Otherwise, x has a slight quality edge over MainConcept , though the difference may not be noticeable at the encoding parameters used by most streaming producers. At a high level, there is some uniformity in the compression parameters available for each codec. For example, all H. To explain, there are multiple encoding techniques and algorithms available in H.
Profiles specify which of those techniques and algorithms can be used to create a bitstream, and constitute a convenient meeting point for device manufacturers and video producers. Quality is still good, but not as high as streams produced using the Main or High Profiles that incorporate both techniques.
The iPod documentation specified that these devices could only play H. This means a maximum video resolution of x 30 frames per second at a maximum data rate of 14Mbps. Wikipedia has a chart that details the specifics of each H.
In contrast, when producing for computers, the players enabling H. Though the Flash Player can technically play p video encoded at 15Mbps on a low-power netbook, few connections could deliver that data rate in real time, the costs of delivery would be prohibitive, and the frame rate produced by that low power CPU would probably not be pleasing to viewers.
For example, Figure 1 is the H. As you can see, you can choose Profile and Level, but no other H. Figure 1. Adobe Media Encoder's simple H.
At the other end of the complexity spectrum is Figure 2 , which shows two of the four screens of encoding options available with the xEncoder , an xbased QuickTime encoder. Figure 2. Some of the encoding options available using the xEncoder. Overall, though H. A number of companies claim patent rights for intellectual property contributed to the development of H. Under the patent pool, different royalties apply to the different classes of products, as shown in Figure 3.
Figure 3. The H. On the left are products sold or otherwise distributed with AVC encoders or decoders installed, while on the right are various content categories that include video encoded into H. For content categories on the right, there are royalties for subscription services, that scale with the number of subscribers, but only start after exceeding , subscribers. There are also charges for Title-by-Title content sold to viewers pay-per-view , but only for content longer than 12 minutes in duration.
There's a setting somewhere i'm missing i know it!! Sep 26, PM in response to pherplexed In response to pherplexed The last version i rendered was x px using Since you think Apple's FCS demo looks so good why don't you try re-encoding a sample of that to see if the quality is maintained. Also, I'm sure Apple's demo was in a progressive format, you haven't said whether your source was interlaced or progressive and I think some of Apple's presets include deinterlacing which you may or may not want to do check under the frame control and filter settings.
I have seen a few reports that QuickTime 7 may have some issues with RGB color space conversions but I don't see how that could be part of your problem since neither DV nor H. However, if you converted from RGB at any step in your workflow then perhaps that is part of the problem. I don't know any of the details concerning these reports, it may or may not be appropriate to your situation.
Sep 27, PM in response to Waymen In response to Waymen I think you're right about apple's clip being done in a progressive format. User profile for user: Joe Rice Joe Rice. Oct 11, PM in response to pherplexed In response to pherplexed One red flag that jumps out at me is the conversion to DV.
Do you have the space to use a higher quality intermediate codec? Converting to DV is going to resample color at , lowering chroma resolution, and causing jaggies especially in areas with high red or blue content. Furthermore, in the sequence settings for the sequence where the downscaling from HD to SD is occurring, go to the Video Processing tab and set the Motion Filtering quality to best.
That may improve the HD to SD conversion. I had a feeling that downconverting to dv was part of the culprit. I'll try the sequence and encoding settings you suggested and see what we get. Oct 11, PM in response to pherplexed In response to pherplexed No problem - hope it helps.
In DV, where you've got a lot of blue or red information, this can show up jagged or blocky. Why is grading h. I'm writing a journal for my filmmaking course about colour grading. I've been told that h. I think I can wrap my head around the part about it being unstable being inter-frame I guess but is the second part true? Just to point out I have no plans to use h.
Dipo Ogunmodede , Oct 14, That and h is more compressed so will contain less colour information. To me, h is a deliverable format, not a production one. Michael Christophersson , Oct 14, Val Andreev and Marc Wielage like this. Quite often videos get crushed a little more in the blacks to get rid of a lot of detail that may not be seen. This is why such compressions are called "lossy", they literally throw away image data to keep the file size down.
How this data is manipulated depends on the compression algorithm, some will block similar colours together. Cartoons compress very well. Dipo Ogunmodede likes this. Marc Wielage , Oct 14, Tristan Summers , Oct 15, Marc Wielage , Oct 15, These parameters are not ideal, but not the end of the world either.
We've been working with D1 and Digital Betacam tape formats without picture falling apart for many years. Note that Digital Betacam can record 10 bits, but this simple menu option often went unused, but that's a whole another story.
0コメント