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  • FFMpeg is slow on Android [duplicate]

    28 juin 2017, par Oleg Filimonov

    This question already has an answer here :

    I’m using this library : https://github.com/WritingMinds/ffmpeg-android

    Executing this command :

    ffmpeg -y -i video.mp4 -ignore_loop 0 -i overlay.gif -filter_complex `
    
>> "[0][1]overlay=x=mod((1080/4 + sin(t)*1080/4)\,1920):y=mod(t*300\,1080):shortest=1[res];`
    
>> [res][1]overlay=x=mod((200*1 + 1080/4 - sin(2*t)*1080/4)\,1920):y=mod(100 + t*300\,1080):shortest=1[res];`
    
>> [res][1]overlay=x=mod((200*2 + 1080/4 - sin(-90 + t/2)*1080/4)\,1920):y=mod(150 + t*250\,1080):shortest=1[res];`
    
>> [res][1]overlay=x=mod((200*3 + 1080/4 - sin(90 + 3*t)*1080/4)\,1920):y=mod(200 + t*100\,1080):shortest=1[res];`
    
>> [res][1]overlay=x=mod((200*4 + 1080/4 - sin(180 + t)*1080/4)\,1920):y=mod(t*250\,1080):shortest=1[res];`
    
>> [res][1]overlay=x=mod((200*5 + 1080/4 - sin(-180 + t)*1080/4)\,1920):y=mod(t*100\,1080):shortest=1[res];`
    
>> [res][1]overlay=x=mod((200*6 + 1080/4 - sin(2*t)*1080/4)\,1920):y=100 + mod(100 + t*300\,1080):shortest=1[res]`
    
>> " -map "[res]" -preset ultrafast out.mp4

    (Basically add a bunch of animated overlays to the video)

    On PC this command takes about a second to execute (render speed is about 278 fps). But on Android device with Snapdragon 821 it takes about 10 seconds (about 30 fps).

    The curious thing is that whenever command is executing on PC, CPU load is around 90%, but on Android it’s less than 1% (see screenshot : initial spike is UI stuff plus loading binaries, afterwards ffmpeg was executing until 10 second mark)

    enter image description here

    I tried executing the same command, but writing to /dev/null
    instead of the file :

    ffmpeg -y -i video.mp4 -ignore_loop 0 -i overlay.gif -filter_complex `
    
>> "[0][1]overlay=x=mod((1080/4 + sin(t)*1080/4)\,1920):y=mod(t*300\,1080):shortest=1[res];`
    
>> [res][1]overlay=x=mod((200*1 + 1080/4 - sin(2*t)*1080/4)\,1920):y=mod(100 + t*300\,1080):shortest=1[res];`
    
>> [res][1]overlay=x=mod((200*2 + 1080/4 - sin(-90 + t/2)*1080/4)\,1920):y=mod(150 + t*250\,1080):shortest=1[res];`
    
>> [res][1]overlay=x=mod((200*3 + 1080/4 - sin(90 + 3*t)*1080/4)\,1920):y=mod(200 + t*100\,1080):shortest=1[res];`
    
>> [res][1]overlay=x=mod((200*4 + 1080/4 - sin(180 + t)*1080/4)\,1920):y=mod(t*250\,1080):shortest=1[res];`
    
>> [res][1]overlay=x=mod((200*5 + 1080/4 - sin(-180 + t)*1080/4)\,1920):y=mod(t*100\,1080):shortest=1[res];`
    
>> [res][1]overlay=x=mod((200*6 + 1080/4 - sin(2*t)*1080/4)\,1920):y=100 + mod(100 + t*300\,1080):shortest=1[res]`
    
>> " -map "[res]" -preset ultrafast -f null /dev/null

    This reduced time by 3 seconds.

    I also tried replacing gif overlay with png overlay, but speed didn’t improve significantly.

