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• Open Media Developers Track at OVC 2011

  11 octobre 2011, par silvia

  The Open Video Conference that took place on 10-12 September was so overwhelming, I’ve still not been able to catch my breath ! It was a dense three days for me, even though I only focused on the technology sessions of the conference and utterly missed out on all the policy and content discussions.

  Roughly 60 people participated in the Open Media Software (OMS) developers track. This was an amazing group of people capable and willing to shape the future of video technology on the Web :

  • HTML5 video developers from Apple, Google, Opera, and Mozilla (though we missed the NZ folks),
  • codec developers from WebM, Xiph, and MPEG,
  • Web video developers from YouTube, JWPlayer, Kaltura, VideoJS, PopcornJS, etc.,
  • content publishers from Wikipedia, Internet Archive, YouTube, Netflix, etc.,
  • open source tool developers from FFmpeg, gstreamer, flumotion, VideoLAN, PiTiVi, etc,
  • and many more.

  To provide a summary of all the discussions would be impossible, so I just want to share the key take-aways that I had from the main sessions.

  WebRTC : Realtime Communications and HTML5

  Tim Terriberry (Mozilla), Serge Lachapelle (Google) and Ethan Hugg (CISCO) moderated this session together (slides). There are activities both at the W3C and at IETF – the ones at IETF are supposed to focus on protocols, while the W3C ones on HTML5 extensions.

  The current proposal of a PeerConnection API has been implemented in WebKit/Chrome as open source. It is expected that Firefox will have an add-on by Q1 next year. It enables video conferencing, including media capture, media encoding, signal processing (echo cancellation etc), secure transmission, and a data stream exchange.

  Current discussions are around the signalling protocol and whether SIP needs to be required by the standard. Further, the codec question is under discussion with a question whether to mandate VP8 and Opus, since transcoding gateways are not desirable. Another question is how to measure the quality of the connection and how to report errors so as to allow adaptation.

  What always amazes me around RTC is the sheer number of specialised protocols that seem to be required to implement this. WebRTC does not disappoint : in fact, the question was asked whether there could be a lighter alternative than to re-use dozens of years of protocol development – is it over-engineered ? Can desktop players connect to a WebRTC session ?

  We are already in a second or third revision of this part of the HTML5 specification and yet it seems the requirements are still being collected. I’m quietly confident that everything is done to make the lives of the Web developer easier, but it sure looks like a huge task.

  The Missing Link : Flash to HTML5

  Zohar Babin (Kaltura) and myself moderated this session and I must admit that this session was the biggest eye-opener for me amongst all the sessions. There was a large number of Flash developers present in the room and that was great, because sometimes we just don’t listen enough to lessons learnt in the past.

  This session gave me one of those aha-moments : it the form of the Flash appendBytes() API function.

  The appendBytes() function allows a Flash developer to take a byteArray out of a connected video resource and do something with it – such as feed it to a video for display. When I heard that Web developers want that functionality for JavaScript and the video element, too, I instinctively rejected the idea wondering why on earth would a Web developer want to touch encoded video bytes – why not leave that to the browser.

  But as it turns out, this is actually a really powerful enabler of functionality. For example, you can use it to :

  • display mid-roll video ads as part of the same video element,
  • sequence playlists of videos into the same video element,
  • implement DVR functionality (high-speed seeking),
  • do mash-ups,
  • do video editing,
  • adaptive streaming.

  This totally blew my mind and I am now completely supportive of having such a function in HTML5. Together with media fragment URIs you could even leave all the header download management for resources to the Web browser and just request time ranges from a video through an appendBytes() function. This would be easier on the Web developer than having to deal with byte ranges and making sure that appropriate decoding pipelines are set up.

  Standards for Video Accessibility

  Philip Jagenstedt (Opera) and myself moderated this session. We focused on the HTML5 track element and the WebVTT file format. Many issues were identified that will still require work.

  One particular topic was to find a standard means of rendering the UI for caption, subtitle, und description selection. For example, what icons should be used to indicate that subtitles or captions are available. While this is not part of the HTML5 specification, it’s still important to get this right across browsers since otherwise users will get confused with diverging interfaces.

  Chaptering was discussed and a particular need to allow URLs to directly point at chapters was expressed. I suggested the use of named Media Fragment URLs.

  The use of WebVTT for descriptions for the blind was also discussed. A suggestion was made to use the voice tag <v> to allow for “styling” (i.e. selection) of the screen reader voice.

  Finally, multitrack audio or video resources were also discussed and the @mediagroup attribute was explained. A question about how to identify the language used in different alternative dubs was asked. This is an issue because @srclang is not on audio or video, only on text, so it’s a missing feature for the multitrack API.

  Beyond this session, there was also a breakout session on WebVTT and the track element. As a consequence, a number of bugs were registered in the W3C bug tracker.

  WebM : Testing, Metrics and New features

  This session was moderated by John Luther and John Koleszar, both of the WebM Project. They started off with a presentation on current work on WebM, which includes quality testing and improvements, and encoder speed improvement. Then they moved on to questions about how to involve the community more.

  The community criticised that communication of what is happening around WebM is very scarce. More sharing of information was requested, including a move to using open Google+ hangouts instead of Google internal video conferences. More use of the public bug tracker can also help include the community better.

  Another pain point of the community was that code is introduced and removed without much feedback. It was requested to introduce a peer review process. Also it was requested that example code snippets are published when new features are announced so others can replicate the claims.

