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• Crop Videos & Reduce Quickly on Mobile with or w/o FFMpeg (Flutter)

  11 mai 2021, par Haidar Hammoud

  Cropping, modifying quality, and other seemingly simple edits applied to videos using FFMpeg take between 30 to 60 seconds for a 15 second long video.

  


  Apps like Snapchat, Instagram, TikTok, WhatsApp, and Twitter are able to nearly instantly edit a video file with quality modifications, videos concatenated together, image overlays applied over every frame, and cropping. This is evident from the fact that videos can be viewed by the receivers within seconds of them being sent with all the modifications applied.

  


  Are there any reliable ways to achieve the same speeds (0.5 - 1.5 seconds) for video editing on mobile using Flutter ? FFMpeg has everything I need but just runs very slowly. Is there a way to speed it up ?

  


• lavfi/dnn_backend_tensorflow : support detect model

  6 mai 2021, par Ting Fu

  lavfi/dnn_backend_tensorflow : support detect model
  Signed-off-by : Ting Fu <ting.fu@intel.com>
  

  • [DH] libavfilter/dnn/dnn_backend_tf.c
  • [DH] libavfilter/vf_dnn_detect.c

• ffmpeg video merging issues for videos recorded from andriod mobile phone

  14 avril 2021, par Nishit Modi

  Following is the command I'm using :

  


  sudo ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex "[1]tpad=start_mode=clone:start_duration=15[tr];[0][tr]xstack=inputs=2:layout=0_0|w0_0[v];[1:a]adelay=15s:all=true[a1];[0:a][a1]amix=inputs=2[a]" -map "[v]" -map "[a]" output.mp4


  


  It took a couple of hours to merge the videos. Original videos are 6 MBs in size. Merged video is approx 2 GB in size.

  


  It is working fine with videos recorded from the iphone.

  


  Update :
The issue is regarding different fps in different videos. If two videos are of different fps, then it is taking too long and eventually break.

  


  Full log :

  


  ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex "[1]tpad=start_mode=clone:start_duration=15[tr];[0][tr]xstack=inputs=2:layout=0_0|w0_0[v];[1:a]adelay=15s:all=true[a1];[0:a][a1]amix=inputs=2[a]" -map "[v]" -map "[a]" output_ia_2.mp4
    ffmpeg version 4.3.2-0york0~16.04 Copyright (c) 2000-2021 the FFmpeg developers
      built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
      configuration: --prefix=/usr --extra-version='0york0~16.04' --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-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-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --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-opencl --enable-opengl --enable-sdl2 --enable-libzimg --enable-pocketsphinx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
      libavutil      56. 51.100 / 56. 51.100
      libavcodec     58. 91.100 / 58. 91.100
      libavformat    58. 45.100 / 58. 45.100
      libavdevice    58. 10.100 / 58. 10.100
      libavfilter     7. 85.100 /  7. 85.100
      libavresample   4.  0.  0 /  4.  0.  0
      libswscale      5.  7.100 /  5.  7.100
      libswresample   3.  7.100 /  3.  7.100
      libpostproc    55.  7.100 / 55.  7.100
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '97FD4344-23C3-4668-AA40-E5E724338352-3149-0000018389D9630F.mp4':
      Metadata:
        major_brand     : qt  
        minor_version   : 0
        compatible_brands: qt  
        creation_time   : 2021-04-09T00:43:28.000000Z
      Duration: 00:00:15.03, start: 0.000000, bitrate: 10342 kb/s
        Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 226 kb/s (default)
        Metadata:
          creation_time   : 2021-04-09T00:43:28.000000Z
          handler_name    : Core Media Audio
        Stream #0:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709), 720x1280, 10111 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default)
        Metadata:
          creation_time   : 2021-04-09T00:43:28.000000Z
          handler_name    : Core Media Video
          encoder         : H.264
    Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'android_ritesh.mp4':
      Metadata:
        major_brand     : mp42
        minor_version   : 0
        compatible_brands: isommp42
        creation_time   : 2021-04-13T06:39:16.000000Z
        com.android.version: 10
      Duration: 00:00:09.59, start: 0.000000, bitrate: 5288 kb/s
        Stream #1:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, unknown/bt470bg/unknown), 720x1280, 5152 kb/s, SAR 1:1 DAR 9:16, 17.31 fps, 59.94 tbr, 90k tbn, 180k tbc (default)
        Metadata:
          creation_time   : 2021-04-13T06:39:16.000000Z
          handler_name    : VideoHandle
        Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 131 kb/s (default)
        Metadata:
          creation_time   : 2021-04-13T06:39:16.000000Z
          handler_name    : SoundHandle
    Stream mapping:
      Stream #0:0 (aac) -> amix:input0
      Stream #0:1 (h264) -> xstack:input0
      Stream #1:0 (h264) -> tpad
      Stream #1:1 (aac) -> adelay
      xstack -> Stream #0:0 (libx264)
      amix -> Stream #0:1 (aac)
    Press [q] to stop, [?] for help
    [swscaler @ 0x5628692bd340] deprecated pixel format used, make sure you did set range correctly
    [mp4 @ 0x562868aa7dc0] Frame rate very high for a muxer not efficiently supporting it.
    Please consider specifying a lower framerate, a different muxer or -vsync 2
    [libx264 @ 0x562868af2400] MB rate (648000000) > level limit (16711680)
    [libx264 @ 0x562868af2400] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
    [libx264 @ 0x562868af2400] profile High, level 6.2
    [libx264 @ 0x562868af2400] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=6 lookahead_threads=1 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_ia_2.mp4':
      Metadata:
        major_brand     : qt  
        minor_version   : 0
        compatible_brands: qt  
        encoder         : Lavf58.45.100
        Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc, progressive), 1440x1280, q=-1--1, 90k tbn, 90k tbc (default)
        Metadata:
          encoder         : Lavc58.91.100 libx264
        Side data:
          cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
        Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 69 kb/s (default)
        Metadata:
          encoder         : Lavc58.91.100 aac
    More than 1000 frames duplicated      0kB time=00:00:00.00 bitrate=N/A speed=   0x    
More than 10000 frames duplicated   4352kB time=00:00:00.09 bitrate=358592.3kbits/s dup=8991 drop=0 speed=0.00141x    
frame=15000 fps=131 q=33.0 size=    7680kB time=00:00:00.16 bitrate=378802.6kbits/s dup=14985 drop=0 speed=0.00145x