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• How does wrap_unicode option work when ffmpeg renders subtitles

  12 septembre 2024, par Bazinga

  This is my complete command, which accepts the wrap_unicode option, but the option is not working

  


  '/usr/local/ffmpeg/bin/ffmpeg' '-y' '-i' 'input.mp4' '-threads' '12' '-vcodec' 'libx264' '-acodec' 'aac' '-b:v' '1000k' '-refs' '6' '-coder' '1' '-sc_threshold' '40' '-flags' '+loop' '-me_range' '16' '-subq' '7' '-i_qfactor' '0.71' '-qcomp' '0.6' '-qdiff' '4' '-trellis' '1' '-b:a' '128k' '-vf' '[in]subtitles=test.srt:wrap_unicode=1:force_style='\''FontSize=12,FontName=Angsana New,PrimaryColour=&H00FFFFFF,BorderStyle=1,Outline=0.5,Shadow=1,MarginV=50'\''[out]' '-pass' '1' '-passlogfile' '/var/folders/xh/0xpfqmh57hb12ffvs5wy1v0w0000gn/T/ffmpeg-passes66e24b16ea0aa/pass-66e24b16ea47b' 'output.mp4'


  


  Before that, I compiled libunibreak, libass(0.17.0) in order, and reinstalled ffmpeg.

  


  I hope someone can help me understand where the problem caused this option to not take effect, this problem has been bothering me for some time, thank you very much !

  


• Why do I use the header file/library + ffplay.c download from the official website of ffmpeg to make the player worse than the official ffplay ?

  15 juillet 2020, par fredirty2017
  


  1. I am use win10 system with a "http_url_mp4" in hand, the MIME of this file is :
video/mp4 ; codecs="mp4a.40.2,avc1.640020" ; profiles="isom,mp41,mp42".

     


  


  2. I downloaded the header files, libraries, dlls, source code from https://ffmpeg.zeranoe.com/builds/ ,then :

     


  


  3. Run offical "ffplay http_url_mp4", audio and video viewing is normal ;

     


  


  4. I used VS2017 (the project has no special settings) to compile and link the fftools/ffplay.c，fftools/cmdutil.c and the included header files(libavcodec/libavutil and so on), libraries(such as avcodec.lib, avdevicelib, etc.), dlls(avcodec-58.dll / avformat-58.dll...), then run "myffplay http_url_mp4", The playback is stuttering, debugging found av_read_frame relative The processing cost more time, the calling frequency will be lower.

     


  


  5. i found config.h only line '#define FFMPEG_CONFIGURATION "—enable-gpl"', but offical ffplay cmdline shows :
'—disable-static —enable-shared —enable-gpl —enable-version3 —enable-cuda —enable-cuvid —enable-d3d11va —enable-dxva2 —enable-libmfx —enable-nvenc —enable-avisynth —enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libfreetype —enable-libgme —enable-libgsm —enable-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenh264 —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzimg —enable-lzma —enable-zlib',

     


  


  6. Does the VS project need special settings or other codes ?

     


  


  


• How to get video format from video URL (Any type, not just AVPlayer compatible)

  18 novembre 2022, par Bruno Pantaleão

  I want to get the format from a video URL (mp4, m3u8, mpeg etc...) to decided which player to use in my app (AVPlayer or third party).

  


  One option is to check if AVAsset(...).isPlayable, Im using this right now, but I want to improve my logic for when the AVPlayer can't be used.

  


  When I can't use AVPlayer then I encode the video using ffmpeg, if I could have the format of the video (and maybe even more information) I could improve the encode done by ffmpeg.