  This all indicates to me that the WebM project is increasingly more open, but that there is still a lot to learn.

  Standards for HTTP Adaptive Streaming

  This session was moderated by Frank Galligan and Aaron Colwell (Google), and Mark Watson (Netflix).

  Mark started off by giving us an introduction to MPEG DASH, the MPEG file format for HTTP adaptive streaming. MPEG has just finalized the format and he was able to show us some examples. DASH is XML-based and thus rather verbose. It is covering all eventualities of what parameters could be switched during transmissions, which makes it very broad. These include trick modes e.g. for fast forwarding, 3D, multi-view and multitrack content.

  MPEG have defined profiles – one for live streaming which requires chunking of the files on the server, and one for on-demand which requires keyframe alignment of the files. There are clear specifications for how to do these with MPEG. Such profiles would need to be created for WebM and Ogg Theora, too, to make DASH universally applicable.

  Further, the Web case needs a more restrictive adaptation approach, since the video element’s API is already accounting for some of the features that DASH provides for desktop applications. So, a Web-specific profile of DASH would be required.

  Then Aaron introduced us to the MediaSource API and in particular the webkitSourceAppend() extension that he has been experimenting with. It is essentially an implementation of the appendBytes() function of Flash, which the Web developers had been asking for just a few sessions earlier. This was likely the biggest announcement of OVC, alas a quiet and technically-focused one.

  Aaron explained that he had been trying to find a way to implement HTTP adaptive streaming into WebKit in a way in which it could be standardised. While doing so, he also came across other requirements around such chunked video handling, in particular around dynamic ad insertion, live streaming, DVR functionality (fast forward), constraint video editing, and mashups. While trying to sort out all these requirements, it became clear that it would be very difficult to implement strategies for stream switching, buffering and delivery of video chunks into the browser when so many different and likely contradictory requirements exist. Also, once an approach is implemented and specified for the browser, it becomes very difficult to innovate on it.

  Instead, the easiest way to solve it right now and learn about what would be necessary to implement into the browser would be to actually allow Web developers to queue up a chunk of encoded video into a video element for decoding and display. Thus, the webkitSourceAppend() function was born (specification).

  The proposed extension to the HTMLMediaElement is as follows :

  partial interface HTMLMediaElement 
    // URL passed to src attribute to enable the media source logic.
    readonly attribute [URL] DOMString webkitMediaSourceURL ;
    bool webkitSourceAppend(in Uint8Array data) ;
    // end of stream status codes.
  
    const unsigned short EOS_NO_ERROR = 0 ;
  
    const unsigned short EOS_NETWORK_ERR = 1 ;
  
    const unsigned short EOS_DECODE_ERR = 2 ;
    void webkitSourceEndOfStream(in unsigned short status) ;
    // states
  
    const unsigned short SOURCE_CLOSED = 0 ;
  
    const unsigned short SOURCE_OPEN = 1 ;
  
    const unsigned short SOURCE_ENDED = 2 ;
    readonly attribute unsigned short webkitSourceState ;
  
   ;
  

  The code is already checked into WebKit, but commented out behind a command-line compiler flag.

  Frank then stepped forward to show how webkitSourceAppend() can be used to implement HTTP adaptive streaming. His example uses WebM – there are no examples with MPEG or Ogg yet.

  The chunks that Frank’s demo used were 150 video frames long (6.25s) and 5s long audio. Stream switching only switched video, since audio data is much lower bandwidth and more important to retain at high quality. Switching was done on multiplexed files.

  Every chunk requires an XHR range request – this could be optimised if the connections were kept open per adaptation. Seeking works, too, but since decoding requires download of a whole chunk, seeking latency is determined by the time it takes to download and decode that chunk.

  Similar to DASH, when using this approach for live streaming, the server has to produce one file per chunk, since byte range requests are not possible on a continuously growing file.

  Frank did not use DASH as the manifest format for his HTTP adaptive streaming demo, but instead used a hacked-up custom XML format. It would be possible to use JSON or any other format, too.

  After this session, I was actually completely blown away by the possibilities that such a simple API extension allows. If I wasn’t sold on the idea of a appendBytes() function in the earlier session, this one completely changed my mind. While I still believe we need to standardise a HTTP adaptive streaming file format that all browsers will support for all codecs, and I still believe that a native implementation for support of such a file format is necessary, I also believe that this approach of webkitSourceAppend() is what HTML needs – and maybe it needs it faster than native HTTP adaptive streaming support.

  Standards for Browser Video Playback Metrics

  This session was moderated by Zachary Ozer and Pablo Schklowsky (JWPlayer). Their motivation for the topic was, in fact, also HTTP adaptive streaming. Once you leave the decisions about when to do stream switching to JavaScript (through a function such a wekitSourceAppend()), you have to expose stream metrics to the JS developer so they can make informed decisions. The other use cases is, of course, monitoring of the quality of video delivery for reporting to the provider, who may then decide to change their delivery environment.

  The discussion found that we really care about metrics on three different levels :

  • measuring the network performance (bandwidth)
  • measuring the decoding pipeline performance
  • measuring the display quality

  In the end, it seemed that work previously done by Steve Lacey on a proposal for video metrics was generally acceptable, except for the playbackJitter metric, which may be too aggregate to mean much.