    Here’s log of the command execution on Android :

    ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 4.8 (GCC)
    
  configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
    
  libavutil      55. 17.103 / 55. 17.103
    
  libavcodec     57. 24.102 / 57. 24.102
    
  libavformat    57. 25.100 / 57. 25.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 31.100 /  6. 31.100
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/com.example.user.proofofconcept/files/in_10s.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 2017-06-27 18:07:54
    
  Duration: 00:00:10.47, start: 0.000000, bitrate: 14043 kb/s
    
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuvj420p(pc, smpte170m), 1280x720, 13971 kb/s, 29.86 fps, 30.01 tbr, 90k tbn, 180k tbc (default)
    
    Metadata:
    
      creation_time   : 2017-06-27 18:07:53
    
      handler_name    : VideoHandle
    
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 96 kb/s (default)
    
    Metadata:
    
      creation_time   : 2017-06-27 18:07:54
    
      handler_name    : SoundHandle
    
Input #1, gif, from '/data/user/0/com.example.user.proofofconcept/files/overlay.gif':
    
  Duration: N/A, bitrate: N/A
    
    Stream #1:0: Video: gif, bgra, 130x98, 6.17 fps, 4.92 tbr, 100 tbn, 100 tbc
    
[swscaler @ 0xeddb3000] deprecated pixel format used, make sure you did set range correctly
    
[libx264 @ 0xee1fdc00] using cpu capabilities: none!
    
[libx264 @ 0xee1fdc00] profile Constrained Baseline, level 3.2
    
[libx264 @ 0xee1fdc00] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
    
Output #0, mp4, to '/storage/emulated/0/temp/out.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.25.100
    
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x720, q=-1--1, 30.01 fps, 90k tbn, 30.01 tbc (default)
    
    Metadata:
    
      encoder         : Lavc57.24.102 libx264
    
    Side data:
    
      unknown side data type 10 (24 bytes)
    
Stream mapping:
    
  Stream #0:0 (h264) -> overlay:main
    
  Stream #1:0 (gif) -> overlay:overlay
    
  Stream #1:0 (gif) -> overlay:overlay
    
  Stream #1:0 (gif) -> overlay:overlay
    
  Stream #1:0 (gif) -> overlay:overlay
    
  Stream #1:0 (gif) -> overlay:overlay
    
  Stream #1:0 (gif) -> overlay:overlay
    
  Stream #1:0 (gif) -> overlay:overlay
    
  overlay -> Stream #0:0 (libx264)
    
Press [q] to stop, [?] for help
    
frame=   16 fps=0.0 q=24.0 size=     227kB time=00:00:00.29 bitrate=6210.2kbits/s dup=2 drop=0 speed=0.56x    
    
frame=   29 fps= 28 q=24.0 size=     451kB time=00:00:00.73 bitrate=5042.1kbits/s dup=2 drop=0 speed=0.707x    
    
frame=   40 fps= 26 q=24.0 size=     637kB time=00:00:01.09 bitrate=4744.5kbits/s dup=2 drop=0 speed=0.71x    
    
frame=   57 fps= 28 q=24.0 size=     903kB time=00:00:01.66 bitrate=4441.3kbits/s dup=2 drop=0 speed=0.812x    
    
frame=   75 fps= 29 q=24.0 size=    1186kB time=00:00:02.26 bitrate=4288.0kbits/s dup=2 drop=0 speed=0.885x    
    
frame=   94 fps= 31 q=24.0 size=    1456kB time=00:00:02.89 bitrate=4113.4kbits/s dup=2 drop=0 speed=0.945x    
    
frame=  113 fps= 32 q=25.0 size=    1780kB time=00:00:03.53 bitrate=4127.3kbits/s dup=2 drop=0 speed=0.985x    
    
frame=  131 fps= 32 q=24.0 size=    2101kB time=00:00:04.13 bitrate=4165.9kbits/s dup=2 drop=0 speed=1.01x    
    
