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• FFMPEG concat audio and videos produces only audio

  19 septembre 2019, par justaguytrynabuildawebsite

  Im trying to combine multiple video files with a single audio file. When using only videos without audio, it works fine but when adding a audio track to the beginning of the concat file i get the return below, and the output.mp4 becomes just audio with no video when previewing in browser. FFMPEG command

  ffmpeg -f concat -safe 0 -i /var/www/html/video_tool/edit/out/concat.txt -c copy -flags +global_header /var/www/html/video_tool/edit/out/output.mp4
  

  concat.txt

  #CONCAT FILE
  file '/var/www/html/video_tool/edit/audio/sound.mp3'
  file '/var/www/html/video_tool/edit/vids/frame_0.mp4'
  file '/var/www/html/video_tool/edit/vids/frame_1.mp4'
  file '/var/www/html/video_tool/edit/vids/frame_2.mp4'
  file '/var/www/html/video_tool/edit/vids/frame_3.mp4'
  

  Output

  ffmpeg version 4.1.3-0york1~16.04 Copyright (c) 2000-2019 the FFmpeg developers
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.11) 20160609
    configuration: --prefix=/usr --extra-version='0york1~16.04' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-nonfree --enable-libfdk-aac --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
    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
  [mp3 @ 0x5635174e08c0] Estimating duration from bitrate, this may be inaccurate
  Input #0, concat, from '/var/www/html/video_tool/edit/out/concat.txt':
    Duration: N/A, start: 0.000000, bitrate: 192 kb/s
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 192 kb/s
  Output #0, mp4, to '/var/www/html/video_tool/edit/out/output.mp4':
    Metadata:
      encoder         : Lavf58.20.100
      Stream #0:0: Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 192 kb/s
  Stream mapping:
    Stream #0:0 -> #0:0 (copy)
  Press [q] to stop, [?] for help
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5635174e38c0] Auto-inserting h264_mp4toannexb bitstream filter
  [mp4 @ 0x5635174e5080] Non-monotonous DTS in output stream 0:0; previous: 9897984, current: 8976; changing to 9897985. This may result in incorrect timestamps in the output file.
  [mp4 @ 0x5635174e5080] Non-monotonous DTS in output stream 0:0; previous: 9897985, current: 8977; changing to 9897986. This may result in incorrect timestamps in the output file.
  [mp4 @ 0x5635174e5080] Non-monotonous DTS in output stream 0:0; previous: 9897986, current: 8979; changing to 9897987. This may result in incorrect timestamps in the output file.
  [mp4 @ 0x5635174e5080] Non-monotonous DTS in output stream 0:0; previous: 9897987, current: 8980; changing to 9897988. This may result in incorrect timestamps in the output file.
  etc, etc...
  size=    5347kB time=00:03:44.44 bitrate= 195.1kbits/s speed=2.91e+03x    
  video:0kB audio:5311kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.664769%
  

• How to convert the format of the media source for exoplayer ?

  18 septembre 2019, par Dinu Nicolae

  Is it possible to convert the format of the media source when playing a video with exoplayer? I thought that I could use FFMPEG to convert the format, but I do not really know how exoplayer works and the problem is that the media source is not a file, but a stream. It is avi format, which unfortunately is not supported by exoplayer, and I could not find any working player for android that has avi support.

  I see there is a ffmpeg extension for exoplayer, but I do not know if that will solve my problem and I have no idea about NDK and compiling c++ for android and the instructions are very unclear. If someone could explain how to do it or give me a guide that would be nice. This is the link to the exoplayer extension: ffmpeg extension

• How to reduce video size with java/kotlin on Android ?

  18 septembre 2019, par Pablo DbSys

  I want reduce the video size at Android Studio and for upload to PlayStore needs to be compatible for 64 bits arquitecture, I tried before with ffmpeg and it compress mp4 succefully but take longer time and this solution with 3gp not include the audio. Theres another option or library to compress mp4 and 3gp with audio and video?

• I'm trying to build a video editing app for android [on hold]

  18 septembre 2019, par void

  I am trying to build a video editing app and i don't really have any idea to go about it, I've heard of tools like FFmpeg but don't know how to implement it

  trying to trim video. apply effects covert multiple pictures into videos record with camera.

• The audio disappears from 2/3 of the video after speeding up with ffmpeg

  18 septembre 2019, par AlexZheda

  I have tried to speed up a video file (with the audio stream) 8 times with ffmpeg using the script below. All works well that from a 50 hour video I get a 7-hour video with the audio sped up also, yet in the resulting file the audio lasts for just over 2 hours and silences after that, i.e. there video without audio.

  ffmpeg -i video.mp4 -filter_complex "[0:v]setpts=0.5*PTS,setpts=0.5*PTS,setpts=0.5*PTS[v];[0:a]atempo=2.0,atempo=2.0,atempo=2.0[a]" -map "[v]" -map "[a]" video_x8.mp4
  

  EDIT: video.mp4 file

  video_x8.mp4 file (naming is different for the clear picture)

  EDIT 1. Here are the full 100MB logs. https://gofile.io/?c=L0Au2e

  EDIT 2: Thank you Gyan. But could you please help me write it in 1 command so that it works in 1 go?