The data rate is much less of an issue here than the CPU overhead in decoding and displaying the AVCHD as you edit. AMA link, subclip selects and transcode to an Avid codec. A much better experience.
On 2 Feb 2013, at 05:45, Mark Spano wrote:
> Yeah, AVCHD is not good at all for editing. If they want you to work to
> that, it's not gonna be fun.
>
> AVCHD = long GOP interframe compression
> AVC-Intra = intraframe compression, all I-frames, no GOP
>
> You're on the right track with DNxHD 45.
>
>
> On Fri, Feb 1, 2013 at 11:38 PM, Dom Q. Silverio domqsilverio@gmail.com>wrote:
>
>> **
>>
>>
>> AVCHD is up to 28 Mb/s. It varies depending on implementation, but the
>> upper limit is 28 Mb/s.
>> DNX45 is a bit more predictable at 45 Mb/s. It is at least 61% higher.
>>
>>
>> On 2/1/2013 11:24 PM, Steve Hullfish wrote:
>>> As for 720P, I wanted to go 1080 because I didn't think you could get
>> down to DNxHD45 with 720p...
>>>
>>> I still haven't figured out the various DNxHD formats that are available
>> depending on the specifics of the format, for example, if you go RGB
>> instead of YCbCr you are stuck with DNxHD220 4:4:4...
>>>
>>> I just want a decent looking, easy to edit, relatively small codec to
>> suggest. I am pretty sure that this station IS a 720p station,
>> broadcast-wise... I'll ask what their servers save stuff as.
>>>
>>> Anybody know the size difference between AVCHD and DNxHD45... I'll look
>> on the Avid website to see if I can find it...
>>>
>>> Steve Hullfish
>>> contributor: www.provideocoalition.com
>>> author: "The Art and Technique of Digital Color Correction"
>>>
>>> On Feb 1, 2013, at 10:09 PM, Dave Spraker avid@spraker.tv> wrote:
>>>
>>>> That's whacked. 720p may be appropriate depending on their network
>>>> affiliation, but AVCHD is a pain to convert to and from.
>>>>
>>>> Dave Spraker
>>>>
>>>>
>>>> Western Rep | EditShare | Maxx Digital | Consulting | Sports Audio
>>>>
>>>> dave@spraker.tv dave@spraker.tv>
>>>> (503) 897-0250
>>>>
>>>> www.westernrep.com
>>>>
>>>> www.editshare.com http://www.editshare.com/>
>>>>
>>>> www.maxxdigital.com http://www.maxxdigital.com/>
>>>>
>>>> www.spraker.tv http://www.spraker.tv/https://www.vizify.com/es/50a32f618e76660002000521> See my vizify bio!
>>>>
>>>> From: Avid-L2@yahoogroups.com [mailto:Avid-L2@yahoogroups.com] On
>> Behalf Of
>>>> Steve Hullfish
>>>> Sent: Friday, February 01, 2013 7:38 PM
>>>> To: Avid-L2@yahoogroups.com
>>>> Subject: Re: [Avid-L2] Isis Media Composer using AVXIntra as editing
>> codec?
>>>>
>>>> Marc, You are correct. I'm mistaken. It's AVCHD. That's cool? These are
>> MC
>>>> 6.5 systems running on a mirrored Isis 7000 of considerable size.
>>>>
>>>> Their consultant told them to use AVDHC at 720p. I would prefer DNxHD at
>>>> 1080.
>>>>
>>>> This is for a TV station in a major market. The news stuff is P2. The
>> rest
>>>> is all off of network servers, coming in as some flavor of MPEG2 HD.
>>>>
>>>> I was feeling like the system (which is brand-spanking new) was
>> sluggish.
>>>>
>>>> If it's fine to edit with and it saves space, I'm all for it.
>> Personally I'd
>>>> prefer DNxHD and 1080, but that's just personal and I don't know that it
>>>> would really look any better, but I feel like at DNxHD 45 it wouldn't
>> save
>>>> that much space over AVCHD and MIGHT provide better performance.
>>>>
>>>> Steve Hullfish
>>>> contributor: www.provideocoalition.com http://www.provideocoalition.com
>>>
>>>> author: "The Art and Technique of Digital Color Correction"
>>>>
>>>> On Jan 31, 2013, at 11:23 PM, Mark Spano cutandcover@gmail.com
>>>>> wrote:
>>>>> Steve,
>>>>>
>>>>> Are you maybe confusing AVC-Intra with AVCHD? AVC-Intra (in MC) is a
>>>>> 100Mbit/sec high quality intraframe codec suitable for editing,
>> mastering,
>>>>> shooting, etc.. (http://en.wikipedia.org/wiki/AVC-Intra)
>>>>>
>>>>> AVCHD (http://en.wikipedia.org/wiki/AVCHD) is an extremely efficient
>> lossy
>>>>> codec only suitable for shooting (sometimes) and highly compressed
>>>>> delivery. And yes, you do want to get away from it quickly when
>> bringing
>>>> it
>>>>> in for editing.
>>>>>
>>>>> AVC-Intra works well but I would say is sluggish compared to DNxHD
>> (unless
>>>>> you have the Nitris DX AVC-I chip, as Dave mentioned). However, it's
>> not a
>>>>> space saver or a lower quality codec.
>>>>>
>>>>>
>>>>> On Thu, Jan 31, 2013 at 10:55 PM, Steve Hullfish
>>>>> steve4lists@veralith.com >wrote:
>>>>>
>>>>>> **
>>>>>>
>>>>>>
>>>>>> I'm freelancing for a place that has an Isis and Media Composer 6.5s
>>>>>>
>>>>>> When they were walking me through their standard procedures, the first
>>>> one
>>>>>> was to set the Media Creation settings to capture at AVCIntra... My
>>>>>> previous dealings with AVCIntra as an editing format SUCKED. I thought
>>>> the
>>>>>> goal was to get AWAY from Intra as quickly as possible. They're
>> actually
>>>>>> intentionally taking media INTO AVCIntra on Avid. Is there any
>> benefit to
>>>>>> this? I doubt it saves that much space/bandwidth compared to DNxHD
>> 45...
>>>>>>
>>>>>> There are multiple stations using AVCIntra as an editing media format.
>>>>>> Does anyone think there's any good reason for that? I'm not being
>>>> sarcastic
>>>>>> or rhetorical. I want to know. I want to convince them to switch to
>> 45,
>>>> but
>>>>>> that will be going against the advice of the "expert" that set this
>> up.
>>>>>>
>>>>>> Steve
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>> [Non-text portions of this message have been removed]
>>>>>
>>>>>
>>>>>
>>>>> ------------------------------------
>>>>>
>>>>> Search the official Complete Avid-L archives at:
>>>> http://archives.bengrosser.com/avid/
>>>>> Yahoo! Groups Links
>>>>>
>>>>>
>>>>>
>>>>>
>>>> [Non-text portions of this message have been removed]
>>>>
>>>>
>>>
>>>
>>> [Non-text portions of this message have been removed]
>>>
>>>
>>>
>>> ------------------------------------
>>>
>>> Search the official Complete Avid-L archives at:
>> http://archives.bengrosser.com/avid/
>>> Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>
>>
>>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Search the official Complete Avid-L archives at: http://archives.bengrosser.com/avid/
> Yahoo! Groups Links
>
>
>
With best wishes,
Roger Shufflebottom
+44 7973 543 660
[Non-text portions of this message have been removed]
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