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• VP8 Codec SDK "Aylesbury" Release

  28 octobre 2010, par noreply@blogger.com (John Luther)

  Today we’re making available "Aylesbury," our first named release of libvpx, the VP8 codec SDK. VP8 is the video codec used in WebM. Note that the VP8 specification has not changed, only the SDK.

  What’s an Aylesbury ? It’s a breed of duck. We like ducks, so we plan to use duck-related names for each major libvpx release, in alphabetical order. Our goal is to have one named release of libvpx per calendar quarter, each with a theme.

  You can download the Aylesbury libvpx release from our Downloads page or check it out of our Git repository and build it yourself. In the coming days Aylesbury will be integrated into all of the WebM project components (DirectShow filters, QuickTime plugins, etc.). We encourage anyone using our components to upgrade to the Aylesbury releases.

  For Aylesbury the theme was faster decoder, better encoder. We used our May 19, 2010 launch release of libvpx as the benchmark. We’re very happy with the results (see graphs below) :
  

  • 20-40% (average 28%) improvement in libvpx decoder speed
  • Over 7% overall PSNR improvement (6.3% SSIM) in VP8 "best" quality encoding mode, and up to 60% improvement on very noisy, still or slow moving source video.

  

  
  

  

  
  

  

  
  

  The main improvements to the decoder are :
  

  • Single-core assembly "hot spot" optimizations, including improved vp8_sixtap_predict() and SSE2 loopfilter functions
  • Threading improvements for more efficient use of multiple processor cores
  • Improved memory handling and reduced footprint
  • Combining IDCT and reconstruction steps
  • SSSE3 usage in functions where appropriate

  On the encoder front, we concentrated on clips in the 30-45 dB range and saw the biggest gains in higher-quality source clips (greater that 38 dB), low to medium-motion clips, and clips with noisy source material. Many code contributions made this possible, but a few of the highlights were :
  

  • Adaptive width and strength alternate reference frame noise suppression filter with optional motion compensation.
  • Transform improvements (improved accuracy and reduction in round trip error)
  • Trellis-based quantized coefficient optimization
  • Two-pass rate control and quantizer changes
  • Rate distortion changes
  • Zero bin and rounding changes
  • Work on MB-level quality control and bit allocation

  We’re targeting Q1 2011 for the next named libvpx release, which we’re calling Bali. The theme for that release will be faster encoder. We are constantly working on improvements to video quality in the encoder, so after Aylesbury we won’t tie that work to specific named releases.

  WebM at Streaming Media West

  Members of the WebM project will discuss Aylesbury during a session at the Streaming Media West conference on November 3rd (session C203 : WebM Open Video Project Update). For more information, visit www.streamingmedia.com/west.

  John Luther is Product Manager of the WebM Project.

  

• Video HLS with AVPlayer

  5 octobre 2016, par Charlie227

  I’ve converted .MOV video using this command line :

  ffmpeg -re -i 123.mov -vcodec copy -map 0 -f segment -segment_list 123.m3u8 \-segment_list_flags +live -segment_time 3 123%03d.ts

  output :

      ffmpeg version N-81872-gbe1d324 Copyright (c) 2000-2016 the FFmpeg developers
  
        built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)
  
        configuration: --prefix=/usr/local --enable-gpl --enable-nonfree
  
        libavutil      55. 32.100 / 55. 32.100
  
        libavcodec     57. 60.101 / 57. 60.101
  
        libavformat    57. 51.102 / 57. 51.102
  
        libavdevice    57.  0.102 / 57.  0.102
  
        libavfilter     6. 63.100 /  6. 63.100
  
        libswscale      4.  1.100 /  4.  1.100
  
        libswresample   2.  2.100 /  2.  2.100
  
        libpostproc    54.  0.100 / 54.  0.100
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '123.mov':
  
        Metadata:
  
          major_brand     : qt  
  
          minor_version   : 0
  
          compatible_brands: qt  
  
          creation_time   : 2016-09-26T19:34:01.000000Z
  
        Duration: 00:00:20.00, start: 0.000000, bitrate: 1210 kb/s
  
          Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 540x960, 1088 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default)
  
          Metadata:
  
            creation_time   : 2016-09-26T19:34:01.000000Z
  
            handler_name    : Core Media Data Handler
  
            encoder         : H.264
  
          Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 114 kb/s (default)
  
          Metadata:
  
            creation_time   : 2016-09-26T19:34:01.000000Z
  
            handler_name    : Core Media Data Handler
  
      Output #0, segment, to '123%03d.ts':
  
        Metadata:
  
          major_brand     : qt  
  
          minor_version   : 0
  
          compatible_brands: qt  
  
          encoder         : Lavf57.51.102
  
          Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 540x960, q=2-31, 1088 kb/s, 30 fps, 30 tbr, 90k tbn, 600 tbc (default)
  
          Metadata:
  
            creation_time   : 2016-09-26T19:34:01.000000Z
  
            handler_name    : Core Media Data Handler
  
            encoder         : H.264
  
          Stream #0:1(und): Audio: mp2, 44100 Hz, stereo, s16, 384 kb/s (default)
  
