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• How to download a part of mp3 from server ?

  20 août 2020, par Sharukh Mohammed

  Use Case

  


  My use case is roughly equal to, adding a 15-second mp3 file to a 1 min video. All transcoding merging part will be done by FFmpeg-android so that's not the concern right now.

  


  The flow is as follows

  


  

  • User can select any 15 seconds (ExoPlayer-streaming) of an mp3 (considering 192Kbps/44.1KHz of 3mins = up to 7MB)

  


  • Then download ONLY the 15 second part and add it to the video's audio stream. (using FFmpeg)

  


  • Use the obtained output

  


  


  Tried solutions

  


  


  • Extracting fragment of audio from a url

    


    RANGE_REQUEST - I have replicated the exact same algorithm/formula in Kotlin using the exact sample file provided. But the output is not accurate (± 1.5 secs * c) where c is proportional to startTime

    


  


  • How to crop a mp3 from x to x+n using ffmpeg ?

    


    FFMPEG_SS - This works flawlessly with remote URLs as input, but there are two downsides,

    


    

    1. as startTime increases, the size of downloaded bytes are closer to the actual size of the mp3.

    


    2. ffmpeg-android does not support network requests module (at least the way we complied)

    


    


  


  


  So above two solutions have not been fruitful and currently, I am downloading the whole file and trimming it locally, which is definitely a bad UX.
I wonder how Instagram's music addition to story feature works because that's close to what I wanted to implement.

  


• How to put video on top of overlay using FFmpeg ?

  23 juillet 2020, par user3058763

  How to merge a video and an image (or a black overlay) to get the video on top ?

  


  Input video is already prepared for this (its maximum width/height is 1920x1080) and needs to stay at original size.

  


  This is how it should look like :


  


  orange is an overlay/image (1920x1080px),
pink is a video on top of it (and centered)

  


  The best shot so far I've got :

  


  ffplay -vf "pad=1920:1080:(ow-iw)/2:(oh-ih)/2" input.mp4


  


  this most likely works, but I can't save the image to check.

  


  But this does nothing to the video :

  


  ffmpeg -i input.mp4 -vf "pad=1920:1080:(ow-iw)/2:(oh-ih)/2" output.mp4


  


  Bonus points if you know how to put an image instead of black overlay.
Thank you !

  


  Full logs of the command (output video remains the same resolution as input) :

  


  ffmpeg -i input.mp4 -vf "pad=1920:1080:(ow-iw)/2:(oh-ih)/2" output.mp4

ffmpeg version git-2020-07-21-b5f1e05 Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD-b5f1e05_2 --enable-shared --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libaom --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-demuxer=dash --disable-libjack --disable-indev=jack --enable-opencl --enable-videotoolbox --disable-htmlpages --enable-libbs2b --enable-libcaca --enable-libfdk-aac --enable-libgsm --enable-libmodplug --enable-libopenh264 --enable-libopenjpeg --enable-librav1e --enable-librsvg --enable-librtmp --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtesseract --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libwavpack --enable-libwebp --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-openssl --enable-nonfree --enable-decklink --extra-cflags=-I/usr/local/include --extra-ldflags=-L/usr/local/include --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb
  libavutil      56. 55.100 / 56. 55.100
  libavcodec     58. 97.100 / 58. 97.100
  libavformat    58. 49.100 / 58. 49.100
  libavdevice    58. 11.101 / 58. 11.101
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.49.100
  Duration: 00:00:20.70, start: 0.000000, bitrate: 1068 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 9:20 DAR 4:5], 1051 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : Bento4 Video Handler
    Stream #0:1(und): Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
File 'output.mp4' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (mp3 (mp3float) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x7fee16819000] using SAR=9/20
[libx264 @ 0x7fee16819000] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7fee16819000] profile High, level 4.0, 4:2:0, 8-bit
[libx264 @ 0x7fee16819000] 264 - core 160 r3011 cde9a93 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.49.100
    Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 9:20 DAR 4:5], q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
    Metadata:
      handler_name    : Bento4 Video Handler
      encoder         : Lavc58.97.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      encoder         : Lavc58.97.100 aac
frame=  621 fps= 38 q=-1.0 Lsize=    7148kB time=00:00:20.60 bitrate=2842.6kbits/s speed=1.26x    
video:7138kB audio:1kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.139421%
[libx264 @ 0x7fee16819000] frame I:5     Avg QP:20.79  size: 38334
[libx264 @ 0x7fee16819000] frame P:255   Avg QP:23.03  size: 19776
[libx264 @ 0x7fee16819000] frame B:361   Avg QP:25.79  size:  5745
[libx264 @ 0x7fee16819000] consecutive B-frames:  5.3% 48.6%  8.7% 37.4%
[libx264 @ 0x7fee16819000] mb I  I16..4: 27.2% 69.6%  3.3%
[libx264 @ 0x7fee16819000] mb P  I16..4: 10.6% 19.1%  0.4%  P16..4: 36.9%  4.7%  1.3%  0.0%  0.0%    skip:26.9%
[libx264 @ 0x7fee16819000] mb B  I16..4:  0.9%  1.6%  0.0%  B16..8: 22.5%  1.9%  0.2%  direct: 0.5%  skip:72.4%  L0:46.0% L1:51.5% BI: 2.5%
[libx264 @ 0x7fee16819000] 8x8 transform intra:63.7% inter:94.6%
[libx264 @ 0x7fee16819000] coded y,uvDC,uvAC intra: 28.2% 36.6% 1.0% inter: 5.6% 6.3% 0.0%
[libx264 @ 0x7fee16819000] i16 v,h,dc,p:  7% 31%  6% 56%
[libx264 @ 0x7fee16819000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 37% 22%  2%  4%  2%  7%  1%  3%
[libx264 @ 0x7fee16819000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 38% 13%  2%  8%  4% 10%  2%  2%
[libx264 @ 0x7fee16819000] i8c dc,h,v,p: 70% 20%  8%  3%
[libx264 @ 0x7fee16819000] Weighted P-Frames: Y:0.4% UV:0.0%
[libx264 @ 0x7fee16819000] ref P L0: 58.3%  7.7% 26.8%  7.3%  0.0%
[libx264 @ 0x7fee16819000] ref B L0: 85.5% 12.3%  2.1%
[libx264 @ 0x7fee16819000] ref B L1: 97.8%  2.2%
[libx264 @ 0x7fee16819000] kb/s:2824.45
[aac @ 0x7fee1681a800] Qavg: 65536.000


