Converting MPEG2 Muxed back to Dv

I'm working on a video project, and the person doing the filming keeps sending me muxed mpeg2 video. I've had it professionally converted to DV, but was wondering if there is a way to do it in Final Cut Studio, or if there was some freeware that would also do the trick.

Shawn
you're absolutely right. however, transfering broadcast files using high bitrate MPEG compression as an intermediate codec is quite common. the real issue is whether you intend to recompress to a lossy codec later ...
.. that said, we have received high bitrate MPEG's which were transcoded to DVCPRO50 using MPEG Streamclip, dubbed to DigiBeta and later digitised, compressed and broadcast from our MPEG servers ... i'd challenge anyone to tell which spots have been through that loop.

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Convert mpeg2 to mpeg4?

Hello all,
I bought a Hitachi DZ-GX3200 DVD camcorder a while back, before I purchased my new iMac. The Hitachi camcorder unfortunately only has a USB connection. I found a way around this by installing the software that comes with the camera, which has allowed me to save videos to my hard disk. However, the videos are in MPEG2 format, and iMovieHD won't import them. And that is where I'm stuck right now.
Do you know of any software that would allow me to convert MPEG2 files to MPEG4? Alternatively, can you think of any other suggestions (aside from buying a new camera -- I dropped 700 bucks on this thing 6 months ago ) that might help me? I'd really appreciate it.

http://www.apple.com/quicktime/mpeg2/
More info about the MPEG-2 Playback Component. Please read the FAQ page before you buy.
http://www.squared5.com/svideo/mpeg-streamclip-mac.html
More info about MPEG Streamclip.
Muxed file formats (MPEG 1 and 2 and Flash) have all the audio and video "tracks" inside a single file. QuickTime (and Apple's "i" apps) can't extract the audio portion of these formats. MPEG Streamclip can extract all the tracks and convert them to DV Stream (.dv) which is the format used by iMovie.

MPEG2 Muxed - No Audio

I just bought a Sony Handycam DCR-SR80 Hard Drive based camera. The file format it records in is MPEG2 Muxed. Now, everything is fine when you record it and play it back in every app besides quicktime, imovie, itunes. Obviously everything is centered around quicktime. My question is, after laying down 800 dollars for this camera, will quicktime and all my other apps support this camera without me having to use other apps to convert the files? Is there a way I can get imovie alone to work? Thanks

Question: since hard drive based camcorders seem to be the future, anyone have any insight as to whether and when Apple will upgrade its apps (QT, iMovie, Final Cut Express, etc) to integrate the new technology? Is there any way to import audio with my MPEG2 files into iMovie/iDVD or Final Cut Express?This is probably a "not gonna happen" type thing. Basically, there are two forces working against it.
This first is the fact that the MPEG-2 format is, to be frank, somewhat old and not worth the time and trouble when newer, more efficient formats like MPEG-4/AVC (H.264) are available for handling HD content at MPEG-2 data rates.
The second is the difference in technology involved. Basically, audio and video content can be synchronized either in terms of time or space. QT employs "temporal" relationships for its "frame-to-frame" synchronization strategy while both "muxed" and interleafed files employ "spatial" relationships. For instance, MPEG-1/MPEG-2 audio/video data is stored in alternating "blocks" of autio and video data in a single stream or track. As such, it remains synchronized because one form of data cannot physically "overrun" or "outrun" the other. AVI, while assigning audio and video data to separate streams, are physically interleaved in order to maintain synchronization. (Think of this as two separate tracks with "meshed cogs" which force the relative speed of one track to remain constant in comparison to the other. Lastly, you have QT synchronization which is based on an arbitrary unit of time which is used as a "frame of reference" for synchronization. This approach offers both advantages and disadvantages. For instance, QT technology does not require that every audio or video frame of data be played. This means the QT structure can have a wider range of platform CPU power requirements with older, less CPU intensive formats. (I.e., an older platform simply drops more and more frames during playback until the structure finally decides it can no longer keep up.) On the other hand, any reliance on a time reference means the playback software is very sensative to loss or absence of timing reference data. (Ever wonder about those "timecode breaks" and why part of an MPEG2 file appears to be missing or why a QT file won't load a file when it can't find a proper file termination?)
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I changed from i iphone 5 back to a iphone 4.. now my itunes does not recognise that i have a iphone 4! how do i convert my last back up (on iphone 5) to my new iphone 4?

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Convert an EXE back to a VI?

Hello all,
I'm just getting started with Labview. My question is in regards to the possiblity of converting an EXE back to a VI. We have diagnostic software that we use on our equipment and would like to make some modifications to some timing features due to recent hardware/software upgrades. We'd also like to switch most of the current hardware (ISA DAQ's) to a more modern portable setup (preferably PCMCIA or USB DAQ's). Is it possible to convert back to VI's so we can make the changes or do we need to start from scratch and rewrite the VI's? The originals were written a long time ago and the engineers are long since gone.
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Message Edited by kehander on 01-31-2008 01:44 PM

Since 10.6.3 - Quicktime: MPEG2 muxed without audio

as subject...
since 10.6.3 Update, I have no audio on MPEG2 muxed video, what was fine before as well as on my 10.6.2 backup.
I dont know if this is wanted or a bug, or depends on my config.
I did only the update and have no 3rd party codecs installed.

