suggest use of OK code for following reason:
In each PAI event that a user triggers by choosing either a pushbutton on the screen or an element in a GUI status, the corresponding function code is placed into the system field SYST-UCOMM or SY-UCOMM and placed in the OK_CODE field (as long as the function code is not empty). Empty function codes are placed in neither the SY-UCOMM field nor the OK_CODE field.
In your ABAP programs, you should work with the OK_CODE field instead of SY-UCOMM. There are two reasons for this: Firstly, the ABAP program has full control over fields declared within it, and secondly, you should never change the value of an ABAP system field. However, you should also always initialize the OK_CODE field in an ABAP program for the following reason:
In the same way that the OK_CODE field in the ABAP program and the system field SY-UCOMM receive the contents of the corresponding screen fields in the PAI event, their contents are also assigned to the OK_CODE screen field and system field SYST-UCOMM in the PBO event. Therefore, you must clear the OK_CODE field in the ABAP program to ensure that the function code of a screen is not already filled in the PBO event with an unwanted value. This is particularly important when the next PAI event can be triggered with an empty function code (for example, using ENTER). Empty function codes do not affect SY-UCOMM or the OK_CODE field, and consequently, the old field contents are transported.

What is difference between abstraction and encapsulation ?

Hi,
I am trying to figure out the difference between abstraction and encapsulation but confused.
Both are used for data hiding then what is the exact difference ?
Thanks.

Tushar-Patel wrote:
I am trying to figure out the difference between abstraction and encapsulation but confused.
Both are used for data hiding then what is the exact difference ?This is the picture I have:
When you encapsulate something you get an inside and an outside. The outside is the abstraction. It describes how the encapsulated entity behaves viewed from the outside. This is also called the type. Hidden inside is the implementation. It holds detail information about how the type's behaviour is accomplished.
It's a very simplified picture but I think it's quite accurate and it works for me.

What is difference between Iterator and Collection Wrapper?

Hi all,
I dont understand the actual difference between Iterator and Collection Wrapper. I observed both are used for the same purpose. Could any one please let me know when to use Collection Wrapper and when to use Iterator??
Thanks,
Chinnu.

L_Kiryl is right.
Collections support global iteration (through collection->get_next( )) and local iteration (through iterator->get_next( )).
Each collection has a focus object. Initially, the first object has the focus.
Any global iteration moves the focus, which is published by the event FOCUS_CHANGED of the collection.
If you want to iterate on the collection without moving the focus (and without triggering timeconsuming follow-up processes) you can use local iteration. To do so, request an iterator object from the collection and use this to iterate.
And one more advantage of using iterator: it takes care of deleted entities. If you use global iteration then when you reach deleted entity it will be an exception. But there is no exception with iterator in the same situation.

What is difference between modify and update i am using

hi
what is difference between mofify and update
my requiremen is to have three condition checkec while mofifying or updating from a internal table
the three fields are
cus no
status
date these all are primary key in the database table
so which sould i use modify or update
there might be entry already existing in database table or new entry to be created if already existin it should check on the primary keys and updatat if not it should add a record
pls suggest whihc to use and how to implement the check on teh threee primary key
like if modify ztable from table it_test
now where condition ? can be used or not with modify? and if yes how
if not should i use update will update create a new entry if no entry is there and please give syntex
regards
Arora

Hi Nishant Arora,
Modify: It works in performing two actions.
They are: Insert + Update.
For Example If a record that is exited in database, so you are modifying that record, it updates that particular record.
Similarly, If the is not existed in the database, you are modifying it, it inserts a new record.
Update: Update means just it updates the status, I mean it only updates the record. It doesn't inserts any new record if that particular record is not present in the database.
These are the cases you need to write these statements.
Syntaxes: :
Go through this links please.,
http://help.sap.com/saphelp_nw04/helpdata/en/e7/968aa8b2384dd9835f91e7f8470064/content.htm
http://help.sap.com/saphelp_nw70/helpdata/en/fc/eb35eb358411d1829f0000e829fbfe/content.htm
Reward points if useful
Cheers,
Swamy Kunche
Edited by: Swamy Kunche on Jun 11, 2008 2:41 PM

What is Difference between SXMB_MONI and SXMB_MONITOR?

what is Difference between SXMB_MONI and SXMB_MONITOR?
Can any explain to this question.please?

Hello,
Both are same.
SXMB_MONI is area menu which will contain all multiple transactions pertaining to monitoring.
SXMB_MONI contains some functions viz monitoring for Bridging, Archived Msgs, Job overview, persistence layer analysis.
SXI_monitor directly leads to the message monitoring for the IS, which is part of the SXMB_MONI.
SXI_MONITOR directly executes the monitoring report.
Thanks,
Satya

Differences between MPEG2 and H264

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