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• output of ffmpeg comes out like yamborghini high music video

  19 janvier, par chip

  I do this procedure when I edit a long video

  


  

  • segment to 3 second videos, so I come up with a lot of short videos

  


  • I randomly pick videos and put them in a list

  


  • then I join these short videos together using concat

  


  • now I get a long video again. next thing I do is segment the video 4 minute videos

  


  


  After processing, the videos look messed up. I don't know how to describe it but it looks like the music video yamborghini high

  


  For some reason, this only happens to videos I capture at night. I do the same process for day time footage, no problem.

  


  is there a problem with slicing, merging and then slicing again ?

  


  or is it an issue that I run multiple ffmpeg scripts at the same time ?

  


  here's the script

  


  for FILE in *.mp4; do ffmpeg -i ${FILE} -vcodec copy -f segment -segment_time 00:10 -reset_timestamps 1 "part_$( date '+%F%H%M%S' )_%02d.mp4"; rm -rf $FILE; done; echo 'slicing completed.' && \ 
for f in part_*[13579].mp4; do echo "file '$f'" >> mylist.txt; done
ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4 && echo 'done merging.' && \ 
ffmpeg -i output.mp4 -threads 7 -vcodec copy -f segment -segment_time 04:00 -reset_timestamps 1 "Video_Title_$( date '+%F%H%M%S' ).mp4" && echo 'individual videos created'




  


• Building a shared library from static libraries for ffmpeg 2.5.2

  7 janvier 2015, par abijinx

  I am currently building a shared library for ffmpeg as myffmpeg.so using ffmpeg 0.8.6. I am achieving by combining static libs of individual modules of ffmpeg, along with a few additional static libraries. The main makefile used is as follows :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(LOCAL_PATH)/Android_Files.mk
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavcodec
  
  LOCAL_SRC_FILES:= $(MY_AVCODEC_FILES)
  
  include $(LOCAL_PATH)/Android_Common.mk
  
  include $(BUILD_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavfilter
  
  LOCAL_SRC_FILES:= $(MY_AVFILTER_FILES)
  
  include $(LOCAL_PATH)/Android_Common.mk
  
  include $(BUILD_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavformat
  
  LOCAL_SRC_FILES:= $(MY_AVFORMAT_FILES)
  
  include $(LOCAL_PATH)/Android_Common.mk
  
  include $(BUILD_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavutil
  
  LOCAL_SRC_FILES:= $(MY_AVUTIL_FILES)
  
  include $(LOCAL_PATH)/Android_Common.mk
  
  include $(BUILD_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libswscale
  
  LOCAL_SRC_FILES:= $(MY_SWSCALE_FILES)
  
  include $(LOCAL_PATH)/Android_Common.mk
  
  include $(BUILD_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= ffmpeg_myc
  
  LOCAL_SRC_FILES:= ffmpeg.c cmdutils.c
  
  include $(LOCAL_PATH)/Android_Common.mk
  
  include $(BUILD_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE := myffmpeg
  
  LOCAL_WHOLE_STATIC_LIBRARIES := libavcodec libavfilter libavformat libavutil libswscale ffmpeg_c
  
  LOCAL_LDFLAGS += -lz -lm -llog
  
  ifeq ($(FF_ENABLE_AMR),yes)
  
  LOCAL_WHOLE_STATIC_LIBRARIES += opencore-amrnb opencore-amrwb
  
  endif
  
  ifeq ($(FF_ENABLE_AAC),yes)
  
  LOCAL_WHOLE_STATIC_LIBRARIES += vo-aacenc
  
  endif
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  The above makefile uses only few selected source files to get the individual static libs as mentioned in the FF_SOURCE_FILES parameter.Then combines all of those with the additional libs to create a shared library myffmpeg.so.

  Now I am trying to get a similar output with ffmpeg 2.5.2 for 64-bit arm architecture. This time I have built the latest ffmpeg using the following configure script and generated the static libraries of different ffmpeg modules like libavcodec.a, libavfilter.a, etc

  #!/bin/bash
  
  ABI=aarch64-linux-android
  
  NDK=
  
  SYSROOT=$NDK/platforms/android-21/arch-arm64/
  
  TOOLCHAIN=$NDK/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64
  
  CPU=arm64
  
  PREFIX=$(pwd)/android/$CPU
  
  ./configure \
  
  --prefix=$PREFIX \
  
  --cc=$TOOLCHAIN/bin/$ABI-gcc \
  
  --enable-static \
  
  --disable-doc \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-network \
  
  --disable-ffserver \
  
  --disable-devices \
  
  --disable-avdevice \
  
  --disable-swscale-alpha \
  
  --disable-doc \
  
  --disable-symver \
  
  --disable-neon \
  
  --enable-optimizations \
  
  --cross-prefix=$TOOLCHAIN/bin/aarch64-linux-android- \
  
  --target-os=linux \
  
  --arch=arm64 \
  
  --enable-cross-compile \
  
  --sysroot=$SYSROOT 
  
  
  
      --enable-libopencore-amrnb \
  
      --enable-libopencore-amrwb \
  
      --enable-libvo-aacenc \
  
      $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install 

  Now I am trying to combine the generated static libraries i.e

  • libavcodec.a
    libavfilter.a
    libavformat.a
    libavutil.a
    libswresample.a
    libswscale.a
    with

  • ffmpeg_myc opencore-amrnb opencore-amrwb

  and generate a myffmpeg.so shared library by giving ndk-build.

  I tried to paste the generated ffmpeg static libraries from ffmpeg/android folder to obj/local/arm64-v8a (path where are all the static libs were previously created in 0.8.6 according the makefile). I also made changes to the makefile thinking that it will use the already generated ffmpeg libraries. But I found that the size of the generated shared library was too low and that it has not included the generated ffmpeg libs.

  LOCAL_PATH := $(call my-dir)
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE := myffmpeg
  
  LOCAL_WHOLE_STATIC_LIBRARIES := libavcodec libavfilter libavformat libavutil libswscale ffmpeg_c
  
  LOCAL_LDFLAGS += -lz -lm -llog
  
  ifeq ($(FF_ENABLE_AMR),yes)
  
  LOCAL_WHOLE_STATIC_LIBRARIES += opencore-amrnb opencore-amrwb
  
  endif
  
  ifeq ($(FF_ENABLE_AAC),yes)
  
  LOCAL_WHOLE_STATIC_LIBRARIES += vo-aacenc
  
  endif
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  I would like to know whether I am going in a right way and have to do some minor changes. Or if I should start with an entirely different approach to achieve this. Any suggestions would be helpful.

  Thanks in advance

• FFmpeg corrupted output from concatenation

  25 juillet 2021, par Manumit

  EDIT/UPDATE : current solution is to run this code on all files ffmpeg -i up.mp4 -vf scale=1920:1080 -crf 22 reUP.mp4 so resolution, but also frames per second match.

  


  

  


  I used to be able to open CMD, type CD C:\Users\... and then ffmpeg -f concat -safe 0 -i xmylist.txt -crf 22 -c copy x1.mp4

  


  

  


  The recording are from same phone, some from front cam, some from back cam. I understand this could cause non-identical problems ? but it worked fine until recently.

  


  Now the output is corrupted with this log : 
The individual video files play just fine, so does most of the concatted output, but some sections become like this and freeze :