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Sur d’autres sites (4819)

  • FFProbe as .NET Process gives error while command line does not

    13 février 2024, par Ron O

    I've got a sample mp4 (a copy can be found here [sample_tagged.mp4, 562KB]) I've tagged with metadata using FFMpeg. Using a command line, if I issue a general command to view the metadata, I get everything.

    


    > ffprobe.exe -hide_banner -loglevel error -show_entries 'format_tags' sample_tagged.mp4
[FORMAT]
TAG:minor_version=512
TAG:major_brand=isom
TAG:compatible_brands=isomiso2avc1mp41
TAG:IMDB=tt0012345
TAG:Title=Sample MP4
TAG:synopsis=Watch MP4 sample
TAG:Rating=3.30
TAG:TMDB=tv/12345
TAG:Subtitle=Samples for all!
TAG:year=2000
TAG:date=2000:01:01T00:00:00
TAG:ReleaseDate=2000:01:01
TAG:genre=Beach;Windy;Sample
TAG:encoder=Lavf60.3.100
[/FORMAT]


    


    Also using the command line, if I limit it to a specific tag, I only get the specific tag as expected.

    


    > ffprobe.exe -hide_banner -loglevel error -show_entries 'format_tags=TMDB' sample_tagged.mp4
[FORMAT]
TAG:TMDB=tv/12345
[/FORMAT]


    


    I've set up a C# Process (in LINQPad) to mimic this behavior and return the results as a collection of key/value pairs.

    


    async Task Main()
{
  var sample = await FFProbe.GetProperties("sample_tagged.mp4");
  sample.Dump("Sample");

  var targeted = await FFProbe.GetProperties("sample_tagged.mp4", "TMDB");
  targeted.Dump("Sample Targeted");
}

class FFProbe
{
  const string _exeName = @"ffprobe.exe";
  const string _arguments = @"-hide_banner -loglevel error -show_entries 'format_tags{0}' ""{1}""";

  static Encoding _Utf8NoBOM = new UTF8Encoding(false);

  public static async Task>> GetProperties(string filename, params string[] targetProperties)
  {
    using (var probe = new Process())
    {
      var propsRead = new List>();

      probe.EnableRaisingEvents = true;
      probe.OutputDataReceived += (object sender, DataReceivedEventArgs e) =>
      {
        e.Dump("Output");
        if (e?.Data is null)
          return;
        
        if (e.Data.StartsWith("TAG"))
        {
          var eq = e.Data.IndexOf('=');

          if (eq > 1)
          {
            var key = e.Data.Substring(4, eq - 4);
            var value = e.Data.Substring(eq + 1).Trim();

            if (!targetProperties.Any() || targetProperties.Any(tp => key.Equals(tp, StringComparison.InvariantCultureIgnoreCase)))
            {
              if (value.Contains("\\r\\n"))
                value = value.Replace("\\r\\n", Environment.NewLine);

              propsRead.Add(new KeyValuePair(key, value));
            }
          }
        }
      };
      probe.ErrorDataReceived += (object sender, DataReceivedEventArgs e) =>
      {
        e.Dump("Error");
        if (e?.Data is null)
          return;
      };

      probe.StartInfo.FileName = _exeName;
      
      var tagLimiter = string.Empty;
      
      if (targetProperties.Any())
        tagLimiter = $"={string.Join(',', targetProperties)}";
      
      var arguments = string.Format(_arguments, tagLimiter, filename);
      arguments.Dump();

      probe.StartInfo.Arguments = arguments;
      probe.StartInfo.UseShellExecute = false;
      probe.StartInfo.CreateNoWindow = true;
      probe.StartInfo.RedirectStandardOutput = true;
      probe.StartInfo.RedirectStandardError = true;
      probe.StartInfo.StandardOutputEncoding = _Utf8NoBOM;
      probe.StartInfo.StandardErrorEncoding = _Utf8NoBOM;

      probe.Start();
      probe.BeginOutputReadLine();
      probe.BeginErrorReadLine();
      
      await probe.WaitForExitAsync();

      return propsRead;
    }
  }
}


    


    The output for the full sample dump matches the full metadata list. But when getting the targeted tag, I get two error responses.

    


    No match for section 'format_tags=TMDB'
Failed to set value ''format_tags=TMDB'' for option 'show_entries': Invalid argument


    


    From the output, the arguments sent into the process match those of the command line above :

    


    -hide_banner -loglevel error -show_entries 'format_tags=TMDB' "sample_tagged.mp4"


    


    I've copy/pasted the generated arguments to the command line call and it returns the value expected.

    


    What am I missing and/or need correction in setting up the call to get the same results via a Process as the command line ?

