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• Is it possible to have a progress bar without a loop ?

  26 novembre 2017, par Kurt

  I am using FFmpeg to do some video editing. I would like to have a progress bar but there is not a loop in my code. I’ve tried tqdm and putting my code in a loop with a range of 1 but that will only display the progress bar at 100%. Maybe there is another way to accomplish this ? This is the code I’m using :

  import subprocess
  
  
  
  inmovie=mymovie.mp4
  
  speed=str(4.0)
  
  outmovie=newmovie.mp4
  
  print('Converting file.......')
  
  subprocess.call('ffmpeg -i '+inmovie+' -filter:v "setpts= '+speed+' *PTS" '+outmovie, shell=True)
  
  print('Conversion done') 

• FFmpeg not decreasing

  19 avril 2018, par David

  I need ffmpeg to transform a video stream into images and reduce their size only if they don’t fit in a 1000x1000 box.

  My issue is that if the image is smaller, ffmpeg increases the size of the image to 1000 in width or height, whereas I don’t want small images to be upscaled. The force_original_aspect_ratio=decrease does not seem to work here. Any ideas why ?

  Here is my shell command :

  ffmpeg -i 'rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov' -r 5 -vf scale=w=1000:h=1000:force_original_aspect_ratio=decrease -f image2 -qscale:v 1 ./output_%01d.jpg

• Compile FFmpeg project for ARM in PC Linux 64-bits

  4 avril 2017, par Dang_Ho

  I want to compile a simple FFmpeg project for my Arrow Sockit Board with an arm-linux-gnueabihf architecture from my Linux-64bit PC. I don’t want to compile the project in the board directly because of my low CPU and that is not convenient for me.

  I’m using FFmpeg version 2.8.11 and this is my Makefile and my "main.c". I know, my Makefile has something wrong in it. If I command "make", it will compile depending on my PC’s architecture, I can’t use that binary file on my board. So, can someone please tell me how to do it.

  I Cross-Compiled the FFmpeg package and installed into the board. I tested all functions such as ffmpeg, ffplay. All them work. The source code folder is located to /home/hohaidang/ffmpeg-2.8.11

  #include 
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  
  
  int main(int argc, char *argv[]){
  
          av_register_all();
  
          return 0;
  
  }

  # use pkg-config for getting CFLAGS and LDLIBS
  
  FFMPEG_LIBS=    libavdevice                        \
  
                  libavformat                        \
  
                  libavfilter                        \
  
                  libavcodec                         \
  
                  libswresample                      \
  
                  libswscale                         \
  
                  libavutil                          \
  
  
  
  CFLAGS += -Wall -g
  
  CFLAGS := $(shell pkg-config --cflags $(FFMPEG_LIBS)) $(CFLAGS)
  
  LDLIBS := $(shell pkg-config --libs $(FFMPEG_LIBS)) $(LDLIBS)
  
  
  
  EXAMPLES=       main
  
  
  
  OBJS=$(addsuffix .o,$(EXAMPLES))
  
  
  
  # the following examples make explicit use of the math library
  
  avcodec:           LDLIBS += -lm
  
  decoding_encoding: LDLIBS += -lm
  
  muxing:            LDLIBS += -lm
  
  resampling_audio:  LDLIBS += -lm
  
  
  
  .phony: all clean-test clean
  
  
  
  all: $(OBJS) $(EXAMPLES)
  
  
  
  clean-test:
  
          $(RM) test*.pgm test.h264 test.mp2 test.sw test.mpg
  
  
  
  clean: clean-test
  
          $(RM) $(EXAMPLES) $(OBJS)