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• Building ffmpeg on Windows

  27 février 2014, par Niranjan

  I've the source code of ffmpeg and would like to build it in my win7. I've minGW installed on my machine. I found a step by step instruction from this link :

  http://www.gooli.org/blog/building-ffmpeg-for-windows-with-msys-and-mingw/

  The link 'Download updated bash for MSYS' did not follow. It showed the file is not found. When I try to build the program the way explained in the site, it shows an error :

  Unknown option “–extra-cflags=-mno-cygwin”.
  See ./configure –help for available options.
  ./myconfig : –extra-ldflags=-Wl,–add-stdcall-alias : command not found
  ./myconfig : –target-os=mingw32 : command not found

  From a similar question posted here, I followed the link http://ffmpeg.arrozcru.org/ but the static build downloaded from the site was corrupted. Pls help.

• The use cases for a element in HTML

  27 novembre 2012, par silvia

  The W3C HTML WG and the WHATWG are currently discussing the introduction of a <main> element into HTML.

  The <main> element has been proposed by Steve Faulkner and is specified in a draft extension spec which is about to be accepted as a FPWD (first public working draft) by the W3C HTML WG. This implies that the W3C HTML WG will be looking for implementations and for feedback by implementers on this spec.

  I am supportive of the introduction of a <main> element into HTML. However, I believe that the current spec and use case list don’t make a good enough case for its introduction. Here are my thoughts.

  Main use case : accessibility

  In my opinion, the main use case for the introduction of <main> is accessibility.

  Like any other users, when blind users want to perceive a Web page/application, they need to have a quick means of grasping the content of a page. Since they cannot visually scan the layout and thus determine where the main content is, they use accessibility technology (AT) to find what is known as “landmarks”.

  “Landmarks” tell the user what semantic content is on a page : a header (such as a banner), a search box, a navigation menu, some asides (also called complementary content), a footer, …. and the most important part : the main content of the page. It is this main content that a blind user most often wants to skip to directly.

  In the days of HTML4, a hidden “skip to content” link at the beginning of the Web page was used as a means to help blind users access the main content.

  In the days of ARIA, the aria @role=main enables authors to avoid a hidden link and instead mark the element where the main content begins to allow direct access to the main content. This attribute is supported by AT – in particular screen readers – by making it part of the landmarks that AT can directly skip to.

  Both the hidden link and the ARIA @role=main approaches are, however, band aids : they are being used by those of us that make “finished” Web pages accessible by adding specific extra markup.

  A world where ARIA is not necessary and where accessibility developers would be out of a job because the normal markup that everyone writes already creates accessible Web sites/applications would be much preferable over the current world of band-aids.

  Therefore, to me, the primary use case for a <main> element is to achieve exactly this better world and not require specialized markup to tell a user (or a tool) where the main content on a page starts.

  An immediate effect would be that pages that have a <main> element will expose a “main” landmark to blind and vision-impaired users that will enable them to directly access that main content on the page without having to wade through other text on the page. Without a <main> element, this functionality can currently only be provided using heuristics to skip other semantic and structural elements and is for this reason not typically implemented in AT.

  Other use cases

  The <main> element is a semantic element not unlike other new semantic elements such as <header>, <footer>, <aside>, <article>, <nav>, or <section>. Thus, it can also serve other uses where the main content on a Web page/Web application needs to be identified.

  Data mining

  For data mining of Web content, the identification of the main content is one of the key challenges. Many scholarly articles have been published on this topic. This stackoverflow article references and suggests a multitude of approaches, but the accepted answer says “there’s no way to do this that’s guaranteed to work”. This is because Web pages are inherently complex and many <div>, <p>, <iframe> and other elements are used to provide markup for styling, notifications, ads, analytics and other use cases that are necessary to make a Web page complete, but don’t contribute to what a user consumes as semantically rich content. A <main> element will allow authors to pro-actively direct data mining tools to the main content.

  Search engines

  One particularly important “data mining” tool are search engines. They, too, have a hard time to identify which sections of a Web page are more important than others and employ many heuristics to do so, see e.g. this ACM article. Yet, they still disappoint with poor results pointing to findings of keywords in little relevant sections of a page rather than ranking Web pages higher where the keywords turn up in the main content area. A <main> element would be able to help search engines give text in main content areas a higher weight and prefer them over other areas of the Web page. It would be able to rank different Web pages depending on where on the page the search words are found. The <main> element will be an additional hint that search engines will digest.

