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• Encode video for streaming in Android using FFmpeg

  16 décembre 2013, par Timofey

  UPD : I guess I found the problem. For some reason, 1800x1080 video aren't playing while same vid resized to 800x480 with same set of encoding settings is working just fine.
  So the question is : why I couldn't play video with res. bigger than the size of my screen ?

  I'm trying to build a simple video-streaming app for android.

  For the purpose of testing, I used this video http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4, and it worked fine.

  However I miserably failed trying to prepare my own video for streaming.
  I'm using FFmpeg & libx264 with the following line (last attempt) :

  ffmpeg -i <input /> -c:v libx264 -profile:v baseline -c:a aac -strict experimental <output>
  
  </output>

  Then I passed the output to qt-faststart, as some people suggested... No effect.

  Here is the output of ffmpeg -i for my video :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bbb_audio_h264.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 2008-05-27 18:40:35
  
      encoder         : Lavf53.32.100
  
    Duration: 00:00:10.04, start: 0.000000, bitrate: 5048 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080, 4605 kb/s, 24 fps, 24 tbr, 24 tbn, 48 tbc
  
      Metadata:
  
        creation_time   : 2008-05-27 18:40:35
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 5.1, s16, 440 kb/s
  
      Metadata:
  
        creation_time   : 2008-05-27 18:40:35
  
        handler_name    : 

  And for the working one :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'big_buck_bunny.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp42avc1
  
      creation_time   : 2010-02-09 01:55:39
  
    Duration: 00:01:00.09, start: 0.000000, bitrate: 733 kb/s
  
      Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 22050 Hz, stereo, s16, 65 kb/s
  
      Metadata:
  
        creation_time   : 2010-02-09 01:55:39
  
        handler_name    : Apple Sound Media Handler
  
      Stream #0:1(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x360, 612 kb/s, 23.96 fps, 24 tbr, 600 tbn, 1200 tbc
  
      Metadata:
  
        creation_time   : 2010-02-09 01:55:39
  
        handler_name    : Apple Video Media Handler
  
      Stream #0:2(eng): Data: none (rtp  / 0x20707472)
  
      Metadata:
  
        creation_time   : 2010-02-09 01:55:39
  
        handler_name    : hint media handler
  
      Stream #0:3(eng): Data: none (rtp  / 0x20707472)
  
      Metadata:
  
        creation_time   : 2010-02-09 01:55:39
  
        handler_name    : hint media handler

• Change the Sample/Pixel aspect ratio of video with least possible video re-encoding

  27 août 2022, par PiTao

  I need to have some mp4 videos with square sample (pixel) aspect ratio (1:1) i.e. square pixels. However, as ffprobe shows my video has PAR of 59:54.

  


  I have tried using this command :

  


  ffmpeg  -i in.mp4 -c copy -bsf:v "h264_metadata=sample_aspect_ratio=1/1" out.mp4


  


  but still the PAR has not changed in my downstream applicaiton or as I checked it with the ffprobe :

  


  ffprobe version n5.1 Copyright (c) 2007-2022 the FFmpeg developers
  built with gcc 12.1.1 (GCC) 20220730
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-shared --enable-version3
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vimeo_11261121.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.27.100
  Duration: 00:00:52.36, start: 0.000000, bitrate: 519 kb/s
  Stream #0:0[0x1](eng): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p(progressive), 720x576 [SAR 1:1 DAR 5:4], 382 kb/s, SAR 59:54 DAR 295:216, 25 fps, 25 tbr, 12800 tbn (default)
    Metadata:
      handler_name    : Apple Video Media Handler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 130 kb/s (default)
    Metadata:
      handler_name    : Apple Sound Media Handler
      vendor_id       : [0][0][0][0]


  


  If I not mistaken, the ffmpeg only changes the metadata and not the actual PAR. Is it possible to change the PAR (sample aspect ratio) preferably without much re-encoding ?

  


• Why does my webm not work in Unity but others do ?

  5 avril 2019, par UserDude

  Ok Im just trying to play a transparent video in Unity and Im following http://mikebrinkerink.com/2018/04/05/preparing-a-video-with-alpha-channel-for-unity/ and other tutorials.

  Ive tried exporting as ProRes 444 with alpha and as Webm VP8, and using terminal ffmpeg commands. Yet when I drop the video into Unity it loads indefinitely and I have to force quit.

  My file is this : https://drive.google.com/file/d/1RhOvYfeaK1rEaKdlTNcJB9EBpz4xxjvw/view?usp=sharing

  And this one that I downloaded works fine : https://simpl.info/videoalpha/video/dancer1.webm

  Whats the difference/how can I get mine to work ?

  Log :

  ffmpeg -i my_clip_with_alpha.avi -vcodec vp8 -acodec libvorbis -pix_fmt yuva420p -metadata:s:v:0 alpha_mode=”1″ -auto-alt-ref 0 my_vp8_clip_with_alpha.webm​

  as the command (with my clip’s name)

  Then

  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  
    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
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/skylarthomas/Desktop/INSTRUCTIONS1_00000.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2019-03-27T00:19:30.000000Z
  
    Duration: 00:00:17.05, start: 0.000000, bitrate: 40959 kb/s
  
      Stream #0:0(eng): Video: prores (ap4h / 0x68347061), yuva444p10le(tv, bt709, progressive), 2215x1773, 40467 kb/s, SAR 1:1 DAR 2215:1773, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default)
  
      Metadata:
  
        creation_time   : 2019-03-27T00:19:30.000000Z
  
        handler_name    : Apple Video Media Handler
  
        encoder         : Apple ProRes 4444
  
        timecode        : 00:00:00:00
  
      Stream #0:1(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-03-27T00:19:30.000000Z
  
        handler_name    : Time Code Media Handler
  
        timecode        : 00:00:00:00
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (prores (native) -> vp8 (libvpx))
  
  Press [q] to stop, [?] for help
  
  [libvpx @ 0x7fe11701d600] v1.8.0
  
  Output #0, webm, to 'my_vp8_clip_with_alpha.webm':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      encoder         : Lavf58.20.100
  
      Stream #0:0(eng): Video: vp8 (libvpx), yuva420p, 2215x1773 [SAR 1:1 DAR 2215:1773], q=-1--1, 200 kb/s, 29.97 fps, 1k tbn, 29.97 tbc (default)
  
      Metadata:
  
        creation_time   : 2019-03-27T00:19:30.000000Z
  
        handler_name    : Apple Video Media Handler
  
        timecode        : 00:00:00:00
  
        alpha_mode      : ”1″
  
        encoder         : Lavc58.35.100 libvpx
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  frame=    2 fps=2.0 q=0.0 size=       1kB time=00:00:00.03 bitrate= 200.7kbits/sframe=    6 fps=3.7 q=0.0 size=       1kB time=00:00:00.16 bitrate=  40.6kbits/sframe=   10 fps=4.5 q=0.0 size=       1kB time=00:00:00.30 bitrate=  22.7kbits/s speedframe=   35 fps=2.9 q=0.0 size=       1kB time=00:00:01.13 bitrate=   6.0kbits/s speed=0.0934x