12-23-2018 01:13 AM
Audio RAW Hero 7 - asynchronous and too short - not usable!
I did some recording, using RAW Audio, my experience: forget RAW Audio!
Gopro Hero 7 Black offers ability to record an additional wav file to the mp4 video, which contains all three channels, stereo K1 right K2 left and mono front micro K3. This wav file is not in sync with the eponymous mp4 video. In addition, the wav file is shorter than the mp4 file, it lacks 4 frames in the lower example and about 28 frames in the back.
Example from 22.12.2018, NLE Adobe Premiere Pro CS6:
Video clip 2,7k / 50p, PAL, linear GH010066.mp4 -1m19ss12ff, = 1: 19: 23040 audiosamples
Audio RAW, low, GH010066.wav -1m18ss.06ff, = 1: 18: 11520 audiosamples
If the beginning of the video file is 0 on the timeline, then the beginning of the wav file must be shifted 4 frames to the right, so that it is almost synchronous.
However, to adjust sync correctly, by right-clicking on the name of the sequence on the top left of the timeline and selecting the option "Show audio time units" in the new menu.
Now you can synchronize the soundtracks at a click sound, then you can disable this display option again and cut frame wise exactly.
Due to the synchronization of the mp4 video track with the raw audio tracks, the video track has to be shortened, at the front by 4, at the back by 28 frames. The clip, which was previously 1m19ss12ff long, is thereafter only 1m18ss05ff long, so lacks about 1 whole second !!
Now you can link the two stereo tracks K1 and K2 with the video track of the mp4 file (before you delete the audio track or separates it and moves it down to an empty audio track that you mute).
With so much reworking the use of the RAW audio of the Hero 7 makes no sense. The small advantage of sound quality is worth the time expenditure by no means. The sound quality behind the UW micromembrane is not inspiring anyway, only useful for voice recordings in family movies.
Gopro praises RAW Audio as a great feature, but conceals the asynchronism in the cut. As long as Gopro does not provide exact synchronicity, this is a completely useless feature.