sageiop.blogg.se - Mainconcept mpeg encoder v1.5.1

Main Profile (MP): Originally intended as the mainstream consumer profile for broadcast and storage applications, the importance of this profile faded when the High profile (HiP) was developed for those applications.

Baseline Profile (BP): Primarily for lower-cost applications with limited computing resources, this profile is used widely in videoconferencing and mobile applications.

The H.264 standard includes the following seven sets of capabilities, which are referred to as profiles, targeting specific classes of applications: VBR commonly cause better visual quality marks than CBR for the same average PSNR values for sequences. Such methods also require more compression time. So-called true motion search commonly will not reach minimum sum of absolute differences (SAD) values in codec ME, but may result in better visual quality.

Motion estimation (ME) search strategy can also cause different visual quality for the same PSNR.All filters increase compression/decompression time, so they enhance visual quality but decrease the speed of coding and decoding. Postfilters show similar characteristics - deblocking and deringing maintain PSNR, but increase quality graining (suggested in H.264) essentially increases video quality, especially on big plasma screens, but decreases PSNR. Deshaking greatly decreases PSNR, but increases visual quality. Denoising and deflicking normally maintain PSNR value while increasing visual quality (the best slow denoising filters also increase PSNR on medium and high bitrates). Codecs often use prefilters such as video denoising, deflicking, deshaking, etc. Pre- and postfilters are widely used in codecs.

When codecs with similar objective results show results with different subjective results, the main reasons can be:

In the case of video codecs, this is a very common situation.