  Device Inputs / A/V in the Browser

  I didn’t actually attend this session held by Anant Narayanan (Mozilla), but from what I heard, the discussion focused on how to manage permission of access to video camera, microphone and screen, e.g. when multiple applications (tabs) want access or when the same site wants access in a different session. This may apply to real-time communication with screen sharing, but also to photo sharing, video upload, or canvas access to devices e.g. for time lapse photography.

  Open Video Editors

  This was another session that I wasn’t able to attend, but I believe the creation of good open source video editing software and similar video creation software is really crucial to giving video a broader user appeal.

  Jeff Fortin (PiTiVi) moderated this session and I was fascinated to later see his analysis of the lifecycle of open source video editors. It is shocking to see how many people/projects have tried to create an open source video editor and how many have stopped their project. It is likely that the creation of a video editor is such a complex challenge that it requires a larger and more committed open source project – single people will just run out of steam too quickly. This may be comparable to the creation of a Web browser (see the size of the Mozilla project) or a text processing system (see the size of the OpenOffice project).

  Jeff also mentioned the need to create open video editor standards around playlist file formats etc. Possibly the Open Video Alliance could help. In any case, something has to be done in this space – maybe this would be a good topic to focus next year’s OVC on ?

  Monday’s Breakout Groups

  The conference ended officially on Sunday night, but we had a third day of discussions / hackday at the wonderful New York Lawschool venue. We had collected issues of interest during the two previous days and organised the breakout groups on the morning (Schedule).

  In the Content Protection/DRM session, Mark Watson from Netflix explained how their API works and that they believe that all we need in browsers is a secure way to exchange keys and an indicator of protection scheme is used – the actual protection scheme would not be implemented by the browser, but be provided by the underlying system (media framework/operating system). I think that until somebody actually implements something in a browser fork and shows how this can be done, we won’t have much progress. In my understanding, we may also need to disable part of the video API for encrypted content, because otherwise you can always e.g. grab frames from the video element into canvas and save them from there.

  In the Playlists and Gapless Playback session, there was massive brainstorming about what new cool things can be done with the video element in browsers if playback between snippets can be made seamless. Further discussions were about a standard playlist file formats (such as XSPF, MRSS or M3U), media fragment URIs in playlists for mashups, and the need to expose track metadata for HTML5 media elements.

  What more can I say ? It was an amazing three days and the complexity of problems that we’re dealing with is a tribute to how far HTML5 and open video has already come and exciting news for the kind of applications that will be possible (both professional and community) once we’ve solved the problems of today. It will be exciting to see what progress we will have made by next year’s conference.

  Thanks go to Google for sponsoring my trip to OVC.

  UPDATE : We actually have a mailing list for open media developers who are interested in these and similar topics – do join at http://lists.annodex.net/cgi-bin/mailman/listinfo/foms.

• cannot convert FLV to MP4 despite compiling ffmpeg with all codecs

  1er novembre 2013, par Rubytastic

  Try to convert FLV to MP4 with below params, but it always fails. I included also list of codeces that are compiled in. Why It will not convert the FLV to MP4, who knows ?

   ffmpeg -y -i stream2.flv -acodec libmp3lame -ar 44100 -ac 1 -vcodec libx264 stream2.mp4;
  
  ffmpeg version git-2013-11-01-64a0ed1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Nov  1 2013 14:44:29 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-3)
  
    configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
  
    libavutil      52. 49.100 / 52. 49.100
  
    libavcodec     55. 40.100 / 55. 40.100
  
    libavformat    55. 20.100 / 55. 20.100
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.100 /  3. 90.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, flv, from 'stream2.flv':
  
    Duration: 00:00:01.60, start: 0.000000, bitrate: 636 kb/s
  
      Stream #0:0: Video: h264 (Baseline), yuv420p(tv), 640x480 [SAR 1:1 DAR 4:3], 11.92 tbr, 1k tbn, 60 tbc
  
      Stream #0:1: Audio: speex, 16000 Hz, mono
  
  [graph 1 input from stream 0:1 @ 0xb000d40] Invalid sample format (null)
  
  Error opening filters!

  i followed the official compile documentation with all the codes, this is my full codec list :

  ffmpeg version git-2013-11-01-64a0ed1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Nov  1 2013 14:44:29 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-3)
  
    configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
  
    libavutil      52. 49.100 / 52. 49.100
  
    libavcodec     55. 40.100 / 55. 40.100
  
    libavformat    55. 20.100 / 55. 20.100
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.100 /  3. 90.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Codecs:
  
   D..... = Decoding supported
  
   .E.... = Encoding supported
  
   ..V... = Video codec
  
   ..A... = Audio codec
  
   ..S... = Subtitle codec
  
   ...I.. = Intra frame-only codec
  
   ....L. = Lossy compression
  
   .....S = Lossless compression
  
   -------
  
   D.VI.. 012v                 Uncompressed 4:2:2 10-bit
  
   D.V.L. 4xm                  4X Movie
  
   D.VI.S 8bps                 QuickTime 8BPS video
  
   .EVIL. a64_multi            Multicolor charset for Commodore 64 (encoders: a64multi )
  
   .EVIL. a64_multi5           Multicolor charset for Commodore 64, extended with 5th color (colram) (encoders: a64multi5 )
  