  Visual focus

  On small devices, the display of Web pages designed for Desktop often causes confusion as to where the main content can be found and read, in particular when the text ends up being too small to be readable. It would be nice if browsers on small devices had a functionality (maybe a default setting) where Web pages would start being displayed as zoomed in on the main content. This could alleviate some of the headaches of responsive Web design, where the recommendation is to show high priority content as the first content. Right now this problem is addressed through stylesheets that re-layout the page differently depending on device, but again this is a band-aid solution. Explicit semantic markup of the main content can solve this problem more elegantly.

  Styling

  Finally, naturally, <main> would also be used to style the main content differently from others. You can e.g. replace a semantically meaningless <div id=”main”> with a semantically meaningful <main> where their position is identical. My analysis below shows, that this is not always the case, since oftentimes <div id=”main”> is used to group everything together that is not the header – in particular where there are multiple columns. Thus, the ease of styling a <main> element is only a positive side effect and not actually a real use case. It does make it easier, however, to adapt the style of the main content e.g. with media queries.

  Proposed alternative solutions

  It has been proposed that existing markup serves to satisfy the use cases that <main> has been proposed for. Let’s analyse these on some of the most popular Web sites. First let’s list the propsed algorithms.

  Proposed solution No 1 : Scooby-Doo

  On Sat, Nov 17, 2012 at 11:01 AM, Ian Hickson <ian@hixie.ch> wrote :
  | The main content is whatever content isn’t
  | marked up as not being main content (anything not marked up with <header>,
  | <aside>, <nav>, etc).
  

  This implies that the first element that is not a <header>, <aside>, <nav>, or <footer> will be the element that we want to give to a blind user as the location where they should start reading. The algorithm is implemented in https://gist.github.com/4032962.

  Proposed solution No 2 : First article element

  On Sat, Nov 17, 2012 at 8:01 AM, Ian Hickson <ian@hixie.ch> wrote :
  | On Thu, 15 Nov 2012, Ian Yang wrote :
  | >
  | > That’s a good idea. We really need an element to wrap all the <p>s,
  | > <ul>s, <ol>s, <figure>s, <table>s ... etc of a blog post.
  |
  | That’s called <article>.
  

  This approach identifies the first <article> element on the page as containing the main content. Here’s the algorithm for this approach.

  Proposed solution No 3 : An example heuristic approach

  The readability plugin has been developed to make Web pages readable by essentially removing all the non-main content from a page. An early source of readability is available. This demonstrates what a heuristic approach can perform.

  Analysing alternative solutions

  Comparison

  I’ve picked 4 typical Websites (top on Alexa) to analyse how these three different approaches fare. Ideally, I’d like to simply apply the above three scripts and compare pictures. However, since the semantic HTML5 elements <header>, <aside>, <nav>, and <footer> are not actually used by any of these Web sites, I don’t actually have this choice.

  So, instead, I decided to make some assumptions of where these semantic elements would be used and what the outcome of applying the first two algorithms would be. I can then compare it to the third, which is a product so we can take screenshots.

  Google.com

  http://google.com – search for “Scooby Doo”.

  The search results page would likely be built with :

  • a <nav> menu for the Google bar
  • a <header> for the search bar
  • another <header> for the login section
  • another <nav> menu for the search types
  • a <div> to contain the rest of the page
  • a <div> for the app bar with the search number
  • a few <aside>s for the left and right column
  • a set of <article>s for the search results

  “Scooby Doo” would find the first element after the headers as the “main content”. This is the element before the app bar in this case. Interestingly, there is a <div @id=main> already in the current Google results page, which “Scooby Doo” would likely also pick. However, there are a nav bar and two asides in this div, which clearly should not be part of the “main content”. Google actually placed a @role=main on a different element, namely the one that encapsulates all the search results.

  “First Article” would find the first search result as the “main content”. While not quite the same as what Google intended – namely all search results – it is close enough to be useful.

