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  • ffmpeg messes up delayed inputs (repeats at the beginning)

    20 mars 2023, par Ralph

    ffmpeg plays audio inputs delayed to t1, t2 etc at t=0.
If there are several inputs, then it replicates one after the other (after in0 finishes with its duration duration(in0), plays another one at t=duration(in0), etc.)

    


    In the following example, the in0 is played at t=0.

    


    ffmpeg -i in0.mp3 -i in1.mp3 -i in2.mp3 -filter_complex "[0]adelay=1000[delayed1];[1]adelay=2000[delayed2];[2]adelay=3000[delayed3];[delayed1][delayed2][delayed3]amix=inputs=3:duration=longest" -codec:a libmp3lame -q:a 4 output.mp3


    


    The command performs the following : 1. The ffmpeg processes three input files (mp3). 2. The complex filter delays the inputs by 1, 2, 3 seconds input-wise. 3. amix mixes the delayed outputs together. 4. And finally, a coded transforms it into an output mp3.

    


    Another short version : 2 delayed beeps, an finally there come 3 beeps out (@ 0, 1, 2 seconds) :

    


    ffmpeg -i beep.mp3 -filter_complex "[0]adelay=1000[delayed1];[0]adelay=2000[delayed2];[delayed1][delayed2]amix=inputs=2:duration=longest" -codec:a libmp3lame -q:a 4 output.mp3


    


    ffmpeg version N-110011-gf456c192d9-tessus on a Mac M1, downloaded as binary from https://evermeet.cx/ffmpeg (01.2023).

    


    I added also a silent input file from 0 to 1 seconds without any alteration of the outcome.
I added a silent stream as input as well without improvement. E.g. :

    


    ... -filter_complex "aevalsrc=0:d=4[silence];...


    


    Another test with another ffmpeg version 5.1 Copyright (c) 2000-2022 the FFmpeg developers built with Apple clang version 13.1.6 (clang-1316.0.21.2.5) :
ffmpeg -i beep.mp3 -filter_complex "[0]adelay=1000[delayed1];aevalsrc=0:d=5[silence];[silence][delayed1]amix=inputs=2:duration=longest" -codec:a libmp3lame -q:a 4 output.mp3
There are again 2 beeps, at 0 and 1 second.

    


    (comment : concat solves the issue. But I want to have a flexible solution with possibly overlapping audio streams.) Thanks for giving a hint !

    


  • 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


    


  • 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 ?

    


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