Maybe a noob question but can someone point me to where I can activate storage of the SRT video caption file on my Spark? I have searched the forums and only find options for the Phantom and others but not Spark.
Thanks for your time and any information you can provide,
SparkySurvey

Sorry to tell that Spark is not equipped with SRT video caption file.

DJI Thor Posted at 2017-7-30 01:57
Sorry to tell that Spark is not equipped with SRT video caption file.

Hi Thor,
Why are basic data files that are already stored on the flight logs not output on Spark? It seems like needless extra effort to downgrade capability. For example the GPS coordinates in exif data are degrees, minutes, seconds as integers. This gives you a general area but on the map the precise decimal degree is recorded where I can't get at it. Why would DJI do this?

SparkySurvey Posted at 2017-7-31 14:30
Hi Thor,
Why are basic data files that are already stored on the flight logs not output on Spark? It seems like needless extra effort to downgrade capability. For example the GPS coordinates in exif data are degrees, minutes, seconds as integers. This gives you a general area but on the map the precise decimal degree is recorded where I can't get at it. Why would DJI do this?

In case this comment wasn't clear here is the output from a Pix4D process. The GPS records written to exif are the red dots the actual location of the images from photogrammetry are in green. Why this would be done when there is a computational cost is beyond me.

SparkySurvey Posted at 2017-7-31 14:30
Hi Thor,
Why are basic data files that are already stored on the flight logs not output on Spark? It seems like needless extra effort to downgrade capability. For example the GPS coordinates in exif data are degrees, minutes, seconds as integers. This gives you a general area but on the map the precise decimal degree is recorded where I can't get at it. Why would DJI do this?

Because it is the design of the Spark. I will transfer this requirement to our engineers. Hope we can add this function, and users can grab the flight specs by reading the SRT files, too.

Honestly, that's a really good question.

There's no plan for Spark to provide video caption

Well that's unfortunate given the data it collects automatically. DJI missed the boat in the pursuit of profit margins. Aim for mediocre and hit it

What a disappointment. My mapping company uses video with SRT files and thus can't use the Spark. I wish DJI would make this standard feature we've been using for so long available in their newest quad.

nhoover Posted at 2017-12-2 12:38
What a disappointment. My mapping company uses video with SRT files and thus can't use the Spark. I wish DJI would make this standard feature we've been using for so long available in their newest quad.

I completely agree -- such simple, trivial, and useful features, are reserved for more expensive drones? I don't like DJI's bait-and-switch routine where they promise you the world but fail to deliver.

Considering the streaming I/O bandwidth necessary to wrap the video in a MP4 container, why doesn't DJI add an additional data track to the video file like GoPro? No separate files but the data is ready to be used by DJI software or give customers the ability to copy that data track and export it to a SRT.

It's not that difficult to do within the power constraints of the Spark.

Why not give the users what they want and if they want a better camera and longer runtime, upgrade.

Come on DJI... Little things like this are making me reconsider my investments in DJI.

Similarly for disabling automatic modes which are the reason that I purchased the Spark to begin with -- I paid for something I literally cannot use.

Poor form DJI. Poor form.

MuffintopSpeedo Posted at 1-24 10:02
I completely agree -- such simple, trivial, and useful features, are reserved for more expensive drones? I don't like DJI's bait-and-switch routine where they promise you the world but fail to deliver.

Considering the streaming I/O bandwidth necessary to wrap the video in a MP4 container, why doesn't DJI add an additional data track to the video file like GoPro? No separate files but the data is ready to be used by DJI software or give customers the ability to copy that data track and export it to a SRT.

