I have a few questions about HD video and my camcorders. I first had a Panasonic HC-V100 camcorder. It needed to be repaired so I sent it back to Panasonic (2x). They couldn’t fix it so they sent me a refurbished HC-V201. That’s what I have now. It can do 1080p, the VC-100 could only do 1080i. (Both can do iFrame and mp4 as well.) I have tried shooting 1080p. Supposedly that is better for showing on computers than 1080i but my experience has been that all of my 1080p video stutters/has jitter when playing back. I should explain my workflow. With both cameras, I will copy the files from the camcorder onto the computer first. With OSX 10.6.8 I would dig into (open up the package) where the .mts files were and only copy those. (That may explain one problem I am having, out of sync audio with files after the first file. More on that later.) I have upgraded to OSX 10.9 and now I am seeing a file labelled AVCHD. (Get Info calls it "AVHCD Content”. Is it a package?) With 10.6.8 I would control-click and open the package. I tried that with 10.9 but I think I will approach it differently. With 10.6.8 I would re-wrap them with Media Converter (http://media-converter.sourceforge.net/) as Quitcktime so I could deal with them with iMovie HD (6.0.4) (I hate and won’t use versions above it but I do like the iMovie 10.0 though and may use that. And what’s with the version number going backwards? I could use an IMovie 11 with 10.6.8.) With 10.9 I now will open them with QT Player 10.3 which, if there is more than one recording/file on the camera, will offer me a choice of which movie to open. (Why does the file creation date of the AVCHD file not have the date of the recording? It looks like it has the date I formatted the memory card on the camcorder… That can be confusing… Thank goodness QT Player does show the correct recording date on the title bar of the movie being played and iMovie will show the correct date as the title as well.) So, in the past, I would rewrap HD video so I could edit it. Now it will depend on how I am going to use it. Here’s what I’m thinking. I may, when I just want to trim and export a clip, use QT Player 10.3 to Save As (now called “Export" in QT 10.3) 1080p. Using that in the past, I have found that I can reduce file size 10x this way and I haven’t seen a noticeable decrease in quality. The video remains as HD too. Is it true that the major difference between the original file and a file saved as 1080p this way is the lower bitrate (data rate)? If I need to do more than just trim the ends, I’ll use iMovie HD or 10. I do have some questions about the best way to save/export from there. 1) Most times I want to export a CLIP, not the whole movie (or set of files that iMovie is calling a movie, event or whatever.) I want to export any clip shot as HD as HD but I want to have the smallest file-size I can while still retaining a large picture. With iMovie HD I found that the Share (export, save as, it gets called so many things…) as CD-ROM worked pretty well for most SD video. With HD, I am finding I can export (share, whatever) as full quality and then using QT Player (the versions that came with 10.6.8 or 10.9) to Save As (export, whatever) 1080p. That reduces the file size 10x and the picture quality seems good. Versions of iMovie after HD 6.0.4 won’t let you export (save as, whatever) a clip. They only think I want to export the whole gd movie. It looks like I might be able to work around that with iMovie 10 (that comes with OSX 10.9) but that may not work out. How would YOU recommend I do things so I can export CLIPS from a set of files? Many of my recordings are concerts and I want to upload individual songs to YouTube. The workaround for iMovie versions between the OSX 10.9 version and HD 6.0.4 has been unworkable for me so I just used HD 6.0.4. I do like that 10.9’s iMovie has presets for YouTube. (I might save as 1080p and then import that file into iMovie just so I can upload it to YouTube with the specs they like.) Back to the problems. Problem #1) Why does 1080p jitter/stutter when there are pans/action? I don’t pan too quickly but I get jitter anyway when I shoot in 1080p. Ir doesn’t happen when I shoot in 1080i. I would like to shoot in 1080p but will do 1080i if there is no way around this problem. Problem #2) Each camcorder splits the video, creating a new file after a certain amount of recording time. The VC-100 would do it after an hour, the HC-V201 does it after 35 minutes (for AVCHD.) I never had a problem with audio being out of sync for recordings longer than that first file with the VC-100. I do have that problem with the HC-201 BUT that was using my old workflow of using just the .mts files, not the whole "package." So the question is, is that why the audio got out of sync? I’ve done some test recordings using the whole package and can’t tell if audio is out of sync or not. Is there a problem with my camcorder? Additional questions: I’ve seen, over the years, various settings that are recommended for uploading to YouTube. What would your recommendations be? Most of my video will be uploaded to either YouTube or Facebook. I want them to remain HD but I don’t want large files sizes since I keep the files on my computer and don’t want large file-sizes. With 10.9 I see the “package” for video shot on the camcorder is titled AVCHD and has a creation date of when the memory card was formatted. Digging into the “package” (what is is really?) the next things I see are two folders and a file titled BDMV. That too is titled AVHCD content by Get Info. Digging into that I see the Stream folder and in that, the .mts file. Why does 10.9, and probably versions 10.7 and 10.8, show the package/files that way? What should I know about them? I have run across Floh’s excellent video "Codecs and Containers - the wonderful world of video files” which has helped immensely with understanding HD video. I’m also curious about how OSX deals with it. Not so much the deep technical details but more how to work with it. That will do for now. I hope some of my questions can be answered. Thanks very much. Cheers, John L PS Why does a "package" (straight from the camcorder) labelled AVCHD in OSX become a folder when I rename it?