This does not work, and it worked before the 10.6.3 update:
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Import MPEG2 Muxed from external hard drive

Hi there,
I am interested in the trick for iMovie 08.. I've updated from iMovie 05 HD and ready to import existing MPEG's from an external hard drive.
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Thanks
Deb

With a USB flash memory drive, or an external hard drive, create on it a folder named MP_ROOT, inside it create a folder named 101PNV01, now put your mpg-2 files in this folder. Have iMovie open; after creating these files and putting the mpeg2's on it, disconnect the drive from your computer, now, when you re-connect, is like connecting a camera, and with iMovie open already, it will tell you that you have connected a camera etc, etc, now import into iMovie 08.
I use this to import mpeg 2's.
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http://discussions.apple.com/message.jspa?messageID=5823783#5823783
Check out this thread, it explains this and other possibilities.

Converting a byte[] back to key problem

I CAN create a key and convert the key to a byte array, then convert the array to a string(base 64):
KeyGenerator generator = KeyGenerator.getInstance("DES");
generator.init(new SecureRandom());
key = generator.generateKey();
byte[] keyBytes = key.getEncoded;
BASE64Encoder encoder = new BASE64Encoder();
String randomKey = encoder.encode(keyBytes);
and I CAN save that string to a database, forget about it, then sometime later reload it and convert it to a byte array again:
String loadedKey = "WhAt3Ver-It-I5" //from DB
BASE64Decoder decoder = new BASE64Decoder();
byte[] loadedKeyBytes = decoder.decodeBuffer(loadedKey);
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Does anyone know.
I know I need to convert it to a KeySpec, I presume as:
DESKeySpec keySpec = new DESKeySpec(loadedKeyBytes);
this compiles correctly.... but how do i then recreate the key so i can use it for decryption.
Once i've finished this test program I should be able to port it to my application.
Many thanks in advance guys!
Cheers!
Relisys
================ CODE FOLLOWS ======================
import java.io.*;
import java.security.*;
import java.security.spec.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import com.sun.crypto.provider.SunJCE;
import sun.misc.*;
public class SecPrescrip {
public static void main(String[] args) throws Exception {
// Create Key.
Key key;
KeyGenerator generator = KeyGenerator.getInstance("DES");
generator.init(new SecureRandom());
key = generator.generateKey();
// Get a cipher object
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
// Encrypt the input string:
cipher.init(Cipher.ENCRYPT_MODE, key);
String input = "Medicare Secure Prescription: 30 Tamazopan 200mg tablets. Dosage: 1 to be taken every 4 hours";
System.out.println("Stage 1: ENCRYPT PRESCRIPTION WITH A RANDOM DES KEY");
System.out.println("===================================================");
System.out.println(" - Input Plain Text: "+input);
System.out.println("");
byte[] stringBytes = input.getBytes("UTF8");
byte[] raw = cipher.doFinal(stringBytes);
BASE64Encoder encoder = new BASE64Encoder();
String ciphertext1 = encoder.encode(raw);
System.out.println(" - Cipher Text: "+ciphertext1);
System.out.println("");
byte[] keybytes = key.getEncoded();
String randomkey = encoder.encode(keybytes);
System.out.println(" - Random Prescription Key: "+randomkey);
System.out.println("");
System.out.println("ENCRYPTION SUCESSFULL");
System.out.println("");
System.out.println("");
System.out.println("Stage 2: ENCRYPT RANDOM KEY WITH PATIENT MEDICARE KEY");
System.out.println("=====================================================");
BASE64Decoder decoder = new BASE64Decoder();
String passphrase = "ABCD1234efghIJ56"; //Patient Medicare Key
System.out.println(" - Patient Medicare Key: "+passphrase);
System.out.println("");
System.out.println(" - Input Plain Text: "+randomkey);
String algorithm = "PBEWithMD5AndDES";
byte[] salt = new byte[8];
int iteration = 20;
KeySpec ks = new PBEKeySpec(passphrase.toCharArray());
SecretKeyFactory skf = SecretKeyFactory.getInstance(algorithm);
SecretKey key2 = skf.generateSecret(ks);
byte[] input2 = decoder.decodeBuffer(randomkey);
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(passphrase.getBytes());
md.update(input2);
byte[] digest = md.digest();
System.arraycopy(digest, 0, salt, 0, 8);
AlgorithmParameterSpec aps = new PBEParameterSpec(salt, iteration);
cipher = Cipher.getInstance(algorithm);
cipher.init(Cipher.ENCRYPT_MODE, key2, aps);
byte[] outputFinalKey = cipher.doFinal(input2);
String ciphertext2 = encoder.encode(outputFinalKey);
String saltString = encoder.encode(salt);
String encryptedCiphertext = saltString+ciphertext2;
System.out.println("");
System.out.println(" - Cipher Text (Final Prescription Key): "+ciphertext2);
System.out.println("");
System.out.println(" - Salt: "+saltString);
System.out.println("");
System.out.println(" - Full Encrypted Output: "+encryptedCiphertext);
System.out.println("");
System.out.println("ENCRYPTION SUCESSFULL");
System.out.println("");
System.out.println("");
System.out.println("Stage 3: DECRYPT PRESCRIPTION KEY USING PATIENT MEDICARE KEY");
System.out.println("============================================================");
//NOT CHANGED String passphrase = "ABCD1234efghIJ56";
System.out.println(" - Patient Medicare Key: "+passphrase);
System.out.println("");
System.out.println(" - Input Plain Text: "+ciphertext2);
algorithm = "PBEWithMD5AndDES";
salt = new byte[8];
iteration = 20;
ks = new PBEKeySpec(passphrase.toCharArray());
skf = SecretKeyFactory.getInstance(algorithm);
SecretKey key3 = skf.generateSecret(ks);
//Load in the input bytes as if they had been loaded from an sql database or the like
String saltIn = encryptedCiphertext.substring(0,12);
String ciphertext3 = encryptedCiphertext.substring(12,encryptedCiphertext.length());
byte[] saltArray = decoder.decodeBuffer(saltIn);
byte[] ciphertextarray = decoder.decodeBuffer(ciphertext3);
aps = new PBEParameterSpec(saltArray, iteration);
cipher = Cipher.getInstance(algorithm);
cipher.init(Cipher.DECRYPT_MODE, key3, aps);
byte[] outputKey2 = cipher.doFinal(ciphertextarray);
String plaintext2 = encoder.encode(outputKey2);
System.out.println(" - Plain Text (Random Generated Key): "+plaintext2);
System.out.println("");
System.out.println("");
System.out.println("ENCRYPTION SUCESSFULL");
System.out.println("");
System.out.println("");
System.out.println("Stage 4: DECRYPT PRESCRIPTION KEY USING PATIENT MEDICARE KEY");
System.out.println("============================================================");
// The decrypter string plaintext should be the same as the BASE64 Encoded representation of the random DES string
byte[] randomKeyFetched = decoder.decodeBuffer(plaintext2);
generator = KeyGenerator.getInstance("DES");
DESKeySpec keyspec = new DESKeySpec(randomKeyFetched);
* Stuck here! Once the key is reformed it will be complete!
}

