Ffmpeg question - best practice

I have a script i saved and have used for a while without any issues;
#!/bin/bash
for i in *.mkv
do
ffmpeg -i "$i" -acodec ac3 -vcodec copy "${i%.mkv}.mp4"
done
which gives me;
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (ac3 (native) -> ac3 (native))
My question is, is it better for me to copy the audio instead and is AC3 -> AC3 going to give me an issue?
Sometimes i get AAC souce audio which is why i specify AC3

psjbeisler wrote:is AC3 -> AC3 going to give me an issue?
No, other than wasting time re-encoding. You probably wouldn't notice a difference in quality. If something weird happens, like a change in channel layout, then it should be reported upstream.
psjbeisler wrote:Sometimes i get AAC souce audio which is why i specify AC3
AAC is the most common audio format for MP4 container, so stream copying it would be the best option.
qubodup wrote:
You could check what the codec is:
codec=`ffprobe video.mkv 2>&1 >/dev/null |grep Stream.*Audio | sed -e 's/.*Audio: //' -e 's/[, ].*//'`
You can avoid the redirection, grep, and sed (see FFmpeg Wiki: FFprobe Tips).
$ ffprobe -v error -select_streams a:0 -show_entries stream=codec_name -of default=nw=1:nk=1 input.mkv
aac
Note that only the first audio stream will be probed in this example. If there are others they will be ignored. Change "-select_streams a:0" to "-select_streams a" if you want to list all.
Last edited by DrZaius (2015-04-18 23:41:57)

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ON TO MY ACTUAL DILEMMA aka Convert to XML or not?
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I've watched some tutorials on Lynda.com and havent yet seen a clear answer to a very simple question:
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I'm not an idiot, I'm simply green with this -- and it's kind of scary because I genuinely want us to proceed forward with the most flexible, reliable, trainable and sustainable solution. A tall order, I know. Correct me if I'm wrong, but XML is that beast, no?
Formatting the XML
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Regards-
Robert

From what I've gleaned through watching Lynda tutorials on the subject is that what I'm hoping to do is indeed possible.
Peter, I dont disagree with you that there is a steep learning curve for me as the instigator / designer of this method for our team, but in terms of my teammates and end-users that will be softened considerably. Even so I'm used to steep learning curves and the associated frustrations -- but I cope well with new learning and am self taught in many tools and programs.
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The issue then again comes down to data organization in the XML file. In order to use this method the data must be organized in the same order in which it will be displayed. For example if I had a Lastname field, and a Firstname field in that order, I could not call the Firstname first without faulting the document using the flow method. I could, however, still drag and drop content from each tag into the frame and it would populate correctly regardless of the order of appearance in the XML.
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Question - Best practice data source for Vs2008 and Crystal Reports 2008

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This is already being discuss in one of your other threads. Let's close this one out and concentrate on the one I've already replied to.
Thanks

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Best regards,
John

Hi K,
Sorry for the long long delay in responding I've been traveling - and thanks for the e-mail tickler too...
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Michael:
Take a look at this camera here:
http://www.camcorderinfo.com/content/Canon-DC100-Camcorder-Review.htm
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I posted this in the ADDT forum, but I imagine I'll get more
responses here:
All you database developers - how do you deal with primary
keys? Do you
ALWAYS use an AutoIncrement/AutoNumber? Or only sometimes? Is
there an
argument to NOT use AutoIncrement? I know how I create
databases and how
I usually do things. I know how a few of my colleagues work.
But how
about the rest of the world? (Research for a MS Access book I
am
involved with.)
Alec
Adobe Community Expert

.oO(Alec)
>I posted this in the ADDT forum, but I imagine I'll get
more responses here:
>All you database developers - how do you deal with
primary keys? Do you
>ALWAYS use an AutoIncrement/AutoNumber?
No.
>Or only sometimes? Is there an
>argument to NOT use AutoIncrement?
AUTO_INCREMENT is a proprietary MySQL feature. For some
people this
might be an argument against it, but doesn't have to. Every
DBMS has its
own special features. You just have to decide whether you
want to keep
your code/queries as portable as possible or want to get the
most out of
your DB. Usually I prefer performance/features over
portability, simply
because for me and my projects it's very unlikely that I have
to change
the DBMS. I've chosen MySQL for good reasons and will stay
with it for
quite a while.
>I know how I create databases and how
>I usually do things. I know how a few of my colleagues
work. But how
>about the rest of the world? (Research for a MS Access
book I am
>involved with.)
It always depends on the table itself, what data it contains,
what I
want to do with it and also some personal preferences. In n:m
tables for
example there's no need for an extra numeric PK, since the
entire record
already is the PK, built from two or more FKs.
But if I need a numeric PK, I usually use sequences. Some
DBMS support
them natively, in MySQL they can be emulated with an extra
table. It
simply means, that the used PK number is generated _before_
the record
itself is inserted. For me and my framework this has some
advantages
(makes the internal work a bit easier), but of course in
other cases an
AUTO_INCREMENT might be more appropriate.
So IMHO there's no general solution. If an AUTO_INCREMENT or
something
similar fits your needs, you should use it. I don't see a
real problem
with that.
Micha