  The “readability” result is interesting, since it is not able to identify the main text on the page. It is actually aware of this problem and brings a warning before displaying this page :

  

  Facebook.com

  https://facebook.com

  A user page would likely be built with :

  • a <header> bar for the search and login bar
  • a <div> to contain the rest of the page
  • an <aside> for the left column
  • a <div> to contain the center and right column
  • an <aside> for the right column
  • a <header> to contain the center column “megaphone”
  • a <div> for the status posting
  • a set of <article>s for the home stream

  “Scooby Doo” would find the first element after the headers as the “main content”. This is the element that contains all three columns. It’s actually a <div @id=content> already in the current Facebook user page, which “Scooby Doo” would likely also pick. However, Facebook selected a different element to place the @role=main : the center column.

  “First Article” would find the first news item in the home stream. This is clearly not what Facebook intended, since they placed the @role=main on the center column, above the first blog post’s title. “First Article” would miss that title and the status posting.

  The “readability” result again disappoints but warns that it failed :

  

  YouTube.com

  http://youtube.com

  A video page would likely be built with :

  • a <header> bar for the search and login bar
  • a <nav> for the menu
  • a <div> to contain the rest of the page
  • a <header> for the video title and channel links
  • a <div> to contain the video with controls
  • a <div> to contain the center and right column
  • an <aside> for the right column with an <article> per related video
  • an <aside> for the information below the video
  • a <article> per comment below the video

  “Scooby Doo” would find the first element after the headers as the “main content”. This is the element that contains the rest of the page. It’s actually a <div @id=content> already in the current YouTube video page, which “Scooby Doo” would likely also pick. However, YouTube’s related videos and comments are unlikely to be what the user would regard as “main content” – it’s the video they are after, which generously has a <div id=watch-player>.

  “First Article” would find the first related video or comment in the home stream. This is clearly not what YouTube intends.

  The “readability” result is not quite as unusable, but still very bare :

  

  Wikipedia.com

  http://wikipedia.com (“Overscan” page)

  A Wikipedia page would likely be built with :

  • a <header> bar for the search, login and menu items
  • a <div> to contain the rest of the page
  • an &ls; article> with title and lots of text
  • <article> an <aside> with the table of contents
  • several <aside>s for the left column

  Good news : “Scooby Doo” would find the first element after the headers as the “main content”. This is the element that contains the rest of the page. It’s actually a <div id=”content” role=”main”> element on Wikipedia, which “Scooby Doo” would likely also pick.

  “First Article” would find the title and text of the main element on the page, but it would also include an <aside>.

  The “readability” result is also in agreement.

  

  Results

  In the following table we have summarised the results for the experiments :

  Site	Scooby-Doo	First article	Readability
  Google.com	FAIL	SUCCESS	FAIL
  Facebook.com	FAIL	FAIL	FAIL
  YouTube.com	FAIL	FAIL	FAIL
  Wikipedia.com	SUCCESS	SUCCESS	SUCCESS

  Clearly, Wikipedia is the prime example of a site where even the simple approaches find it easy to determine the main content on the page. WordPress blogs are similarly successful. Almost any other site, including news sites, social networks and search engine sites are petty hopeless with the proposed approaches, because there are too many elements that are used for layout or other purposes (notifications, hidden areas) such that the pre-determined list of semantic elements that are available simply don’t suffice to mark up a Web page/application completely.

  Conclusion

  It seems that in general it is impossible to determine which element(s) on a Web page should be the “main” piece of content that accessibility tools jump to when requested, that a search engine should put their focus on, or that should be highlighted to a general user to read. It would be very useful if the author of the Web page would provide a hint through a <main> element where that main content is to be found.

  I think that the <main> element becomes particularly useful when combined with a default keyboard shortcut in browsers as proposed by Steve : we may actually find that non-accessibility users will also start making use of this shortcut, e.g. to get to videos on YouTube pages directly without having to tab over search boxes and other interactive elements, etc. Worthwhile markup indeed.

• ffmpeg mp4 to mpeg and back again

  5 décembre 2012, par brux

  I am concatenating mp4 files, from research I have found out you must first encode to mpeg and contatenate those, then convert the larger mpeg file back to mp4.

  For simplicity I am just attempting to convert a.mp4 to mpeg and then back to mp4 (i dont need to worry about the concatenation for now)

  Here is how I first convert to my intermediary mpeg from mp4 :

      ffmpeg -i a.mp4 -q:v 2 -vcodec mpeg2video -acodec copy b.mpg

  The file is encoded with no errors, to convert back to mp4 I do :

      ffmpeg -i b.mpg -vcodec libx264 -acodec copy out.mp4

  Everything seems to work with no errors but out.mp4 just plays the first few frames and then freezes, and the time is skipping randomly as the duration passes for the file. No sound is heard also.

