feat: order streams in manifest based on command-line order (#1329)

This will force the muxer to order streams in the order given on the command-line. Closes #560 Closes #1280 Closes #1313 --------- Co-authored-by: Joey Parrish <[email protected]> Co-authored-by: Cosmin Stejerean <[email protected]>
shaka-project · Feb 14, 2024 · aad2a12 · aad2a12
1 parent df04d0e
commit aad2a12
Show file tree

Hide file tree

Showing 94 changed files with 980 additions and 584 deletions.
diff --git a/docs/source/options/dash_options.rst b/docs/source/options/dash_options.rst
@@ -99,4 +99,9 @@ DASH options
 --low_latency_dash_mode
 
     If enabled, LL-DASH streaming will be used,
-    reducing overall latency by decoupling latency from segment duration.
+    reducing overall latency by decoupling latency from segment duration.
+
+--force_cl_index
+
+    True forces the muxer to order streams in the order given 
+    on the command-line. False uses the previous unordered behavior.
diff --git a/docs/source/options/hls_options.rst b/docs/source/options/hls_options.rst
@@ -80,3 +80,8 @@ HLS options
 
     Optional. Defaults to 0 if not specified. If it is set to 1, indicates the
     stream is HLS only.
+
+--force_cl_index
+
+    True forces the muxer to order streams in the order given 
+    on the command-line. False uses the previous unordered behavior.
diff --git a/include/packager/packager.h b/include/packager/packager.h
@@ -9,6 +9,7 @@
 
 #include <cstdint>
 #include <memory>
+#include <optional>
 #include <string>
 #include <vector>
 
@@ -62,6 +63,7 @@ struct PackagingParams {
   /// Only use a single thread to generate output.  This is useful in tests to
   /// avoid non-deterministic outputs.
   bool single_threaded = false;
+
   /// DASH MPD related parameters.
   MpdParams mpd_params;
   /// HLS related parameters.
@@ -80,6 +82,9 @@ struct PackagingParams {
 
 /// Defines a single input/output stream.
 struct StreamDescriptor {
+  /// index of the stream to enforce ordering
+  std::optional<uint32_t> index;
+
   /// Input/source media file path or network stream URL. Required.
   std::string input;
 

diff --git a/packager/app/manifest_flags.cc b/packager/app/manifest_flags.cc
@@ -37,3 +37,8 @@ ABSL_FLAG(std::string,
           "",
           "Same as above, but this applies to text tracks only, and "
           "overrides the default language for text tracks.");
+ABSL_FLAG(bool,
+          force_cl_index,
+          true,
+          "True forces the muxer to order streams in the order given "
+          "on the command-line. False uses the previous unordered behavior.");
diff --git a/packager/app/manifest_flags.h b/packager/app/manifest_flags.h
@@ -16,5 +16,6 @@ ABSL_DECLARE_FLAG(double, time_shift_buffer_depth);
 ABSL_DECLARE_FLAG(uint64_t, preserved_segments_outside_live_window);
 ABSL_DECLARE_FLAG(std::string, default_language);
 ABSL_DECLARE_FLAG(std::string, default_text_language);
+ABSL_DECLARE_FLAG(bool, force_cl_index);
 
 #endif  // PACKAGER_APP_MANIFEST_FLAGS_H_
diff --git a/packager/app/packager_main.cc b/packager/app/packager_main.cc
@@ -583,6 +583,14 @@ int PackagerMain(int argc, char** argv) {
       return kArgumentValidationFailed;
     stream_descriptors.push_back(stream_descriptor.value());
   }
+
+  if (absl::GetFlag(FLAGS_force_cl_index)) {
+    int index = 0;
+    for (auto& descriptor : stream_descriptors) {
+      descriptor.index = index++;
+    }
+  }
+
   Packager packager;
   Status status =
       packager.Initialize(packaging_params.value(), stream_descriptors);

diff --git a/packager/app/test/packager_test.py b/packager/app/test/packager_test.py
@@ -474,7 +474,9 @@ def _GetFlags(self,
                 segment_duration=1.0,
                 use_fake_clock=True,
                 allow_codec_switching=False,
-                dash_force_segment_list=False):
+                dash_force_segment_list=False,
+                force_cl_index=False):
+
     flags = ['--single_threaded']
 
     if not strip_parameter_set_nalus:
@@ -558,6 +560,9 @@ def _GetFlags(self,
     if allow_codec_switching:
       flags += ['--allow_codec_switching']
 
