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• ffmpeg extract frame and get timestamp based on creation time for each extracted frame in exif or txt

  4 août 2021, par Scaling

  I try to extract frames from a underwater survey video using ffmpeg. the extracted frames should be merged with a gps position based on a timestamp later in the process. the code i use to extract the frames is :

  



  ffmpeg -i GOPR0173.MP4 -qscale:v 2 -r 1 frames/%4d.jpg.

  



  I need a solution to get the real timestamp of the frame based on the survey datetime, so that the timestamp of the frame equals the real time when the video was created. Ideally the timestamp is saved in the images exif or if this is not possible in a seperate textfile and the timestamp is used as name of the files like 2020_01_01_HH_MM_SS.jpg.

  



  My idea is to use the creation_time of the video add the timestamp of the frame to this and store the result in the exif of the extracted frame or if this is not possible in a txt file.

  



  Im new to ffmpeg and really lost and would appreciate any help to solve this task !
If anyone could provide me the necessary code, that would be awesome !

  



  C:\Unterwasserfotos>ffmpeg -i GOPR0173.MP4 -vstats -qscale:v 2 -r 0.1 frames/%4d.jpg
ffmpeg version git-2020-01-21-fc6fde2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls
 --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enabl
e-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-
libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwol
ame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enab
le-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable
-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable
-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enabl
e-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 38.100 / 56. 38.100
  libavcodec     58. 66.100 / 58. 66.100
  libavformat    58. 35.104 / 58. 35.104
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 71.100 /  7. 71.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'GOPR0173.MP4':
  Metadata:
    major_brand     : mp41
    minor_version   : 538120216
    compatible_brands: mp41
    creation_time   : 2020-01-21T12:33:10.000000Z
    firmware        : HD4.02.05.00.00
  Duration: 00:02:21.85, start: 0.000000, bitrate: 30152 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1920x1080 [SAR
 1:1 DAR 16:9], 30000 kb/s, 50 fps, 50 tbr, 90k tbn, 100 tbc (default)
    Metadata:
      creation_time   : 2020-01-21T12:33:10.000000Z
      handler_name    :         GoPro AVC
      encoder         : GoPro AVC encoder
      timecode        : 12:33:11:16
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (defa
ult)
    Metadata:
      creation_time   : 2020-01-21T12:33:10.000000Z
      handler_name    :         GoPro AAC
      timecode        : 12:33:11:16
    Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
    Metadata:
      creation_time   : 2020-01-21T12:33:10.000000Z
      handler_name    :         GoPro TCD
      timecode        : 12:33:11:16
    Stream #0:3(eng): Data: none (fdsc / 0x63736466), 12 kb/s (default)
    Metadata:
      creation_time   : 2020-01-21T12:33:10.000000Z
      handler_name    :         GoPro SOS
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'frames/%4d.jpg':
  Metadata:
    major_brand     : mp41
    minor_version   : 538120216
    compatible_brands: mp41
    firmware        : HD4.02.05.00.00
    encoder         : Lavf58.35.104
    Stream #0:0(eng): Video: mjpeg, yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s,
 0.10 fps, 0.10 tbn, 0.10 tbc (default)
    Metadata:
      creation_time   : 2020-01-21T12:33:10.000000Z
      handler_name    :         GoPro AVC
      timecode        : 12:33:11:16
      encoder         : Lavc58.66.100 mjpeg
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame=   16 fps=0.3 q=2.0 Lsize=N/A time=00:02:40.00 bitrate=N/A dup=0 drop=7076 speed=3.26x
video:1938kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown´´´









  


• kmsgrab : Use GetFB2 if available

  5 juillet 2020, par Mark Thompson

  kmsgrab : Use GetFB2 if available
  The most useful feature here is the ability to automatically extract the
  
  framebuffer format and modifiers.  It also makes support for multi-plane
  
  framebuffers possible, though none are added to the format table in this
  
  patch.
  This requires libdrm 2.4.101 (from April 2020) to build, so it includes a
  
  configure check to allow compatibility with existing distributions.  Even
  
  with libdrm support, it still won't do anything at runtime if you are
  
  running Linux < 5.7 (before June 2020).
  

  • [DH] configure
  • [DH] libavdevice/kmsgrab.c

• Converting FFMpeg Video to android playable video

  15 avril 2021, par Soham Samanta

  I had some image sequence and I used them to make a video using FFMpeg. It palyed well on VLC (windows and android) but not on built in android video player.
Codec and container info of the video is the following -

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../clg/clg_eq_final_injected.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
  Duration: 00:00:12.13, start: 0.000000, bitrate: 9058 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 4096x2048, 9057 kb/s, 24 fps, 24 tbr, 12288 tbn, 24576 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Side data:
      spherical: equirectangular (0.000000/0.000000/0.000000)


  


  I made a workaround by uploading the video on youtube. Then I downloaded it again. It's codec info is following -

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../clg/clg_eq_test.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2020-05-17T08:06:01.000000Z
  Duration: 00:00:12.14, start: 0.000000, bitrate: 738 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 607 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
    Metadata:
      creation_time   : 2020-05-17T08:06:01.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 05/17/2020.
    Side data:
      stereo3d: 2D
      spherical: equirectangular (0.000000/0.000000/0.000000)
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      creation_time   : 2020-05-17T08:06:01.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 05/17/2020.


  


  I noticed that the first video does not have any audio stream (since it's just an image sequence). But youtube arbitrarily added an audio stream. (I tried on android after adding an audio stream with it but no luck)
What I know -

  


  

  1. Android does not natively support motion JPEG.

  


  2. H264 is supported by android.

  


  


  Q1. What is the difference between h264(constrained baseline) vs h264(main) ?
Q2. Why the first video is not natively supported on android ?
My uploaded youtube video is here.

  


  Ref :

  


  Conversion from mjpeg to mp4 (libx264) with FFmpeg

  


  convert format from yuvj420p to yuv420p

  


  How to create a video from images with FFmpeg ?