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• Is it possible to merge 3 videos with ffmpeg by -f concat and crossfade without video content

  10 août 2019, par user3792705

  I want to merge 3 .mov files quickly without losing any resolution. I want to be able to distinguish the 3 pieces of videos after merge.

  "ffmpeg -f concat" does not lose resolution and quick without crossfade.

  But, I can’t distinguish 3 videos.

  As far as I know ffmpeg filter can be used add crossfade, but it have to use video start/end content to do the merger, which might involve transcoding. It won’t be fast compared with ’concat’, which won’t do transcoding, but simply copying.

  Here is the content (ffmpeg -i video.mov) of one of 3 videos :

  ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 10.0.1 (clang-1001.0.46.3)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '..../(edited)/VMEK8375.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2019-06-30T01:28:04.000000Z
  
      com.apple.quicktime.model: iPhone
  
      com.apple.quicktime.software: ZHIYUN
  
      com.apple.quicktime.creationdate: 2019-06-30T09:28:04Z
  
    Duration: 00:00:07.61, start: 0.000000, bitrate: 4386 kb/s
  
      Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, smpte170m/bt709/bt709), 1280x720, 4329 kb/s, 30.01 fps, 30 tbr, 600 tbn, 600 tbc (default)
  
      Metadata:
  
        creation_time   : 2019-06-30T01:28:04.000000Z
  
        handler_name    : Core Media Video
  
        encoder         : HEVC
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 94 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-06-30T01:28:04.000000Z
  
        handler_name    : Core Media Audio

  If I don’t care about crossfade with video content, just some ’nice’ black screen in between (It would be nice I add some text, like date + time on the black screen) is good enough for me. Is it possible to do ’concat’ and simple crossfade without video ’content’ ?

• libavcodec.a(vc1dsp_mmx.o) : relocation R_X86_64_PC32 against symbol `ff_pw_9'

  15 juillet 2021, par Guru Govindan

  I am building an shared object file in ubuntu(vagrant) that uses ffmpeg libraries(libavcodec.a, libavformat.a, libavutil.a). I first used the standard configure options to build ffmpeg and libraries from trac.ffmpeg. But there was some issues with dynamic linking and I modified the configure options a little bit to add --enable-shared and -fPIC options.

  



  However when I build my application I get 
/usr/bin/ld: /root/ffmpeg_build/lib/libavcodec.a(vc1dsp_mmx.o): 
relocation R_X86_64_PC32 against symbol `ff_pw_9' can not be used when
 making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Bad value
collect2: error: ld returned 1 exit status


  



  I used the following options in my configure to build ffmpeg

  



  PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig:$PKG_CONFIG_PATH" ./configure \
  --prefix="$HOME/ffmpeg_build" \
  --pkg-config-flags="--static" \
  --extra-cflags="-I$HOME/ffmpeg_build/include -fPIC" \
  --extra-ldflags="-L$HOME/ffmpeg_build/lib -Wl,-Bsymbolic" \
  --extra-libs="-lpthread -lm" \
  --bindir="$HOME/bin" \
  --enable-gpl \
  --enable-libass \
  --enable-libfdk-aac \
  --enable-libfreetype \
  --enable-libmp3lame \
  --enable-libopus \
  --enable-libvorbis \
  --enable-libvpx \
  --enable-libx264 \
  --enable-libx265 \
  --enable-nonfree \
  --enable-pic \
  --enable-shared


  



  The build works fine on my MAC.

  



  The following is my cmake file to build my application

  



  cmake_minimum_required(VERSION 3.5)
project(extractor C)

set(CMAKE_C_STANDARD 99)

set(EXECUTABLE_NAME "extractor")

set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/CMakeModules)

set(EXTRACTOR_VERSION "${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}.${CPACK_PACKAGE_VERSION_PATCH}")
set(target_dir "bin")

# set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -std=99")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g")
# set(CMAKE_SHARED_LINKER_FLAGS "-Wl,-Bsymbolic")


add_library(${EXECUTABLE_NAME} SHARED src/frame_extractor.c)

include_directories(".")
find_package(FFmpeg REQUIRED)

if (FFMPEG_FOUND)
    message("Found FFMPEG/LibAV libraries ${FFMPEG_LIBRARIES}")
        message("include dirs ${FFMPEG_INCLUDE_DIR}")
    include_directories(${FFMPEG_INCLUDE_DIR})
    target_link_libraries(${EXECUTABLE_NAME} ${FFMPEG_LIBRARIES})
else (FFMPEG_FOUND)
    message("cant find libavcodec, libavformat or libavutil. add them manually!!")
endif (FFMPEG_FOUND)

target_link_libraries(${EXECUTABLE_NAME} ${FFMPEG_LIBRARIES})
# target_link_libraries (${EXECUTABLE_NAME} "-lm")
# target_link_libraries (${EXECUTABLE_NAME} "-lavcodec")

