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Vision

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Posts posted by Vision

  1. On 3/27/2019 at 9:57 AM, amanieux said:

    what i don't get is that for such high priced camera as panasonic s1 why don't they offer uncompressed raw on usb 3.0 that has enough bandwidth for 4k raw in 14 bits, is it only to protect their more expensive pro video camera linup ? adding a hardware usb 3.0 path for uncompressed data out of the sensor is obviously not as expensive as putting a 10 bit h265 chip in camera plus the extra costs of upgraded thermal design and bigger battery to handle h265 compression+in camera fast sd-card write.

    You just asked and answered your own question 

  2. 1 hour ago, Rinad Amir said:

    This might sound like dumb question but is there any advantages shooting h265 in anamorphic ? 

    Apart from slowing down your pc (iuseproxy) 

    Improved intraframe motion prediction

    Video compression relies on predicting motion between frames. When there’s no change in a pixel, a video codec can save space by referencing it, rather than reproducing it. So improved motion prediction means improved file size and compression quality. Alongside the improved compression standards in H.265, we also find major improvements in motion prediction and compensation.

    Improved intraframe prediction

    Video compression also benefits from analyzing “movement” within individual frames, allowing single frames of video to be compressed more efficiently. This can be achieved by essentially describing pixels with a mathematical function rather than actual pixel values. The function takes up less space than pixel data, shrinking file size. However, the codec must support a sufficiently advanced mathematical function for this technique to be truly useful. H.265’s intraframe prediction function is far more detailed than H.264’s, allowing for 33 directions of motion over H.264’s nine directions.

    Parallel processing

    H.265 uses tiles and slices which can be decoded independently from the rest of a frame. This means that the decoding process can be split up across multiple parallel process threads, taking advantage of more efficient decoding opportunities on now-standard multi-core processors. With video resolutions getting higher, this kind of improved efficiency is required to decode video at a watchable pace on lower-end hardware.

    Higher maximum frame size

    The world is getting higher-res, and H.265 supports that. With H.265, video can be encoded at up to 8K UHD or 8192 pixels × 4320 pixels. Currently, only a handful of cameras can even produce 8K video, and very few monitors can display that kind of resolution. But just as HD is today’s standard, we can expect 4K and eventually 8K to rise to similar prominence eventually.

  3. Evening gents

    Quick question am currently shooting with GH5 10bit mp4 files am thinking will it improve speed if i convert from mp4 to Proress 422?

    files size wont matter as am ok for space ,i just want smooth editing and maybe better colors?

    thanks in advance

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