![]() GopPicSize: 249 GopRefDist: 4 GopOptFlag: closed IdrInterval: 0 Using the constant quantization parameter (CQP) ratecontrol method Initialized an internal MFX session using hardware accelerated implementation audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2 Value 1.000000 for parameter ‘seekable’ out of range Reinit context to 2704x1520, pix_fmt: yuvj420p Plugin_mgr_get_object_file_plugins: error opening shared object file ‘C:\Program Files\Shotcut\lib\ladspa/readme.txt’: “C:\Program Files\Shotcut\lib\ladspa\readme.txt”: Plugin_mgr_get_object_file_plugins: error opening shared object file ‘C:\Program Files\Shotcut\lib\ladspa/COPYING’: “C:\Program Files\Shotcut\lib\ladspa\COPYING”: The specified module could not be found. Plugin_mgr_get_object_file_plugins: error opening shared object file ‘C:\Program Files\Shotcut\lib\ladspa/AUTHORS’: “C:\Program Files\Shotcut\lib\ladspa\AUTHORS”: The specified module could not be found. It will likely be indistinguishable from the source and not result in a huge, possibly incompatible file like true lossless mode.I have tried changing the GOP to 249, now the file is 5.87 GB (slighter lighter, but still very large for a 45 sec video). Tip: If you’re looking for an output that is roughly “visually lossless” but not technically lossless, use a -crf value of around 17 or 18 (you’ll have to experiment to see which value is acceptable for you). Therefore, if compatibility or file size are an issue, you should not use lossless. Note that lossless output files will likely be huge, and most non-FFmpeg based players will not be able to decode lossless. Two useful presets for this are ultrafast or veryslow since either a fast encoding speed or best compression are usually the most important factors.įfmpeg -i input -c:v libx264 -preset ultrafast -crf 0 output.mkvįfmpeg -i input -c:v libx264 -preset veryslow -crf 0 output.mkv You can use -crf 0 to create a lossless video. the human eye can’t see the difference) don’t go above 67%. There is no compression and quite a few video players will probably have difficulties playing the resulting file properly. I assume these are acting in tandem and essentially producing the same outcome regardless of which is used?ġ00% means lossless. There’s the “Use hardware encoding” checkbox with the “configure” button next to it. Regarding the export dialog (advanced), it seems there are 2 ways to select hardware encoding. Why would using the libx264 (software) codec produce a file so much larger than when using a hardware codec? I’m not sure what vaapi is though or why it even works for me to begin with? What exactly is hw-vaapi? I mean, I know it’s hardware related and I gather that hw-nvenc didn’t work because I’m probably not using the non-free Nvidia bits on my system. File size of 178MBįrom the above, I’ve got a few questions: Some additional results from various tests of a small 30 second export What other information should I be providing here in order to help nail this down? Shifting the audio by 6 or 7 frames as suggested in other threads doesn’t feel like the right move as I have no point of reference and it just feels like I’d be flying blind.Īlso, what is this “ProRef” export preset I’ve been reading about in this forum? I’m running 20.06.28 and I don’t see that preset? I don’t understand this and could use some help in deciding what to do. My take on all this is that there is most definitely a direct relationship between the quality and the resulting sync issue. File size doubled but the lag was most definitely noticeable. Then I ran another job with the Youtube quality bumped to 85. In other words, it seemed to be in sync in the beginning but became out of sync as it progressed. This resulted in a file size of 312mb and I was able to somewhat notice the video lag as the resulting file was played from start to finish. Using the same Youtube export, I ran another export job but with a modified quality value of 75 (up from the default of 55). Here’s the file’s meta information as reported by smplayerįile: /data/mtf8/Cavity/video/shotcut/export/Cavity2.mp4 The export mentioned above is 72mb in size. FYI, my audio is on its own track and I’ve got 2 other tracks of various video clips that weave in and out with various transitions and filters. ![]() Using the Youtube preset with the default quality allowed me to export a file with audio and video that is in sync and represents the work I’ve done in my timeline. Continuing this thread as disabling hardware encoding has gotten me only so far.
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