I'm an experienced audio engineer but nearly 100% clueless with video! I'd like to see someone talk about how to keep already lossy video 1:1 with the original. Preparing audio for bluray seems to ironically be the easy one these days. The different levels of lossy video formats are the confusing ones! How to preserve the video as is without re-encoding it? What video formats accept lossless PCM audio (max 48k is just fine in this example)? What ones require going to lossy audio? What lossy options do you get to choose from in this example? These are the questions that I get the 12-volt stare to. For example, if this was audio we would discuss how mp3 can be copied as a file 1:1 but decoding it back to wav and re-encoding it to mp3 would add another level of loss. Or how a 16 bit file can be put into a 24 bit format and preserved 1:1 but not the reverse. The mpeg-4/mov render option in Reaper of course re-encodes the video. What apps can be used to handle and keep intact the video component? Anyone know of a good reference chart for video? What formats can be put into what file container and what keeps things 1:1 vs. re-encoding? Today's task is this video file: Duration: 0:53:11 Data Size: 1.46 GB Bit Rate: 3.92 Mbps Video Tracks: H.264, 960 × 540, 29.97 fps, 3.79 Mbps That info comes from MPEG Streamclip. This app lets you separate audio out and do some conversions (not all of which are clear) but has no function to replace a video file 1:1 with an original. Setting the output to 100% quality for example tries to produce a lossless format file (around 12GB) from the lossy source. I get that there might be some paid apps required. I get that some of this might be proprietary information. I'd sure appreciate it if someone could at least point me to some kind of cross reference chart or something though! PS. I am NOT looking for a critique of lossy formats like one might be tempted to offer for mp3. That's all useful info and well and good but I just want to know how to preserve any video 1:1 regardless of any format decisions made upstream.