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• ffmpeg : mix/merge multiple mp3 files, some do not mix

  28 août 2018, par C. Ovidiu

  I am trying to merge multiple mp3 files on top of each other on a CentOS 7 server.

  I am trying with ffmpeg but I have mixed results. When mixing 4 files, the last one for example does not mix with the others and is not audible in the final output.

  If I mix this file with another one or two(so max 3 files merged), it works.

  Is there a limit when merging ? For reference, each file is about 10mb is size and 5:00 minutes long.

  This is the command I am using

  ffmpeg -i /var/www/vhosts/site/httpdocs/uploads/tracks/1.mp3 -i /var/www/vhosts/site/httpdocs/uploads/tracks/2.mp3 -i /var/www/vhosts/site/httpdocs/uploads/tracks/3.mp3 -i /var/www/vhosts/site/httpdocs/uploads/tracks/4.mp3 -filter_complex amerge -ac 2 -c:a libmp3lame -q:a 4 /var/www/vhosts/site/httpdocs/uploads/mix.mp3

  The output after merging is this :

  ffmpeg version 2.8.15 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-28)
  
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --extra-ldflags='-Wl,-z,relro ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [mp3 @ 0x1c8ba60] Skipping 0 bytes of junk at 1044.
  
  Input #0, mp3, from '/var/www/vhosts/site/httpdocs/uploads/tracks/1.mp3':
  
    Duration: 00:05:44.08, start: 0.025057, bitrate: 320 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
  
      Metadata:
  
        encoder         : LAME3.98r
  
      Side data:
  
        replaygain: track gain - 6.000000, track peak - unknown, album gain - unknown, album peak - unknown,
  
  [mp3 @ 0x1c8eac0] Skipping 0 bytes of junk at 2446.
  
  [mp3 @ 0x1c8eac0] Estimating duration from bitrate, this may be inaccurate
  
  Input #1, mp3, from '/var/www/vhosts/site/httpdocs/uploads/tracks/2.mp3':
  
    Metadata:
  
      genre           : Other
  
    Duration: 00:05:44.19, start: 0.000000, bitrate: 320 kb/s
  
      Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
  
  [mp3 @ 0x1c9d640] Skipping 0 bytes of junk at 1044.
  
  Input #2, mp3, from '/var/www/vhosts/site/httpdocs/uploads/tracks/3.mp3':
  
    Duration: 00:05:44.08, start: 0.025057, bitrate: 320 kb/s
  
      Stream #2:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
  
      Metadata:
  
        encoder         : LAME3.98r
  
      Side data:
  
        replaygain: track gain - 3.400000, track peak - unknown, album gain - unknown, album peak - unknown,
  
  [mp3 @ 0x1cc2b80] Skipping 0 bytes of junk at 1044.
  
  Input #3, mp3, from '/var/www/vhosts/site/httpdocs/uploads/tracks/4.mp3':
  
    Duration: 00:05:44.08, start: 0.025057, bitrate: 320 kb/s
  
      Stream #3:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
  
      Metadata:
  
        encoder         : LAME3.98r
  
      Side data:
  
        replaygain: track gain - 12.100000, track peak - unknown, album gain - unknown, album peak - unknown,
  
  [Parsed_amerge_0 @ 0x1cc34e0] No channel layout for input 1
  
  [Parsed_amerge_0 @ 0x1cc34e0] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
  
  Output #0, mp3, to '/var/www/vhosts/site/httpdocs/uploads/mix.mp3':
  
    Metadata:
  
      TSSE            : Lavf56.40.101
  
      Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p (default)
  
      Metadata:
  
        encoder         : Lavc56.60.100 libmp3lame
  
  Stream mapping:
  
    Stream #0:0 (mp3) -> amerge:in0
  
    Stream #1:0 (mp3) -> amerge:in1
  
    amerge -> Stream #0:0 (libmp3lame)
  
  Press [q] to stop, [?] for help
  
  size=    2360kB time=00:05:44.03 bitrate=  56.2kbits/s
  
  video:0kB audio:2360kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.010468%

  Is there a way to solve this, or at least to know what the issue is ?

  Also, some people recommended sox, but I can’t figure how to install it on CentOS.

  Any other alternatives will also help.

  Thank you

• Python cv2 script that scans a giant image to a video. Raises error : Unknown C++ exception from OpenCV code

  26 avril 2022, par Nolrenea

  I wrote a script that scans a giant image to make a video. Normally I just post my scripts straight to my Code Review account, but this script is ugly, needs to be refactored, implements only horizontal scrolling and contains a bug that I can't get rid of.