Here is an example of how GoPro does it:
{
    "streams": [
        {
            "index": 0,
            "codec_name": "h264",
            "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
            "profile": "High",
            "codec_type": "video",
            "codec_time_base": "1001/60000",
            "codec_tag_string": "avc1",
            "codec_tag": "0x31637661",
            "width": 1920,
            "height": 1080,
            "coded_width": 1920,
            "coded_height": 1088,
            "has_b_frames": 1,
            "sample_aspect_ratio": "1:1",
            "display_aspect_ratio": "16:9",
            "pix_fmt": "yuvj420p",
            "level": 41,
            "color_range": "pc",
            "color_space": "bt709",
            "color_transfer": "bt709",
            "color_primaries": "bt709",
            "chroma_location": "left",
            "refs": 1,
            "is_avc": "true",
            "nal_length_size": "4",
            "r_frame_rate": "30000/1001",
            "avg_frame_rate": "30000/1001",
            "time_base": "1/90000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 7525518,
            "duration": "83.616867",
            "bit_rate": "29993280",
            "bits_per_raw_sample": "8",
            "nb_frames": "2506",
            "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
            },
            "tags": {
                "creation_time": "2018-10-27T10:41:14.000000Z",
                "language": "eng",
                "handler_name": "\tGoPro AVC",
                "encoder": "GoPro AVC encoder",
                "timecode": "11:02:41:27"
            }
        },
        {
            "index": 1,
            "codec_name": "aac",
            "codec_long_name": "AAC (Advanced Audio Coding)",
            "profile": "LC",
            "codec_type": "audio",
            "codec_time_base": "1/48000",
            "codec_tag_string": "mp4a",
            "codec_tag": "0x6134706d",
            "sample_fmt": "fltp",
            "sample_rate": "48000",
            "channels": 2,
            "channel_layout": "stereo",
            "bits_per_sample": 0,
            "r_frame_rate": "0/0",
            "avg_frame_rate": "0/0",
            "time_base": "1/48000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 4014080,
            "duration": "83.626667",
            "bit_rate": "128000",
            "max_bit_rate": "128000",
            "nb_frames": "3920",
            "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
            },
            "tags": {
                "creation_time": "2018-10-27T10:41:14.000000Z",
                "language": "eng",
                "handler_name": "\tGoPro AAC",
                "timecode": "11:02:41:27"
            }
        },
        {
            "index": 2,
            "codec_type": "data",
            "codec_tag_string": "tmcd",
            "codec_tag": "0x64636d74",
            "r_frame_rate": "0/0",
            "avg_frame_rate": "29/1",
            "time_base": "1/90000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 7525518,
            "duration": "83.616867",
            "nb_frames": "1",
            "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
            },
            "tags": {
                "creation_time": "2018-10-27T10:41:14.000000Z",
                "language": "eng",
                "handler_name": "\tGoPro TCD",
                "timecode": "11:02:41:27"
            }
        },
        {
            "index": 3,
            "codec_name": "bin_data",
            "codec_long_name": "binary data",
            "codec_type": "data",
            "codec_tag_string": "gpmd",
            "codec_tag": "0x646d7067",
            "r_frame_rate": "0/0",
            "avg_frame_rate": "0/0",
            "time_base": "1/1000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 83627,
            "duration": "83.627000",
            "bit_rate": "38667",
            "nb_frames": "83",
            "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
            },
            "tags": {
                "creation_time": "2018-10-27T10:41:14.000000Z",
                "language": "eng",
                "handler_name": "\tGoPro MET"
            }
        },
        {
            "index": 4,
            "codec_type": "data",
            "codec_tag_string": "fdsc",
            "codec_tag": "0x63736466",
            "r_frame_rate": "0/0",
            "avg_frame_rate": "0/0",
            "time_base": "1/90000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 7525518,
            "duration": "83.616867",
            "bit_rate": "10007",
            "nb_frames": "6511",
            "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
            },
            "tags": {
                "creation_time": "2018-10-27T10:41:14.000000Z",
                "language": "eng",
                "handler_name": "\tGoPro SOS"
            }
        }
    ],
    "format": {
        "filename": "data.GoPro.x/2018-10-27T10.41.14.000000Z.MP4",
        "nb_streams": 5,
        "nb_programs": 0,
        "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
        "format_long_name": "QuickTime / MOV",
        "start_time": "0.000000",
        "duration": "83.626667",
        "size": "315445162",
        "bit_rate": "30176514",
        "probe_score": 100,
        "tags": {
            "major_brand": "mp41",
            "minor_version": "538120216",
            "compatible_brands": "mp41",
            "creation_time": "2018-10-27T10:41:14.000000Z",
            "firmware": "HD5.02.02.60.00"
        }
    }
}