gstreamer/gst/isomp4/gstqtmux-doc.c

300 lines
16 KiB
C

/* Quicktime muxer documentation
* Copyright (C) 2008-2010 Thiago Santos <thiagoss@embedded.ufcg.edu.br>
* Copyright (C) 2008 Mark Nauwelaerts <mnauw@users.sf.net>
* Copyright (C) 2010 Nokia Corporation. All rights reserved.
* Contact: Stefan Kost <stefan.kost@nokia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Unless otherwise indicated, Source Code is licensed under MIT license.
* See further explanation attached in License Statement (distributed in the file
* LICENSE).
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* ============================= mp4mux ==================================== */
/**
* SECTION:element-mp4mux
* @short_description: Muxer for ISO MPEG-4 (.mp4) files
*
* This element merges streams (audio and video) into ISO MPEG-4 (.mp4) files.
*
* The following background intends to explain why various similar muxers
* are present in this plugin.
*
* The <ulink url="http://www.apple.com/quicktime/resources/qtfileformat.pdf">
* QuickTime file format specification</ulink> served as basis for the MP4 file
* format specification (mp4mux), and as such the QuickTime file structure is
* nearly identical to the so-called ISO Base Media file format defined in
* ISO 14496-12 (except for some media specific parts).
* In turn, the latter ISO Base Media format was further specialized as a
* Motion JPEG-2000 file format in ISO 15444-3 (mj2mux)
* and in various 3GPP(2) specs (gppmux).
* The fragmented file features defined (only) in ISO Base Media are used by
* ISMV files making up (a.o.) Smooth Streaming (ismlmux).
*
* A few properties (<link linkend="GstMP4Mux--movie-timescale">movie-timescale</link>,
* <link linkend="GstMP4Mux--trak-timescale">trak-timescale</link>) allow adjusting
* some technical parameters, which might be useful in (rare) cases to resolve
* compatibility issues in some situations.
*
* Some other properties influence the result more fundamentally.
* A typical mov/mp4 file's metadata (aka moov) is located at the end of the file,
* somewhat contrary to this usually being called "the header".
* However, a <link linkend="GstMP4Mux--faststart">faststart</link> file will
* (with some effort) arrange this to be located near start of the file,
* which then allows it e.g. to be played while downloading.
* Alternatively, rather than having one chunk of metadata at start (or end),
* there can be some metadata at start and most of the other data can be spread
* out into fragments of <link linkend="GstMP4Mux--fragment-duration">fragment-duration</link>.
* If such fragmented layout is intended for streaming purposes, then
* <link linkend="GstMP4Mux--streamable">streamable</link> allows foregoing to add
* index metadata (at the end of file).
*
* <link linkend="GstMP4Mux--dts-method">dts-method</link> allows selecting a
* method for managing input timestamps (stay tuned for 0.11 to have this
* automagically settled). The default delta/duration method should handle nice
* (aka perfect streams) just fine, but may experience problems otherwise
* (e.g. input stream with re-ordered B-frames and/or with frame dropping).
* The re-ordering approach re-assigns incoming timestamps in ascending order
* to incoming buffers and offers an alternative in such cases. In cases where
* that might fail, the remaining method can be tried, which is exact and
* according to specs, but might experience playback on not so spec-wise players.
* Note that this latter approach also requires one to enable
* <link linkend="GstMP4Mux--presentation-timestamp">presentation-timestamp</link>.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch gst-launch v4l2src num-buffers=50 ! queue ! x264enc ! mp4mux ! filesink location=video.mp4
* ]|
* Records a video stream captured from a v4l2 device, encodes it into H.264
* and muxes it into an mp4 file.
* </refsect2>
*
* Documentation last reviewed on 2011-04-21
*/
/* ============================= 3gppmux ==================================== */
/**
* SECTION:element-3gppmux
* @short_description: Muxer for 3GPP (.3gp) files
*
* This element merges streams (audio and video) into 3GPP (.3gp) files.
*
* The following background intends to explain why various similar muxers
* are present in this plugin.
*
* The <ulink url="http://www.apple.com/quicktime/resources/qtfileformat.pdf">
* QuickTime file format specification</ulink> served as basis for the MP4 file
* format specification (mp4mux), and as such the QuickTime file structure is
* nearly identical to the so-called ISO Base Media file format defined in
* ISO 14496-12 (except for some media specific parts).
