Using Breaking Bad as an example (the episodes are pretty consistent in content and almost exactly the same length), I setup Handbrake to compress season 3 and went to bed. What I am seeing though is consistent across an entire season of a TV show. I understand this may result in varying bit rates depending on the actual content of what I am compressing. I'm setting a constant quality using the slider, and I leave it at the default of 20. I expect to see a small variance, say <1% but what you are seeing is. If having a predictable file size is more important than managing output size, I'd play with increasing your CQ Value and seeing if you notice a difference, or move to the slower two-pass encoding method which will give you much more predictability in your output size as the priority and then give you the best possible quality across the video stream within that bitrate envelope.Įdit: Oh, Wait, you are saying you are encoding the Same episode from the same season twice and getting huge differences in file sizes? Wow. My Blu Ray Rips using a CQ18 in RipBot264 started out at about 4GB each, and starting with Season 6 (or 7 i can't remember which right now) using the same encoder and the same settings they dropped to 2GB in size after compression.Īnd by this discussion, I'm assuming you are using the stock Handbrake CQ mode - Which is great for ensuring quality, but not file size. So even though its the same show you can expect to see changes in how x264 can compress effectively depending on how the source material changes and advances with each successive season. The source Material and your Encoding method.Īs content providers change their cameras, filters, tools and workflows you can see some radical changes to the "Compressability" of a video stream. I'm really at a loss, and it's frustrating that I could compress everything once and get nice small files, or have to recompress everything endlessly until the planets align. My question is this Assuming that I am using the same version of Handbrake and the same exact profile for all of my compression, what other factors might be contributing to this variation that I'm seeing? I'm doing this on Windows 7 with a Core i7 930 2.8GHz, 12 GB RAM, and I'm encoding from one 7200 RPM disk for the source files to another disk for the result set. The video quality is exactly what I'm looking for and doesn't seem to vary at all between what I'm getting with 8 GB files versus 2 GB. Going back and checking some of my other content, I'm noticing the same issue with huge files for some seasons, and very small files for others. Since then, I've gone back and re-compressed the other seasons with varying results. Figuring that couldn't be right at all, I recompressed the episodes from the same exact MKV files and ended up with compressed M4V files between 1.8-2.9GB, much more in line with what I was expecting. When I first compressed season 4 I got files that were almost as large as the original mkv file ripped from the disc, around 7GB. I've been testing with Breaking Bad recently, as that is what I was working on when I first noticed this. I understand that compression will vary depending on the content of the video, but that isn't what I'm talking about. The curious part is that I'm getting wildly different file sizes from the same source material. I saved this off to a custom profile and I've been using that for everything I rip. The only change I make is that I switch the audio to DTS or AC3 pass-thru and add another track for the down mix. I've been using the Normal profile because I don't care to mess with things too much. I've recently been ripping my Blu-ray collection to disk with MakeMKV and compressing with Handbrake to x264. I'm seeing some odd results from Handbrake and I'm having a really hard time determining the cause.
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