You need to use a SecretKeyFactory to convert the byte array back to a SecretKey to use in decryption. Continuing your example:
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
DESKeySpec desKeySpec = new DESKeySpec(loadedKeyBytes);
SecretKey sk = skf.generateSecret(desKeySpec);
Use sk in the call to the Cipher init() function. (Note that you don't call KeyGenerator to restore a key from its bytes.)
Incidently, if you're using ECB mode for encryption I don't think you need to worry about the Initialization Vector. However, if you're using CBC mode (which is the default DES mode for the default SunJCE provider), I believe you also have to make sure that the decryption system starts from the same Initialization Vector that was used for encryption. To deal with this, if 'cipher' is your encryption Cipher object, then you call
byte bytIV[] = cipher.getIV();
to get the 8-byte IV array. To decrypt, you need to call:
IvParameterSpec iv = new IvParameterSpec(bytIV);
This is an AlgorithmParameterSpec, and can be used as the third argument to the init() function for Cipher to set up decryption, e.g.
Cipher cd = Cipher.getInstance("DES/ECB/PKCS5Padding");
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when you create the Cipher objects).
To simplify things a bit, you might just want to use a fixed 8-byte Initialization Vector by constructing a IvParameterSpec and using it for all DES encryption and decryption.
The documentation on all of this is extraodinarily obscure.

Converting PDF file back to word need assistance please, have adobe reader 11.0.10

Need assistance converting PDF documents back to Word format, have adobe Reader 11.0.10 will this work and directions please

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Converting MPEG1 Muxed" or "MPEG2 Muxed

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Have a look into iSquint. It might be just what you're looking for.

Does iMovie automatically convert mpeg2 files that are opened in iMovie?

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http://www.squared5.com/svideo/mpeg-streamclip-mac.html
which is free, but you must also have the Apple mpeg2 plugin :
http://www.apple.com/quicktime/mpeg2/
(unless you are running Lion in which case see below))
which is a mere $20.
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And from the TOU of these forums:
Keep within the Law
No material may be submitted that is intended to promote or commit an illegal act.
Do not submit software or descriptions of processes that break or otherwise ‘work around’ digital rights management software or hardware. This includes conversations about ‘ripping’ DVDs or working around FairPlay software used on the iTunes Store.
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For backup see this user tip.
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tt2

Trying to convert a int back to a textfield - help

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Converting MPEG2 Muxed back to Dv

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