+    if force_cl_index:
+      flags += ['--force_cl_index']
+
     if ad_cues:
       flags += ['--ad_cues', ad_cues]
 
@@ -1657,6 +1662,49 @@ def testAllowCodecSwitchingWithEncryptionAndTrickplay(self):
     self._CheckTestResults(
         'audio-video-with-codec-switching-encryption-trick-play')
 
+  def testForcedCommandlineOrdering(self):
+    streams = [
+        self._GetStream('text',  test_file='bear-english.vtt'),
+        self._GetStream('audio', test_file='bear-640x360.mp4'),
+        self._GetStream('video', test_file='bear-640x360-hevc.mp4'),
+        self._GetStream('video', test_file='bear-1280x720.mp4'),
+        self._GetStream('video', test_file='bear-640x360.mp4'),
+    ]
+
+    self.assertPackageSuccess(streams,
+                              self._GetFlags(output_dash=True, output_hls=True,
+                                             force_cl_index=True))
+    self._CheckTestResults('forced-commandline-ordering')
+
+  def testAllowCodecSwitchingWithCommandlineOrdering(self):
+    streams = [
+        self._GetStream('audio', test_file='bear-640x360.mp4'),
+        self._GetStream('video', test_file='bear-640x360-hevc.mp4'),
+        self._GetStream('video', test_file='bear-640x360.mp4'),
+        self._GetStream('video', test_file='bear-1280x720.mp4'),
+    ]
+
+    self.assertPackageSuccess(streams,
+                              self._GetFlags(output_dash=True,
+                                             allow_codec_switching=True,
+                                             force_cl_index=True))
+    self._CheckTestResults(
+      'audio-video-with-codec-switching-and-forced-commandline_order')
+
+  def testAudioVideoWithTrickPlayAndCommandlineOrdering(self):
+    streams = [
+        self._GetStream('audio', test_file='bear-640x360.mp4'),
+        self._GetStream('video', test_file='bear-640x360-hevc.mp4'),
+        self._GetStream('video', test_file='bear-640x360.mp4'),
+        self._GetStream('video', test_file='bear-1280x720.mp4',
+                        trick_play_factor=1),
+    ]
+
+    self.assertPackageSuccess(streams, self._GetFlags(output_dash=True,
+                                                      force_cl_index=True))
+    self._CheckTestResults(
+      'audio-video-with-trick-play-and-forced-commandline-order')
+
   def testLiveProfileAndEncryption(self):
     self.assertPackageSuccess(
         self._GetStreams(['audio', 'video'], segmented=True),