    


  • Combining 97 items like jpg, png and mp4 using ffmpeg [closed]

    30 juin 2023, par nlp

    I have 3 mp4 videos with audio and 92 jpg images and 1 png image. I need merge all of them, since images dont have audio i have added dummy audio at the end.

    


    -f lavfi -t 0.1 -i anullsrc=channel_layout=stereo:sample_rate=44100


    


    I checked all mp4 video have 30 fps. But im getting error when i run this command in terminal. I have added error end of this question.

    


    


    ffmpeg -i vlog.mp4 -loop 1 -framerate 30 -t 10 -i
176289846_105097328309081_601023439308451104_n.jpg -loop 1 -framerate
30 -t 10 -i
2048x2730—elleuk-com-gallery-2543-k-launches-the-estee-edit-at-selfridges-london-rex-gallery-jpg.jpg
-loop 1 -framerate 30 -t 10 -i 240509456_951357192092578_7024031524462711198_n.jpg -loop 1 -framerate
30 -t 10 -i 269773026_139944861743460_5973031789377429736_n.jpg -loop
1 -framerate 30 -t 10 -i
272185356_5184945991539492_8655458649809306173_n.jpg -loop 1
-framerate 30 -t 10 -i 272982846_982963685973335_4505762263706805155_n.jpg -loop 1 -framerate
30 -t 10 -i 284894134_779193733247375_8179012576894655236_n.jpg -loop
1 -framerate 30 -t 10 -i
292010277_105616508829281_6546460775317951397_n.jpg -loop 1 -framerate
30 -t 10 -i 299579923_366974645463442_3067763790958680676_n.jpg -loop
1 -framerate 30 -t 10 -i
308586860_1460806071064928_724646131074541655_n.jpg -loop 1 -framerate
30 -t 10 -i 316251042_1182932825658575_1973331576384811644_n.jpg -loop
1 -framerate 30 -t 10 -i
317375204_825333288586225_3494327956540386564_n.jpg -loop 1 -framerate
30 -t 10 -i 320657986_171627788829176_6704693822753482970_n.jpg -i
336023902_1388216378646434_1274549774807386832_n1.mp4 -loop 1
-framerate 30 -t 10 -i 336023902_1388216378646434_1274549774807386832_n.jpg -loop 1
-framerate 30 -t 10 -i 337139845_175124041999226_2450227144918414731_n.jpg -loop 1 -framerate
30 -t 10 -i 341010813_1260501997880528_5775042343016088518_n.jpg -loop
1 -framerate 30 -t 10 -i
350350134_628274322245654_7834055219271640131_n.jpg -loop 1 -framerate
30 -t 10 -i bguk-1806442-001-1-1575885182.jpg -loop 1 -framerate 30 -t
10 -i gallery-1501231161-rexfeatures-8975296f.jpg -loop 1 -framerate
30 -t 10 -i gallery-1501490122-gettyimages-824543634.jpg -loop 1
-framerate 30 -t 10 -i gallery-1501662360-rexfeatures-8979657s.jpg -loop 1 -framerate 30 -t 10 -i gallery-1519118258-gettyimages-920660202.jpg -loop 1 -framerate 30 -t
10 -i gettyimages-1007594756-1-1533302417.jpg -loop 1 -framerate 30 -t
10 -i gettyimages-1041395230-1-1545137745.jpg -loop 1 -framerate 30 -t
10 -i gettyimages-1041507006.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1046789262.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1056952122.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-10597661501.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1059766150.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1061995120.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1068006128.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1071199786-1-1545137825.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1166095264.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1166462980.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1166619485.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1172717451.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1173046637.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1193584885.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1204872171.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1206702698.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1231869163.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1233125094.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1233143812.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1238147989.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1239252757.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1308337144.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1339403524.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1395051825.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1395099206.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1486931966-1-64506b1876fe3.jpg -loop 1 -framerate 30 -t 10
-i gettyimages-1497108210-6486cde03c9cb.jpg -loop 1 -framerate 30 -t 10 -i gettyimages-1661158508.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1663746244.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1667813271.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1667909592.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1668160883.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-1673863517.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-626934148.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-631291776.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-632556354.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-639891306.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-670606036.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-685410728.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-686201670.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-686442088.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-686480630.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-686749012.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-690994782.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-691692354.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-692007384.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-692204670.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-805671172.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-806281110.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-809176540.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-810594198.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-902346518.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-911129522.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-911331944.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-916007400.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-916331340.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-927557366-1523295081.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-942427832-1523295081.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-956246212-1532081998.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-956938402-1532081997.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-957678822-1532082000.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-957710836-1532081997.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-967568846-1532081998.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-969598422-1532081998.jpg -loop 1 -framerate 30 -t 10 -i
gettyimages-973460626-1532081998.jpg -loop 1 -framerate 30 -t 10 -i
k-style-file-1642411215.jpg -loop 1 -framerate 30 -t 10 -i
k-style-file-643d14ad02791.png -loop 1 -framerate 30 -t 10 -i
k-stylefile-july2016-2.jpg -loop 1 -framerate 30 -t 10 -i
k-wears-bottega-veneta-2-1669215583.jpg -i
app_video_308468950_1515994365517349_3800958547012720966_n.mp4 -f
lavfi -t 0.1 -i anullsrc=channel_layout=stereo:sample_rate=44100
-filter_complex "[0:v][0:a][1:v][96:a][2:v][96:a][3:v][96:a][4:v][96:a][5:v][96:a][6:v][96:a][7:v][96:a][8:v][96:a][9:v][96:a][10:v][96:a][11:v][96:a][12:v][96:a][13:v][96:a][14:v][14:a][15:v][96:a][16:v][96:a][17:v][96:a][18:v][96:a][19:v][96:a][20:v][96:a][21:v][96:a][22:v][96:a][23:v][96:a][24:v][96:a][25:v][96:a][26:v][96:a][27:v][96:a][28:v][96:a][29:v][96:a][30:v][96:a][31:v][96:a][32:v][96:a][33:v][96:a][34:v][96:a][35:v][96:a][36:v][96:a][37:v][96:a][38:v][96:a][39:v][96:a][40:v][96:a][41:v][96:a][42:v][96:a][43:v][96:a][44:v][96:a][45:v][96:a][46:v][96:a][47:v][96:a][48:v][96:a][49:v][96:a][50:v][96:a][51:v][96:a][52:v][96:a][53:v][96:a][54:v][96:a][55:v][96:a][56:v][96:a][57:v][96:a][58:v][96:a][59:v][96:a][60:v][96:a][61:v][96:a][62:v][96:a][63:v][96:a][64:v][96:a][65:v][96:a][66:v][96:a][67:v][96:a][68:v][96:a][69:v][96:a][70:v][96:a][71:v][96:a][72:v][96:a][73:v][96:a][74:v][96:a][75:v][96:a][76:v][96:a][77:v][96:a][78:v][96:a][79:v][96:a][80:v][96:a][81:v][96:a][82:v][96:a][83:v][96:a][84:v][96:a][85:v][96:a][86:v][96:a][87:v][96:a][88:v][96:a][89:v][96:a][90:v][96:a][91:v][96:a][92:v][96:a][93:v][96:a][94:v][96:a][95:v][95:a]concat=n=96:v=3:a=3"
out.mp4

