Just found this video on my recommended feed, fantastic job, a really good and solid explanation of how containers and codecs work, invaluable for somebody like me who is still at the learning stage. Thank you for presenting this in a clear and understandable format, very much appreciated ;)
Thank you a lot David, great explanation I didn't think to watch all the 43 minutes to be honest but seeing it I managed to finish it and I enjoyed this lesson Thanks again
I actually remember, going back many years, probably towards the very beginning of digital TV, before the switchover, where if a TV station was broadcasting old material that was originally shot on film (very likely 16mm film) you would see what I can best describe as a floating background. On original film (or indeed on the analogue broadcast) the picture looked mostly steady or if you noticed drift, everything drifted together. On the digital broadcast, the background would drift while actors in the foreground stood still. Whether that was because this was a time when TV stations still ran telecine direct from the film which they hadn't gotten round to digitising yet or down to the quality of the technology back then, I don't know.
I just have to say very nice tone of voice, rythm, very good grama and all'n all very clear explaining ;) Bravo ! You could be presenting practically everything (outside maybe live gossip news) and the one listening will actually register 99% of the information whie even doing chores at the same time :)
The section that is a bit unclear is the bit rate. Assuming we are only talking within the context of one codec, and variable bit rate, so the value given is it the average over a clip? The actual bit rate at any particular point in time will vary, depending on the compression. Presumably, when compression is low, bit rate will be high and exceed the average. For constant bit rate, why should the compressor bother to compress further when it gets to the point that it has compressed enough to meet the constant bit rate value?
Color subsampling is almost as evil as interlacing. We can't see a difference (washed out digital look) because the capture is subsampled too. You can't put up a red caption, and have either stairsteps around red or a dark outline because the color is interpolated without gamma correction. I suspect those blocks in low contrast areas are down to a limited 'mixing' bit depth and many transformations that a block goes through between frames in h.264 (like chroma separation, darkening, weighting). You can throw bit rate at the frame, and the blocks don't go away in 8-bit format.
For editing and archival, if my initial clip is dvd res, why would I archive the clip at high res? You only need to archive to the same initial res? Do you have any opinions on FFV1, lossless H264 or any other lossless codec for archiving? Thank you. Only made typo and minor word changes.
You can find Part 2 of this series (Understanding Export Settings - Video Tutorial) by clicking here => ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-RP_Pso1mPb8.html