diff --git a/packager/app/test/testdata/audio-video-with-accessibilities-and-roles/output.mpd b/packager/app/test/testdata/audio-video-with-accessibilities-and-roles/output.mpd
@@ -2,25 +2,25 @@
 <!--Generated with https://github.com/shaka-project/shaka-packager version <tag>-<hash>-<test>-->
 <MPD xmlns="urn:mpeg:dash:schema:mpd:2011" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:mpeg:dash:schema:mpd:2011 DASH-MPD.xsd" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011" minBufferTime="PT2S" type="static" mediaPresentationDuration="PT2.736067S">
   <Period id="0">
-    <AdaptationSet id="0" contentType="video" width="640" height="360" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
-      <Representation id="0" bandwidth="973483" codecs="avc1.64001e" mimeType="video/mp4" sar="1:1">
-        <BaseURL>bear-640x360-video.mp4</BaseURL>
-        <SegmentBase indexRange="870-937" timescale="30000">
-          <Initialization range="0-869"/>
-        </SegmentBase>
-      </Representation>
-    </AdaptationSet>
-    <AdaptationSet id="1" contentType="audio" subsegmentAlignment="true">
+    <AdaptationSet id="0" contentType="audio" subsegmentAlignment="true">
       <Accessibility schemeIdUri="urn:tva:metadata:cs:AudioPurposeCS:2007" value="1"/>
       <Role schemeIdUri="urn:mpeg:dash:role:2011" value="description"/>
-      <Representation id="1" bandwidth="133334" codecs="mp4a.40.2" mimeType="audio/mp4" audioSamplingRate="44100">
+      <Representation id="0" bandwidth="133334" codecs="mp4a.40.2" mimeType="audio/mp4" audioSamplingRate="44100">
         <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
         <BaseURL>bear-640x360-audio.mp4</BaseURL>
         <SegmentBase indexRange="804-871" timescale="44100">
           <Initialization range="0-803"/>
         </SegmentBase>
       </Representation>
     </AdaptationSet>
+    <AdaptationSet id="1" contentType="video" width="640" height="360" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
+      <Representation id="1" bandwidth="973483" codecs="avc1.64001e" mimeType="video/mp4" sar="1:1">
+        <BaseURL>bear-640x360-video.mp4</BaseURL>
+        <SegmentBase indexRange="870-937" timescale="30000">
+          <Initialization range="0-869"/>
+        </SegmentBase>
+      </Representation>
+    </AdaptationSet>
     <AdaptationSet id="2" contentType="text" subsegmentAlignment="true">
       <Role schemeIdUri="urn:mpeg:dash:role:2011" value="caption"/>
       <Representation id="2" bandwidth="317" mimeType="text/vtt">