* In turn, the latter ISO Base Media format was further specialized as a
* Motion JPEG-2000 file format in ISO 15444-3 (mj2mux)
* and in various 3GPP(2) specs (gppmux).
* The fragmented file features defined (only) in ISO Base Media are used by
* ISMV files making up (a.o.) Smooth Streaming (ismlmux).
*
* A few properties (<link linkend="Gst3GPPMux--movie-timescale">movie-timescale</link>,
* <link linkend="Gst3GPPMux--trak-timescale">trak-timescale</link>) allow adjusting
* some technical parameters, which might be useful in (rare) cases to resolve
* compatibility issues in some situations.
*
* Some other properties influence the result more fundamentally.
* A typical mov/mp4 file's metadata (aka moov) is located at the end of the file,
* somewhat contrary to this usually being called "the header".
* However, a <link linkend="Gst3GPPMux--faststart">faststart</link> file will
* (with some effort) arrange this to be located near start of the file,
* which then allows it e.g. to be played while downloading.
* Alternatively, rather than having one chunk of metadata at start (or end),
* there can be some metadata at start and most of the other data can be spread
* out into fragments of <link linkend="Gst3GPPMux--fragment-duration">fragment-duration</link>.
* If such fragmented layout is intended for streaming purposes, then
* <link linkend="Gst3GPPMux--streamable">streamable</link> allows foregoing to add
* index metadata (at the end of file).
*
* <link linkend="Gst3GPPMux--dts-method">dts-method</link> allows selecting a
* method for managing input timestamps (stay tuned for 0.11 to have this
* automagically settled). The default delta/duration method should handle nice
* (aka perfect streams) just fine, but may experience problems otherwise
* (e.g. input stream with re-ordered B-frames and/or with frame dropping).
* The re-ordering approach re-assigns incoming timestamps in ascending order
* to incoming buffers and offers an alternative in such cases. In cases where
* that might fail, the remaining method can be tried, which is exact and
* according to specs, but might experience playback on not so spec-wise players.
* Note that this latter approach also requires one to enable
* <link linkend="Gst3GPPMux--presentation-timestamp">presentation-timestamp</link>.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch v4l2src num-buffers=50 ! queue ! ffenc_h263 ! gppmux ! filesink location=video.3gp
* ]|
* Records a video stream captured from a v4l2 device, encodes it into H.263
* and muxes it into an 3gp file.
* </refsect2>
*
* Documentation last reviewed on 2011-04-21
*/
/* ============================= mj2pmux ==================================== */
/**
* SECTION:element-mj2mux
* @short_description: Muxer for Motion JPEG-2000 (.mj2) files
*
* This element merges streams (audio and video) into MJ2 (.mj2) files.
*
* The following background intends to explain why various similar muxers
* are present in this plugin.
*
* The <ulink url="http://www.apple.com/quicktime/resources/qtfileformat.pdf">
* QuickTime file format specification</ulink> served as basis for the MP4 file
* format specification (mp4mux), and as such the QuickTime file structure is
* nearly identical to the so-called ISO Base Media file format defined in
* ISO 14496-12 (except for some media specific parts).
* In turn, the latter ISO Base Media format was further specialized as a
* Motion JPEG-2000 file format in ISO 15444-3 (mj2mux)
* and in various 3GPP(2) specs (gppmux).
* The fragmented file features defined (only) in ISO Base Media are used by
* ISMV files making up (a.o.) Smooth Streaming (ismlmux).
*
* A few properties (<link linkend="GstMJ2Mux--movie-timescale">movie-timescale</link>,
* <link linkend="GstMJ2Mux--trak-timescale">trak-timescale</link>) allow adjusting
* some technical parameters, which might be useful in (rare) cases to resolve
* compatibility issues in some situations.
*
* Some other properties influence the result more fundamentally.
* A typical mov/mp4 file's metadata (aka moov) is located at the end of the file,
* somewhat contrary to this usually being called "the header".
* However, a <link linkend="GstMJ2Mux--faststart">faststart</link> file will
* (with some effort) arrange this to be located near start of the file,
* which then allows it e.g. to be played while downloading.
* Alternatively, rather than having one chunk of metadata at start (or end),
* there can be some metadata at start and most of the other data can be spread
* out into fragments of <link linkend="GstMJ2Mux--fragment-duration">fragment-duration</link>.
