Changes between Version 5 and Version 6 of Postprocessing


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Timestamp:
Jan 19, 2015, 1:10:00 AM (3 years ago)
Author:
arwa
Comment:

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  • Postprocessing

    v5 v6  
    995. libpostproc 
    1010 
    11 These filters basically smooth away blocking and other artifacts from low quality sources. The further you increment the value of QP, the more intensely it smooths away detail. In particular, the quantization parameter QP regulates how much spatial detail is saved. When QP is very small, almost all that detail is retained. As QP is increased, some of that detail is aggregated so that the bit rate drops – but at the price of some increase in distortion and some loss of quality. So, if you want to lower bit rate, you can do so by lowering QP at a cost of increased distortion. 
     11These filters basically smooth away blocking and other artifacts from low quality sources.The parameter QP is chosen by the encoder used to create the video, VCD, DVD, etc. Lower QP for the encoder results in higher bitrate and higher quality encoding. If no "QP" parameter is specified by the user to the Postprocessing filter then it uses the one that is stored in the encoded file for the specific area. In particular, the quantization parameter QP regulates how much spatial detail is saved. When QP is very small, almost all that detail is retained. As QP is increased, some of that detail is aggregated so that the bit rate drops – but at the price of some increase in distortion and some loss of quality. 
    1212 
    1313USPP uses an encoder, hence, should be used only when one has a powerful CPU. Also, USPP is very slow as compared to other filters. Therefore, for processing large amount of data, FSPP is a good option (It gives good results if parameters are chosen wisely).