Recherche avancée

Sur d’autres sites (5767)

• Adding subtitles with FFMpegCore in C# is not working on Azure Function

  1er février 2024, par Skerdi Berberi

  I have deployed a C# azure function with ffmpeg.exe (using FFMpegCore nuget). The function adds audio and srt/ass subtitles to a video.
When I test locally this code works (running on azurite). But, when I deploy the azure function, the audio is added to the video but the subtitles don't show up.

  


  At the begining I thought it was an issue with the Fonts because I was using ASS File for subtitles but then I switched to SRT and still is not working.

  


  I've tried with both SRT and ASS but they both don't work using this code :

  


  await FFMpegArguments
 .FromFileInput(videoInputPath, true, options =>
 {
     options.WithCustomArgument("-stream_loop -1");
 })
 .AddFileInput(audioPath, true)
 .OutputToFile(videoOutputPath, true, (options) =>
 {
     options.WithDuration(thread.AudioData.TotalAudioDuration);

     options.WithVideoCodec(VideoCodec.LibX264);   // Re-encode video using x264 codec
     options.WithAudioCodec(AudioCodec.Aac);       // Re-encode audio to AAC
     options.WithSpeedPreset(Speed.VeryFast);
     options.UsingShortest(true);

     options.WithVideoFilters((videoOptions) =>
     {
         videoOptions.HardBurnSubtitle(SubtitleHardBurnOptions.Create(subtitlesFile));
     });
 }).ProcessAsynchronously();


  


  Here's the command it creates on Azure function :

  


  ffmpeg -stream_loop -1 -i "C:\local\Temp\videoTempPath.mp4" -i "C:\local\Temp\audioTempPath.mp3" -t 00:00:22.8160000 -c:v libx264 -c:a aac -preset veryfast -shortest -vf "subtitles='C\:\\local\\Temp\\subtitles.srt'" "C:\local\Temp\output.mp4" -y


  


• I have 22,1 GB of movie data totally that I want to put on several DVDs

  8 mars 2017, par P. Dee

  I have 22,1 GB of movie data totally that I want to put on several DVDs.

  I want ffmpeg to create one long 22.1 GB mp4 file from a lot of small files to then split them into as many 4.7 GB mp4-files as necessary(should fit on 5 DVDs), so the order is preserved.

  Which command do I need ?

  I started with ffmpeg -f concat -safe 0 -i mylist.txt -c copy -fs 5046586573 output1.mp4 with mylist.txt containing

  # this is a comment
  
  file '/path/to/file1'
  
  file '/path/to/file2'
  
  file '/path/to/file3'

  Then looking at the duration, to then continue with ffmpeg -ss duration -f concat -safe 0 -i mylist.txt -c copy -fs 5046586573 output2.mp4

  Which command does that at once ?

• Font Size Mismatch When Using Fallback Fonts in FFmpeg ASS Subtitles

  6 janvier, par Mostafa Fathi

  I’m facing an issue with font size mismatch in ASS subtitles rendered by FFmpeg when combining English text with Arabic or Persian characters.

  


  Steps to Reproduce :

  


  1.Subtitle File :
Here’s an example of the ASS subtitle file :

  


  [Script Info]
Title: Generated ASS
ScriptType: v4.00+
WrapStyle: 2
ScaledBorderAndShadow: yes
YCbCr Matrix: none
PlayResX: 1920
PlayResY: 1080

[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, ABeeZee, 40, &H00FFFFFF, &H000000FF, &H00000000, &H00000000, -1, 0, 0, 0, 100, 100, 0, 0, 1, 1, 0, 2, 10, 10, 10, 1

[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:01.00,0:00:05.00,Default,,0,0,0,,Hello! This is English text.
Dialogue: 0,0:00:05.00,0:00:10.00,Default,,0,0,0,,سلام! This is mixed Arabic/English text.


  


  

  2. Command Used :

  


  


  ffmpeg -i input.mp4 -vf "ass=subtitle.ass" output.mp4


  


  

  3. Screenshots :
Below are two screenshots of the issue :

  


  


  • Text rendered with the main font (ABeeZee) is correct.

  


  

  


  • Text rendered with the fallback font (Cinema) appears larger/smaller in size.

  


  

  


  

  5. Debug Logs :

  


  


  [Parsed_ass_0 @ 0xb4000079f04f8210] libass API version: 0x1701000
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] libass source: commit: 0.17.1-0-ge8ad72accd3a84268275a9385beb701c9284e5b3
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] Shaper: FriBidi 1.0.13 (SIMPLE) HarfBuzz-ng 8.0.1 (COMPLEX)
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] Using font provider fontconfig
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] Added subtitle file: '/data/***/ass_file.ass' (4 styles, 29 events)
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] fontselect: (ABeeZee, 400, 0) -> /data/***/ABeeZee_regular.ttf, 0, ABeeZee-Regular
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] Glyph 0x633 not found, selecting one more font for (ABeeZee, 400, 0)
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] fontselect: (ABeeZee, 400, 0) -> /data/***/Cinema.ttf, 0, Cinema


  


  Question :

  


  How can I ensure that text rendered with fallback fonts has the same size as the main font ? Are there specific settings in FFmpeg or the ASS subtitle format that can address this issue ? Alternatively, is there a way to manually adjust the scaling of fallback fonts in FFmpeg ?