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Sur d’autres sites (9116)

  • FFMpeg : merge images with audio for specific duration

    10 juillet 2018, par Killer

    I have been working on FFMpeg from past 7 days. I am required to create a video where I need to perform following :

    1. Concat few images into video picked from android storage.
    2. Add a music file [same picked from android storage].
    3. Set Duration per image to be shown in the video. e.g. if 3 images are picked then total duration of video should be 3*duration choosen by user.

    What I have done so far.

    I am using implementation 'nl.bravobit:android-ffmpeg:1.1.5' for the FFmpeg prebuild binaries.
    Following is the command that has been used to concatenation the images and set the duration :

    ffmpeg -r 1/duration_selected_by_user -f concat -safe 0 -i path_of_concat_file.txt -c:v libx264 -profile:v high -crf 20 -pix_fmt yuv420p path_of_output_video_file.mp4

    Note :

    1. By adding the duration chosen by a user as frame rate I am able to set the duration of each image to be shown.
    2. Concat work well and images are merged to for the video.

    Problem :
    When I try to add audio in the same process, progress run for a long time even for small audio by using the following command :

    ffmpeg -r 1/duration_selected_by_user -i path_of_audio_file.mp3 -f concat -safe 0 -i path_of_concat_file.txt -c:v libx264 -profile:v high -crf 20 -pix_fmt yuv420p path_of_output_video_file.mp4

    It looks like there is some issue in command as I am not much familiar and experienced with the technology. How can I improve the performance of merging images and audio to get the better results ?

    Important Links related to context :

    https://github.com/bravobit/FFmpeg-Android

  • How to buid ffmpeg with android-ndk-r10d in windows

    26 avril 2015, par Hossein

    In my application user can selects several images and create movie(mp4) with those images, For this reason i want to use ffmpeg library.
    i have searched more than 2 days but did not find a good tutorial for build ffmpeg with ndk in windows.

    can any body describe me, how to do that ?(if you have any link, please share me)

    i used roman10 tutorial and this is what i do :
    1-i have decompressed "ffmpeg-2.6.2" folder into "android-ndk-r10d/sources".

    2-i have created "build_android.sh" file into "ffmpeg-2.6.2" folder and these are my build_android.sh codes :

    #!/bin/bash
    
NDK=C:/Users/HAKHASIN/Desktop/android-ndk-r10d
    

    
SYSROOT=$NDK/platforms/android-9/arch-arm/
    

    
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/windows-x86_64
    

    
function build_one
    

    
{
    

    
./configure \
    

    
--prefix=$PREFIX \
    

    
--enable-shared \
    

    
--disable-static \
    

    
--disable-doc \
    

    
--disable-ffmpeg \
    

    
--disable-ffplay \
    

    
--disable-ffprobe \
    

    
--disable-ffserver \
    

    
--disable-avdevice \
    

    
--disable-doc \
    

    
--disable-symver \
    

    
--cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
    

    
--target-os=linux \
    

    
--arch=arm \
    

    
--enable-cross-compile \
    

    
--sysroot=$SYSROOT \
    

    
--extra-cflags="-Os -fpic $ADDI_CFLAGS" \
    

    
--extra-ldflags="$ADDI_LDFLAGS" \
    

    
$ADDITIONAL_CONFIGURE_FLAG
    

    
make clean
    

    
make
    

    
make install
    

    
}
    

    
CPU=arm
    

    
PREFIX=$(pwd)/android/$CPU 
    

    
ADDI_CFLAGS="-marm"
    

    
build_one

    3- when write "sudo chmod +x build_android.sh" and "./build_android.sh" commands in cygwin, it not work correctly

    enter image description here

    please guide me

  • ffmpeg trying to hardcode subs using -c:s mov_text but fails

    3 décembre 2014, par The All Powerful

    please bear with me ; I’m still learning the intricacies of ffmpeg and have hit a problem with subtitles.

    So, I am trying to change the container of a video from mkv to mp4, and simultaneously hardcode the subtitles onto the video so that my Playstation will accept them.

    The mkv is structured as follows :

    ffmpeg version git-2013-09-23-34b429d Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Sep 23 2013 18:16:42 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
    
  configuration: --prefix=/home/seb/ffmpeg_build --extra-cflags=-I/home/seb/ffmpeg_build/include --extra-ldflags=-L/home/seb/ffmpeg_build/lib --bindir=/home/seb/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
    
  libavutil      52. 46.100 / 52. 46.100
    
  libavcodec     55. 33.100 / 55. 33.100
    
  libavformat    55. 18.102 / 55. 18.102
    
  libavdevice    55.  3.100 / 55.  3.100
    
  libavfilter     3. 87.100 /  3. 87.100
    
  libswscale      2.  5.100 /  2.  5.100
    
  libswresample   0. 17.103 /  0. 17.103
    
  libpostproc    52.  3.100 / 52.  3.100
    
[matroska,webm @ 0xa52ce60] Could not find codec parameters for stream 2 (Subtitle: hdmv_pgs_subtitle): unspecified size
    