if(APPLE)
    #target_link_libraries(${EXECUTABLE_NAME} "-framework CoreServices")
    #target_link_libraries(${EXECUTABLE_NAME} "-framework CoreFoundation")
    #target_link_libraries(${EXECUTABLE_NAME} "-framework AudioToolbox")
    #target_link_libraries(${EXECUTABLE_NAME} "-framework VideoToolbox")
    #target_link_libraries(${EXECUTABLE_NAME} "-framework CoreAudio")
    #target_link_libraries(${EXECUTABLE_NAME} "-framework CoreMedia")
    #target_link_libraries(${EXECUTABLE_NAME} "-framework CoreVideo")
    #target_link_libraries(${EXECUTABLE_NAME} "-framework AVFoundation")
    #target_link_libraries(${EXECUTABLE_NAME} "-framework Security")
    #target_link_libraries(${EXECUTABLE_NAME} /usr/lib/libbz2.1.0.dylib)
    #target_link_libraries(${EXECUTABLE_NAME} /usr/lib/libz.1.dylib)
    #target_link_libraries(${EXECUTABLE_NAME} /usr/lib/libiconv.dylib)
    #target_link_libraries(${EXECUTABLE_NAME} /usr/lib/liblzma.dylib)
    #target_link_libraries(${EXECUTABLE_NAME} /usr/local/lib/libswresample.a)
    #target_link_libraries(${EXECUTABLE_NAME} /usr/local/Cellar/fdk-aac/0.1.6/lib/libfdk-aac.dylib)
    #target_link_libraries(${EXECUTABLE_NAME} /usr/local/lib/libx264.dylib)
endif(APPLE)
# Add python dependencies -
# ERROR - It picks up the default version from the machine which is 2.7.10
find_package( PythonInterp 2.7 REQUIRED)
find_package(PythonLibs 2.7 REQUIRED)


message("GURU - python include dirs = ${PYTHON_INCLUDE_DIRS}")
message("GURU - python include dirs = ${PYTHON_LIBRARIES}")

include_directories(${PYTHON_INCLUDE_DIRS})
target_link_libraries(${EXECUTABLE_NAME} ${PYTHON_LIBRARIES})



# Apple creates annoying dylib extension for shared libraries
if(APPLE)
    SET(CMAKE_SHARED_LIBRARY_SUFFIX ".so")
endif(APPLE)
set(CMAKE_SHARED_LIBRARY_PREFIX "")


  



  Thanks a lot for any help in resolving this.

  


• Bewildering issue - FFmpeg segment filter desyncs video

  14 mai 2018, par r_jei

  I need to segment a large (72GB) Prores video file and merge the segments to get a file identical to the original.

  ./ffmpeg -i video.mov -codec copy -f segment -segment_time 300 -segment_list list.ffcat -reset_timestamps 1 -v error chunk_%d.mov

  Unfortunately the segments that come from running this command get out of sync after a few seconds of playback with Quicktime Player. Interestingly, seeking, rewinding or fast forwarding appears to resync the video correctly for at least a few seconds.

  The following warning appears whenever a new segment is written :

  [segment @ 0x7f87ae001200] Opening 'chunk_0.mov' for writing
  
  [mov @ 0x7f87ad807200] Valid timecode frame rate must be specified. Minimum value is 1

  Yet, setting the framerate with -r 24 doesn’t help.

  Some potentially relevant metadata :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'A004_04121423_C001.mov':
  
    Duration: 00:13:31.25, start: 0.000000, bitrate: 710117 kb/s
  
      Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(bt709, progressive), 3840x2160, 707415 kb/s, SAR 1:1 DAR 16:9, 24 fps, 24 tbr, 24 tbn, 24 tbc (default)
  
      Metadata:
  
        creation_time   : 2018-04-12T20:23:16.000000Z
  
        handler_name    : ?Apple Alias Data Handler
  
        timecode        : 14:23:16:02
  
      Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-04-12T20:23:16.000000Z
  
        handler_name    : ?Apple Alias Data Handler
  
        timecode        : 14:23:16:02
  
      Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
  
      Metadata:
  
        creation_time   : 2018-04-12T20:23:16.000000Z
  
        handler_name    : ?Apple Alias Data Handler
  
        timecode        : 14:23:16:02
  
  
  
  Output #0, segment, to 'chunk_%d.mov':
  
      Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(bt709, progressive), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 707415 kb/s, 24 fps, 24 tbr, 12288 tbn, 24 tbc (default)
  
      Metadata:
  
        creation_time   : 2018-04-12T20:23:16.000000Z
  
        handler_name    : ?Apple Alias Data Handler
  
        timecode        : 14:23:16:02
  
      Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-04-12T20:23:16.000000Z
  
        handler_name    : ?Apple Alias Data Handler
  
        timecode        : 14:23:16:02
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)

  I’m on OS X.

  Thanks so much for your time and help on this issue ! I certainly hope I’m not missing something obvious :)

  ---

  UPDATE (May 10) : Comparing the original video file with the segments, I’ve found some interesting differences. Adobe Premiere reports that the original video has the following properties :

  QuickTime Details:
  
  Movie contains 1 video track(s), 1 audio track(s), 0 closed caption track(s), **and 1 timecode track(s).**
  
  
  
  Video:
  
  There are 19470 frames with a **duration of 1/24th.**
  
  
  
  Video track 1:
  
  Duration is **0:13:31:06**
  
  
  
  Video data block #1:
  
  Frame Size = 3840 x 2160
  
  Compressor = 
  
  **Quality = Most (-2623.00)
  
  Temporal = Most (1.00)**
  
  
  
  Timecode data block #1:
  
  Start Time = 14:23:16:02
  
  Reel name = 

  On the other hand, when examining the video resulting from stitching together the segments, we find the following :

  QuickTime Details:
  
  Movie contains 1 video track(s), 1 audio track(s), 0 closed caption track(s), **and 0 timecode track(s).**
  
  
  
  Video:
  
  There are 19470 frames with a **duration of 41/1000ths.**
  
  
  
  Video track 1:
  
  Duration is **0:01:06:00**
  
  
  
  Video data block #1:
  
  Frame Size = 3840 x 2160
  
  Compressor = 
  
  **Quality = Normal (3.00)
  
  Temporal = Normal (3.00)**