   D.V..S aasc                 Autodesk RLE
  
   D.VIL. aic                  Apple Intermediate Codec
  
   DEVIL. amv                  AMV Video
  
   D.V.L. anm                  Deluxe Paint Animation
  
   D.V.L. ansi                 ASCII/ANSI art
  
   DEVIL. asv1                 ASUS V1
  
   DEVIL. asv2                 ASUS V2
  
   D.VIL. aura                 Auravision AURA
  
   D.VIL. aura2                Auravision Aura 2
  
   D.V... avrn                 Avid AVI Codec
  
   DEVI.. avrp                 Avid 1:1 10-bit RGB Packer
  
   D.V.L. avs                  AVS (Audio Video Standard) video
  
   DEVI.. avui                 Avid Meridien Uncompressed
  
   DEVI.. ayuv                 Uncompressed packed MS 4:4:4:4
  
   D.V.L. bethsoftvid          Bethesda VID video
  
   D.V.L. bfi                  Brute Force & Ignorance
  
   D.V.L. binkvideo            Bink video
  
   D.VI.. bintext              Binary text
  
   DEVI.S bmp                  BMP (Windows and OS/2 bitmap)
  
   D.V..S bmv_video            Discworld II BMV video
  
   D.VI.S brender_pix          BRender PIX image
  
   D.V.L. c93                  Interplay C93
  
   D.V.L. cavs                 Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)
  
   D.V.L. cdgraphics           CD Graphics video
  
   D.VIL. cdxl                 Commodore CDXL video
  
   D.V.L. cinepak              Cinepak
  
   DEVIL. cljr                 Cirrus Logic AccuPak
  
   D.VI.S cllc                 Canopus Lossless Codec
  
   D.V.L. cmv                  Electronic Arts CMV video (decoders: eacmv )
  
   D.V... cpia                 CPiA video format
  
   D.V..S cscd                 CamStudio (decoders: camstudio )
  
   D.VIL. cyuv                 Creative YUV (CYUV)
  
   D.V.L. dfa                  Chronomaster DFA
  
   D.V.LS dirac                Dirac
  
   DEVIL. dnxhd                VC3/DNxHD
  
   DEVI.S dpx                  DPX (Digital Picture Exchange) image
  
   D.V.L. dsicinvideo          Delphine Software International CIN video
  
   DEVIL. dvvideo              DV (Digital Video)
  
   D.V..S dxa                  Feeble Files/ScummVM DXA
  
   D.VI.S dxtory               Dxtory
  
   D.V.L. escape124            Escape 124
  
   D.V.L. escape130            Escape 130
  
   D.VILS exr                  OpenEXR image
  
   DEV..S ffv1                 FFmpeg video codec #1
  
   DEVI.S ffvhuff              Huffyuv FFmpeg variant
  
   DEV..S flashsv              Flash Screen Video v1
  
   DEV.L. flashsv2             Flash Screen Video v2
  
   D.V..S flic                 Autodesk Animator Flic video
  
   DEV.L. flv1                 FLV / Sorenson Spark / Sorenson H.263 (Flash Video) (decoders: flv ) (encoders: flv )
  
   D.V..S fraps                Fraps
  
   D.VI.S frwu                 Forward Uncompressed
  
   D.V.L. g2m                  Go2Meeting
  
   DEV..S gif                  GIF (Graphics Interchange Format)
  
   DEV.L. h261                 H.261
  
   DEV.L. h263                 H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2
  
   D.V.L. h263i                Intel H.263
  
   DEV.L. h263p                H.263+ / H.263-1998 / H.263 version 2
  
   DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (encoders: libx264 libx264rgb )
  
   D.V.LS hevc                 H.265 / HEVC
  
   D.V.L. hnm4video            HNM 4 video
  
   DEVI.S huffyuv              HuffYUV
  
   D.V.L. idcin                id Quake II CIN video (decoders: idcinvideo )
  
   D.VI.. idf                  iCEDraw text
  
   D.V.L. iff_byterun1         IFF ByteRun1 (decoders: iff )
  
   D.V.L. iff_ilbm             IFF ILBM (decoders: iff )
  
   D.V.L. indeo2               Intel Indeo 2
  
   D.V.L. indeo3               Intel Indeo 3
  
   D.V.L. indeo4               Intel Indeo Video Interactive 4
  
   D.V.L. indeo5               Intel Indeo Video Interactive 5
  
   D.V.L. interplayvideo       Interplay MVE video
  
   DEVILS jpeg2000             JPEG 2000
  
   DEVILS jpegls               JPEG-LS
  
   D.VIL. jv                   Bitmap Brothers JV video
  
   D.V.L. kgv1                 Kega Game Video
  
   D.V.L. kmvc                 Karl Morton's video codec
  
   D.VI.S lagarith             Lagarith lossless
  
   .EVI.S ljpeg                Lossless JPEG
  
   D.VI.S loco                 LOCO
  
   D.V.L. mad                  Electronic Arts Madcow Video (decoders: eamad )
  
   D.VIL. mdec                 Sony PlayStation MDEC (Motion DECoder)
  
   D.V.L. mimic                Mimic
  
   DEVIL. mjpeg                Motion JPEG
  
   D.VIL. mjpegb               Apple MJPEG-B
  
   D.V.L. mmvideo              American Laser Games MM Video
  
   D.V.L. motionpixels         Motion Pixels video
  
   DEV.L. mpeg1video           MPEG-1 video
  
   DEV.L. mpeg2video           MPEG-2 video (decoders: mpeg2video mpegvideo )
  