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I have 3 Areas for my DWH
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thanks and regards
Andreas

Andreas,
I guess the correct is depends... Without kidding, are you planning to use a flat star table for this dimension? If that is the case you would be joining the sources together and loading this into the table.
Now this sounds way to simple, so I guess there is something more to the question...
Jean-Pierre

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Essbase 11.1.1.3 (Windows 2003)
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Robert

AS i know addUser(User user){ ... } is much more useful for several reasons:
1.Its object oriented
2.its easy to write , because if Object has many parameters its very painful to write method with comma seperated parameters

Best Practices Question: How to send error message to SSHR web page.

Best Practices Question: How to send error message to SSHR web page from custom PL\SQL procedure called by SSHR workflow.
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Writing information into a log or table at the database level works for trouble-shooting, but we’re looking for something that will provide the end-user with an intelligent message that the workflow has failed.
Thanks ahead of time for your responses.
Rich

We have implemented the same kind of requirement long back.
We have defined our PL/SQL procedures with two OUT parameters
1) Result Type (S:Success, E:Error)
2) Result Message
In the PL/SQL procedure we always use below construct when we want to raise any message
hr_utility.set_message(APPL_NO, 'FND_MESSAGE_NAME');
hr_utility.raise_error;
In Exception block we write below( in successful case we just set the p_result_flag := 'S';)
EXCEPTION
WHEN APP_EXCEPTION.APPLICATION_EXCEPTION THEN
p_result_flag := 'E';
p_result_message := hr_utility.get_message;
WHEN OTHERS THEN
p_result_flag := 'E';
p_result_message := hr_utility.get_message;
fnd_message.set_name('PER','FFU10_GENERAL_ORACLE_ERROR');
fnd_message.set_token('2',substr(sqlerrm,1,200));
fnd_msg_pub.add;
p_result_message := fnd_msg_pub.get_detail;
After executing the PL/SQL in java
We have written some thing similar to
orclStmt.execute();
OAExceptionUtils.checkErrors (txn);
String resultFlag = orclStmt.getString(provide the resultflag bind no);
if ("E".equalsIgnoreCase(resultFlag)){
String resultMessage = orclStmt.getString(provide the resultMessage bind no);
orclStmt.close();
throw new OAException(resultMessage, OAException.ERROR);
It safely shows the message to the user with all the data in the page.
We have been using this construct for a long time for all our projects. They are all working as expected.
Regards,
Peddi.

Quick question regarding best practice and dedicating NIC's for traffic seperation.

Hi all,
I have a quick question regarding best practice and dedicating NIC's for traffic seperation for FT, NFS, ISCSI, VM traffic etc. I get that its best practice to try and separate traffic where you can and especially for things like FT however I just wondered if there was a preferred method to achieving this. What I mean is ...
- Is it OK to have everything on one switch but set each respective portgroup to having a primary and failover NIC i.e FT, ISCSI and all the others failover (this would sort of give you a backup in situations where you have limited physical NICs.
- Or should I always aim to separate things entirely with their own respective NICs and their own respective switches?
During the VCAP exam for example (not knowing in advance how many physical NIC's will be available to me) how would I know which stuff I should segregate on its own separate switch? Is there some sort of ranking order of priority /importance? FT for example I would rather not stick on its own dedicated switch if I could only afford to give it a single NICs since this to me seems like a failover risk.

I know the answer to this probably depends on however many physical NICs you have at your disposal however I wondered if there are any golden 100% rules for example FT must absolutely be on its own switch with its own NICs even at the expence of reduced resiliency should the absolute worst happen? Obviously I know its also best practice to seperate NICs by vender and hosts by chassis and switch etc

Best Practice EJB 3.0 Question

I have a web application consisting of 3 projects:
- Model (EJB 3.0 Session Beans connected to two different databases)
- TagLibrary (custom tag library)
- ViewController (Web App / GUI)
Currently I am connecting to the EJB Beans using code that Jdeveloper generates for a test client:
env.put( Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory" );
env.put(Context.PROVIDER_URL, "t3://localhost:7101");
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My question is following:
What is best practice for Session beans in the Model project to access other session beans in the same project? Do I also need to specify JNDI prop file and settings? (This occurs when Bean from one database needs to access bean from another database).
Or should I really put these in two separate projects / EJB libraries?
Thanks,
Kris

You have two options, first is to use JNDI lookup (you should be able to use just new InitialContext(), without the environment map).
Second one is more elegant and, as far as I'm concerned, should be referred to as best practice, that is using dependency injection:
@EJB
YourSesionBeanInterface yourEJB;
If you get stuck, there is plenty of documentation about this on the internet.
Pedja

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