Frage von Chris555:
Day,
meaning because the so-called
I-frame or I-frame rate, which in many Kompremierungsprog's can be?
How to set this value because s.Besten Ein?
Did this not much info on the net can find.
Gruß,
Chris
Antwort von WoWu:
Hi Chris
I-frames are part of a group of pictures (GoP) in MPEG-based compression method and include the only part of the GoP a complete Picture.
B and P are in the GoP no image synonymous if they are sometimes referred to as such-but only the difference information between the I-frames. In the MPEG 2 method, which underlies HDV does HDV1 a Bilstruktur of 6 frames / GoP and at HDV2 of 15 frames / GoP - (each GoP has 1 I-frame). When there are so HDV1 rd. 4 real frames / sec and at HDV2 approx. 1.6 Real images / sec.
Usually you adjust structure s.dieser nothing, unless you want to create your own structure, which only in very few cases actually makes sense.
Detailed info: see below
Antwort von tommyb:
The question is always, what codec?
MPEG2 => see WoWu (no change)
MPEG4 => 10x the frame rate (25fps = 250 frames I-frame interval)
Antwort von TheBubble:
meaning because the so-called I-frame or I-frame rate, which in many Kompremierungsprog's can be?
I-frame is intra-frame. This refers to frames (frames) dekompriemeirt alone can be, ie they take on no other data reference frames. The first frame of a film is therefore usually an I-frame.
The different frame types (P for Predicted and B for bi-directional), take on other reference frames and can therefore not be individually decompressed.
I-frames are synonymous in between (ie not just a movie s.Anfang) inserted because they are not without problems "in the middle of the film" with the Decompression can be started.
How to set this value because s.Besten Ein?
Did this not much info on the net can find.
It depends of several things. Specifications for the parameters you should observe.
Otherwise: With little movement, that is very similar consecutive frames are rather large distances between I-frames advantageous because it increases the Kompressionseffiziens. For much movement or change in the film, however, the benefit is lost.
For hard cuts with scene change, it offers to s.diesen Make an I-frame insert.
Frequently inserted I-frames have the advantage that with the Dekompresion s.möglichst many varieties can be started. DV - Video is just as I-frames, therefore it can s.jeder anywhere, without any parts of the film re-compress to have to cut and with the start playback anywhere.
Antwort von Chris555:
45 min. DV footage to produce a mpv or mpeg2 file at 15 frames and I-9800 kbits / s.
Thanks for your answers!
Antwort von WoWu:
@ Tommyb
Such information as synonymous in VirtualDub:
MPEG4 => 10x the frame rate (25fps = 250 frames I-frame interval) are very confusing and it should not be synonymous
frames Hot 250, but only 250 and refers to the time interval in ms. 25/30-1000 ms are common.
The fact is that in MPEG 4 more I-frames (as the one in MPEG2)-up to 16 - allowing synonymous and outside the actual GoP. The reference images can be synonymous in another lie and GoP as a Long-term reference pictures in memory of.
In addition there is the switching slices, cut the synonymous (transition) allow the non s.einem I-frame is located.
Nor can B-frames in MPEG 4 to some extent be used as a reference and thus have a far-reaching significance than MPEG2.
In this respect, MPEG 4 (I-frame) is not so simply explained as MPEG2.
Tommy, that's why I presented it to me ...
Frequently inserted I-frames have the advantage that with the Dekompresion s.möglichst many varieties can be started. Beware, irregularities in the GoP structure must be transmitted to the decoder ... this is not possible in all cases!
Therefore, decoder can arbitrariness in such an easy time swallow!
Antwort von tommyb:
@ WoWu
I know that even synonymous, but the thread creator did not synonymous mention what codec he says. Moreover, he only inquired, "what values you eisntellt" and not like a codec on the inside works.
Antwort von Chris555:
So Avid from a. Mov-Reference and Sorenson in one. Mov
(DV for short-shoot for the Internet's deinterlacer if necessary) using Soenenso Video 3 Pro codec, since the Avid DV codec does not work. Continue to create the mp4 with QT
(no deinterlacing possible) with the H.264 codec.
Gruß,
Chris