    


    


    Error :

    


    


    Input #95, mov,mp4,m4a,3gp,3g2,mj2, from
'app_video_308468950_1515994365517349_3800958547012720966_n.mp4' :
    
Metadata :
major_brand : isom
minor_version : 512
compatible_brands : isomiso2avc1mp41 Duration : 00:00:07.15, start : 0.000000, bitrate : 1707 kb/s
Stream #95:0(und) : Video : h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 576x720, 1614 kb/s, 30 fps, 30 tbr, 15360 tbn, 60
tbc (default)
Metadata :
handler_name : VideoHandler
Stream #95:1(und) : Audio : aac (HE-AAC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 112 kb/s (default)
Metadata :
handler_name : SoundHandler Input #96, lavfi, from 'anullsrc=channel_layout=stereo:sample_rate=44100' : Duration : N/A,
start : 0.000000, bitrate : 705 kb/s
Stream #96:0 : Audio : pcm_u8, 44100 Hz, stereo, u8, 705 kb/s Stream specifier ':a' in filtergraph description
[0:v][0:a][1:v][96:a][2:v][96:a][3:v][96:a][4:v][96:a][5:v][96:a][6:v][96:a][7:v][96:a][8:v][96:a][9:v][96:a][10:v][96:a][11:v][96:a][12:v][96:a][13:v][96:a][14:v][14:a][15:v][96:a][16:v][96:a][17:v][96:a][18:v][96:a][19:v][96:a][20:v][96:a][21:v][96:a][22:v][96:a][23:v][96:a][24:v][96:a][25:v][96:a][26:v][96:a][27:v][96:a][28:v][96:a][29:v][96:a][30:v][96:a][31:v][96:a][32:v][96:a][33:v][96:a][34:v][96:a][35:v][96:a][36:v][96:a][37:v][96:a][38:v][96:a][39:v][96:a][40:v][96:a][41:v][96:a][42:v][96:a][43:v][96:a][44:v][96:a][45:v][96:a][46:v][96:a][47:v][96:a][48:v][96:a][49:v][96:a][50:v][96:a][51:v][96:a][52:v][96:a][53:v][96:a][54:v][96:a][55:v][96:a][56:v][96:a][57:v][96:a][58:v][96:a][59:v][96:a][60:v][96:a][61:v][96:a][62:v][96:a][63:v][96:a][64:v][96:a][65:v][96:a][66:v][96:a][67:v][96:a][68:v][96:a][69:v][96:a][70:v][96:a][71:v][96:a][72:v][96:a][73:v][96:a][74:v][96:a][75:v][96:a][76:v][96:a][77:v][96:a][78:v][96:a][79:v][96:a][80:v][96:a][81:v][96:a][82:v][96:a][83:v][96:a][84:v][96:a][85:v][96:a][86:v][96:a][87:v][96:a][88:v][96:a][89:v][96:a][90:v][96:a][91:v][96:a][92:v][96:a][93:v][96:a][94:v][96:a][95:v][95:a]concat=n=96:v=3:a=3
matches no streams.

