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• Video concatenation using ffmpeg. Output video length is longer than inputs length

  28 décembre 2022, par Rostyslav Mosorov

  I have a problem with video mp4 concatenation using ffmpeg. I have two the same videos and I want to concatenate them. I created file inputs.txt and then used command :

  


  ffmpeg  -f concat -i inputs.txt -c copy mergedVideo.mp4

  


  Output :

  


  ffmpeg  -f concat -i inputs.txt -c copy mergedVideo.mp4
ffmpeg version 5.0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with clang version 12.0.1
  configuration: --prefix=/Users/runner/miniforge3/conda-bld/ffmpeg_1649114094397/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_pl --cc=arm64-apple-darwin20.0.0-clang --disable-doc --disable-openssl --enable-demuxer=dash --enable-gnutls --enable-gpl --enable-hardcoded-tables --enable-libfreetype --enable-libopenh264 --enable-neon --enable-libx264 --enable-libx265 --enable-libaom --enable-libsvtav1 --enable-libxml2 --enable-libvpx --enable-pic --enable-pthreads --enable-shared --disable-static --enable-version3 --enable-zlib --enable-libmp3lame --pkg-config=/Users/runner/miniforge3/conda-bld/ffmpeg_1649114094397/_build_env/bin/pkg-config --enable-cross-compile --arch=arm64 --target-os=darwin --cross-prefix=arm64-apple-darwin20.0.0- --host-cc=/Users/runner/miniforge3/conda-bld/ffmpeg_1649114094397/_build_env/bin/x86_64-apple-darwin13.4.0-clang
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x1561044a0] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from 'inputs.txt':
  Duration: N/A, start: -0.064000, bitrate: 1424 kb/s
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 1355 kb/s, 50 fps, 50 tbr, 12800 tbn
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 16000 Hz, mono, fltp, 68 kb/s
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
File 'mergedVideo.mp4' already exists. Overwrite? [y/N] y
Output #0, mp4, to 'mergedVideo.mp4':
  Metadata:
    encoder         : Lavf59.16.100
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 1355 kb/s, 50 fps, 50 tbr, 12800 tbn
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 16000 Hz, mono, fltp, 68 kb/s
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=    0 fps=0.0 q=-1.0 size=       0kB time=00:00:00.06 bitrate=   6.0k[mov,mp4,m4a,3gp,3g2,mj2 @ 0x154f28b20] Auto-inserting h264_mp4toannexb bitstream filter
frame=  166 fps=0.0 q=-1.0 Lsize=     583kB time=00:00:03.39 bitrate=1407.4kbits/s speed= 179x    
video:550kB audio:29kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.737394%


  


  Unfortunately the result is different then I expected :
  
movies comparison

  


  The output is longer than the length of two inputs. Any thoughts ?

  


  Also I tried using different commands :

  


  ffmpeg  -f concat -i inputs.txt -c copy mergedVideo.mp4


  


  or set the framerate :

  


  ffmpeg -r 50 -f concat -i inputs.txt -c copy mergedVideo.mp4


  


  What is also weird that I have the same problem when using moviepy library.

  


  from moviepy.editor import VideoFileClip, concatenate_videoclips
videos = [VideoFileClip("0.mp4"), VideoFileClip("0.mp4")]
concatenate_videoclips(videos).write_videofile('mergedVideo.mp4')


  


  Update
ffprobe command for output file

  


  ffprobe -v error -select_streams v -show_entries stream=codec_name,time_base,start_pts,start_time,duration -of default=noprint_wrappers=1 mergedVideo.mp4 
codec_name=h264
time_base=1/12800
start_pts=0
start_time=0.000000
duration=3.380000


  


  For input :

  


  ffprobe -v error -select_streams v -show_entries stream=codec_name,time_base,start_pts,start_time,duration -of default=noprint_wrappers=1 0.mp4          
codec_name=h264
time_base=1/12800
start_pts=0
start_time=0.000000
duration=1.660000


  


  The duration supposed to be 2*1.66 = 3.32 and but it's 3.38.