   DEV.L. mpeg4                MPEG-4 part 2
  
   ..V.L. mpegvideo_xvmc       MPEG-1/2 video XvMC (X-Video Motion Compensation)
  
   D.V.L. msa1                 MS ATC Screen
  
   D.V.L. msmpeg4v1            MPEG-4 part 2 Microsoft variant version 1
  
   DEV.L. msmpeg4v2            MPEG-4 part 2 Microsoft variant version 2
  
   DEV.L. msmpeg4v3            MPEG-4 part 2 Microsoft variant version 3 (decoders: msmpeg4 ) (encoders: msmpeg4 )
  
   D.V..S msrle                Microsoft RLE
  
   D.V.L. mss1                 MS Screen 1
  
   D.VIL. mss2                 MS Windows Media Video V9 Screen
  
   DEV.L. msvideo1             Microsoft Video 1
  
   D.VI.S mszh                 LCL (LossLess Codec Library) MSZH
  
   D.V.L. mts2                 MS Expression Encoder Screen
  
   D.VIL. mvc1                 Silicon Graphics Motion Video Compressor 1
  
   D.VIL. mvc2                 Silicon Graphics Motion Video Compressor 2
  
   D.V.L. mxpeg                Mobotix MxPEG video
  
   D.V.L. nuv                  NuppelVideo/RTJPEG
  
   D.V.L. paf_video            Amazing Studio Packed Animation File Video
  
   DEVI.S pam                  PAM (Portable AnyMap) image
  
   DEVI.S pbm                  PBM (Portable BitMap) image
  
   DEVI.S pcx                  PC Paintbrush PCX image
  
   DEVI.S pgm                  PGM (Portable GrayMap) image
  
   DEVI.S pgmyuv               PGMYUV (Portable GrayMap YUV) image
  
   D.VIL. pictor               Pictor/PC Paint
  
   DEV..S png                  PNG (Portable Network Graphics) image
  
   DEVI.S ppm                  PPM (Portable PixelMap) image
  
   DEVIL. prores               Apple ProRes (iCodec Pro) (decoders: prores prores_lgpl ) (encoders: prores prores_aw prores_ks )
  
   D.VIL. ptx                  V.Flash PTX image
  
   D.VI.S qdraw                Apple QuickDraw
  
   D.V.L. qpeg                 Q-team QPEG
  
   DEV..S qtrle                QuickTime Animation (RLE) video
  
   DEVI.S r10k                 AJA Kona 10-bit RGB Codec
  
   DEVI.S r210                 Uncompressed RGB 10-bit
  
   DEVI.S rawvideo             raw video
  
   D.VIL. rl2                  RL2 video
  
   DEV.L. roq                  id RoQ video (decoders: roqvideo ) (encoders: roqvideo )
  
   D.V.L. rpza                 QuickTime video (RPZA)
  
   DEV.L. rv10                 RealVideo 1.0
  
   DEV.L. rv20                 RealVideo 2.0
  
   D.V.L. rv30                 RealVideo 3.0
  
   D.V.L. rv40                 RealVideo 4.0
  
   D.V.L. sanm                 LucasArts SMUSH video
  
   DEVI.S sgi                  SGI image
  
   D.VI.S sgirle               SGI RLE 8-bit
  
   D.V.L. smackvideo           Smacker video (decoders: smackvid )
  
   D.V.L. smc                  QuickTime Graphics (SMC)
  
   D.V... smv                  Sigmatel Motion Video (decoders: smvjpeg )
  
   DEV.LS snow                 Snow
  
   D.VIL. sp5x                 Sunplus JPEG (SP5X)
  
   DEVI.S sunrast              Sun Rasterfile image
  
   DEV.L. svq1                 Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1
  
   D.V.L. svq3                 Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3
  
   DEVI.S targa                Truevision Targa image
  
   D.VI.. targa_y216           Pinnacle TARGA CineWave YUV16
  
   D.V.L. tgq                  Electronic Arts TGQ video (decoders: eatgq )
  
   D.V.L. tgv                  Electronic Arts TGV video (decoders: eatgv )
  
   D.V.L. theora               Theora
  
   D.VIL. thp                  Nintendo Gamecube THP video
  
   D.V.L. tiertexseqvideo      Tiertex Limited SEQ video
  
   DEVI.S tiff                 TIFF image
  
   D.VIL. tmv                  8088flex TMV
  
   D.V.L. tqi                  Electronic Arts TQI video (decoders: eatqi )
  
   D.V.L. truemotion1          Duck TrueMotion 1.0
  
   D.V.L. truemotion2          Duck TrueMotion 2.0
  
   D.V..S tscc                 TechSmith Screen Capture Codec (decoders: camtasia )
  
   D.V.L. tscc2                TechSmith Screen Codec 2
  
   D.VIL. txd                  Renderware TXD (TeXture Dictionary) image
  
   D.V.L. ulti                 IBM UltiMotion (decoders: ultimotion )
  
   DEVI.S utvideo              Ut Video
  
   DEVI.S v210                 Uncompressed 4:2:2 10-bit
  
   D.VI.S v210x                
  
   DEVI.. v308                 Uncompressed packed 4:4:4
  
   DEVI.. v408                 Uncompressed packed QT 4:4:4:4
  
   DEVI.S v410                 Uncompressed 4:4:4 10-bit
  
   D.V.L. vb                   Beam Software VB
  
   D.VI.S vble                 VBLE Lossless Codec
  
   D.V.L. vc1                  SMPTE VC-1
  
   D.V.L. vc1image             Windows Media Video 9 Image v2
  
   D.VIL. vcr1                 ATI VCR1
  
   D.VIL. vixl                 Miro VideoXL (decoders: xl )
  