      *****************************************                              
  
      Here is the output of the first command
  
      *****************************************
  
  
  
  $ ffmpeg -i a.mp4 -q:v 2 -vcodec mpeg2video -acodec copy b.mpg
  
      ffmpeg version 0.9, Copyright (c) 2000-2011 the FFmpeg developers
  
        built on Jun 12 2012 20:43:50 with gcc 4.4.3
  
        configuration: --enable-cross-compile --arch=arm --cpu=cortex-a8 --target-os=linux --enable-runtime-cpudetect --prefix=/data/data/org.witness.sscvideoproto --enable-pic --disable-shared --enable-static --cross-prefix=/home/n8fr8/dev/android/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi- --sysroot=/home/n8fr8/dev/android/ndk/platforms/android-3/arch-arm --enable-version3 --enable-gpl --enable-small --enable-memalign-hack --disable-yasm --disable-doc --enable-decoder=mjpeg --enable-decoder=rawvideo --enable-encoder=libx264 --enable-muxer=mp4 --enable-demuxer=image2 --enable-demuxer=mjpeg --enable-demuxer=mp4 --enable-demuxer=mov --enable-parser=mjpeg --enable-filter=buffer --enable-filter=buffersink --enable-filter=drawbox --enable-filter=overlay --enable-filter=redact --enable-protocol=file --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network --enable-libx264 --enable-zlib --extra-cflags=-I../x264 --extra-ldflags=-L../x264 --disabl  libavutil    51. 32. 0 / 51. 32. 0
  
        libavcodec   53. 42. 0 / 53. 42. 0
  
        libavformat  53. 24. 0 / 53. 24. 0
  
        libavfilter   2. 53. 0 /  2. 53. 0
  
        libswscale    2.  1. 0 /  2.  1. 0
  
        libpostproc  51.  2. 0 / 51.  2. 0
  
      [mov,mp4,m4a,3gp,3g2,mj2 @ 0xb05a90] multiple edit list entries, a/v desync might occur, patch welcome
  
  
  
      Seems stream 1 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 43.08 (517/12)
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'j.mp4':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 0
  
          compatible_brands: isom3gp4
  
          creation_time   : 1946-12-04 21:52:33
  
        Duration: 00:00:05.31, start: 0.000000, bitrate: 1584 kb/s
  
          Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 16000 Hz, mono, s16, 96 kb/s
  
          Metadata:
  
            creation_time   : 1946-12-04 21:52:33
  
            handler_name    : SoundHandle
  
          Stream #0:1(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 720x480, 1599 kb/s, SAR 65536:65536 DAR 3:2, 13.97 fps, 43.08 tbr, 90k tbn, 180k tbc
  
          Metadata:
  
            creation_time   : 1946-12-04 21:52:33
  
            handler_name    : VideoHandle
  
      [buffer @ 0xb247f0] w:720 h:480 pixfmt:yuv420p tb:1/1000000 sar:65536/65536 sws_param:
  
      [mpeg @ 0xb23d10] VBV buffer size not set, muxing may fail
  
      Output #0, mpeg, to 'out.mpg':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 0
  
          compatible_brands: isom3gp4
  
          creation_time   : 1946-12-04 21:52:33
  
          encoder         : Lavf53.24.0
  
          Stream #0:0(eng): Video: mpeg2video, yuv420p, 720x480 [SAR 65536:65536 DAR 3:2], q=2-31, 200 kb/s, 90k tbn, 50 tbc
  
          Metadata:
  
            creation_time   : 1946-12-04 21:52:33
  
            handler_name    : VideoHandle
  
          Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 16000 Hz, mono, 96 kb/s
  
          Metadata:
  
            creation_time   : 1946-12-04 21:52:33
  
            handler_name    : SoundHandle
  
      Stream mapping:
  
        Stream #0:1 -> #0:0 (h264 -> mpeg2video)
  
        Stream #0:0 -> #0:1 (copy)
  