  


  Content of the inputs.txt

  


  file '0.mp4'
file '0.mp4'


  


• Merging two video files with ffmpeg and xfade filter cuts the first video

  29 décembre 2022, par rlib

  I try to concatenate two mp4 videos using ffmpeg's xfade filter :

  


  ffmpeg -y -i x1.mp4 -i x2.mp4 -filter_complex "[0][1]xfade=transition=dissolve:duration=2:offset=2" dissolveVideo4.mp4


  


  x1.mp4 is 14.52 seconds and x2.mp4 is 12.46 seconds. The resulting video is 14.48 seconds.
Examining the resulting video shows the first input contributed only 4 seconds at its end, the remaining is the second video.

  


  This happens with any of the available transitions (fade etc.).

  


  Here is the output of the ffmpeg command above :

  


  ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: 
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'x1.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2022-12-29T15:10:27.000000Z
    location        : +32.7648+035.0443/
    location-eng    : +32.7648+035.0443/
    com.android.version: 13
    com.android.capture.fps: 30.000000
  Duration: 00:00:14.52, start: 0.000000, bitrate: 17707 kb/s
  Stream #0:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/smpte170m, progressive), 1920x1080, 17449 kb/s, 29.96 fps, 30 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2022-12-29T15:10:27.000000Z
      handler_name    : VideoHandle
      vendor_id       : [0][0][0][0]
    Side data:
      displaymatrix: rotation of -90.00 degrees
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
    Metadata:
      creation_time   : 2022-12-29T15:10:27.000000Z
      handler_name    : SoundHandle
      vendor_id       : [0][0][0][0]
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'x2.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2022-12-29T15:10:47.000000Z
    location        : +32.7648+035.0443/
    location-eng    : +32.7648+035.0443/
    com.android.version: 13
    com.android.capture.fps: 30.000000
  Duration: 00:00:12.46, start: 0.000000, bitrate: 17461 kb/s
  Stream #1:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/smpte170m, progressive), 1920x1080, 17201 kb/s, 30.01 fps, 30 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2022-12-29T15:10:47.000000Z
      handler_name    : VideoHandle
      vendor_id       : [0][0][0][0]
    Side data:
      displaymatrix: rotation of -90.00 degrees
  Stream #1:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
    Metadata:
      creation_time   : 2022-12-29T15:10:47.000000Z
      handler_name    : SoundHandle
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 (h264) -> xfade (graph 0)
  Stream #1:0 (h264) -> xfade (graph 0)
  xfade:default (graph 0) -> Stream #0:0 (mpeg4)
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mp4, to 'dissolveVideo4.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    com.android.capture.fps: 30.000000
    location        : +32.7648+035.0443/
    location-eng    : +32.7648+035.0443/
    com.android.version: 13
    encoder         : Lavf59.27.100
  Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, bt709/bt709/smpte170m, progressive), 1080x1920, q=2-31, 200 kb/s, 30 fps, 15360 tbn
    Metadata:
      encoder         : Lavc59.37.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2022-12-29T15:10:27.000000Z
      handler_name    : SoundHandle
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.37.100 aac
frame=  435 fps=145 q=31.0 Lsize=    7688kB time=00:00:14.48 bitrate=4347.9kbits/s speed=4.82x    
video:7443kB audio:231kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.181913%


  


  What can be a problem ?

  


• FFmpeg build error pkg-config can't find x265 /usr/bin/ld : cannot find -lnuma : No such file or directory

  1er janvier 2023, par slyfox1186

  I am trying to build ffmpeg with custom libraries from source code.

  


  Every package in my script builds as it should but when it gets time to run the ffmpeg build using all of the packages it fails with a weird error code shown at the bottom of the ffmpeg build log.

