This test informally confirms the theory that multiple conversions in the same format lose less data than multiple conversions across different formats. The louder the playback, the more difference there was compared to the original PCM.Īlthough Opus and AC3 had the same average difference, AC3 had a wider variance around -51 dBFS, which means greater overall distortion than Opus.ĪAC, of course, had insanely loud playback to signify that it can’t encode a sine wave to save its life. Measure the dBFS of playback, which is the difference between the original sine wave and a double-converted sine wave.
OMPLAYER MP4 GLITCHING PLUS
Using track mutes, play the original PCM sine wave plus one of the inverted lossy sine waves.Align and invert the double-converted files from Step 3.Bring files from Steps 1 and 3 into Audacity.Convert files from Step 2 to Opus at 192k (YouTube’s audio bitrate for 4K uploads).Convert sine wave to AAC at 576k and AC3 at 640k and Opus at 512k (max allowed for each).Generate a 1 kHz -12 dBFS sine wave as pcm_s24le 48kHz.The test is a bit limited because it’s based on sine waves rather than real music, but it’s a start. I had a theory that Opus -> Opus would have less conversion loss than AC3 -> Opus, but never tried to prove it until now. I did another round of tests to measure distortion due to double format conversion. Here is a Dropbox link for the test problem: I am always using aac audio codec and, for rate control, I’ve tried average, constant, and quality-based VBR. I tried the default YouTube settings, activating and de-activating both parallel processing and hardware encoder. The audio peak meter is always below -6, mostly below -10. The original file is clean (no noise) and the playback on editing mode is also normal except from lag-generated noises. I am running the latest version of Shotcut and already tried re-installing it. mp4 video and the problem still persists. I usually have 2-3 video tracks (.mp4/60FPS) and a single audio track (.wav), but I made a simple test problem with a single audio file (.wav or. I have gone through many other similar posts, but could not find a solution. My last option would be to just use After Effects to deal with my videos, however this isn't preferable.I am having problems with crackling, popping, distorted, crunched paper kind of sounds in my exported videos. Its almost brought my workflow to a grinding halt. Please - any help would be greatly appreciated. The original video plays smoothly in video players, so I do not think its an issue with the video. rending out the video is also glitchy, strobes and skips.
ASUS Strix SCAR II Gaming Laptop, GeForce GTX 1070, 8GB, i7 8th Gen
OMPLAYER MP4 GLITCHING SOFTWARE
changed from 'Mercury Playback Engine GPU Acceleration' to 'Mercury Engine Software Only'. Hopefully I've made sense - its a odd issue. When I would trim the video, it would strobe again, and often just play the clip from the start. On top of that, if I was to place my scrubber halfway through the video, it would show frame 1 of the video, and play the video from the start, despite my scrubber being halfway through. I would press play, and the video playback would be super laggy, but on top of that, different frames from other parts of the video would strobe ( See below:).Īlso, I cannot scrub smoothly - it would strobe different frames from the video. When I import a video into Premiere, and try to play it, it's very glitchy.
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