      Press [q] to stop, [?] for help
  
      frame=   20 fps=  0 q=0.0 size=      14kB time=00:00:00.38 bitrate= 301.8kbits/s dup=15 frame=   34 fps= 28 q=0.0 size=     132kB time=00:00:00.66 bitrate=1638.4kbits/s dup=25 frame=   45 fps= 25 q=0.0 size=     230kB time=00:00:00.88 bitrate=2141.1kbits/s dup=33 frame=   55 fps= 22 q=0.0 size=     294kB time=00:00:01.08 bitrate=2230.0kbits/s dup=40 frame=   66 fps= 21 q=0.0 size=     306kB time=00:00:01.21 bitrate=2061.5kbits/s dup=48 frame=   79 fps= 21 q=0.0 size=     436kB time=00:00:01.56 bitrate=2289.6kbits/s dup=57 frame=   88 fps= 20 q=0.0 size=     514kB time=00:00:01.74 bitrate=2419.9kbits/s dup=63 frame=  100 fps= 21 q=0.0 size=     584kB time=00:00:01.98 bitrate=2416.2kbits/s dup=71 frame=  110 fps= 20 q=0.0 size=     618kB time=00:00:02.17 bitrate=2326.6kbits/s dup=78 frame=  116 fps= 19 q=0.0 size=     650kB time=00:00:02.24 bitrate=2377.1kbits/s dup=82 frame=  132 fps= 20 q=0.0 size=     830kB time=00:00:02.62 bitrate=2595.2kbits/s dup=94 frame=  144 fps= 20 q=0.0 size=     904kB time=00:00:02.86 bitrate=2589.4kbits/s dup=103frame=  156 fps= 20 q=0.0 size=     970kB time=00:00:03.10 bitrate=2563.3kbits/s dup=112frame=  168 fps= 20 q=0.0 size=    1006kB time=00:00:03.20 bitrate=2575.4kbits/s dup=121frame=  179 fps= 20 q=0.0 size=    1138kB time=00:00:03.56 bitrate=2618.7kbits/s dup=129frame=  191 fps= 20 q=0.0 size=    1240kB time=00:00:03.80 bitrate=2673.2kbits/s dup=138frame=  203 fps= 20 q=0.0 size=    1342kB time=00:00:04.04 bitrate=2721.2kbits/s dup=147frame=  215 fps= 20 q=0.0 size=    1426kB time=00:00:04.22 bitrate=2765.6kbits/s dup=156frame=  227 fps= 20 q=0.0 size=    1536kB time=00:00:04.52 bitrate=2783.8kbits/s dup=165frame=  239 fps= 20 q=0.0 size=    1646kB time=00:00:04.76 bitrate=2832.8kbits/s dup=174frame=  248 fps= 20 q=0.0 size=    1726kB time=00:00:04.94 bitrate=2862.2kbits/s dup=181frame=  248 fps= 19 q=0.0 Lsize=    1738kB time=00:00:04.94 bitrate=2882.1kbits/s dup=181 drop=0
  
      video:1665kB audio:62kB global headers:0kB muxing overhead 0.639219%
  
  
  
      *****************************************                              
  
      Here is the output of the second command
  
      *****************************************
  
  
  
  $ ffmpeg -i out.mpg -vcodec libx264 -acodec copy out1.mp4
  
      ffmpeg version 0.9, Copyright (c) 2000-2011 the FFmpeg developers
  
        built on Jun 12 2012 20:43:50 with gcc 4.4.3
  
        configuration: --enable-cross-compile --arch=arm --cpu=cortex-a8 --target-os=linux --enable-runtime-cpudetect --prefix=/data/data/org.witness.sscvideoproto --enable-pic --disable-shared --enable-static --cross-prefix=/home/n8fr8/dev/android/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi- --sysroot=/home/n8fr8/dev/android/ndk/platforms/android-3/arch-arm --enable-version3 --enable-gpl --enable-small --enable-memalign-hack --disable-yasm --disable-doc --enable-decoder=mjpeg --enable-decoder=rawvideo --enable-encoder=libx264 --enable-muxer=mp4 --enable-demuxer=image2 --enable-demuxer=mjpeg --enable-demuxer=mp4 --enable-demuxer=mov --enable-parser=mjpeg --enable-filter=buffer --enable-filter=buffersink --enable-filter=drawbox --enable-filter=overlay --enable-filter=redact --enable-protocol=file --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network --enable-libx264 --enable-zlib --extra-cflags=-I../x264 --extra-ldflags=-L../x264 --disabl  libavutil    51. 32. 0 / 51. 32. 0
  