  


  BEGIN /home/jman/tmp/ffconf.JouXp6kg/test.c
    1   #include 
    2   #include 
    3   long check_x265_api_get(void) { return (long) x265_api_get; }
    4   int main(void) { int ret = 0;
    5    ret |= ((intptr_t)check_x265_api_get) & 0xFFFF;
    6   return ret; }
END /home/jman/tmp/ffconf.JouXp6kg/test.c
gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -I/home/jman/Documents/ffmpeg-build/workspace/include -I/home/jman/Documents/ffmpeg-build/workspace/include/lilv-0 -I/usr/local/cuda/include -std=c11 -fomit-frame-pointer -fPIC -I/home/jman/Documents/ffmpeg-build/workspace/include -pthread -DLILV_STATIC -DSRATOM_STATIC -DSORD_STATIC -DSERD_STATIC -I/home/jman/Documents/ffmpeg-build/workspace/include/lilv-0 -I/home/jman/Documents/ffmpeg-build/workspace/include/sratom-0 -I/home/jman/Documents/ffmpeg-build/workspace/include -I/home/jman/Documents/ffmpeg-build/workspace/include/sord-0 -I/home/jman/Documents/ffmpeg-build/workspace/include/serd-0 -I/home/jman/Documents/ffmpeg-build/workspace/include -I/home/jman/Documents/ffmpeg-build/workspace/include/opus -I/home/jman/Documents/ffmpeg-build/workspace/include/opus -I/home/jman/Documents/ffmpeg-build/workspace/include -I/home/jman/Documents/ffmpeg-build/workspace/include/srt -I/home/jman/Documents/ffmpeg-build/workspace/include/svt-av1 -I/home/jman/Documents/ffmpeg-build/workspace/include -I/home/jman/Documents/ffmpeg-build/workspace/include -I/home/jman/Documents/ffmpeg-build/workspace/include -I/home/jman/Documents/ffmpeg-build/workspace/include -I/home/jman/Documents/ffmpeg-build/workspace/include -I/home/jman/Documents/ffmpeg-build/workspace/include -I/home/jman/Documents/ffmpeg-build/workspace/include -I/home/jman/Documents/ffmpeg-build/workspace/include -L/usr/lib/x86_64-linux-gnu -c -o /home/jman/tmp/ffconf.JouXp6kg/test.o /home/jman/tmp/ffconf.JouXp6kg/test.c
gcc -L/home/jman/Documents/ffmpeg-build/workspace/lib -L/usr/local/cuda/lib64 -Wl,--as-needed -Wl,-z,noexecstack -L/usr/lib/x86_64-linux-gnu -o /home/jman/tmp/ffconf.JouXp6kg/test /home/jman/tmp/ffconf.JouXp6kg/test.o -lx265 -lstdc++ -lm -lgcc_s -lgcc -lgcc_s -lgcc -lrt -ldl -lnuma -ldl -lpthread -lm -lz
/usr/bin/ld: cannot find -lnuma: No such file or directory
collect2: error: ld returned 1 exit status
ERROR: x265 not found using pkg-config


  


  Does anyone know what this -lnuma is referring to ?

  


  I had no issues just a few days ago when I last ran my build script and then all of a sudden this issue appeared.

  


  This is my build script in its entirety : FFmpeg-build.sh

  


  Update : Per Allan Winds' instructions here is the output of :

  


  find /usr/lib -name libnuma\* -ls

  


    4987897     48 -rw-r--r--   1 root     root        48152 Mar 24  2022 /usr/lib/x86_64-linux-gnu/libnuma.so.1.0.0
  4992286     76 -rw-r--r--   1 root     root        77086 Mar 24  2022 /usr/lib/x86_64-linux-gnu/libnuma.a
  4987896      0 lrwxrwxrwx   1 root     root           16 Dec 29 12:03 /usr/lib/x86_64-linux-gnu/libnuma.so.1 -> libnuma.so.1.0.0
  4992287      0 lrwxrwxrwx   1 root     root           16 Mar 24  2022 /usr/lib/x86_64-linux-gnu/libnuma.so -> libnuma.so.1.0.0