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• Rotating gyro data in gopro footage with ffpmeg

  2 juillet 2023, par FPV Shenanigans

  I believe orientation of gyro data in some of my gopro clips is wrong. Reelsteady runs stabilization ok but it results in even worse than initial video shaky effect. I have filmed with gopro in 90 degree with orientation locked .

  


  Is it possible to amend metadata if ffmpeg to fix this ?

  


  the below is an example clip

  


  Metadata :
major_brand : isom
minor_version : 512
compatible_brands : isomiso2mp41
encoder : Lavf60.10.100
Duration : 00:04:30.22, start : 0.000000, bitrate : 119132 kb/s
Stream #0:00x1 : Video : hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(pc, bt709), 3840x3360 [SAR 1:1 DAR 8:7], 118934 kb/s, 59.94 fps, 59.94 tbr, 60k tbn (default)
Metadata :
handler_name : GoPro H.265
vendor_id : [0][0][0][0]
encoder : GoPro H.265 encoder
timecode : 13:27:43:05
Side data :
displaymatrix : rotation of -90.00 degrees
Stream #0:10x2 : Audio : aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
Metadata :
handler_name : GoPro AAC
vendor_id : [0][0][0][0]
Stream #0:20x3 : Data : none (tmcd / 0x64636D74)
Metadata :
handler_name : GoPro H.265
timecode : 13:27:43:05

  


  tried this

  


  ffmpeg.exe -i "F :\2023 THE ONLY COPY\Chasing surfers\GX010223.MP4" -c copy -metadata:s:v rotate=90 "F :\2023 THE ONLY COPY\Chasing surfers\GX010223_test.mp4"

  


  but reelsteady can't read metadata from a new video

  


• Issue with repairing 3GP video using untrunc - Error : bad track : 's263'

  2 juillet 2023, par sifirib

  I am trying to repair a corrupted 3GP video using the untrunc program, but I'm facing an issue due to an error.

  


  The command I ran :

  


  ./untrunc -v ~/Desktop/logic/Video0086.3gp ~/Desktop/logic/Video0035.3gp


  


  I am running Ubuntu 20.04 LTS and using the 'v308-d72ec32' version of the untrunc. The error message I encounter is as follows :

  


  Info: version 'v308-d72ec32' using ffmpeg '4.4.2-0ubuntu0.22.04.1'
Info: reading /home/hsrv/Desktop/logic/Video0086.3gp
Info: parsing healthy moov atom ... 
ftyp_ = 'mp42'
[amrnb @ 0x56075d7656c0] Multiple frames in a packet.
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/hsrv/Desktop/logic/Video0086.3gp':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2014-04-26T21:38:29.000000Z
    com.android.version: 12
  Duration: 00:02:22.80, start: 0.000000, bitrate: 154 kb/s
  Stream #0:0(eng): Video: h263 (s263 / 0x33363273), yuv420p, 176x144 [SAR 12:11 DAR 4:3], 140 kb/s, 10.74 fps, 11 tbr, 90k tbn, 29.97 tbc (default)
    Metadata:
      creation_time   : 2023-07-02T15:34:22.000000Z
      handler_name    : VideoHandle
      vendor_id       : [0][0][0][0]
  Stream #0:1(eng): Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono, flt, 12 kb/s (default)
    Metadata:
      creation_time   : 2023-07-02T15:34:22.000000Z
      handler_name    : SoundHandle
      vendor_id       : [0][0][0][0]
ss: s263 is_stable: 0
ss: using f=7 span
assuming constant duration of 640 for 'samr' (x1785)

Info: unknown track 's263' found -> fallback to dynamic stats
created dummy track 'free'
removed dummy track 'free'
first_failed: 0 of 101
simpleOrder: 0 
order ( 101): (0, 14) (0, 11) (0, 11) (0, 12) (0, 11) (0, 12) (0, 11) (0, 12) (0, 11) (0, 11) (0, 11) (0, 11) (0, 12) (0, 12) (0, 11) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 11) (0, 11) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 11) (0, 11) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 11) (0, 11) (0, 12) (0, 11) (0, 11) (0, 12) (0, 12) (0, 11) (0, 12) (0, 12) (0, 11) (0, 10) (0, 12) (0, 12) (0, 12) (0, 11) (0, 12) (0, 11) (0, 10) (0, 12) (0, 11) (0, 11) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 12) (0, 10) (0, 12) (0, 11) (0, 11) (0, 12) (0, 12) (0, 12) (0, 12) 
isTrackOrderEnough: 0  (sz=0)
genPatternPerm of: s263
0 s263 0.918296 3
1 samr 1 2
genPatternPerm of: samr
0 s263 4.8125 32
1 samr 0 1
has_zero_transitions_: 0
**Error: bad track: 's263'**


  


  This error message indicates that the untrunc program is having trouble with a track named 's263'. This track could be a track or codec within the video file.

  


  How can I resolve this error and successfully repair the corrupted 3GP video ? What steps should I follow or can you suggest an alternative approach ?

  


  Thank you in advance !

  


  I was expecting trunc tool to fix the corrupted/trunced video. But it gave me this error and no matter how much I searched for a solution, I couldn't find anything.

  


• ffprobe not showing language tag for ASS files in Ubuntu

  9 juillet 2023, par Efraín

  This is something that has me totally lost, because I'm not sure what could I have done, but from one week to another, "language" stopped appearing in the tags of an ASS track on a MKV. I know this just started to appear, because just last week I ended working on an script to detect the language of tracks, and today that I decided to test it again, I noted that it started to fail, and from my debug it's because ffprobe is now printing this

  


  {
    "index": 2,
    "codec_name": "ass",
    "codec_long_name": "ASS (Advanced SSA) subtitle",
    "codec_type": "subtitle",
    "codec_tag_string": "[0][0][0][0]",
    "codec_tag": "0x0000",
    "r_frame_rate": "0/0",
    "avg_frame_rate": "0/0",
    "time_base": "1/1000",
    "start_pts": 0,
    "start_time": "0.000000",
    "duration_ts": 1430816,
    "duration": "1430.816000",
    "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": {
        "BPS-eng": "85",
        "DURATION-eng": "00:23:34.830000000",
        "NUMBER_OF_FRAMES-eng": "262",
        "NUMBER_OF_BYTES-eng": "15128",
        "_STATISTICS_WRITING_APP-eng": "mkvmerge v40.0.0 ('Old Town Road + Pony') 32-bit",
        "_STATISTICS_WRITING_DATE_UTC-eng": "2023-07-02 11:29:54",
        "_STATISTICS_TAGS-eng": "BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES"
    }
}


  


  Where it should be a field called "language" in the "tags", like this(Note that other file types, like SRT, or audio tracks show it correctly)

  


  "tags": {
    "language": "eng",
    "BPS-eng": "128000",
    "DURATION-eng": "00:23:50.813000000",
    "NUMBER_OF_FRAMES-eng": "61620",
    "NUMBER_OF_BYTES-eng": "22893018",
    "_STATISTICS_WRITING_APP-eng": "mkvmerge v40.0.0 ('Old Town Road + Pony') 32-bit",
    "_STATISTICS_WRITING_DATE_UTC-eng": "2023-07-02 11:29:54",
    "_STATISTICS_TAGS-eng": "BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES"
}


  


  The weird part is that is the same file I used for testing(And it worked), and I haven't edited it, so I'm not sure why is this happening, Does someone knows if I might have messed up something installing a library for another thing that might have caused it ?

  


  Just in case is necessary, this is the command I use : ffprobe -v quiet -print_format json -show_streams <file></file>