Update ffmpeg piping with udp and rtp

Also updated the tutorial for live and added ffmpeg_piping to toc.

Change-Id: I5596723cbd709e742ceab0f0789801f58606b932

docs/source/library.rst

@@ -2,8 +2,8 @@ Shaka Packager Library
 ======================
 
 Documentation for the top level Shaka packager library. See
-`Internal API <http://google.github.io/shaka-packager/docs/annotated.html>`_ for
-documentation on internal APIs.
+`Internal API <https://google.github.io/shaka-packager/docs/annotated.html>`_
+for documentation on internal APIs.
 
 .. doxygenclass:: shaka::Packager
 

docs/source/tutorials/ffmpeg_piping.rst

@@ -1,34 +1,57 @@
-ffmpeg piping
+FFmpeg piping
 =============
 
-We can use *ffmpeg* to redirect / pipe input not supported by *packager*
-to *packager*, for example, input from webcam devices. The example below uses
-webcam input device. The concept depicted here can be applied to
-other *ffmpeg* supported capture device.
+We can use *FFmpeg* to redirect / pipe input not supported by *packager*
+to *packager*, for example, input from webcam devices, or rtp input. The concept
+depicted here can be applied to other *FFmpeg* supported device or protocols.
 
-ffmpeg camera capture
----------------------
+Piping data to packager
+-----------------------
 
-Refer to `ffmpeg Capture/Webcam <https://trac.ffmpeg.org/wiki/Capture/Webcam>`_
-on how to use *ffmpeg* to capture webmcam inputs.
+There are two options to pipe data to packager.
 
-The examples below assumes Mac OS X 10.7 (Lion) or later. It is similar on
-other platforms. Refer to the above link for details.
+- UDP socket
 
-Create pipe
------------
+    *FFmpeg* supports writing to a UDP socket and *packager* supports reading
+    from UDP sockets::
 
-We use pipe to connect *ffmpeg* and *packager*::
+        $ packager 'input=udp://127.0.0.1:40000,...' ...
+        $ ffmpeg ... -f mpegts udp://127.0.0.1:40000
+
+    VP9 cannot be carried in mpegts. Another container, e.g. webm needs to be
+    used when outputs VP9. In this case, transcoding has to be started after
+    starting packager as the initialization segment is only transmitted in the
+    beginning of WebM output.
+
+- pipe
+
+    Similarily, pipe is also supported in both *FFmpeg* and *packager*::
 
     $ mkfifo pipe1
+    $ packager 'input=pipe1,...' ... --io_block_size 65536
+    $ ffmpeg ... -f mpegts pipe: > pipe1
+
+.. note::
+
+    Option -io_block_size 65536 tells packager to use an io_block_size of 65K
+    for threaded io file. This is necessary when using pipe as reading from pipe
+    blocks until the specified number of bytes, which is specified in
+    io_block_size for threaded io file, thus the value of io_block_size cannot
+    be too large.
 
 Encoding / capture command
 --------------------------
 
-The below command captures from the default audio / video devices on the
-machine::
+Camera capture
+^^^^^^^^^^^^^^
 
-    $ ffmpeg -f avfoundation -i "default" -f mpegts pipe: > pipe1
+Refer to `FFmpeg Capture/Webcam <https://trac.ffmpeg.org/wiki/Capture/Webcam>`_
+on how to use *FFmpeg* to capture webmcam inputs.
+
+The example assumes Mac OS X 10.7 (Lion) or later. It captures from the default
+audio / video devices on the machine::
+
+    $ ffmpeg -f avfoundation -i "default" -f mpegts udp://127.0.0.1:40000
 
 The command starts only after packager starts.
 
@@ -37,20 +60,35 @@ The command starts only after packager starts.
     After encoding starts, monitor encoding speed carefully. It should always be
     1x and above. If not, adjust the encoding parameters to recude it.
 
-Packaging command (DASH)
-------------------------
+RTP input
+^^^^^^^^^
+
+Assume there is an RTP input described by `saved_sdp_file`::
+
+    $ ffmpeg -protocol_whitelist "file,rtp,udp" -i saved_sdp_file -vcodec h264 \
+      -tune zerolatency -f mpegts udp://127.0.0.1:40000
+
+.. note::
+
+    For testing, you can generate an RTP input from a static media file::
+
+        $ ffmpeg -re -stream_loop 100 -i <static.mp4> -vcodec copy -an \
+          -f rtp rtp://239.255.0.1:1234 -sdp_file saved_sdp_file
+
+The command starts only after packager starts.
+
+.. note::
+
+    After encoding starts, monitor encoding speed carefully. It should always be
+    1x and above. If not, adjust the encoding parameters to recude it.
+
+Example packaging command in DASH
+---------------------------------
 
 ::
 
     $ packager \
-      'in=pipe1,stream=audio,init_segment=live_cam_audio.mp4,segment_template=live_cam_audio_$Number$.m4s' \
-      'in=pipe1,stream=video,init_segment=live_cam_video.mp4,segment_template=live_cam_video_$Number$.m4s' \
-      --mpd_output live_cam.mpd \
-      --io_block_size 65536
+      'in=udp://127.0.0.1:40000,stream=audio,init_segment=live_cam_audio.mp4,segment_template=live_cam_audio_$Number$.m4s' \
+      'in=udp://127.0.0.1:40000,stream=video,init_segment=live_cam_video.mp4,segment_template=live_cam_video_$Number$.m4s' \
+      --mpd_output live_cam.mpd
 
-.. note::
-
-    Option -io_block_size 65536 tells packager to use an io_block_size of 65K
-    for threaded io file. This is necessary as reading from pipe blocks until
-    the specified number of bytes, which is specified in io_block_size for
-    threaded io file, thus the value of io_block_size cannot be too large.

docs/source/tutorials/live.rst

@@ -4,11 +4,6 @@ Live
 A typical live source is UDP multicast, which is the only live protocol
 packager supports directly right now.
 
-.. include:: /options/udp_file_options.rst
-
-Pipe through FFmpeg
--------------------
-
 For other unsupported protocols, you can use FFmpeg to pipe the input.
 See :doc:`ffmpeg_piping` for details.
 
@@ -44,3 +39,7 @@ Here are some examples.
 
     Packager does not support removing old segments internally. The user is
     resposible for setting up a cron job to do so.
+
+.. include:: /options/udp_file_options.rst
+
+.. include:: /options/segment_template_formatting.rst

docs/source/tutorials/tutorials.rst

@@ -9,3 +9,4 @@ Tutorials
    hls.md
    live.md
    drm.rst
+   ffmpeg_piping.rst