On Wednesday 29 March 2006 19:39, Kyrre Ness Sjobak wrote:
>
> [QUOTE fw-encoder-api.txt]
> Name IVTV_API_ASSIGN_STREAM_TYPE
> Enum 185/0xB9
> Description
> Assign stream type
> Param[0]
> 0=Program stream
> 1=Transport stream
> 2=MPEG1 stream
> 3=PES A/V stream
> 5=PES Video stream
> 7=PES Audio stream
> 10=DVD stream
> 11=VCD stream
> 12=SVCD stream
> 13=DVD_S1 stream
> 14=DVD_S2 stream
> [/QUOTE]
>
> Yes, the wiki also tels me that. But what is the difference between a
> "DVD stream", a "DVD_S1" stream, a "Transport stream" or a "Program
> stream"? Is it a quality setting (some "preset"), something todo with
> how things are encoded, or what is it?
It's packaging basically. All stream types are defined by the MPEG
standard. Now I recently discovered that the Transport Stream is
broken, so that's useless. I think the best streams to use are either
PS or DVD_S2. (The DVD_S1/S2 were later additions by Conexant and are
apparently more stable or more DVD standard conforming.)
Personally I always use PS. I have no experience with MPEG1 and VCD/SVCD
streams. Anyway, read up on MPEG and you'll come across all these
terms. The documentation is not written as a MPEG tutorial, although it
could use some links to other sites that do provide that info.
>
> Say i want to create a stack of DVD's from my home videotapes. Should
> i just set streamtype to "DVD" and that that will get me the correct
> everything, including a fitting "Gigabyte per hour"? As with the
> standard setting, it uses something like 6 or 7 gigabytes to get just
> under 2 hours of captured data - while proffesional DVD's can manage
> 3 hours or so (ok, they have more room than the 4.7 GB offered by
> dvd-burners, but...)
Use the ivtvctl -c bitrate=XXX option to define the quality of your
recordings. And I would experiment with either PS or DVD_S2 to see what
gives the best results. Personally I burn about 2 hours 15 minutes on a
4.7 DVD. These are my (PAL) settings:
ivtvctl --set-format=width=720,height=576
--set-codec-params=stream_type=10,bitrate=4500000,bitrate_peak=6000000
I use DVDShrink to shrink the final DVD image down to 4.7 GB.
This is sufficient for me and for TV recordings. But you really need to
experiment what works best for you and for the SW tools you are using.
Hans
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