  


  It is working but not perfect, I can't get the last line at the bottom of the image, with height of image_height % 1080. If I ignore it, the code is working fine, if I try to fix it, it throws exceptions.

  


  Example :

  


  Original image (Google Drive)

  


  Video Output (Google Drive)

  


  As you can see from the video, everything is working properly except the fact that I can't get the bottom line.

  


  Full working code

  


  ---

  


  import cv2
import numpy as np
import random
import rpack
from fractions import Fraction
from math import prod

def resize_guide(image_size, target_area):
    aspect_ratio = Fraction(*image_size).limit_denominator()
    horizontal = aspect_ratio.numerator
    vertical = aspect_ratio.denominator
    unit_length = (target_area/(horizontal*vertical))**.5
    return (int(horizontal*unit_length), int(vertical*unit_length))

fourcc = cv2.VideoWriter_fourcc(*'h264')
FRAME = np.zeros((1080, 1920, 3), dtype=np.uint8)

def new_frame():
    return np.ndarray.copy(FRAME)

def center(image):
    frame = new_frame()
    h, w = image.shape[:2]
    yoff = round((1080-h)/2)
    xoff = round((1920-w)/2)
    frame[yoff:yoff+h, xoff:xoff+w] = image
    return frame

def image_scanning(file, fps=60, pan_increment=64, horizontal_increment=8, fast_decrement=256):
    image = cv2.imread(file)
    height, width = image.shape[:2]
    assert width*height >= 1920*1080
    video_writer = cv2.VideoWriter(file+'.mp4', fourcc, fps, (1920, 1080))
    fit_height = True
    if height < 1080:
        width = width*1080/height
        image = cv2.resize(image, (width, 1080), interpolation = cv2.INTER_AREA)
    aspect_ratio = width / height
    zooming_needed = False
    if 4/9 <= aspect_ratio <= 16/9:
        new_width = round(width*1080/height)
        fit = cv2.resize(image, (new_width, 1080), interpolation = cv2.INTER_AREA)
        zooming_needed = True
    
    elif 16/9 < aspect_ratio <= 32/9:
        new_height = round(height*1920/width)
        fit = cv2.resize(image, (1920, new_height), interpolation = cv2.INTER_AREA)
        fit_height = False
        zooming_needed = True
    
    centered = center(fit)
    for i in range(fps):
        video_writer.write(centered)
    if fit_height:
        xoff = round((1920 - new_width)/2)
        while xoff:
            if xoff - pan_increment >= 0:
                xoff -= pan_increment
            else:
                xoff = 0
            frame = new_frame()
            frame[0:1080, xoff:xoff+new_width] = fit
            video_writer.write(frame)
    else:
        yoff = round((1080 - new_height)/2)
        while yoff:
            if yoff - pan_increment >= 0:
                yoff -= pan_increment
            else:
                yoff = 0
            frame = new_frame()
            frame[yoff:yoff+new_height, 0:1920] = fit
            video_writer.write(frame)
    
    if zooming_needed:
        if fit_height:
            width_1, height_1 = new_width, 1080
        else:
            width_1, height_1 = 1920, new_height
        new_area = width_1 * height_1
        original_area = width * height
        area_diff = original_area - new_area
        unit_diff = area_diff / fps
        for i in range(1, fps+1):
            zoomed = cv2.resize(image, resize_guide((width_1, height_1), new_area+unit_diff*i), interpolation=cv2.INTER_AREA)
            zheight, zwidth = zoomed.shape[:2]
            zheight = min(zheight, 1080)
            zwidth = min(zwidth, 1920)
            frame = new_frame()
            frame[0:zheight, 0:zwidth] = zoomed[0:zheight, 0:zwidth]
            video_writer.write(frame)
    y, x = 0, 0
    completed = False
    while y != height - 1080:
        x = 0
        while x != width - 1920:
            if x + horizontal_increment + 1920 <= width:
                x += horizontal_increment
                frame = image[y:y+1080, x:x+1920]
                video_writer.write(frame)
            else:
                x = width - 1920
                frame = image[y:y+1080, x:x+1920]
                for i in range(round(fps/3)):
                    video_writer.write(frame)
                if y == height - 1080:
                    completed = True
        while x != 0:
            if x - fast_decrement - 1920 >= 0:
                x -= fast_decrement
            else:
                x = 0
            frame = image[y:y+1080, x:x+1920]
            video_writer.write(frame)
        if y + 2160 <= height:
            y += 1080
        else:
            y = height - 1080
    cv2.destroyAllWindows()
    video_writer.release()
    del video_writer


  


  The above the the code needed to produce the example video. It is working but the bottom line is missing.

