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• 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>

  


• How to add an arbitrary, formatted timestamp to a video with FFMPEG ? [duplicate]

  23 avril 2018, par Neil M.

  This question already has an answer here :

  • Can ffmpeg burn in time code ?
    
    7 answers
    

  I am calling ffmpeg from a custom tool to concatenate video files while overlaying a timestamp in the output. The output video needs to have a timestamp starting at an arbitrary time. The format must be a 12-hour clock with seconds and meridiem, e.g. 10:34:59 AM or 6:13:09 PM. Here’s the full command I’m using right now :

  ffmpeg\bin\ffmpeg.exe -y -i "concat:input.mod" -ss 00:00:00 -t 00:02:17 
  
  -an -vcodec libx264 -profile:v baseline -level 13 -b:v 2000k -vf 
  
   "drawtext=fontcolor=white:fontsize=16:fontfile="/Windows/Fonts/arial.ttf":
  
  box=1:boxcolor=black@0.3:x=(w-text_w-10):y=(h-text_h-5):
  
  timecode='02\:36\:17\;00':rate=30000/1001" output.mp4

  This outputs a 2 minute, 17 second duration video beginning at the start of the input file. The output video has a timecode in the bottom-right corner beginning at the time 02:36:17 and ending at 02:38:34. What I want is exactly this, but instead of printing "02:36:17 ;00" on frame 0 and counting up from there, it should print "2:36:17 AM" on frame 0 and count up from there.

  I have tried using the localtime function to output formatted time, but the time value it uses is the time that the drawtext filter is called. It doesn’t take a parameter for an arbitrary time.

  I have also looked at the pts function, which seems to allow an arbitrary offset but only supports two formatting options, neither of which is the clock format I need.

  What is the proper way to add a timestamp with an arbitrary starting time and format using ffmpeg ?

• How to display progress on user side in FFMPEG transcoding in rails ?

  21 décembre 2015, par Jiggs

  I am using Streamio-ffmpeg to process files. The gem shows the progress of the transcoding in the console. I want to display this progress to the user. Is there anyway of doing this ?

  This is my lib : (Where the transcoding is done)

  file = ::FFMPEG::Movie.new(tmpfile)
  
  
  
  encoded_file = File.join(directory, new_name)
  
  
  
  file.transcode(encoded_file) { |progress| progressing = (progress * 100).round(2); puts "#{progressing} %"; }

  The |progress| progressing = (progress * 100).round(2) ; puts "#progressing %" ; is responsible for printing the progress to the console. Can I display this in my views instead ?

  Output on console is :-

  I, [2015-12-21T12:48:55.322814 #19642]  INFO -- : Running transcoding...
  
  ffmpeg -y -i /home/tps/sites/demo_projects/blog/public/uploads/tmp/1450682335-19642-6992/tmpfile  /home/tps/sites/demo_projects/blog/public/uploads/tmp/1450682335-19642-6992/mp4_SampleVideo_1080x720_5mb.mp4
  
  
  
  0.0 %
  
  
  
  6.63 %
  
  
  
  9.57 %
  
  
  
  11.4 %
  
  
  
  13.46 %
  
  
  
  15.86 %
  
  
  
  18.3 %
  
  
  
  21.64 %
  
  
  
  25.03 %
  
  
  
  28.61 %
  
  
  
  32.09 %
  
  
  
  36.62 %
  
  
  
  43.29 %
  
  
  
  48.6 %
  
  
  
  53.23 %
  
  
  
  57.69 %
  
  
  
  61.68 %
  
  
  
  66.49 %
  
  
  
  70.1 %
  
  
  
  72.91 %
  
  
  
  75.75 %
  
  
  
  79.07 %
  
  
  
  83.73 %
  
  
  
  88.81 %
  
  
  
  93.07 %
  
  
  
  96.72 %
  
  
  
  99.05 %
  
  
  
  99.97 %
  
  
  
  100.0 %
  
  
  
  I, [2015-12-21T12:49:10.058592 #19642]  INFO -- : Transcoding of /home/tps/sites/demo_projects/blog/public/uploads/tmp/1450682335-19642-6992/tmpfile to /home/tps/sites/demo_projects/blog/public/uploads/tmp/1450682335-19642-6992/mp4_SampleVideo_1080x720_5mb.mp4 succeeded

  I tried out "using include ActionController::Live" but i don’t get any proper result. I don’t know to how to use "include ActionController::Live" in this situation.