diff --git a/...ata/audio-video-with-codec-switching-and-forced-commandline_order/bear-1280x720-video.mp4 b/...ata/audio-video-with-codec-switching-and-forced-commandline_order/bear-1280x720-video.mp4
diff --git a/...data/audio-video-with-codec-switching-and-forced-commandline_order/bear-640x360-audio.mp4 b/...data/audio-video-with-codec-switching-and-forced-commandline_order/bear-640x360-audio.mp4
diff --git a/...audio-video-with-codec-switching-and-forced-commandline_order/bear-640x360-hevc-video.mp4 b/...audio-video-with-codec-switching-and-forced-commandline_order/bear-640x360-hevc-video.mp4
diff --git a/...data/audio-video-with-codec-switching-and-forced-commandline_order/bear-640x360-video.mp4 b/...data/audio-video-with-codec-switching-and-forced-commandline_order/bear-640x360-video.mp4
diff --git a/...pp/test/testdata/audio-video-with-codec-switching-and-forced-commandline_order/output.mpd b/...pp/test/testdata/audio-video-with-codec-switching-and-forced-commandline_order/output.mpd
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--Generated with https://github.com/shaka-project/shaka-packager version <tag>-<hash>-<test>-->
+<MPD xmlns="urn:mpeg:dash:schema:mpd:2011" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:mpeg:dash:schema:mpd:2011 DASH-MPD.xsd" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011" minBufferTime="PT2S" type="static" mediaPresentationDuration="PT2.8028S">
+  <Period id="0">
+    <AdaptationSet id="0" contentType="audio" subsegmentAlignment="true">
+      <Representation id="0" bandwidth="133334" codecs="mp4a.40.2" mimeType="audio/mp4" audioSamplingRate="44100">
+        <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
+        <BaseURL>bear-640x360-audio.mp4</BaseURL>
+        <SegmentBase indexRange="804-871" timescale="44100">
+          <Initialization range="0-803"/>
+        </SegmentBase>
+      </Representation>
+    </AdaptationSet>
+    <AdaptationSet id="1" contentType="video" width="640" height="360" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
+      <SupplementalProperty schemeIdUri="urn:mpeg:dash:adaptation-set-switching:2016" value="2"/>
+      <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main"/>
+      <Representation id="1" bandwidth="277411" codecs="hev1.1.6.L63.90" mimeType="video/mp4" sar="1:1">
+        <BaseURL>bear-640x360-hevc-video.mp4</BaseURL>
+        <SegmentBase indexRange="1910-1977" timescale="30000">
+          <Initialization range="0-1909"/>
+        </SegmentBase>
+      </Representation>
+    </AdaptationSet>
+    <AdaptationSet id="2" contentType="video" maxWidth="1280" maxHeight="720" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
+      <SupplementalProperty schemeIdUri="urn:mpeg:dash:adaptation-set-switching:2016" value="1"/>
+      <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main"/>
+      <Representation id="2" bandwidth="973483" codecs="avc1.64001e" mimeType="video/mp4" sar="1:1" width="640" height="360">
+        <BaseURL>bear-640x360-video.mp4</BaseURL>
+        <SegmentBase indexRange="870-937" timescale="30000">
+          <Initialization range="0-869"/>
+        </SegmentBase>
+      </Representation>
+      <Representation id="3" bandwidth="2627285" codecs="avc1.64001f" mimeType="video/mp4" sar="1:1" width="1280" height="720">
+        <BaseURL>bear-1280x720-video.mp4</BaseURL>
+        <SegmentBase indexRange="869-936" timescale="30000">
+          <Initialization range="0-868"/>
+        </SegmentBase>
+      </Representation>
+    </AdaptationSet>
+  </Period>
+</MPD>
diff --git a/packager/app/test/testdata/audio-video-with-codec-switching-encryption-trick-play/output.mpd b/packager/app/test/testdata/audio-video-with-codec-switching-encryption-trick-play/output.mpd
@@ -2,50 +2,50 @@
 <!--Generated with https://github.com/shaka-project/shaka-packager version <tag>-<hash>-<test>-->
 <MPD xmlns="urn:mpeg:dash:schema:mpd:2011" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:mpeg:dash:schema:mpd:2011 DASH-MPD.xsd" xmlns:cenc="urn:mpeg:cenc:2013" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011" minBufferTime="PT2S" type="static" mediaPresentationDuration="PT2.8028S">
   <Period id="0">
-    <AdaptationSet id="0" contentType="video" maxWidth="1280" maxHeight="720" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
+    <AdaptationSet id="0" contentType="video" width="640" height="360" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
       <ContentProtection value="cenc" schemeIdUri="urn:mpeg:dash:mp4protection:2011" cenc:default_KID="31323334-3536-3738-3930-313233343536"/>
       <ContentProtection schemeIdUri="urn:uuid:1077efec-c0b2-4d02-ace3-3c1e52e2fb4b">