frame=  150 fps= 33 q=24.0 size=    2461kB time=00:00:04.76 bitrate=4231.2kbits/s dup=2 drop=0 speed=1.03x    
    
frame=  165 fps= 32 q=24.0 size=    2721kB time=00:00:05.26 bitrate=4234.1kbits/s dup=2 drop=0 speed=1.03x    
    
frame=  185 fps= 33 q=24.0 size=    3028kB time=00:00:05.93 bitrate=4182.4kbits/s dup=2 drop=0 speed=1.05x    
    
frame=  205 fps= 33 q=24.0 size=    3329kB time=00:00:06.59 bitrate=4133.3kbits/s dup=2 drop=0 speed=1.07x    
    
frame=  224 fps= 34 q=24.0 size=    3610kB time=00:00:07.23 bitrate=4089.7kbits/s dup=2 drop=0 speed=1.08x    
    
frame=  243 fps= 34 q=24.0 size=    3901kB time=00:00:07.86 bitrate=4063.3kbits/s dup=2 drop=0 speed=1.09x    
    
frame=  264 fps= 34 q=24.0 size=    4297kB time=00:00:08.56 bitrate=4110.6kbits/s dup=2 drop=0 speed=1.11x    
    
frame=  284 fps= 35 q=24.0 size=    4601kB time=00:00:09.23 bitrate=4083.5kbits/s dup=2 drop=0 speed=1.12x    
    
frame=  304 fps= 35 q=24.0 size=    4886kB time=00:00:09.89 bitrate=4044.4kbits/s dup=2 drop=0 speed=1.14x    
    
frame=  314 fps= 35 q=-1.0 Lsize=    5138kB time=00:00:10.46 bitrate=4022.4kbits/s dup=2 drop=0 speed=1.16x    
    
video:5135kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.040961%
    
[libx264 @ 0xee1fdc00] frame I:2     Avg QP:20.50  size: 84700
    
[libx264 @ 0xee1fdc00] frame P:312   Avg QP:24.06  size: 16310
    
[libx264 @ 0xee1fdc00] mb I  I16..4: 100.0%  0.0%  0.0%
    
[libx264 @ 0xee1fdc00] mb P  I16..4:  7.7%  0.0%  0.0%  P16..4: 54.9%  0.0%  0.0%  0.0%  0.0%    skip:37.4%
    
[libx264 @ 0xee1fdc00] coded y,uvDC,uvAC intra: 62.7% 22.9% 3.4% inter: 26.1% 8.4% 0.9%
    
[libx264 @ 0xee1fdc00] i16 v,h,dc,p: 13% 14% 59% 13%
    
[libx264 @ 0xee1fdc00] i8c dc,h,v,p: 47% 24% 22%  6%
    
[libx264 @ 0xee1fdc00] kb/s:4020.26
    
 Success
    
time used: 9843

    So what could be the reason of such low CPU load ?

  • How to convert fisheye-video into an equirectangular video to use with 360°-video viewers ?

    11 juin 2017, par P. Dee

    Actioncams like GoPro put a wider fov into a standard 1920 x 1080 or higher resolution at the expense of distortion.

    How do I use ffmpeg to convert this fov-encoded format into an equirectangular video to use with 360°-video viewers ?

  • Webm - Video playback stops after seeking

    27 février 2017, par Ryan Vancity Gosling

    I am attempting to stream a Webm video file encoded from FFmpeg.

    However when I seek to a position which hasn’t been buffered, video playback stops.

    I’ve verified that the correct byte range has been downloaded.

    Any idea whats causing this ? Seeking worked flawlessly for mp4 files encoded in x264. Webm seems to be the problem. Might be a problem with the way video was encoded.

    ffmpeg -i input.mp4 -codec:v libvpx -quality best -b:v 4000k -qmin 10
    -qmax 42 -maxrate 4024k -bufsize 8048k -vf scale=-1:1080 -codec:a libvorbis -b:a 384k -movflags faststart out.webm

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