        libavcodec   53. 42. 0 / 53. 42. 0
  
        libavformat  53. 24. 0 / 53. 24. 0
  
        libavfilter   2. 53. 0 /  2. 53. 0
  
        libswscale    2.  1. 0 /  2.  1. 0
  
        libpostproc  51.  2. 0 / 51.  2. 0
  
      [mp1 @ 0xb0d420] Header missing
  
          Last message repeated 8 times
  
      [mpeg @ 0xb05a90] Could not find codec parameters (Audio: mp3, 0 channels, s16)
  
      Input #0, mpeg, from 'out.mpg':
  
        Duration: 00:00:05.24, start: 1.000000, bitrate: 2712 kb/s
  
          Stream #0:0[0x1e0]: Video: mpeg2video, yuv420p, 720x480 [SAR 1:1 DAR 3:2], 104857 kb/s, 50 fps, 50 tbr, 90k tbn, 100 tbc
  
          Stream #0:1[0x1c0]: Audio: mp3, 0 channels, s16
  
      [buffer @ 0xb77ca0] w:720 h:480 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
  
      [libx264 @ 0xb0c6e0] using SAR=1/1
  
      [libx264 @ 0xb0c6e0] using cpu capabilities: ARMv6 NEON
  
      [libx264 @ 0xb0c6e0] profile High, level 3.1
  
      [libx264 @ 0xb0c6e0] 264 - core 119 r2113 cc129ad - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - 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=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 'out1.mp4':
  
        Metadata:
  
          encoder         : Lavf53.24.0
  
          Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 720x480 [SAR 1:1 DAR 3:2], q=-1--1, 50 tbn, 50 tbc
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (mpeg2video -> libx264)
  
      Press [q] to stop, [?] for help
  
      frame=  248 fps=  3 q=31.0 Lsize=     419kB time=00:00:04.92 bitrate= 697.5kbits/s
  
      video:415kB audio:0kB global headers:0kB muxing overhead 0.863133%
  
      [libx264 @ 0xb0c6e0] frame I:3     Avg QP:16.46  size:  3927
  
      [libx264 @ 0xb0c6e0] frame P:102   Avg QP:22.91  size:  3884
  
      [libx264 @ 0xb0c6e0] frame B:143   Avg QP:27.16  size:   116
  
      [libx264 @ 0xb0c6e0] consecutive B-frames: 18.1%  8.9% 18.1% 54.8%
  
      [libx264 @ 0xb0c6e0] mb I  I16..4: 56.3% 42.7%  1.0%
  
      [libx264 @ 0xb0c6e0] mb P  I16..4:  6.1%  9.9%  0.6%  P16..4: 33.2%  4.9%  2.2%  0.0%  0.0%    skip:43.1%
  
      [libx264 @ 0xb0c6e0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  6.7%  0.0%  0.0%  direct: 0.1%  skip:93.2%  L0:53.5% L1:45.4% BI: 1.2%
  
      [libx264 @ 0xb0c6e0] 8x8 transform intra:57.0% inter:85.5%
  
      [libx264 @ 0xb0c6e0] coded y,uvDC,uvAC intra: 36.0% 71.6% 24.9% inter: 4.4% 11.6% 0.6%
  
      [libx264 @ 0xb0c6e0] i16 v,h,dc,p: 35% 21% 10% 34%
  
      [libx264 @ 0xb0c6e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 22% 34%  3%  3%  4%  2%  4%  5%
  
      [libx264 @ 0xb0c6e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 19% 11%  4% 12% 12%  7%  5%  6%
  
      [libx264 @ 0xb0c6e0] i8c dc,h,v,p: 49% 22% 22%  7%
  
      [libx264 @ 0xb0c6e0] Weighted P-Frames: Y:2.9% UV:2.0%
  
      [libx264 @ 0xb0c6e0] ref P L0: 79.5%  8.1%  9.8%  2.5%  0.0%
  
      [libx264 @ 0xb0c6e0] ref B L0: 91.9%  7.5%  0.6%
  
      [libx264 @ 0xb0c6e0] ref B L1: 94.8%  5.2%
  
      [libx264 @ 0xb0c6e0] kb/s:684.84