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• ffmpeg - embed metadata that updates regularly in video

  11 juillet 2018, par ketil

  I have a video that was recorded with an ROV, or an underwater drone if you will. There video is stored in raw H.264, and lots of data is logged during a dive, like temperature, depth, pitch/roll/yaw, etc. Each log entry is timestamped with seconds since epoch.

  Copying the raw H264 into an mp4 container at the correct framerate is easy, but I’d like to create a video that displays some or all of the metadata. I’d like to automate the process, so that I can come back from a trip and run a conversion batch tool that applies the metadata from new dives into the new video recordings. I’m hoping to avoid manual steps.

  What are my options to display details on the video ? Displaying text on the video is a common thing to do, but it isn’t as clear to me how I could update it every few seconds based on an epoch timestamp from the logs. If I use -vf and try to use frame ranges for when to display each value, that’ll be a very long filter. Would it help somehow if I generate an overlay video first ? I don’t see how that will be much easier, though.

  Examples of some of the details I am hoping to embed are :

  • depth
  • temperature
  • pitch, roll and yaw, perhaps by using "sprites" that can be rotated based on the logged rotation around each axis

  Here’s a small sample of some of the logged data :

  1531168847.588000000 depth: 5.7318845
  
  1531168848.229000000 attitude.calc.roll: -178.67145730705903
  
  1531168848.229000000 attitude.calc.pitch: 8.89832326120461
  
  1531168848.598000000 pressure.fluid_pressure_: 1598.800048828125
  
  1531168848.898000000 temp.water.temperature.temperature_: 13.180000305175781
  
  1531168849.229000000 attitude.calc.roll: -177.03372656909875
  
  1531168849.229000000 attitude.calc.pitch: 3.697970708364904
  
  1531168849.605000000 pressure.fluid_pressure_: 1594.0999755859375
  
  1531168850.235000000 attitude.calc.yaw: 19.87041354690573
  
  1531168850.666000000 pressure.fluid_pressure_: 1593.300048828125

  The various values are logged at fairly irregular intervals, and they are not all updated at the same time.

  I can massage the data into any necessary format. I also have a timestamp (epoch based) of when each recording started, so I can calculate approximate frame numbers as necessary. I have been searching for ways to apply the epoch timestamp to the video (PTS, RTCTIME/RTCSTART), without luck so far. If I manage that, I imagine use of the enable filter might be easier, but I’m still not sure very very long video filters are the way to go.

• PHP-FFMPEG On Progress doesn't display until process is finished when encoding a video

  10 août 2022, par Ryan D

  Im running PHP-FFmpeg to encode videos which works great.

  


  https://github.com/PHP-FFMpeg/PHP-FFMpeg


  


  Using their example to get the current progress

  


  $ffmpeg = FFMpeg\FFMpeg::create();
$video = $ffmpeg->open('test.mp4');

$format = new FFMpeg\Format\Video\X264();
$format->on('progress', function ($video, $format, $percentage) {
    echo "$percentage % transcoded";
});

$video->save($format, 'encoded.mp4');


  


  The issue is the progress percentage doesn't display until the encoding is finished which doesn't really help out much. Id like to get the current percentage of encoding as it goes. Im just running this PHP file standalone, maybe I need to do an AJAX call or something to return the data ?

  


• FFMPEG Keyframes Exception

  3 avril 2017, par newToRacket

  I was hoping someone could help me, when pulling keyframes from a .mp4 file using FFMPEG in python I get this error :

       C:\Python27\python.exe "C:/Coll. Detection/UAS_Detection/GUI.py"
  
  in GUI main
  
  ('filePath', PyQt4.QtCore.QString(u'C:\\Users\\Razor\\Downloads\\video_test_512kb.mp4'), '\n')
  
  File Path -> C:\Users\Razor\Downloads\video_test_512kb.mp4
  
  SingleDetect C:\Users\Razor\Downloads\video_test_512kb.mp4
  
  ffmpeg version N-84679-gd65b595 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 51.100 / 55. 51.100
  
    libavcodec     57. 86.103 / 57. 86.103
  
    libavformat    57. 67.100 / 57. 67.100
  
    libavdevice    57.  3.101 / 57.  3.101
  
    libavfilter     6. 78.100 /  6. 78.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\Razor\Downloads\video_test_512kb.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: mp41
  
      creation_time   : 1970-01-01T00:00:00.000000Z
  
      title           : test file mp4 - http://www.archive.org/details/Pbtestfilemp4videotestmp4
  
      encoder         : Lavf51.10.0
  
      comment         : license:  http://creativecommons.org/licenses/by-nc-sa/2.5/
  
    Duration: 00:00:16.27, start: 0.000000, bitrate: 562 kb/s
  
      Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 512 kb/s, 15 fps, 15 tbr, 15 tbn, 30 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 45 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0000000003500e00] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, image2, to 'tmp/%d.jpeg':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: mp41
  
      comment         : license:  http://creativecommons.org/licenses/by-nc-sa/2.5/
  
      title           : test file mp4 - http://www.archive.org/details/Pbtestfilemp4videotestmp4
  
      encoder         : Lavf57.67.100
  
      Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 15 fps, 15 tbn, 15 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : VideoHandler
  
        encoder         : Lavc57.86.103 mjpeg
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  2017-04-02 18:36:07.832000
  
  Traceback (most recent call last):
  
    File "Detection.py", line 59, in <module>
  
      draw_detections(frame, found)
  
    File "Detection.py", line 32, in draw_detections
  
      result = Result.objects.create(picture=img, x=x, y=y, w=w, h=h)
  
  AttributeError: type object 'Result' has no attribute 'objects'
  
  frame=   21 fps=0.0 q=19.3 Lsize=N/A time=00:00:16.06 bitrate=N/A speed= 191x    
  
  video:160kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  
  
  Process finished with exit code 0
  
  </module>

  I’m trying to run these keyframes through an opencv human shape recognition api. It saves close to 300 keyframes to the folder I specified but for some reason the program just hangs afterwords instead of running the open cv hogger api on the newly saved keyframes. Will post script if it will help. Thank you for any help you can provide !!!