Constant Bit Rate CBR for HD

Why is there no option for HD MPEG-2 streams with a constant bit rate (CBR)? This is standard across broadcast formats, so why no option? And why no answers to this question? It's been asked for some time here.

Why is there no option for HD MPEG-2 streams with a constant bit rate (CBR)? This is standard across broadcast formats, so why no option? And why no answers to this question? It's been asked for some time here.

Similar Messages

  • How to encode 50 MB constant bit rate I Frame only MPEG-2 Program Stream

    I want to do a test upload to a digital programme delivery service. I'll be encoding a short clip for FTP upload.
    The specs the company sent says material should be encoded as follows:
    "50 MB constant bit rate I Frame only MPEG-2 Program Stream direct from digital source."
    Can anyone translate this into Compressor settings?
    Material also must have timecode.
    Thanks

    50MB constant bitrate? I hope you meant 50 Mbps... hehe. Hmmm... 29 Mbps seems to be max, using Compressor.
    To get a constant bit rate (CBR), choose One Pass CBR under the Quality tab in the Inspector.
    I am not sure if Compressor can do I-Frame only, but it can give you an IP GOP structure. Setting the GOP Structure to IP, and the GOP Size to the lowest possible gives you the best possible quality, but also the largest file size.
    For audio, choose AIFF, and make sure it gets the same name as the .m2v, but of course with the right .aif suffix.
    To make an MPEG-2 Program Stream, you need to use MPEG Streamclip (freeware).
    Open the .m2v file in MPEG Streamclip (the audio should automaticly load with the video file if they have the same file name). Choose the file menu and choose Covnvert To MPEG Using MP2 Audio.

  • Constant Bit Rate H264

    Hi all.
    Im converting a movie for real time streaming, but i have a problem because the data rate change. I want to keep the same bit rate in the movie for streaming, but i have not seen the Constant Bit Rate CBR option in my Quick Time Pro 7.02.
    How can i do it?

    Here are screenshots.  I tried a couple of tests and seems that the bit rate it resets to is random.  For instance, I just set the bit rate to 35 and clicked OK.  Then I went back into the settings and set it to 25 and clicked OK.  Then I started the compression and it had reset itself back to 35.  Then I deleted the source file, re-imported it, used the same blu-ray preset, and changed it to CBR 23mb/s, but when I started the encode it had jumped to 25.  I stopped it, went into the settings, changed it to 18 and clicked OK.  Then I went back into the settings and it was back at 25.  Here are some screenshots of what's going on, taken within a couple seconds of each other.

  • Export to .m2t constant bit rate

    I need to export out of FCP a film as an mpeg transport stream, file prefix .m2t i'm currently using compressor 3.0.5 but it will only give me variable bit rate for out put which is no good. Can anyone tell me if compressor 3.5 corrects this problem or if there is a third party piece of software that I could use ? I looked at lumiere hd but i'm not sure if they are still in business.
    export setting are as follows.
    1920 x 1080 progressive, at a constant bit rate of 15 or 20 mbps per sec.
    Thanks in advance.

    Thanks Wally, it may come to that. Today I bought the up grade hoping that this would solve the problem but no just the same if I want to compress a HD file, into a .m2t file it still greys out the CBR option. A friend who has a similar system and was working in FCP 6.0.3 was able to produce them but said it was a bit involved, gave me a copy of one of his saved settings. I opened it in compressor and in the inspector summary it read as you would hope. However when I clicked on the inspector tabs, it defaulted to VBR. ***! Don't really know what to think. What could be effecting the changing of settings in compressor in such a way. I checked the preferences but there was nothing there that stood out as being relevant .... I thought about doing a total clean install but it seems rather extreme and without guarantee of sorting it.

  • Constant bit rate MPEG2?

    Hi,
    I've been asked to supply a file in 1920x1080 MPEG2 constant bit rate format, but I can't seem to select CBR as an option if it's 1920x1080 MPEG2... does anyone have a solution?
    Paul

    Again, I can't quite figure it out. Here's what's happening on my screen:
    I select Apple ProRes 422 as the target (and check that the output frame rate and size are the same 25fps, progressive, 1920x1080 as the source)
    I go to the inspector window, and change file format to MPEG2, select Generic for stream usage, HD 1920x1080 for the video format... and can only One or Two Pass VBR. (Same result with HD DVD or BluRay as the stream usage settings; I can select CBR for non-HD formats.)
    What am I missing?

