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• How to capture video of VIEW in android

  18 novembre 2015, par Mayur R. Amipara

  we can take screen-shot of particular VIEW programmatically in android same way i want to capture video of VIEW , is that possible ?

  i successfully run third party library ffmpeg but it doesn’t provide such functionality.

  Another way i tried it by taking so many screenshot of view each-second and combine it with ffmpeg , but it is to expensive and taking soooooo much time.

  FINAL QUESTIONS :

  i want to add text that is animating on video, any idea todo this ?

  currently get idea that i can animating textview in layout above video is playing in activity and capture that part of screen programatically, but i fail !

  iphone have functionality for adding text overlay with animation and it is called by AVComposition in iPhone. so, Android have such type of any functions or method ?... googled it for 5 days but not getting any result !

  sorry for my bad english, any point to suggest or any idea that how can i achieve this ?

• How can I fix choppy ffmpeg RTP streaming over wifi ?

  19 décembre 2015, par awidgery

  I have a Raspberry Pi, with a USB mic and a WiFi dongle dongle connected.

  I’m trying to stream audio only from the Pi, with the intention of receiving the stream over wifi to a custom iOS mobile app using VLCKit. I’m using ffmpeg on the Pi as I need a reasonably low (<2s) latency for this project, and using Icecast/Darkice gave around 15s latency.

  The code executed on the Pi is :

  ffmpeg -f alsa -i plughw:1,0 -acodec libmp3lame -ab 128k -ac 1 -ar 44100  -f rtp rtp://234.5.5.5:1234

  On the Pi end I have a device playing (Christmas !) music constantly into the USB mic for testing purposes. The Pi is only connected by WiFi - not ethernet.

  For testing receiving the stream, I’m using VLC (on a Macbook/iPhone).

  When the Mac is connected through Ethernet, the stream works fine, as you can see here :

  https://goo.gl/photos/HZgNh7z4HgaqHBaP7

  However, when the Mac is connected via WiFi, the stream is choppy, as you can see here :

  https://goo.gl/photos/qjAVH6djqS9Jbvmh6

  You can also see a ping trace from the Mac to the Pi, and the VLC stats. As you can see there doesn’t seem to be a correlation between either of these and the choppiness.

  I’ve tried the VLC iOS app and the choppiness is the same as the Mac on WiFi.

  How can I decrease/remove this chop, even if doing so increases latency a bit ?

• ffmpeg converted x264 video shows sharply reduced color saturation

  3 novembre 2015, par xaphod

  I’m an ffmpeg noob. I did spend 30 mins googling stackoverflow though, and didn’t find an answer.

  My designer made me some videos, of animated drawings. They’re great, but huge. So I tried passing them through ffmpeg. They get 10x smaller and don’t look pixelated — great ! — but the color is greatly reduced. What’s bright red/pink in the original becomes washed out ashey-grey-red in the output, when I view it on my macbook, or in the app it’s going into (iOS — ie. on an iPhone 5S you can see the missing color). How can I get the color to stay the same(ish) ?

  ffmpeg -i original.mp4

  shows me this :

  ffmpeg version 2.8 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with Apple LLVM version 7.0.0 (clang-700.0.72)
  
    configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-vda --enable-videotoolbox --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '01 Introanimation@25fps_2.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2015-10-28 22:08:44
  
    Duration: 00:00:16.00, start: 0.000000, bitrate: 1613 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 720x720, 1434 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2015-10-28 22:08:44
  
        handler_name    : Alias Data Handler
  
        encoder         : AVC Coding

  ... so far I tried ...

  ffmpeg -i original.mp4 -vf format=yuvj420p -color_range 2 -vcodec libx264 out.mp4

  ... and many others, but no luck.

  Original.mp4 is here : http://fuzzymunchkin.com/tmp/original.mp4

  EDIT : posting the output of a (no-parameters) conversion, as requested.

  ffmpeg -i original.mp4 out.mp4
  
  ffmpeg version 2.8 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with Apple LLVM version 7.0.0 (clang-700.0.72)
  
    configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-vda --enable-videotoolbox --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'original.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2015-10-28 22:08:44
  
    Duration: 00:00:16.00, start: 0.000000, bitrate: 1613 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 720x720, 1434 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2015-10-28 22:08:44
  
        handler_name    : Alias Data Handler
  
        encoder         : AVC Coding
  
  [libx264 @ 0x7f8a5b80ea00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
  
  [libx264 @ 0x7f8a5b80ea00] profile High, level 3.1
  
  [libx264 @ 0x7f8a5b80ea00] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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 'out.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      encoder         : Lavf56.40.101
  
      Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x720, q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 2015-10-28 22:08:44
  
        handler_name    : Alias Data Handler
  
        encoder         : Lavc56.60.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=  400 fps=0.0 q=-1.0 Lsize=     262kB time=00:00:15.92 bitrate= 134.9kbits/s    
  
  video:257kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.971545%
  
  [libx264 @ 0x7f8a5b80ea00] frame I:2     Avg QP:13.86  size:  9730
  
  [libx264 @ 0x7f8a5b80ea00] frame P:174   Avg QP:21.01  size:  1121
  
  [libx264 @ 0x7f8a5b80ea00] frame B:224   Avg QP:20.88  size:   215
  
  [libx264 @ 0x7f8a5b80ea00] consecutive B-frames: 19.2% 17.0%  3.8% 60.0%
  
  [libx264 @ 0x7f8a5b80ea00] mb I  I16..4: 62.9% 26.0% 11.1%
  
  [libx264 @ 0x7f8a5b80ea00] mb P  I16..4:  3.7%  1.0%  0.7%  P16..4:  3.0%  1.5%  0.8%  0.0%  0.0%    skip:89.3%
  
  [libx264 @ 0x7f8a5b80ea00] mb B  I16..4:  0.4%  0.1%  0.0%  B16..8:  3.3%  0.5%  0.0%  direct: 0.0%  skip:95.6%  L0:47.0% L1:43.5% BI: 9.5%
  
  [libx264 @ 0x7f8a5b80ea00] 8x8 transform intra:19.3% inter:33.8%
  
  [libx264 @ 0x7f8a5b80ea00] coded y,uvDC,uvAC intra: 7.4% 6.8% 5.5% inter: 0.5% 0.6% 0.5%
  
  [libx264 @ 0x7f8a5b80ea00] i16 v,h,dc,p: 70% 29%  1%  0%
  
  [libx264 @ 0x7f8a5b80ea00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15%  7% 77%  1%  0%  0%  0%  0%  0%
  
  [libx264 @ 0x7f8a5b80ea00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 23% 29%  3%  2%  2%  2%  1%  1%
  
  [libx264 @ 0x7f8a5b80ea00] i8c dc,h,v,p: 74% 10% 15%  0%
  
  [libx264 @ 0x7f8a5b80ea00] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7f8a5b80ea00] ref P L0: 64.1%  5.3% 17.6% 12.9%
  
  [libx264 @ 0x7f8a5b80ea00] ref B L0: 77.4% 19.7%  2.9%
  
  [libx264 @ 0x7f8a5b80ea00] ref B L1: 95.5%  4.5%
  
  [libx264 @ 0x7f8a5b80ea00] kb/s:131.31