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• 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 !

  


• How to set profile compatibility and level indication of an fMP4 using ffmpeg ?

  27 novembre 2014, par Pablo Montilla

  I’m using ffmpeg to generate a fragmented mp4 stream that will be consumed by an HTML5 player using MSE. I think I have a correctly formatted mp4 stream of data with an empty moov at the start and a series of moof+mdat for the video fragments. What I’m stuck is with the codec that’s being received by Chrome.

  chrome ://media-internals has this to say :

  00:00:00 00 pipeline_state  kCreated
  
  00:00:00 00 EVENT           PIPELINE_CREATED
  
  00:00:00 00 EVENT           WEBMEDIAPLAYER_CREATED
  
  00:00:00 00 url             blob:http%3A//localhost/3388b7f1-5567-4d76-a585-0b247affd16a
  
  00:00:00 00 pipeline_state  kInitDemuxer
  
  00:00:07 68 error           Video codec: avc1.4d401e

  From which I gather the problem is with the encoded data, which should be in avc1.4d0020 as its specified in the javascript.

  I’ve seen the answer to html5 video tag codecs attribute, which tells me I need to reset profile_compatibility and AVCLevelIndication, but I couldn’t find an option to do that.

  Here’s the command line I’m using (the pipe is read and sent to the web page using web sockets) :

  ffmpeg -re -i Input.mp4 -map 0:0 -y -c:v libx264 -preset veryslow -x264opts intra-refresh=1 -tune psnr -refs 1 -b:v 1500k -bf 0 -g 8 -b-pyramid none -f mp4 -movflags empty_moov+omit_tfhd_offset+frag_keyframe -frag_duration 1000000 -profile:v main -iods_video_profile 0 -flags +loop \\.\pipe\FeedPipe

  So the question is, can I set the profile_compatiblity and AVCLevelIndictation in the ffmpeg command line ?

• avcodec/nvenc : Fix profile parameter handling

  2 avril 2015, par Timo Rothenpieler

  avcodec/nvenc : Fix profile parameter handling
  It was not possible to set a profile before, the builtin profile
  
  parameter does not seem to work propperly.
  
  To be compatible with libx264, this overlays it with a local parameter
  
  that expects a string, instead of an int, that takes the well known values
  
  "high", "main" or "baseline".
  Reviewed-by : Philip Langdale <philipl@overt.org>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/nvenc.c