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• Best practice to play segments of larger video files in HTML5 video format

  8 octobre 2015, par zx98

  I have to migrate a legacy project from Windows Media to HTML5 video/audio. The system should provide video/audio content to the web user meeting following criteria :

  1. Playout : Segments (TcIn to TcOut) of large video/audio files should be played "on the fly" to the web user. (Cutting the source material into segments does not work because there is a high overlap rate between segments, so 3-4 times more HDD space and a lot of extra programming would be needed. Markered playout of the large source files is not an option either as there are forbidden parts of the source material which should never be available to the user).
  2. Cutting : In general, users are permitted to make copies of the material. Indeed, by using the dowload function, users can download selected segments. I guess, this is not a problem : a service starts a cutting software (probably ffmpeg) that cuts the video, and the user is notified by email to download the product. (That’s the way I do it now but there might be a more simple option).
  3. Formats : what is the preferred video/audio format that most browsers (Chrome, Firefox, Opera, Android) support ?
  4. Server : If possible, I would keep Windows Server because the database behind is MS SQL Server.

  (Windows Media Server and WMEncoder currently works fine for all the above, however WM is not suppored by browsers any more. That is the reason for reengineering).

  I would appreciate any of your suggestions on how to rebuild this video/audio system. (What software elements to use and how).

  Thank you.

  -------- addition -------
  Dear commenters,
  Thank you for your comments. Please note that the above is one single question, the rest is just a detailed description of the issue/conditions, as recommended by stackoverflow.com. I guess, the answer is also very simple, I try to write it myself :

  1. You should keep the large video/audio files in xxx format because...
  2. You create a playlist file like this example... for each of the the segments.
  3. You install the xxx streaming software component on the web/media server to playout the segments.
  4. You can address and play the segments from the client side web browser like this :...
  5. For asynchronous cutting, yes, I recommend ffmpeg, try these profile settings.

  Just a few parts in bold are missing. Thanks to anyone who can fill them.

• No such filter : 'drawtext'

  29 décembre 2020, par Femzy

  My main objective is to collect user inputs and convert it to a video with black background, then the input text will be moving from left to right while the video is playing with audio in the background.

  



  Currently I was suggested to use "drawtext" but i have not find it working.

  



  My command :

  



  ffmpeg -i test.mp4 -vf "drawtext=fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSerif-Bold.ttf:textfile=text.txt:reload=1:y=h-line_h-10:x=(W/tw)*n" textover7.mpg -report
ffmpeg version git-2017-12-28-be4dfbf Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-18)
  configuration: --prefix=/usr/local/ffmpeg --extra-cflags=-I/usr/local/ffmpeg/include --extra-ldflags=-L/usr/local/ffmpeg/lib --bindir=/usr/local/bin --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libx264 --enable-libtheora --enable-filter=drawtext
  libavutil      56.  7.100 / 56.  7.100
  libavcodec     58.  9.100 / 58.  9.100
  libavformat    58.  3.100 / 58.  3.100
  libavdevice    58.  0.100 / 58.  0.100
  libavfilter     7.  8.100 /  7.  8.100
  libswscale      5.  0.101 /  5.  0.101
  libswresample   3.  0.101 /  3.  0.101
  libpostproc    55.  0.100 / 55.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2014-01-19T03:12:30.000000Z
  Duration: 00:07:15.00, start: 0.000000, bitrate: 201 kb/s
    Stream #0:0(und), 8, 1/30: Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x360, 103 kb/s, 15 fps, 15 tbr, 30 tbn, 30 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und), 1, 1/44100: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96 kb/s (default)
    Metadata:
      creation_time   : 2014-01-19T03:12:31.000000Z
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mpeg1video (native))
  Stream #0:1 -> #0:1 (aac (native) -> mp2 (native))
Press [q] to stop, [?] for help
[AVFilterGraph @ 0x466e4c0] No such filter: 'drawtext'
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!


  


• ffmpeg incorrect border width of ass subtitles

  7 avril 2021, par Tac

  This is what i met when burning the subtitle to the video.

  



  Here is the ass code, I have to use 640x360 in resolution :

  



  [Script Info]
; Script generated by Aegisub 3.2.2
; http://www.aegisub.org/
Title: Default Aegisub file
ScriptType: v4.00+
WrapStyle: 0
YCbCr Matrix: None
PlayResX: 640
PlayResY: 360

[Aegisub Project Garbage]
Last Style Storage: Default
Scroll Position: 154
Active Line: 172
Video Position: 10429

[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default,Arial,45,&H00FFFFFF,&H000000FF,&H00FF0000,&H00000000,0,0,0,0,100,100,0,0,1,5.125,3.125,2,28,28,16,1

[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.94,0:05:12.11,*Default,NTP,0,0,0,,the quick brown dog jumps over the lazy fox.


  



  I usually use MeGUI on Windows (with avs script) to burn. Here is the avs code :

  



  DirectShowSource("C:\Users\xxx\Downloads\test.mp4", fps=25.000, audio=false, convertfps=true).AssumeFPS(25,1)
#deinterlace
#crop
#resize
#denoise

LoadPlugin("C:\Users\xxx\Desktop\megui\tools\avisynth_plugin\VSFilter.dll")
TextSub("C:\Users\xxx\Desktop\ass.ass", 1)

ConvertToYV12()


  



  The subtitle after burning looks like this :

  



  On Windows

  



  

  



  However, it is unable to use MeGui on Linux. Thus I used ffmpeg. The command I used is like this :

  



  ffmpeg -i test.mp4 -vf ass=ass.ass -crf 25 -an -f mp4 done.mp4
ffmpeg -i test.mp4 -vf ass=ass.ass:original_size=640x360 -crf 25 -an -f mp4 done.mp4
ffmpeg -i test.mp4 -vf ass=ass.ass:original_size=1920x1080 -crf 25 -an -f mp4 done.mp4
ffmpeg -i test.mp4 -vf subtitles=ass.ass -crf 25 -an -f mp4 done.mp4
ffmpeg -i test.mp4 -vf subtitles=ass.ass:original_size=640x360 -crf 25 -an -f mp4 done.mp4
ffmpeg -i test.mp4 -vf subtitles=ass.ass:original_size=1920x1080 -crf 25 -an -f mp4 done.mp4


  



  However, they all looks like this

  



  Subtitle on Linux

  



  

  



  The effect on windows is what I want. How can i get the effect like that on Linux ? Thanks !