   D.V.L. vmdvideo             Sierra VMD video
  
   D.V..S vmnc                 VMware Screen Codec / VMware Video
  
   D.V.L. vp3                  On2 VP3
  
   D.V.L. vp5                  On2 VP5
  
   D.V.L. vp6                  On2 VP6
  
   D.V.L. vp6a                 On2 VP6 (Flash version, with alpha channel)
  
   D.V.L. vp6f                 On2 VP6 (Flash version)
  
   DEV.L. vp8                  On2 VP8 (decoders: vp8 libvpx ) (encoders: libvpx )
  
   DEV.L. vp9                  Google VP9 (decoders: vp9 libvpx-vp9 ) (encoders: libvpx-vp9 )
  
   D.VILS webp                 WebP
  
   DEV.L. wmv1                 Windows Media Video 7
  
   DEV.L. wmv2                 Windows Media Video 8
  
   D.V.L. wmv3                 Windows Media Video 9
  
   D.V.L. wmv3image            Windows Media Video 9 Image
  
   D.VIL. wnv1                 Winnov WNV1
  
   D.V.L. ws_vqa               Westwood Studios VQA (Vector Quantized Animation) video (decoders: vqavideo )
  
   D.V.L. xan_wc3              Wing Commander III / Xan
  
   D.V.L. xan_wc4              Wing Commander IV / Xxan
  
   D.VI.. xbin                 eXtended BINary text
  
   DEVI.S xbm                  XBM (X BitMap) image
  
   DEVIL. xface                X-face image
  
   DEVI.S xwd                  XWD (X Window Dump) image
  
   DEVI.. y41p                 Uncompressed YUV 4:1:1 12-bit
  
   D.V.L. yop                  Psygnosis YOP Video
  
   DEVI.. yuv4                 Uncompressed packed 4:2:0
  
   D.V..S zerocodec            ZeroCodec Lossless Video
  
   DEVI.S zlib                 LCL (LossLess Codec Library) ZLIB
  
   DEV..S zmbv                 Zip Motion Blocks Video
  
   D.A.L. 8svx_exp             8SVX exponential
  
   D.A.L. 8svx_fib             8SVX fibonacci
  
   DEA.L. aac                  AAC (Advanced Audio Coding) (decoders: aac libfdk_aac ) (encoders: aac libfdk_aac )
  
   D.A.L. aac_latm             AAC LATM (Advanced Audio Coding LATM syntax)
  
   DEA.L. ac3                  ATSC A/52A (AC-3) (encoders: ac3 ac3_fixed )
  
   D.A.L. adpcm_4xm            ADPCM 4X Movie
  
   DEA.L. adpcm_adx            SEGA CRI ADX ADPCM
  
   D.A.L. adpcm_afc            ADPCM Nintendo Gamecube AFC
  
   D.A.L. adpcm_ct             ADPCM Creative Technology
  
   D.A.L. adpcm_dtk            ADPCM Nintendo Gamecube DTK
  
   D.A.L. adpcm_ea             ADPCM Electronic Arts
  
   D.A.L. adpcm_ea_maxis_xa    ADPCM Electronic Arts Maxis CDROM XA
  
   D.A.L. adpcm_ea_r1          ADPCM Electronic Arts R1
  
   D.A.L. adpcm_ea_r2          ADPCM Electronic Arts R2
  
   D.A.L. adpcm_ea_r3          ADPCM Electronic Arts R3
  
   D.A.L. adpcm_ea_xas         ADPCM Electronic Arts XAS
  
   DEA.L. adpcm_g722           G.722 ADPCM (decoders: g722 ) (encoders: g722 )
  
   DEA.L. adpcm_g726           G.726 ADPCM (decoders: g726 ) (encoders: g726 )
  
   D.A.L. adpcm_g726le         G.726 ADPCM little-endian (decoders: g726le )
  
   D.A.L. adpcm_ima_amv        ADPCM IMA AMV
  
   D.A.L. adpcm_ima_apc        ADPCM IMA CRYO APC
  
   D.A.L. adpcm_ima_dk3        ADPCM IMA Duck DK3
  
   D.A.L. adpcm_ima_dk4        ADPCM IMA Duck DK4
  
   D.A.L. adpcm_ima_ea_eacs    ADPCM IMA Electronic Arts EACS
  
   D.A.L. adpcm_ima_ea_sead    ADPCM IMA Electronic Arts SEAD
  
   D.A.L. adpcm_ima_iss        ADPCM IMA Funcom ISS
  
   D.A.L. adpcm_ima_oki        ADPCM IMA Dialogic OKI
  
   DEA.L. adpcm_ima_qt         ADPCM IMA QuickTime
  
   D.A.L. adpcm_ima_rad        ADPCM IMA Radical
  
   D.A.L. adpcm_ima_smjpeg     ADPCM IMA Loki SDL MJPEG
  
   DEA.L. adpcm_ima_wav        ADPCM IMA WAV
  
   D.A.L. adpcm_ima_ws         ADPCM IMA Westwood
  
   DEA.L. adpcm_ms             ADPCM Microsoft
  
   D.A.L. adpcm_sbpro_2        ADPCM Sound Blaster Pro 2-bit
  
   D.A.L. adpcm_sbpro_3        ADPCM Sound Blaster Pro 2.6-bit
  
   D.A.L. adpcm_sbpro_4        ADPCM Sound Blaster Pro 4-bit
  
   DEA.L. adpcm_swf            ADPCM Shockwave Flash
  
   D.A.L. adpcm_thp            ADPCM Nintendo Gamecube THP
  
   D.A.L. adpcm_xa             ADPCM CDROM XA
  
   DEA.L. adpcm_yamaha         ADPCM Yamaha
  
   DEA..S alac                 ALAC (Apple Lossless Audio Codec)
  