Consider increasing the value for the 'analyzeduration' and 'probesize' options
    
Input #0, matroska,webm, from 'entirely-innocent-video.mkv':
    
  Metadata:
    
    creation_time   : 2014-11-15 09:27:00
    
  Duration: 02:10:24.29, start: 0.000000, bitrate: 3838 kb/s
    
    <--BLAH BLAH BLAH CHAPTERS -->
    
    Stream #0:0(eng): Video: h264 (High), yuv420p(tv, bt709), 1280x690 [SAR 1:1 DAR 128:69], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    
    Metadata:
    
      BPS             : 3196139
    
      BPS-eng         : 3196139
    
      DURATION        : 02:10:24.233000000
    
      DURATION-eng    : 02:10:24.233000000
    
      NUMBER_OF_FRAMES: 187594
    
      NUMBER_OF_FRAMES-eng: 187594
    
      NUMBER_OF_BYTES : 3125917529
    
      NUMBER_OF_BYTES-eng: 3125917529
    
      _STATISTICS_WRITING_APP: mkvmerge v7.3.0 ('Nouages') 32bit built on Oct 22 2014 18:44:01
    
      _STATISTICS_WRITING_APP-eng: mkvmerge v7.3.0 ('Nouages') 32bit built on Oct 22 2014 18:44:01
    
      _STATISTICS_WRITING_DATE_UTC: 2014-11-15 09:27:00
    
      _STATISTICS_WRITING_DATE_UTC-eng: 2014-11-15 09:27:00
    
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
    Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 640 kb/s (default)
    
    Metadata:
    
      BPS             : 640000
    
      BPS-eng         : 640000
    
      DURATION        : 02:10:24.288000000
    
      DURATION-eng    : 02:10:24.288000000
    
      NUMBER_OF_FRAMES: 244509
    
      NUMBER_OF_FRAMES-eng: 244509
    
      NUMBER_OF_BYTES : 625943040
    
      NUMBER_OF_BYTES-eng: 625943040
    
      _STATISTICS_WRITING_APP: mkvmerge v7.3.0 ('Nouages') 32bit built on Oct 22 2014 18:44:01
    
      _STATISTICS_WRITING_APP-eng: mkvmerge v7.3.0 ('Nouages') 32bit built on Oct 22 2014 18:44:01
    
      _STATISTICS_WRITING_DATE_UTC: 2014-11-15 09:27:00
    
      _STATISTICS_WRITING_DATE_UTC-eng: 2014-11-15 09:27:00
    
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
    Stream #0:2(eng): Subtitle: hdmv_pgs_subtitle (default) (forced)
    
    Metadata:
    
      BPS             : 840
    
      BPS-eng         : 840
    
      DURATION        : 01:40:03.622000000
    
      DURATION-eng    : 01:40:03.622000000
    
      NUMBER_OF_FRAMES: 252
    
      NUMBER_OF_FRAMES-eng: 252
    
      NUMBER_OF_BYTES : 630808
    
      NUMBER_OF_BYTES-eng: 630808
    
      _STATISTICS_WRITING_APP: mkvmerge v7.3.0 ('Nouages') 32bit built on Oct 22 2014 18:44:01
    
      _STATISTICS_WRITING_APP-eng: mkvmerge v7.3.0 ('Nouages') 32bit built on Oct 22 2014 18:44:01
    
      _STATISTICS_WRITING_DATE_UTC: 2014-11-15 09:27:00
    
      _STATISTICS_WRITING_DATE_UTC-eng: 2014-11-15 09:27:00
    
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES

    I then use the following command :

    ffmpeg -i entirely-innocent-video -c:v copy -c:a copy -c:s mov_text entirely-innocent-video.mp4

    Which as far as I can see should re-code the video, leaving the audio and video untouched, but hardcode in the subtitles... But it doesn’t... It fails with the following message :

    Error while opening encoder for output stream #0:2 - maybe incorrect parameters such as bit_rate, rate, width or height

    And I just can’t work out why ! I’ve tried all sorts of permutations on the -c:s mov_text command but just keep getting error messages !

    At a guess I’d say it has something to do with this message :

    [matroska,webm @ 0xa52ce60] Could not find codec parameters for stream 2 (Subtitle: hdmv_pgs_subtitle): unspecified size
    
    Consider increasing the value for the 'analyzeduration' and 'probesize' options

    But I’m just not experienced enough with ffmpeg to know where to start doing anything about it...

    Can any of you clever experienced people help me unravel what’s going on ? :)

    Thanks !

    Seb

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