          Metadata:
  
            creation_time   : 2016-09-26T19:34:01.000000Z
  
            handler_name    : Core Media Data Handler
  
            encoder         : Lavc57.60.101 mp2
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (copy)
  
        Stream #0:1 -> #0:1 (aac (native) -> mp2 (native))
  
      Press [q] to stop, [?] for help
  
      frame=    1 fps=1.0 q=-1.0 size=N/A time=00:00:01.00 bitrate=N/A speed=0.996x   
  
   frame=   32 fps= 16 q=-1.0 size=N/A time=00:00:02.00 bitrate=N/A speed=0.987x   
  
   frame=   47 fps= 19 q=-1.0 size=N/A time=00:00:02.52 bitrate=N/A speed=0.996x   
  
   frame=   63 fps= 21 q=-1.0 size=N/A time=00:00:03.01 bitrate=N/A speed=0.993x   
  
    frame=   77 fps= 22 q=-1.0 size=N/A time=00:00:03.54 bitrate=N/A speed=0.998x   
  
   frame=   93 fps= 23 q=-1.0 size=N/A time=00:00:04.03 bitrate=N/A speed=0.995x   
  
    frame=  108 fps= 24 q=-1.0 size=N/A time=00:00:04.56 bitrate=N/A speed=0.999x   
  
   frame=  123 fps= 24 q=-1.0 size=N/A time=00:00:05.05 bitrate=N/A speed=0.997x   
  
    frame=  139 fps= 25 q=-1.0 size=N/A time=00:00:05.55 bitrate=N/A speed=0.996x   
  
   frame=  154 fps= 25 q=-1.0 size=N/A time=00:00:06.04 bitrate=N/A speed=0.994x   
  
    frame=  169 fps= 26 q=-1.0 size=N/A time=00:00:06.57 bitrate=N/A speed=0.997x   
  
    frame=  184 fps= 26 q=-1.0 size=N/A time=00:00:07.09 bitrate=N/A speed=0.999x   
  
    frame=  199 fps= 26 q=-1.0 size=N/A time=00:00:07.59 bitrate=N/A speed=0.998x   
  
    frame=  230 fps= 27 q=-1.0 size=N/A time=00:00:08.58 bitrate=N/A speed=0.995x   
  
    frame=  261 fps= 27 q=-1.0 size=N/A time=00:00:09.60 bitrate=N/A speed=0.996x   
  
    frame=  275 fps= 27 q=-1.0 size=N/A time=00:00:10.12 bitrate=N/A speed=0.998x   
  
    frame=  306 fps= 27 q=-1.0 size=N/A time=00:00:11.14 bitrate=N/A speed=0.999x   
  
    frame=  337 fps= 28 q=-1.0 size=N/A time=00:00:12.13 bitrate=N/A speed=0.997x   
  
    frame=  352 fps= 28 q=-1.0 size=N/A time=00:00:12.65 bitrate=N/A speed=0.998x   
  
    frame=  367 fps= 28 q=-1.0 size=N/A time=00:00:13.15 bitrate=N/A speed=0.997x   
  
    frame=  382 fps= 28 q=-1.0 size=N/A time=00:00:13.67 bitrate=N/A speed=0.999x   
  
    frame=  412 fps= 28 q=-1.0 size=N/A time=00:00:14.69 bitrate=N/A speed=0.999x   
  
    frame=  428 fps= 28 q=-1.0 size=N/A time=00:00:15.19 bitrate=N/A speed=0.998x   
  
    frame=  443 fps= 28 q=-1.0 size=N/A time=00:00:15.68 bitrate=N/A speed=0.998x   
  
    frame=  473 fps= 28 q=-1.0 size=N/A time=00:00:16.70 bitrate=N/A speed=0.998x   
  
    frame=  488 fps= 28 q=-1.0 size=N/A time=00:00:17.22 bitrate=N/A speed=0.999x   
  
    frame=  519 fps= 28 q=-1.0 size=N/A time=00:00:18.24 bitrate=N/A speed=0.999x   
  
    frame=  550 fps= 29 q=-1.0 size=N/A time=00:00:19.24 bitrate=N/A speed=0.998x   
  
    frame=  565 fps= 29 q=-1.0 size=N/A time=00:00:19.76 bitrate=N/A speed=0.999x   
  
    frame=  601 fps= 30 q=-1.0 Lsize=N/A time=00:00:20.02 bitrate=N/A speed=   1x    
  
      video:2663kB audio:939kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  The final video is available here, i’m able to read it from Safari on Mac OS, but it doesn’t work on iOS using AVPlayer or Safari.