   D.A.L. amr_nb               AMR-NB (Adaptive Multi-Rate NarrowBand) (decoders: amrnb )
  
   D.A.L. amr_wb               AMR-WB (Adaptive Multi-Rate WideBand) (decoders: amrwb )
  
   D.A..S ape                  Monkey's Audio
  
   D.A.L. atrac1               ATRAC1 (Adaptive TRansform Acoustic Coding)
  
   D.A.L. atrac3               ATRAC3 (Adaptive TRansform Acoustic Coding 3)
  
   ..A.L. atrac3p              ATRAC3+ (Adaptive TRansform Acoustic Coding 3+)
  
   D.A.L. binkaudio_dct        Bink Audio (DCT)
  
   D.A.L. binkaudio_rdft       Bink Audio (RDFT)
  
   D.A.L. bmv_audio            Discworld II BMV audio
  
   ..A.L. celt                 Constrained Energy Lapped Transform (CELT)
  
   DEA.L. comfortnoise         RFC 3389 Comfort Noise
  
   D.A.L. cook                 Cook / Cooker / Gecko (RealAudio G2)
  
   D.A.L. dsicinaudio          Delphine Software International CIN audio
  
   DEA.LS dts                  DCA (DTS Coherent Acoustics) (decoders: dca ) (encoders: dca )
  
   ..A.L. dvaudio              
  
   DEA.L. eac3                 ATSC A/52B (AC-3, E-AC-3)
  
   D.A.L. evrc                 EVRC (Enhanced Variable Rate Codec)
  
   DEA..S flac                 FLAC (Free Lossless Audio Codec)
  
   DEA.L. g723_1               G.723.1
  
   D.A.L. g729                 G.729
  
   D.A.L. gsm                  GSM
  
   D.A.L. gsm_ms               GSM Microsoft variant
  
   D.A.L. iac                  IAC (Indeo Audio Coder)
  
   ..A.L. ilbc                 iLBC (Internet Low Bitrate Codec)
  
   D.A.L. imc                  IMC (Intel Music Coder)
  
   D.A.L. interplay_dpcm       DPCM Interplay
  
   D.A.L. mace3                MACE (Macintosh Audio Compression/Expansion) 3:1
  
   D.A.L. mace6                MACE (Macintosh Audio Compression/Expansion) 6:1
  
   D.A.L. metasound            Voxware MetaSound
  
   D.A..S mlp                  MLP (Meridian Lossless Packing)
  
   D.A.L. mp1                  MP1 (MPEG audio layer 1) (decoders: mp1 mp1float )
  
   DEA.L. mp2                  MP2 (MPEG audio layer 2) (decoders: mp2 mp2float )
  
   DEA.L. mp3                  MP3 (MPEG audio layer 3) (decoders: mp3 mp3float ) (encoders: libmp3lame )
  
   D.A.L. mp3adu               ADU (Application Data Unit) MP3 (MPEG audio layer 3) (decoders: mp3adu mp3adufloat )
  
   D.A.L. mp3on4               MP3onMP4 (decoders: mp3on4 mp3on4float )
  
   D.A..S mp4als               MPEG-4 Audio Lossless Coding (ALS) (decoders: als )
  
   D.A.L. musepack7            Musepack SV7 (decoders: mpc7 )
  
   D.A.L. musepack8            Musepack SV8 (decoders: mpc8 )
  
   DEA.L. nellymoser           Nellymoser Asao
  
   DEA.L. opus                 Opus (Opus Interactive Audio Codec) (decoders: libopus ) (encoders: libopus )
  
