Sur d’autres sites (5896)

• FFmpeg library in WPF

  20 avril 2022, par MikeTMG

  I am building a softwere that can decode and encode using Wpf and c#, and I want to do that using, FFmpeg libary. I saw the ffmpeg autogen warpper but I couldn't find any documantion for its function.
Can someone please find me one ? Or better, give me better warrper.

  



  I already tried FFMpegCore, its working but very slow. For Exaple it takes 20 seconds to decode a specific frame.(And i have monstruos computer)
If will be happy if ou could give me better warpper, or a guide for ffmpeg.autogen.
Thanks in advance.

  


• How to create a Master Playlist for HLS using a Java wrapper library for FFMPEG

  17 janvier 2019, par Abhishek Nandgaonkar

  I am trying to find/use a Java Library that wraps around FFMPEG to create HLS compatible segments and metadata files along with a master metadata file.

  Most existing libraries perform encoding just fine and allow extra functions for additional audio/video parameters. But I could not find a good way for using them to create a master metadata file and other resolution/bandwidth/bitrate based metadata + segments.

  One way that I am planning to go about it is running the piece of code that performs HLS for me multiple times to suit the different bitrates and then programmatically look at the metadata files to compose the master metadata file. But that adds room for errors.

  If you know of an existing library that can do it for me. Please share the details. It would really help out.

  Libraries :

  • https://github.com/bramp/ffmpeg-cli-wrapper
  • https://github.com/hoary/JavaAV
  • https://github.com/kokorin/Jaffree
  • http://www.xuggle.com/

  Documentation (see Section Master Playlist)
  https://developer.apple.com/library/content/referencelibrary/GettingStarted/AboutHTTPLiveStreaming/about/about.html

  FFMPEG command line code that works for me

  ffmpeg -loglevel debug -threads 4 -vsync 1 -i 'id.mp4' -vf yadif -g 29.97 -r 29.97 -b:v:0 5250k -c:v libx264 -rc:v vbr_hq -pix_fmt yuv420p -profile:v main -level 4.1 -rc-lookahead 32 -forced-idr 1 -b:v:1 4200k -c:v libx264 -rc:v vbr_hq -pix_fmt yuv420p -profile:v main -level 4.1 -rc-lookahead 32 -forced-idr 1 -b:v:1 3150k -c:v libx264 -rc:v vbr_hq -pix_fmt yuv420p -profile:v main -level 4.1 -rc-lookahead 32 -forced-idr 1 -b:a:0 256k -b:a:0 192k -b:a:0 128k -c:a aac -ar 48000  -map 0:v -map 0:a:0 -map 0:v -map 0:a:0 -map 0:v -map 0:a:0 -f hls -var_stream_map "v:0,a:0  v:1,a:1 v:2,a:2" -master_pl_name  master.m3u8 -t 300 -hls_time 10 -hls_init_time 4 -hls_list_size 0 -master_pl_publish_rate 10 -hls_flags delete_segments+discont_start+split_by_time "vs%v_manifest.m3u8"

  Any help would be appreciated. Thanks in advance.

• Build ffmpeg static library on Mac

  15 avril 2018, par CoXier

  From guide, I can successfully compile ffmpeg on Mac. After compiling, I get a binary file ffmpeg which can be executed.

  Now I have to build ffmpeg project to a static library so that I can compile it with others c source file to a so or dylib file.

  From source code, I find ffmpeg.c and ffmpeg.h in FFmpeg/fftools/ directory and there is also a Makefile file. And its content is :

  AVPROGS-$(CONFIG_FFMPEG)   += ffmpeg
  
  AVPROGS-$(CONFIG_FFPLAY)   += ffplay
  
  AVPROGS-$(CONFIG_FFPROBE)  += ffprobe
  
  
  
  AVPROGS     := $(AVPROGS-yes:%=%$(PROGSSUF)$(EXESUF))
  
  PROGS       += $(AVPROGS)
  
  
  
  AVBASENAMES  = ffmpeg ffplay ffprobe
  
  ALLAVPROGS   = $(AVBASENAMES:%=%$(PROGSSUF)$(EXESUF))
  
  ALLAVPROGS_G = $(AVBASENAMES:%=%$(PROGSSUF)_g$(EXESUF))
  
  
  
  OBJS-ffmpeg                        += fftools/ffmpeg_opt.o fftools/ffmpeg_filter.o fftools/ffmpeg_hw.o
  
  OBJS-ffmpeg-$(CONFIG_CUVID)        += fftools/ffmpeg_cuvid.o
  
  OBJS-ffmpeg-$(CONFIG_LIBMFX)       += fftools/ffmpeg_qsv.o
  
  ifndef CONFIG_VIDEOTOOLBOX
  
  OBJS-ffmpeg-$(CONFIG_VDA)          += fftools/ffmpeg_videotoolbox.o
  
  endif
  
  OBJS-ffmpeg-$(CONFIG_VIDEOTOOLBOX) += fftools/ffmpeg_videotoolbox.o
  
  
  
  define DOFFTOOL
  
  OBJS-$(1) += fftools/cmdutils.o fftools/$(1).o $(OBJS-$(1)-yes)
  
  $(1)$(PROGSSUF)_g$(EXESUF): $$(OBJS-$(1))
  
  $$(OBJS-$(1)): | fftools
  
  $$(OBJS-$(1)): CFLAGS  += $(CFLAGS-$(1))
  
  $(1)$(PROGSSUF)_g$(EXESUF): LDFLAGS += $(LDFLAGS-$(1))
  
  $(1)$(PROGSSUF)_g$(EXESUF): FF_EXTRALIBS += $(EXTRALIBS-$(1))
  
  -include $$(OBJS-$(1):.o=.d)
  
  endef
  
  
  
  $(foreach P,$(AVPROGS-yes),$(eval $(call DOFFTOOL,$(P))))
  
  
  
  all: $(AVPROGS)
  
  
  
  fftools/ffprobe.o fftools/cmdutils.o: libavutil/ffversion.h | fftools
  
  OBJDIRS += fftools
  
  
  
  ifdef AVPROGS
  
  install: install-progs install-data
  
  endif
  
  
  
  install-progs-yes:
  
  install-progs-$(CONFIG_SHARED): install-libs
  
  
  
  install-progs: install-progs-yes $(AVPROGS)
  
      $(Q)mkdir -p "$(BINDIR)"
  
      $(INSTALL) -c -m 755 $(AVPROGS) "$(BINDIR)"
  
  
  
  uninstall: uninstall-progs
  
  
  
  uninstall-progs:
  
      $(RM) $(addprefix "$(BINDIR)/", $(ALLAVPROGS))
  
  
  
  clean::
  
      $(RM) $(ALLAVPROGS) $(ALLAVPROGS_G) $(CLEANSUFFIXES:%=fftools/%)

  Now I want to compile ffmpeg to a static library. But I am new to Makefile and it seems very hard. Can anyone help me ?

  EDIT

  I want ffmpeg.a file instead of ffmpeg binary file.