Originally Posted by FoxAdriano
Hi, if I shoot in UHD 50p, 8bit, 150Mbps, PAL system with my GH5, how have I to export from Edius timeline to get the best image quality? Is it better to export .H264 or or XAVC file? Which of two files give me the best image quality? Thanks
You are going to have to try them both out. Both are h.264 but within different containers, XAVC is Sony's container, h.264 is the codec to be exported within mov, mp4, mkv and XAVC containers. The containers describe what's within with metadata. But remember this, h.264 describes the method for how a stream is to be decoded so that players, TVs and other devices can decode for playback. How the stream is actually encoded is where there could be qualitative differences. For example, h.264 could be encoded with codecs from MainConcept, Elecard, VLC, QuickTime, x264 to name just a few. You won't necessarily know which brands of codec are included in the NLE library. All the codecs offer unique features and options that could make one better or worse than another for a particular usage. That's why you have to experiment in Edius yourself, to find which one is the best match for your intended file size, bit rate, bit depth, chroma sub sampling, quantization, motion smoothing and supported audio codecs. Edius will probably consolidate the available options into a few, to simplify your choice. So look what options you have within the container, XAVC, MOV, MKV, MP4 etc. The supported audio codecs could be the determinant in your final choice.
For the highest quality implementations it may be necessary to work outside the NLE. x264 has consistently been among the very best encoding codecs for enabling the highest visual quality with the lowest bitrate. The x264 library is often linked within many GUI programs including the most popular one, Handbrake, and compiled binaries of ffmpeg. Lossless encoding is possible with x264 but with high bitrate huge file sizes would result. Lossless is the ultimate expression, but what most people want is a more reasonable accommodation of quality versus bitrate. So that's what you are really looking to compare, which codec option within Edius, mp4, MOV, XAVC is going to have the best visual quality at the intended bitrate considering motion, supported audio codec. Pick a representative scene of just a few seconds, and experiment encoding the scene with the different options to arrive at the one that you feel best accomplishes your goal.
Ken Ross is an Edius user so he may be the best person to put you on a fast track.