         <cenc:pssh>AAAANHBzc2gBAAAAEHfv7MCyTQKs4zweUuL7SwAAAAExMjM0NTY3ODkwMTIzNDU2AAAAAA==</cenc:pssh>
       </ContentProtection>
-      <SupplementalProperty schemeIdUri="urn:mpeg:dash:adaptation-set-switching:2016" value="2"/>
+      <SupplementalProperty schemeIdUri="urn:mpeg:dash:adaptation-set-switching:2016" value="1"/>
       <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main"/>
-      <Representation id="0" bandwidth="2631545" codecs="avc1.64001f" mimeType="video/mp4" sar="1:1" width="1280" height="720">
-        <BaseURL>bear-1280x720-video.mp4</BaseURL>
-        <SegmentBase indexRange="1136-1203" timescale="30000">
-          <Initialization range="0-1135"/>
-        </SegmentBase>
-      </Representation>
-      <Representation id="3" bandwidth="977743" codecs="avc1.64001e" mimeType="video/mp4" sar="1:1" width="640" height="360">
-        <BaseURL>bear-640x360-video.mp4</BaseURL>
-        <SegmentBase indexRange="1138-1205" timescale="30000">
-          <Initialization range="0-1137"/>
+      <Representation id="0" bandwidth="281671" codecs="hev1.1.6.L63.90" mimeType="video/mp4" sar="1:1">
+        <BaseURL>bear-640x360-hevc-video.mp4</BaseURL>
+        <SegmentBase indexRange="3222-3289" timescale="30000">
+          <Initialization range="0-3221"/>
         </SegmentBase>
       </Representation>
     </AdaptationSet>
-    <AdaptationSet id="1" contentType="video" width="1280" height="720" frameRate="30000/30030" subsegmentAlignment="true" par="16:9">
+    <AdaptationSet id="1" contentType="video" maxWidth="1280" maxHeight="720" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
       <ContentProtection value="cenc" schemeIdUri="urn:mpeg:dash:mp4protection:2011" cenc:default_KID="31323334-3536-3738-3930-313233343536"/>
       <ContentProtection schemeIdUri="urn:uuid:1077efec-c0b2-4d02-ace3-3c1e52e2fb4b">
         <cenc:pssh>AAAANHBzc2gBAAAAEHfv7MCyTQKs4zweUuL7SwAAAAExMjM0NTY3ODkwMTIzNDU2AAAAAA==</cenc:pssh>
       </ContentProtection>
-      <EssentialProperty schemeIdUri="http://dashif.org/guidelines/trickmode" value="0"/>
-      <Representation id="1" bandwidth="470530" codecs="avc1.64001f" mimeType="video/mp4" sar="1:1" maxPlayoutRate="30" codingDependency="false">
-        <BaseURL>bear-1280x720-video-trick_play_factor_1.mp4</BaseURL>
+      <SupplementalProperty schemeIdUri="urn:mpeg:dash:adaptation-set-switching:2016" value="0"/>
+      <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main"/>
+      <Representation id="1" bandwidth="977743" codecs="avc1.64001e" mimeType="video/mp4" sar="1:1" width="640" height="360">
+        <BaseURL>bear-640x360-video.mp4</BaseURL>
+        <SegmentBase indexRange="1138-1205" timescale="30000">
+          <Initialization range="0-1137"/>
+        </SegmentBase>
+      </Representation>
+      <Representation id="2" bandwidth="2631545" codecs="avc1.64001f" mimeType="video/mp4" sar="1:1" width="1280" height="720">
+        <BaseURL>bear-1280x720-video.mp4</BaseURL>
         <SegmentBase indexRange="1136-1203" timescale="30000">
           <Initialization range="0-1135"/>
         </SegmentBase>
       </Representation>
     </AdaptationSet>
-    <AdaptationSet id="2" contentType="video" width="640" height="360" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
+    <AdaptationSet id="2" contentType="video" width="1280" height="720" frameRate="30000/30030" subsegmentAlignment="true" par="16:9">
       <ContentProtection value="cenc" schemeIdUri="urn:mpeg:dash:mp4protection:2011" cenc:default_KID="31323334-3536-3738-3930-313233343536"/>
       <ContentProtection schemeIdUri="urn:uuid:1077efec-c0b2-4d02-ace3-3c1e52e2fb4b">
         <cenc:pssh>AAAANHBzc2gBAAAAEHfv7MCyTQKs4zweUuL7SwAAAAExMjM0NTY3ODkwMTIzNDU2AAAAAA==</cenc:pssh>
       </ContentProtection>
-      <SupplementalProperty schemeIdUri="urn:mpeg:dash:adaptation-set-switching:2016" value="0"/>
-      <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main"/>
-      <Representation id="2" bandwidth="281671" codecs="hev1.1.6.L63.90" mimeType="video/mp4" sar="1:1">
-        <BaseURL>bear-640x360-hevc-video.mp4</BaseURL>
-        <SegmentBase indexRange="3222-3289" timescale="30000">
-          <Initialization range="0-3221"/>
+      <EssentialProperty schemeIdUri="http://dashif.org/guidelines/trickmode" value="1"/>
+      <Representation id="3" bandwidth="470530" codecs="avc1.64001f" mimeType="video/mp4" sar="1:1" maxPlayoutRate="30" codingDependency="false">
+        <BaseURL>bear-1280x720-video-trick_play_factor_1.mp4</BaseURL>
+        <SegmentBase indexRange="1136-1203" timescale="30000">
+          <Initialization range="0-1135"/>
         </SegmentBase>
       </Representation>
     </AdaptationSet>