  I also tried to play it using this sample code provided by Apple, however i get the following error :
  "The decoder required for this media cannot be found"

  Any help is appreciated

  ---

  edit 1

  I’ve edit the command line, and now i’m able to play the video using AVPlayer, but there is no sound...

  ffmpeg -i 123.mov -c:a libfdk_aac -profile:a aac_he -b:a 64k -c:v h264 -preset slow -map 0 -an -flags -global_header -f hls -hls_time 2 123%03d.ts

  OUTPUT :

      ffmpeg version N-81883-gbeb877b Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)
  
    configuration: --enable-gpl --enable-nonfree --enable-shared --enable-libfdk-aac --enable-libx264 --extra-cflags=-I/usr/local/include --extra-ldflags=-L/usr/local/lib
  
    libavutil      55. 32.100 / 55. 32.100
  
    libavcodec     57. 60.101 / 57. 60.101
  
    libavformat    57. 51.102 / 57. 51.102
  
    libavdevice    57.  0.102 / 57.  0.102
  
    libavfilter     6. 63.100 /  6. 63.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  2.100 /  2.  2.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '123.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2016-09-26T19:34:01.000000Z
  
    Duration: 00:00:20.00, start: 0.000000, bitrate: 1210 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 540x960, 1088 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-09-26T19:34:01.000000Z
  
        handler_name    : Core Media Data Handler
  
        encoder         : H.264
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 114 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-09-26T19:34:01.000000Z
  
        handler_name    : Core Media Data Handler
  
  Codec AVOption b (set bitrate (in bits/s)) specified for output file #0 (123%03d.ts) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
  
  Codec AVOption profile () specified for output file #0 (123%03d.ts) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
  
  [libx264 @ 0x14ca8a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x14ca8a0] profile High, level 3.1
  
  Output #0, hls, to '123%03d.ts':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      encoder         : Lavf57.51.102
  
      Stream #0:0(und): Video: h264 (libx264), yuv420p, 540x960, q=-1--1, 30 fps, 90k tbn, 30 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-09-26T19:34:01.000000Z
  
        handler_name    : Core Media Data Handler
  
        encoder         : Lavc57.60.101 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=  600 fps= 79 q=-1.0 Lsize=N/A time=00:00:19.90 bitrate=N/A dup=1 drop=0 speed=2.63x    
  
  video:3542kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  [libx264 @ 0x14ca8a0] frame I:18    Avg QP:21.70  size: 13958
  
  [libx264 @ 0x14ca8a0] frame P:326   Avg QP:23.78  size:  7702
  
  [libx264 @ 0x14ca8a0] frame B:256   Avg QP:24.83  size:  3380
  
  [libx264 @ 0x14ca8a0] consecutive B-frames: 26.8% 46.0%  8.5% 18.7%
  
  [libx264 @ 0x14ca8a0] mb I  I16..4: 21.5% 71.7%  6.9%
  
  [libx264 @ 0x14ca8a0] mb P  I16..4: 14.9% 29.6%  1.5%  P16..4: 32.2%  5.4%  2.2%  0.0%  0.0%    skip:14.1%
  
  [libx264 @ 0x14ca8a0] mb B  I16..4:  3.0%  4.4%  0.3%  B16..8: 37.9%  4.5%  0.4%  direct: 5.0%  skip:44.6%  L0:50.0% L1:47.1% BI: 2.9%
  
  [libx264 @ 0x14ca8a0] 8x8 transform intra:64.3% inter:82.5%
  
  [libx264 @ 0x14ca8a0] direct mvs  spatial:97.7% temporal:2.3%
  
  [libx264 @ 0x14ca8a0] coded y,uvDC,uvAC intra: 30.0% 44.4% 4.9% inter: 10.1% 20.7% 0.4%
  
  [libx264 @ 0x14ca8a0] i16 v,h,dc,p: 29% 33% 13% 26%
  
  [libx264 @ 0x14ca8a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 24% 18%  4%  5%  6%  8%  5%  6%
  
  [libx264 @ 0x14ca8a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 35% 11%  4%  6%  5%  9%  4%  6%
  
  [libx264 @ 0x14ca8a0] i8c dc,h,v,p: 36% 29% 23% 12%
  
  [libx264 @ 0x14ca8a0] Weighted P-Frames: Y:0.9% UV:0.3%
  
  [libx264 @ 0x14ca8a0] ref P L0: 80.5%  9.7%  6.1%  2.0%  1.3%  0.2%
  
  [libx264 @ 0x14ca8a0] ref B L0: 92.2%  5.5%  2.0%  0.3%
  
  [libx264 @ 0x14ca8a0] ref B L1: 99.0%  1.0%
  
  [libx264 @ 0x14ca8a0] kb/s:1450.98

• FFMPEG - Is it possible to cut from one video multiple segments and stitch them together ?

  27 mars 2014, par ajacian81

  I'm trying to do this in as few steps as possible since I'm doing this in Android and FFMPEG SegFaults if run multiple times (in the same process).

  Assume I have a 25 minute video :
  I want to cut from minute 1 to minute 5.
  I also want to cut from minute 8 to minute 13.
  I also want to cut from minute 17 to 23.
  I then want to stitch them together into a new video file.

  I can do the above steps as their own individual steps (using -ss and -t as well as the concat filter), however, I'm wondering if it's possible to do this in FFMPEG in a single execution ?