    


    


  • How to Match ASS Subtitle Font Size with Flutter Text Size for a 1080p Video ?

    16 décembre 2024, par Mostafa Fathi

    I’m working on a project where I need to synchronize the font size of ASS subtitles with the text size a user sees in a Flutter application. The goal is to ensure that the text size in a 1080p video matches what the user sees in the app.

    


    What I've Tried :

    


      

    1. Calculating font size using height ratio (PlayResY/DeviceHeight) :

      2. 


    


      

    • I used the formula :

      • 


    


    FontSize_ASS = FontSize_Flutter * (PlayResY / DeviceHeight)


    


      

    • While the result seemed logical, the final output in the video was smaller than expected.

      • 


    


      

    1. Adding a scaling factor :

      2. 


    


      

    • I introduced a scaling factor (around 3.0) to address the size discrepancy.

      • 


    • This improved the result but still felt inconsistent and lacked precision.

      • 


    


      

    1. Using force_style in FFmpeg :

      2. 


    


      

    • I applied the force_style parameter to control the font size in FFmpeg directly.

      • 


    


    ffmpeg -i input.mp4 -vf "subtitles=subtitle.ass:force_style='FontSize=90'" -c:a copy output.mp4


    


      

    • While it produced better results, it’s not an ideal solution as it bypasses the calculations in the ASS file.

      • 


    


      

    1. Aligning PlayResX and PlayResY in the ASS file :
I ensured that these parameters matched the target video resolution (1920×1080) :

      2. 


    


    PlayResX: 1920
PlayResY: 1080


    


      

    • Despite this adjustment, the font size didn’t align perfectly with the Flutter app text size.

      • 


    


      

    1. Reading font metrics from the font file dynamically :
To improve precision, I wrote a function in Flutter that reads font metrics (units per EM, ascender, and descender) from the TTF font file and calculates a more accurate scaling factor :

      2. 


    


    Future readFontMetrics(
      String fontFilePath, 
      double originalFontSize,
) async {
  final fontData = await File(fontFilePath).readAsBytes();
  final fontBytes = fontData.buffer.asUint8List();
  final byteData = ByteData.sublistView(fontBytes);

  int numTables = readUInt16BE(byteData, 4);
  int offsetTableStart = 12;
  Map> tables = {};

  for (int i = 0; i < numTables; i++) {
    int recordOffset = offsetTableStart + i * 16;
    String tag =
        utf8.decode(fontBytes.sublist(recordOffset, recordOffset          + 4));
    int offset = readUInt32BE(byteData, recordOffset + 8);
    int length = readUInt32BE(byteData, recordOffset + 12);

    tables[tag] = {
      'offset': offset,
      'length': length,
    };
  }

  if (!tables.containsKey('head') || !tables.containsKey('hhea'){
    print('Required tables not found in the font file.');
    return null;
  }

  int headOffset = tables['head']!['offset']!;
  int unitsPerEm = readUInt16BE(byteData, headOffset + 18);

  int hheaOffset = tables['hhea']!['offset']!;
  int ascender = readInt16BE(byteData, hheaOffset + 4);
  int descender = readInt16BE(byteData, hheaOffset + 6);

  print('unitsPerEm: $unitsPerEm');
  print('ascender: $ascender');
  print('descender: $descender');

  int nominalSize = unitsPerEm;
  int realDimensionSize = ascender - descender;
  double scaleFactor = realDimensionSize / nominalSize;
  double realFontSize = originalFontSize * scaleFactor;

  print('Scale Factor: $scaleFactor');
  print('Real Font Size: $realFontSize');

  return realFontSize;
}


    


      

    • This function dynamically reads the font properties (ascender, descender, and unitsPerEM) and calculates a scale factor to get the real font size. Despite this effort, discrepancies persist when mapping it to the ASS font size.

      • 


    


    Question :
How can I ensure that the font size in the ASS file accurately reflects the size the user sees in Flutter ? Is there a reliable method to calculate or align the sizes correctly across both systems ? Any insights or suggestions would be greatly appreciated.

    


    Thank you ! 🙏

    


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