  


  Now if I change the last few lines to this :

  


          if y + 2160 <= height:
            y += 1080
        else:
            y = height - 1080
            x = 0
            while x != width - 1920:
                if x + horizontal_increment + 1920 <= width:
                    x += horizontal_increment
                    frame = image[y:y+1080, x:x+1920]
                    video_writer.write(frame)
    cv2.destroyAllWindows()
    video_writer.release()
    del video_writer


  


  I expect it to include the bottom line, but it just throws exceptions instead :

  


  OpenCV: FFMPEG: tag 0x34363268/&#x27;h264&#x27; is not supported with codec id 27 and format &#x27;mp4 / MP4 (MPEG-4 Part 14)&#x27;&#xA;OpenCV: FFMPEG: fallback to use tag 0x31637661/&#x27;avc1&#x27;&#xA;---------------------------------------------------------------------------&#xA;error                                     Traceback (most recent call last)&#xA; in <module>&#xA;----> 1 image_scanning("D:/collages/91f53ebcea2a.png")&#xA;&#xA; in image_scanning(file, fps, pan_increment, horizontal_increment, fast_decrement)&#xA;    122                     x &#x2B;= horizontal_increment&#xA;    123                     frame = image[y:y&#x2B;1080, x:x&#x2B;1920]&#xA;--> 124                     video_writer.write(frame)&#xA;    125     cv2.destroyAllWindows()&#xA;    126     video_writer.release()&#xA;&#xA;error: Unknown C&#x2B;&#x2B; exception from OpenCV code&#xA;</module>

  


  (If you can't get the example code working I can't help you, but I am using Python 3.9.10 x64 on Windows 10, and I have this file : "C :\Windows\System32\openh264-1.8.0-win64.dll", the '.avi' format generates video files with Gibibytes (binary unit, not SI Gigabyte) of size)

  


  How to get rid of the exception ?

  


• Errors while ffmpeg compiling

  10 mai 2012, par iSun

  I trying to compile ffmpeg through the following script, but I got errors while compiling : (Using windows 7 - android ndk 7rb and cygwin)

  s@s-PC /cygdrive/f/export/ffmpeg-0.8.10
  
  $ ./setup.sh
  
  F:/Compiler/android-ndk-r7b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/wind                                                                                                    ows/bin/arm-linux-androideabi-gcc is unable to create an executable file.
  
  C compiler test failed.
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solving the problem.
  
  ./setup.sh: line 48: --extra-cflags=: command not found
  
  ./setup.sh: line 51: --extra-ldflags=: command not found
  
  ./setup.sh: line 53: --extra-ldflags=: command not found
  
  Makefile:1: config.mak: No such file or directory
  
  libavutil/Makefile:1: libavutil/../config.mak: No such file or directory
  
  libavutil/../subdir.mak:96: warning: overriding recipe for target `libavutil/'
  
  libavutil/../subdir.mak:26: warning: ignoring old recipe for target `libavutil/'
  
  libavutil/../subdir.mak:96: warning: overriding recipe for target `libavutil/'
  
  libavutil/../subdir.mak:96: warning: ignoring old recipe for target `libavutil/'
  
  Makefile:239: /tests/fate.mak: No such file or directory
  
  Makefile:240: /tests/fate2.mak: No such file or directory
  
  Makefile:242: /tests/fate/aac.mak: No such file or directory
  
  Makefile:243: /tests/fate/als.mak: No such file or directory
  
  Makefile:244: /tests/fate/fft.mak: No such file or directory
  
  Makefile:245: /tests/fate/h264.mak: No such file or directory
  
  Makefile:246: /tests/fate/mp3.mak: No such file or directory
  
  Makefile:247: /tests/fate/vorbis.mak: No such file or directory
  
  Makefile:248: /tests/fate/vp8.mak: No such file or directory
  
  make: *** No rule to make target `/tests/fate/vp8.mak'.  Stop.
  