diff --git a/packager/app/test/testdata/audio-video-with-codec-switching/output.mpd b/packager/app/test/testdata/audio-video-with-codec-switching/output.mpd
@@ -2,29 +2,29 @@
 <!--Generated with https://github.com/shaka-project/shaka-packager version <tag>-<hash>-<test>-->
 <MPD xmlns="urn:mpeg:dash:schema:mpd:2011" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:mpeg:dash:schema:mpd:2011 DASH-MPD.xsd" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011" minBufferTime="PT2S" type="static" mediaPresentationDuration="PT2.8028S">
   <Period id="0">
-    <AdaptationSet id="0" contentType="video" maxWidth="1280" maxHeight="720" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
+    <AdaptationSet id="0" contentType="video" width="640" height="360" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
       <SupplementalProperty schemeIdUri="urn:mpeg:dash:adaptation-set-switching:2016" value="1"/>
       <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main"/>
-      <Representation id="0" bandwidth="2627285" codecs="avc1.64001f" mimeType="video/mp4" sar="1:1" width="1280" height="720">
-        <BaseURL>bear-1280x720-video.mp4</BaseURL>
-        <SegmentBase indexRange="869-936" timescale="30000">
-          <Initialization range="0-868"/>
+      <Representation id="0" bandwidth="277411" codecs="hev1.1.6.L63.90" mimeType="video/mp4" sar="1:1">
+        <BaseURL>bear-640x360-hevc-video.mp4</BaseURL>
+        <SegmentBase indexRange="1910-1977" timescale="30000">
+          <Initialization range="0-1909"/>
         </SegmentBase>
       </Representation>
-      <Representation id="2" bandwidth="973483" codecs="avc1.64001e" mimeType="video/mp4" sar="1:1" width="640" height="360">
+    </AdaptationSet>
+    <AdaptationSet id="1" contentType="video" maxWidth="1280" maxHeight="720" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
+      <SupplementalProperty schemeIdUri="urn:mpeg:dash:adaptation-set-switching:2016" value="0"/>
+      <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main"/>
+      <Representation id="1" bandwidth="973483" codecs="avc1.64001e" mimeType="video/mp4" sar="1:1" width="640" height="360">
         <BaseURL>bear-640x360-video.mp4</BaseURL>
         <SegmentBase indexRange="870-937" timescale="30000">
           <Initialization range="0-869"/>
         </SegmentBase>
       </Representation>
-    </AdaptationSet>
-    <AdaptationSet id="1" contentType="video" width="640" height="360" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
-      <SupplementalProperty schemeIdUri="urn:mpeg:dash:adaptation-set-switching:2016" value="0"/>
-      <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main"/>
-      <Representation id="1" bandwidth="277411" codecs="hev1.1.6.L63.90" mimeType="video/mp4" sar="1:1">
-        <BaseURL>bear-640x360-hevc-video.mp4</BaseURL>
-        <SegmentBase indexRange="1910-1977" timescale="30000">
-          <Initialization range="0-1909"/>
+      <Representation id="2" bandwidth="2627285" codecs="avc1.64001f" mimeType="video/mp4" sar="1:1" width="1280" height="720">
+        <BaseURL>bear-1280x720-video.mp4</BaseURL>
+        <SegmentBase indexRange="869-936" timescale="30000">
+          <Initialization range="0-868"/>
         </SegmentBase>
       </Representation>
     </AdaptationSet>