   D.A.L. paf_audio            Amazing Studio Packed Animation File Audio
  
   DEA.L. pcm_alaw             PCM A-law / G.711 A-law
  
   D.A..S pcm_bluray           PCM signed 16|20|24-bit big-endian for Blu-ray media
  
   D.A..S pcm_dvd              PCM signed 20|24-bit big-endian
  
   DEA..S pcm_f32be            PCM 32-bit floating point big-endian
  
   DEA..S pcm_f32le            PCM 32-bit floating point little-endian
  
   DEA..S pcm_f64be            PCM 64-bit floating point big-endian
  
   DEA..S pcm_f64le            PCM 64-bit floating point little-endian
  
   D.A..S pcm_lxf              PCM signed 20-bit little-endian planar
  
   DEA.L. pcm_mulaw            PCM mu-law / G.711 mu-law
  
   DEA..S pcm_s16be            PCM signed 16-bit big-endian
  
   DEA..S pcm_s16be_planar     PCM signed 16-bit big-endian planar
  
   DEA..S pcm_s16le            PCM signed 16-bit little-endian
  
   DEA..S pcm_s16le_planar     PCM signed 16-bit little-endian planar
  
   DEA..S pcm_s24be            PCM signed 24-bit big-endian
  
   DEA..S pcm_s24daud          PCM D-Cinema audio signed 24-bit
  
   DEA..S pcm_s24le            PCM signed 24-bit little-endian
  
   DEA..S pcm_s24le_planar     PCM signed 24-bit little-endian planar
  
   DEA..S pcm_s32be            PCM signed 32-bit big-endian
  
   DEA..S pcm_s32le            PCM signed 32-bit little-endian
  
   DEA..S pcm_s32le_planar     PCM signed 32-bit little-endian planar
  
   DEA..S pcm_s8               PCM signed 8-bit
  
   DEA..S pcm_s8_planar        PCM signed 8-bit planar
  
   DEA..S pcm_u16be            PCM unsigned 16-bit big-endian
  
   DEA..S pcm_u16le            PCM unsigned 16-bit little-endian
  
   DEA..S pcm_u24be            PCM unsigned 24-bit big-endian
  
   DEA..S pcm_u24le            PCM unsigned 24-bit little-endian
  
   DEA..S pcm_u32be            PCM unsigned 32-bit big-endian
  
   DEA..S pcm_u32le            PCM unsigned 32-bit little-endian
  
   DEA..S pcm_u8               PCM unsigned 8-bit
  
   D.A.L. pcm_zork             PCM Zork
  
   D.A.L. qcelp                QCELP / PureVoice
  
   D.A.L. qdm2                 QDesign Music Codec 2
  
   ..A.L. qdmc                 QDesign Music
  
   DEA.L. ra_144               RealAudio 1.0 (14.4K) (decoders: real_144 ) (encoders: real_144 )
  
   D.A.L. ra_288               RealAudio 2.0 (28.8K) (decoders: real_288 )
  
   D.A..S ralf                 RealAudio Lossless
  
   DEA.L. roq_dpcm             DPCM id RoQ
  
   DEA..S s302m                SMPTE 302M
  
   D.A..S shorten              Shorten
  
   D.A.L. sipr                 RealAudio SIPR / ACELP.NET
  
   D.A.L. smackaudio           Smacker audio (decoders: smackaud )
  
   ..A.L. smv                  SMV (Selectable Mode Vocoder)
  
   D.A.L. sol_dpcm             DPCM Sol
  
   DEA... sonic                Sonic
  
   .EA... sonicls              Sonic lossless
  
   ..A.L. speex                Speex
  
   D.A..S tak                  TAK (Tom's lossless Audio Kompressor)
  
   D.A..S truehd               TrueHD
  
   D.A.L. truespeech           DSP Group TrueSpeech
  
   DEA..S tta                  TTA (True Audio)
  
   D.A.L. twinvq               VQF TwinVQ
  
   D.A.L. vima                 LucasArts VIMA audio
  
   D.A.L. vmdaudio             Sierra VMD audio
  
   DEA.L. vorbis               Vorbis (decoders: vorbis libvorbis ) (encoders: vorbis libvorbis )
  
   ..A.L. voxware              Voxware RT29 Metasound
  
   D.A... wavesynth            Wave synthesis pseudo-codec
  
   DEA.LS wavpack              WavPack
  
   D.A.L. westwood_snd1        Westwood Audio (SND1) (decoders: ws_snd1 )
  
   D.A..S wmalossless          Windows Media Audio Lossless
  
   D.A.L. wmapro               Windows Media Audio 9 Professional
  
   DEA.L. wmav1                Windows Media Audio 1
  
   DEA.L. wmav2                Windows Media Audio 2
  
   D.A.L. wmavoice             Windows Media Audio Voice
  
   D.A.L. xan_dpcm             DPCM Xan
  
   ..D... dvd_nav_packet       DVD Nav packet
  
   ..D... klv                  SMPTE 336M Key-Length-Value (KLV) metadata
  
   DES... ass                  ASS (Advanced SSA) subtitle
  
   DES... dvb_subtitle         DVB subtitles (decoders: dvbsub ) (encoders: dvbsub )
  
   ..S... dvb_teletext         DVB teletext
  
   DES... dvd_subtitle         DVD subtitles (decoders: dvdsub ) (encoders: dvdsub )
  
   ..S... eia_608              EIA-608 closed captions
  
   D.S... hdmv_pgs_subtitle    HDMV Presentation Graphic Stream subtitles (decoders: pgssub )
  
   D.S... jacosub              JACOsub subtitle
  
   D.S... microdvd             MicroDVD subtitle
  
   DES... mov_text             MOV text
  
   D.S... mpl2                 MPL2 subtitle
  
   D.S... pjs                  PJS (Phoenix Japanimation Society) subtitle
  
   D.S... realtext             RealText subtitle
  
   D.S... sami                 SAMI subtitle
  
   DES... srt                  SubRip subtitle with embedded timing
  
   DES... ssa                  SSA (SubStation Alpha) subtitle
  
   DES... subrip               SubRip subtitle
  
   D.S... subviewer            SubViewer subtitle
  
   D.S... subviewer1           SubViewer v1 subtitle
  
   D.S... text                 raw UTF-8 text
  
   D.S... vplayer              VPlayer subtitle
  
   D.S... webvtt               WebVTT subtitle
  
   DES... xsub                 XSUB

• Revision 30966 : eviter le moche ’doctype_ecrire’ lors de l’upgrade

  17 août 2009, par fil@… — Log

  eviter le moche ’doctype_ecrire’ lors de l’upgrade