* If such fragmented layout is intended for streaming purposes, then
* <link linkend="GstMJ2Mux--streamable">streamable</link> allows foregoing to add
* index metadata (at the end of file).
*
* <link linkend="GstMJ2Mux--dts-method">dts-method</link> allows selecting a
* method for managing input timestamps (stay tuned for 0.11 to have this
* automagically settled). The default delta/duration method should handle nice
* (aka perfect streams) just fine, but may experience problems otherwise
* (e.g. input stream with re-ordered B-frames and/or with frame dropping).
* The re-ordering approach re-assigns incoming timestamps in ascending order
* to incoming buffers and offers an alternative in such cases. In cases where
* that might fail, the remaining method can be tried, which is exact and
* according to specs, but might experience playback on not so spec-wise players.
* Note that this latter approach also requires one to enable
* <link linkend="GstMJ2Mux--presentation-timestamp">presentation-timestamp</link>.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch v4l2src num-buffers=50 ! queue ! jp2kenc ! mj2mux ! filesink location=video.mj2
* ]|
* Records a video stream captured from a v4l2 device, encodes it into JPEG-2000
* and muxes it into an mj2 file.
* </refsect2>
*
* Documentation last reviewed on 2011-04-21
*/
/* ============================= ismlmux ==================================== */
/**
* SECTION:element-ismlmux
* @short_description: Muxer for ISML smooth streaming (.isml) files
*
* This element merges streams (audio and video) into MJ2 (.mj2) files.
*
* The following background intends to explain why various similar muxers
* are present in this plugin.
*
* The <ulink url="http://www.apple.com/quicktime/resources/qtfileformat.pdf">
* QuickTime file format specification</ulink> served as basis for the MP4 file
* format specification (mp4mux), and as such the QuickTime file structure is
* nearly identical to the so-called ISO Base Media file format defined in
* ISO 14496-12 (except for some media specific parts).
* In turn, the latter ISO Base Media format was further specialized as a
* Motion JPEG-2000 file format in ISO 15444-3 (mj2mux)
* and in various 3GPP(2) specs (gppmux).
* The fragmented file features defined (only) in ISO Base Media are used by
* ISMV files making up (a.o.) Smooth Streaming (ismlmux).
*
* A few properties (<link linkend="GstISMLMux--movie-timescale">movie-timescale</link>,
* <link linkend="GstISMLMux--trak-timescale">trak-timescale</link>) allow adjusting
* some technical parameters, which might be useful in (rare) cases to resolve
* compatibility issues in some situations.
*
* Some other properties influence the result more fundamentally.
* A typical mov/mp4 file's metadata (aka moov) is located at the end of the file,
* somewhat contrary to this usually being called "the header".
* However, a <link linkend="GstISMLMux--faststart">faststart</link> file will
* (with some effort) arrange this to be located near start of the file,
* which then allows it e.g. to be played while downloading.
* Alternatively, rather than having one chunk of metadata at start (or end),
* there can be some metadata at start and most of the other data can be spread
* out into fragments of <link linkend="GstISMLMux--fragment-duration">fragment-duration</link>.
* If such fragmented layout is intended for streaming purposes, then
* <link linkend="GstISMLMux--streamable">streamable</link> allows foregoing to add
* index metadata (at the end of file).
*
* <link linkend="GstISMLMux--dts-method">dts-method</link> allows selecting a
* method for managing input timestamps (stay tuned for 0.11 to have this
* automagically settled). The default delta/duration method should handle nice
* (aka perfect streams) just fine, but may experience problems otherwise
* (e.g. input stream with re-ordered B-frames and/or with frame dropping).
* The re-ordering approach re-assigns incoming timestamps in ascending order
* to incoming buffers and offers an alternative in such cases. In cases where
* that might fail, the remaining method can be tried, which is exact and
* according to specs, but might experience playback on not so spec-wise players.
* Note that this latter approach also requires one to enable
* <link linkend="GstISMLMux--presentation-timestamp">presentation-timestamp</link>.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch v4l2src num-buffers=50 ! queue ! jp2kenc ! mj2mux ! filesink location=video.mj2
* ]|
* Records a video stream captured from a v4l2 device, encodes it into JPEG-2000
* and muxes it into an mj2 file.
* </refsect2>
*
* Documentation last reviewed on 2011-04-21
*/