  • ITunes & Constant Bit Rate

    Hi. Okay this is my first time posting here. Up till now I've been decently satisfied with my iPhone. However right now I'm trying to import some songs from a CD that I own onto my computer and into my iTunes Library.
    Okay so I watched the tutorial video. I did a little research online and I found the way to change the import settings.
    I want a HIGH QUALITY music file in the .aac format at a CONSTANT BIT RATE.
    Following me so far? With that in mind when it came to the 1st screen I selected "Custom" and I choose
    Stereo Bit Rate: 320
    Sample Rate: 44.100 kHz
    Channels: Auto
    Within this window the option "Use Variable Bit Rate" was SELECTED.
    I unchecked/deselected it because I want a CBR (Constant Bit Rate).
    And then I hit "Okay" thinking that I had done everything correct and perfectly.
    Then I was back at the Main Pain. I hit Import CD hoping it would use the custom settings. However when I went to the folder to my shock and surprise it was giving me music files with a varying bit rate.
    Some files were 325. Others were 321 and a few 319. This is NOT what I wanted and not what I expected from iTunes. I tell it to not use VBR it should be doing CBR right?
    So that's why I'm hear. What do I need to do to get this to WORK the way I want it to? Or should I just give up and use another program like Windows Media Player to rip my songs into .mp3? I'd rather use .aac since I hear it's better quality and it's the evolution of mp3.
    Any help would be greatly appreciated....
    Message was edited by: TheLionOfAzzalle

    It's still NOT working.
    I've done exactly the way you suggested. I've also tried it with "use error correction" and it still doesn't give me what I want.
    The only thing that sorta produces what I want is when I put it to mono and start the importing process the files all come out at the same bitrate.
    However the highest bitrate I can get with that is 160. And that's not what I want.
    I'm about to just give up. On top of iTunes being ridiculous slow on all Windows computers I now find that importing songs is a complete hassle.

  • Bit rate standards for Compressing video for Captivate

    I have been trying to decide whether rto use constant bit rate or a variable bit rate when compressing my video to embed in Captivate.
    I have been told by Connect support that a constant bit rate is better for deploying video in Presenter but I am wondering if anyone has information as whether that is also true for Captivate. We are using captive as a means to offer a series of video question and answer sequence for a client of ours, and I  am interested in  getting the best quality with the smoothest performance in a progressive download flv format
    For a simple talking head I am tempted to use a variable bit rate but, I cannot find anything in the seaces I have made that talk about the spec or any pros an cons to that quetsion for Captivate.
    Doee anyone have any expereince with that?

    I have always used constant bitrate for videos imported into Captivate and that has worked fine. However, I never tried using variable bit rate so I don't know if it will work better or worse.
    My guess is that it would be better to go with constant bitrate though because Captivate do have some funny issues with FLV's sometimes and it's probably better not to "stress" captivate ;o)
    /Michael
    Visit my Captivate blog with tips & tricks, tutorials and Widgets.

  • Trying to make MPEG2 HD 422 Transport stream at constant bit rate

    I am trying to make a Compressor Preset to make MPEG2 HD 422 Transport stream 1920x1080i with a Constant Bit Rate of 15 Mbps and Open GOP structure . but  when I select MPEG transport stream I can't make it a Constant Bit Rate and the GOP structure is set to Closed and "Grayed Out"
    I am making files for our Playout Server and this is the specs requested by the manufacturer.
    Is there a way to make this setting or do I just need to go to Adobe Media Encoder?

    K47MU-D wrote:
    Is there a way to make this setting or do I just need to go to Adobe Media Encoder?
    Media Encoder is a very good choice for what you need to do.
    Other than bit rate, Compressor offers very little in the way of adjustments to their presets for program streams and transport stream.
    Good luck.
    Russ

  • 50 MB constant bit rate I Frame only MPEG-2 Program

    '50 MB constant bit rate I Frame only MPEG-2 Program'
    What does that all mean, and how do I go about to find all these settings?
    It's for a commercial.
    Niel

    You're going to have a much easier time doing this in Compressor 3 than in 2, but what I'm assuming you're talking about here is a Program stream (multiplexed file) very similar to a transport stream.
    These MPEG-2 encoded files are used for broadcast and have both the audio and video contained in one file as opposed to DVD which requires those assets separated into elementary streams.
    If you're using Compressor 2, create a custom MPEG-2 setting and in the extras tab of the Encoder Pane select the Multiplexed option. Note though, that you will only be able to take the bit rate up to 20Mbps and it will only create a transport stream.
    In Compressor 3 you can choose between Program and Transport streams and you can increase the bit rate up to 40Mbps.
    BG

  • What are the best data and bit rate setting for uploading from final cut express to Youtube?

    Can anyone suggest the best data rate and bit rate presets for uploading footage from final cut express 4 to Youtube? What settings will provide the best resolution, quality, and match the current youtube requirements?
    Thank you in advance for your help,
    Susan Kayne

    It depends on whether you are using aspect ratios of 4:3 or 16:9.
    Below is some simple guidance that will provide good quality with reasonably small file sizes.
    The first part is for 4:3 video:-
    1. File>Export Using QT Conversion.
    2. The "Format" window should say, "QT Movie".
    3. In "Use" select "LAN/Intranet" from the dropdown menu.
    4. Click "Save" and when it has finished encoding, upload it to YouTube.
    If you are making 16:9 video (Standard or High Definition) do steps 1 to 3 above.
    Then when you have selected "LAN/Intranet" press the "Options" button and in the new
    window that opens press the  "Size"  button and change the  "640x480" to  "853x480"
    To do this you will have to click on the  640x480 and a dropdown menu appears.
    Select "Custom" from  the bottom of the menu and in the window that opens
    you will see 2 boxes.
    Put  853  in the first box and  480  in the second.
    Click OK.
    Then Save it.

