image grabber not working for short videos

[robbie1407]

file info:

General
Complete name : \\NAS\Family\IMG_1355.MOV
Format : MPEG-4
Format profile : QuickTime
Codec ID : qt 0000.00 (qt )
File size : 350 MiB
Duration : 33 s 260 ms
Overall bit rate mode : Variable
Overall bit rate : 88.2 Mb/s
Encoded date : UTC 2023-11-03 08:22:29
Tagged date : UTC 2023-11-03 08:23:03
Writing library : Apple QuickTime
com.apple.quicktime.location.accuracy.ho : 35.000000
com.apple.quicktime.location.ISO6709 : +52.4558+001.7035+013.021/
com.apple.quicktime.make : Apple
com.apple.quicktime.model : iPhone SE (3rd generation)
com.apple.quicktime.software : 17.1
com.apple.quicktime.creationdate : 2023-11-03T08:22:29+0000

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main@L5.1@High
Codec ID : hvc1
Codec ID/Info : High Efficiency Video Coding
Duration : 33 s 260 ms
Bit rate : 87.9 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 59.290 FPS
Minimum frame rate : 54.545 FPS
Maximum frame rate : 60.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Bits/(Pixel*Frame) : 0.179
Stream size : 349 MiB (100%)
Title : Core Media Video
Encoded date : UTC 2023-11-03 08:22:29
Tagged date : UTC 2023-11-03 08:23:03
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Metas : 3,4,5
Codec configuration box : hvcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 33 s 258 ms
Source duration : 33 s 321 ms
Bit rate mode : Variable
Bit rate : 192 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 776 KiB (0%)
Source stream size : 777 KiB (0%)
Title : Core Media Audio
Encoded date : UTC 2023-11-03 08:22:29
Tagged date : UTC 2023-11-03 08:23:03