  


• Creating a timelapse from a directory of jpgs

  26 juillet 2020, par Casey Davis

  I'm using this code to create a timelapse from a directory of images. My directory has about 1600 jpgs in it that all start with the date in this format 2020-03-01-time.jpg, 2020-03-02-time-name.jpg, etc. Sorting alphabetically works just fine. It runs, but it seems to only get through a few hundred photos and makes a 3 second long mp4. I'm not sure what I'm doing wrong.

  


  I'm not opposed to moving to python or anything else. Eventually I'll need to pass some parameters in here and I'll attempt to automate it and ftp the output to a webserver.

  


  Here is the command :

  


  ffmpeg -r 24 -pattern_type glob -i '*.jpg' -s hd1080 -vcodec libx264 timelapse.mp4


  


  Here is the output :

  


  ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, image2, from '*.jpg':
  Duration: 00:01:06.32, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
File 'timelapse.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x55a43cfb1d00] using SAR=1/1
[libx264 @ 0x55a43cfb1d00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x55a43cfb1d00] profile High, level 4.0
[libx264 @ 0x55a43cfb1d00] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=20 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'timelapse.mp4':
  Metadata:
    encoder         : Lavf57.83.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 20 fps, 10240 tbn, 20 tbc
    Metadata:
      encoder         : Lavc57.107.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame=   72 fps= 11 q=-1.0 Lsize=   10663kB time=00:00:03.45 bitrate=25318.0kbits/s speed=0.507x    
video:10661kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.015737%
[libx264 @ 0x55a43cfb1d00] frame I:5     Avg QP:23.69  size:223467
[libx264 @ 0x55a43cfb1d00] frame P:33    Avg QP:26.52  size:139314
[libx264 @ 0x55a43cfb1d00] frame B:34    Avg QP:28.49  size:152989
[libx264 @ 0x55a43cfb1d00] consecutive B-frames: 33.3%  8.3%  8.3% 50.0%
[libx264 @ 0x55a43cfb1d00] mb I  I16..4:  2.2% 96.6%  1.2%
[libx264 @ 0x55a43cfb1d00] mb P  I16..4:  2.1% 78.8%  1.5%  P16..4:  9.4%  4.7%  2.6%  0.0%  0.0%    skip: 0.8%
[libx264 @ 0x55a43cfb1d00] mb B  I16..4:  1.1% 20.4%  2.3%  B16..8: 27.6% 13.7%  5.3%  direct:22.7%  skip: 6.9%  L0:33.5% L1:32.2% BI:34.3%
[libx264 @ 0x55a43cfb1d00] 8x8 transform intra:93.8% inter:86.5%
[libx264 @ 0x55a43cfb1d00] coded y,uvDC,uvAC intra: 91.5% 66.0% 17.4% inter: 77.7% 58.7% 2.2%
[libx264 @ 0x55a43cfb1d00] i16 v,h,dc,p: 13% 56%  3% 28%
[libx264 @ 0x55a43cfb1d00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 20% 39%  4%  3%  3%  4%  4%  8%
[libx264 @ 0x55a43cfb1d00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 28% 12%  5%  7%  7%  6%  7%  8%
[libx264 @ 0x55a43cfb1d00] i8c dc,h,v,p: 49% 29% 19%  3%
[libx264 @ 0x55a43cfb1d00] Weighted P-Frames: Y:30.3% UV:24.2%
[libx264 @ 0x55a43cfb1d00] ref P L0: 48.2% 17.7% 17.7% 13.3%  3.2%
[libx264 @ 0x55a43cfb1d00] ref B L0: 83.2% 14.2%  2.5%
[libx264 @ 0x55a43cfb1d00] ref B L1: 93.8%  6.2%
[libx264 @ 0x55a43cfb1d00] kb/s:24258.47