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• Concatenate multiple videos with a black screen loop into one video

  23 février 2020, par Marcel

  I am using ffmpeg to join a bunch of videos together.
  I am using the classic join ffmpeg code :
  

  ffmpeg -f concat -i joinlist.txt -c copy joinedfile.mp4

  but the problem is that the videos are of different formats, encodings, but the same size : all 640x480. I want to join them all and put a black screen video with no sound every other video :

  video1 + black_screen_video + video2 + black_screen_video + video3 ...

  I generated a black screen video of 2 seconds duration using :

  ffmpeg -f lavfi -i color=c=black:s=640x480:d=2 black_screen_video.mp4

  so all of the videos are of the same size : 640x480, and 25 fps but different codecs. The videos have sound, except for the black screen video.
  I can’t do anything manual, because the number of videos are around several hundred. So it has got to be an automatic way to do all this.

  When I joined them together using the above code, the resulting video does not play correctly at all.

  I know that I have to re-encode them, but how to do this to all these videos at once, with one line of code ?

  Update :
  I am already using with success this code to join them together, but only three, if I have more than one hundred, it is time consuming to write down one by one :

  ffmpeg -i vid1.avi -i vid2.avi -i vid3.avi -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] concat=n=3:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" output.mp4

  but this is joining only the videos, not looping the black screen video. When I do with black screen, ffmpeg gives me stream matching errors.

  update :

  here is the console image :
  

  2nd update :

  a very long list of errors in red, of which a screenshot here :
  

• Android NDK w/ ffmpeg library - error running project

  11 novembre 2014, par ynnadkrap

  Using this guide, http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9/, I successfully compiled ffmpeg-2.4.2 with Android NDK 10, but now I’m having issues using it in my eclipse project.

  The error I’m getting :

  *** Android NDK: Aborting    .  Stop.

  which points to this in prebuilt-library.mk :

  ifndef prebuilt
  
  $(call __ndk_info,ERROR:$(LOCAL_MAKEFILE):$(LOCAL_MODULE): LOCAL_SRC_FILES points to a missing file)
  
  $(call __ndk_info,Check that $(prebuilt_path) exists, or that its path is correct)
  
  $(call __ndk_error,Aborting) <----- ***** This line is specifically pointed out by the error log
  
  endif

  Here’s my ...jni/Android.mk :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  
  
  LOCAL_MODULE    := VideoTest
  
  LOCAL_SRC_FILES := videotest.c
  
  LOCAL_LDLIBS := -llog -ljnigraphics -lz -landroid
  
  LOCAL_SHARED_LIBRARIES := libavformat libavcodec libswscale libavutil
  
  
  
  include $(BUILD_SHARED_LIBRARY)
  
  $(call import-module,ffmpeg-2.4.2/android/arm)

  Here’s my android-ndk/sources/ffmpeg-2.4.2/android/arm/Android.mk :

  LOCAL_PATH:= $(call my-dir)
  
  
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavcodec
  
  LOCAL_SRC_FILES:= lib/libavcodec-55.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavformat
  
  LOCAL_SRC_FILES:= lib/libavformat-55.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libswscale
  
  LOCAL_SRC_FILES:= lib/libswscale-2.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavutil
  
  LOCAL_SRC_FILES:= lib/libavutil-52.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavfilter
  
  LOCAL_SRC_FILES:= lib/libavfilter-3.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libwsresample
  
  LOCAL_SRC_FILES:= lib/libswresample-0.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)

  Here’s my project structure :

  http://imgur.com/2vMryOS

  So it seems to me that the project isn’t building because the LOCAL_SRC_FILES doesn’t point to anything, but is it referring to LOCAL_SRC_FILES in jni/Android.mk or the one in ...ffmpeg-2.4.2/android/arm/Android.mk ? Either way, it seems like they are actually pointing to something. I’ve also tried looking at this solution, Android NDK : Aborting stop ?, but I’m having a hard time understanding it. Which Android.mk file needs changing ?

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

  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)