  Makefile:1: config.mak: No such file or directory
  
  libavutil/Makefile:1: libavutil/../config.mak: No such file or directory
  
  libavutil/../subdir.mak:96: warning: overriding recipe for target `libavutil/'
  
  libavutil/../subdir.mak:26: warning: ignoring old recipe for target `libavutil/'
  
  libavutil/../subdir.mak:96: warning: overriding recipe for target `libavutil/'
  
  libavutil/../subdir.mak:96: warning: ignoring old recipe for target `libavutil/'
  
  Makefile:239: /tests/fate.mak: No such file or directory
  
  Makefile:240: /tests/fate2.mak: No such file or directory
  
  Makefile:242: /tests/fate/aac.mak: No such file or directory
  
  Makefile:243: /tests/fate/als.mak: No such file or directory
  
  Makefile:244: /tests/fate/fft.mak: No such file or directory
  
  Makefile:245: /tests/fate/h264.mak: No such file or directory
  
  Makefile:246: /tests/fate/mp3.mak: No such file or directory
  
  Makefile:247: /tests/fate/vorbis.mak: No such file or directory
  
  Makefile:248: /tests/fate/vp8.mak: No such file or directory
  
  make: *** No rule to make target `/tests/fate/vp8.mak'.  Stop.

  Here is my script :

      #!/bin/bash
  
  
  
      export TMPDIR=C:/cygwin/tmp
  
  
  
      ANDROID_API=android-8
  
      export ANDROID_NDK=F:/Compiler/android-ndk-r7b
  
      export ANDROID_SDK=F:/Compiler/android-sdk
  
      SYSROOT=$ANDROID_NDK/platforms/$ANDROID_API/arch-arm
  
      ANDROID_BIN=$ANDROID_NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin
  
      CROSS_COMPILE=${ANDROID_BIN}/arm-linux-androideabi-
  
      export PATH=$PATH:$ANDROID_SDK/tools:$ANDROID_SDK/platform-tools
  
  
  
      export ARM_ROOT=$ANDROID_NDK
  
      export ARM_INC=$ARM_ROOT/platforms/android-5/arch-arm/usr/include
  
      export ARM_LIB=$ARM_ROOT/platforms/android-5/arch-arm/usr/lib
  
      export LIB_INC=${HOME}/include
  
      export LIB_LIB=${HOME}/lib
  
  
  
  
  
      CFLAGS=" -I$ARM_INC -fPIC -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fstack-protector -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__  -Wno-psabi -march=armv5te -mtune=xscale -msoft-float -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID  -Wa,--noexecstack -MMD -MP "
  
      LDFLAGS=" -nostdlib -Bdynamic  -Wl,--no-undefined -Wl,-z,noexecstack  -Wl,-z,nocopyreloc -Wl,-soname,/system/lib/libz.so -Wl,-rpath-link=$ARM_LIB,-dynamic-linker=/system/bin/linker -L$ARM_LIB -nostdlib $ARM_LIB/crtbegin_dynamic.o $ARM_LIB/crtend_android.o -lc -lm -ldl -lgcc "
  
  
  
      FLAGS="--target-os=linux 
  
      --enable-cross-compile 
  
      --cross-prefix=$CROSS_COMPILE 
  
      --arch=arm --prefix=$HOME 
  
      --disable-shared 
  
      --enable-static 
  
      --extra-libs=-static 
  
      --extra-cflags=--static 
  
      --enable-small 
  
      --disable-asm 
  
      --disable-yasm 
  
      --disable-amd3dnow 
  
      --disable-amd3dnowext 
  
      --disable-mmx 
  
      --disable-mmx2 
  
      --disable-sse 
  
      --disable-ssse3 
  
      --disable-indevs"
  
  
  
  
  
      export CFLAGS=$EXTRA_CFLAGS
  
      export LDFLAGS=$EXTRA_LDFLAGS
  
  
  
  
  
  ./configure $FLAGS 
  
  --extra-cflags="$CFLAGS" 
  
  --extra-ldflags="$LDFLAGS" \
  
  --cc="${CROSS_COMPILE}gcc 
  
  --sysroot=${SYSROOT}" 
  
  --extra-ldflags="$LDFLAGS" \
  
  --cxx="${CROSS_COMPILE}g++ --sysroot=${SYSROOT}" \
  
  --nm="${CROSS_COMPILE}nm" \
  
  --ar="${CROSS_COMPILE}ar"
  
  
  
  
  
  make clean
  
  make -j4 || exit 1
  
  make install || exit 1

  Any ideas ?