[FFmpeg-user] Sony FX3 timecode (or the lack of it...)

[Bouke / edit 'B]

This cam writes Mp4 without a QuickTime timecode track, but it does write ’something’ that ’should’ be (about) correct. (It’s a known issue it’s off by one or two frames when slaved.)

ffprobe -v error -print_format json -show_format -show_streams /Users/bouke/Downloads/Sony\ FX3/PRIVATE/M4ROOT/CLIP/20240227_C6917.MP4 
Partial return:

{
            "index": 2,
            "codec_type": "data",
            "codec_tag_string": "rtmd",
            "codec_tag": "0x646d7472",
            "id": "0x3",
            "r_frame_rate": "0/0",
            "avg_frame_rate": "0/0",
            "time_base": "1/30000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 1261260,
            "duration": "42.042000",
            "bit_rate": "4664775",
            "nb_frames": "1260",
            "disposition": {
                "default": 1,
                "dub": 0,
                "original": 0,
                "comment": 0,
                "lyrics": 0,
                "karaoke": 0,
                "forced": 0,
                "hearing_impaired": 0,
                "visual_impaired": 0,
                "clean_effects": 0,
                "attached_pic": 0,
                "timed_thumbnails": 0,
                "captions": 0,
                "descriptions": 0,
                "metadata": 0,
                "dependent": 0,
                "still_image": 0
            },
            "tags": {
                "creation_time": "2024-02-27T10:22:27.000000Z",
                "language": "und",
                "handler_name": "Timed Metadata Media Handler",
                "timecode": "05:37:06:19"
            }
        }



Now, where is this TC stored? I cannot find it using a HEX editor.
And, more important, FCP, Avid MC and Resolve interpret the “timecode” as Drop frame, where there is no indication of that in FFmpeg / FFprobe.
Can anyone shed a light on this?


thx,

Bouke