  • Constant Bit Rate or One Pass VBR?

    I'm about to burn a 90 minute DVD and I don't know if I should use CBR or One Pass. The footage is old and has lots of noise. My bit rate equation (560/x) comes out to about 6.2. If I use One Pass VBR can I go higher on the max than 6.2? I know I'll need a little room for audio. I'm going to use an
    A/C at 192. What do you think?
    John

    The footage is old and has lots of noise.
    Then it might need a higher bitrate. . . Even though the noise is ugly, at a low bitrate it would get even uglier.
    Noise has a lot of info , it's like (for lack of a better example) a shot of a tree with lots of leaves blowing around. Lots of information which needs a higher bitrate to do it justice.
    Just like David pointed out, do a test & see what is needed for your footage.
    Bill
    PowerMac G5 Dual 2GHz   Mac OS X (10.4.3)   DVD Studio Pro 4.02 + Windows XP

  • Bit Rate settings for compressing to iPhone

    Hello-
    I have Compressor 3.05 and I'd like to use a bit-rate setting that is not available in the Apple-provided iPhone presets. I'm looking for something around 150. Is there a way to create a custom preset for iPhone compatible video? I can't seem to figure this out.
    Thanks,
    Mark

    Yes there is!
    *Step 1:* Create a preset will all the other settings how you want them. In my case I started with File Format: H.264 for Apple Devices, Device: iPhone (Local/Wifi) Drag the data rate down as low as it will go (700Kbps). Save it as a new custom setting.
    *Step 2:* Those are stored in User>Library>Application Support>Compressor open the preset you just created (it will have the same name) in a text editor, I used TextWrangler. Find the second <data-rate> (the first one is for audio) the number in there should be 87500. Lower that number to the desired amount.
    *Step 3:* Save the file. Go back into Compressor and then apply it to your source video.
    That should do it!

  • Constant Bit Rate / ATSC HD Formats / NOT AVAILABLE?

    Compressor does not allow CBR as an available compression format for any HD formats- Only NTSC.
    This has been a bit of a frustration for us, as a number of HD playout hardware manufacturers require CBR files types for their compressed media.
    Does anyone know if Apple Pro Apps have any plans to support CBR for HD formats in the future...?
    Thanks;
    Benjamin Lein

    good question... i've been trying to find out about creating a MPEG 422 CBR for XDCAM is it possible?

  • Custom bit rate of 192kbps coming out as all sorts

    Started importing some more CDs today and the bit rates for the imported files are showing anything between 187 and 195 kbps ?????
    The rest of my library shows as 192 kbps all 4000+ tracks.
    Anyone explain, as I have not got variable bit rate selected in preferences ( that was my first thought ).
    It also happens on converting too.
    Message was edited by: Airsculpture

    As far as I know, Apple's implementation of AAC never had a true "constant bit rate" (CBR) mode. AAC files encoded by iTunes have always varied slightly, even dropping the bit rate close to 0 kbps on portions of "digital silence." You can verify this by opening an old AAC file in Quicktime and selecting "get info" to view its actual average bit rate. Previously, iTunes simply displayed your target bit rate. I don't think there has been any actual change in how iTunes/Quicktime encode CBR, it is simply that it is being displayed differently.

  • Short Answer for Bit Rates...

    Greetings!
    I am doing a second version of my 90-minute 4:3 SD MPEG-2/Dolby2 DVD.
    This second version is only 50 minutes.
    Can someone please help me with maxamizing my Bit Rates for 50 minutes?
    I want as much video quality as recommended for newer home DVD players.
    From FCP 5.04 (with all render files trashed), I Export> Compressor:
    2 pass VBR
    Average BR: 6.9
    Max BR:8.1
    Quality: Best
    Should I go higher or lower?
    Sound:
    Dolby2: 224
    Should I go higher or lower?
    Any comment welcome.

    Thanks.
    I did the 50-minute MPEG2 at Constant Bit Rate (one pass), 7.0 and Best.
    It turned out as good as I ever got from iDVD which is okay.
    After hanumang's tip on the Compressor 2-pass VBR "BUG" --- I finally realized what was "wrong" with my 90-minute (2-pass VBR) DVD.
    In fact, pixelation looked so goofy I ate all the time and completely redid the 90-minute MPEG2 at CBR 7.0 & Best and it looked as good as the 50-minute DVD.
    +++
    Not to be too negative, but my experience with Apple's "professional" MPEG-2 VBR encoder is very disappointing -- the version I paid a lot of money for is clearly sub standard and would have been an embarrasment to send out.
    I read here that they have fixed it in a .1x (?), but that fire drill is more than a week away, no help now, (plus $50 that I mailed today).
    +++
    In any case, I've completed my 2-DVD project and would like to thank everyone who helped me.
    g_ballard

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