write_child_node need to help str node_type

[athensofamerica]

The write_child_node defined in utils.py needs handle special case for str node type.

def write_child_node(xmlnode, tag_name, node):
if node:
xmldoc = xmlnode if isinstance(xmlnode, minidom.Document) else xmlnode.ownerDocument
if isinstance(node, list):
for n in node:
new_elem = xmldoc.createElement(tag_name)
#n.write(new_elem) #This doesn't work for str type. exception throws. Add the following 4 lines of code seems to solved the problem.
if isinstance(n, str) or isinstance(n, unicode):
write_node_value(new_elem, n)
else:
n.write(new_elem)
xmlnode.appendChild(new_elem)
else:
new_elem = xmldoc.createElement(tag_name)
node.write(new_elem)
xmlnode.appendChild(new_elem)

[sangwonl]

@athensofamerica Thanks also. Regarding the issue, it could be a corner case. Can you help me reproduce the problem? Any test code you've faced the issue would be helpful.

[mpegdash-user]

Here is an example .mpd file (multi_subs.mpd) from the git-hub Dash Industry Forum .

I believe the issue here is that the file is marked as utf-8 encoded. @athensofamerica provided a fine set of patches that enable the library to work on utf-8 encoded .xml files.

<?xml version="1.0" encoding="utf-8"?>
<MPD xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:mpeg:dash:schema:mpd:2011" xsi:schemaLocation="urn:mpeg:dash:schema:mpd:2011 DASH-MPD.xsd" profiles="urn:mpeg:dash:profile:isoff-live:2011,urn:com:dashif:dash264" maxSegmentDuration="PT2S" minBufferTime="PT2S" type="static" mediaPresentationDuration="PT1H">
   <ProgramInformation>
      <Title>Media Presentation Description by MobiTV. Powered by MDL Team@Sweden.</Title>
   </ProgramInformation>
   <Period id="precambrian" start="PT0S">
      <AdaptationSet contentType="audio" mimeType="audio/mp4" lang="eng" segmentAlignment="true" startWithSAP="1">
         <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main"/>
         <SegmentTemplate startNumber="1" initialization="$RepresentationID$/init.mp4" duration="2" media="$RepresentationID$/$Number$.m4s"/>
         <Representation id="A48" codecs="mp4a.40.2" bandwidth="48000" audioSamplingRate="48000">
            <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
         </Representation>
      </AdaptationSet>
      <AdaptationSet contentType="video" mimeType="video/mp4" segmentAlignment="true" startWithSAP="1" par="16:9" minWidth="640" maxWidth="640" minHeight="360" maxHeight="360" maxFrameRate="60/2">
         <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main"/>
         <SegmentTemplate startNumber="1" initialization="$RepresentationID$/init.mp4" duration="2" media="$RepresentationID$/$Number$.m4s"/>
         <Representation id="V300" codecs="avc1.64001e" bandwidth="300000" width="640" height="360" frameRate="30" sar="1:1"/>
      </AdaptationSet>
      <AdaptationSet contentType="text" mimeType="application/mp4" segmentAlignment="true" lang="eng">
         <Role schemeIdUri="urn:mpeg:dash:role:2011" value="subtitle"/>
         <SegmentTemplate startNumber="1" initialization="$RepresentationID$/init.mp4" duration="2" media="$RepresentationID$/$Number$.m4s"/>
         <Representation id="sub_eng" codecs="stpp" startWithSAP="1" bandwidth="5367"/>
      </AdaptationSet>
      <AdaptationSet contentType="text" mimeType="application/mp4" segmentAlignment="true" lang="eng">
         <Role schemeIdUri="urn:mpeg:dash:role:2011" value="caption"/>
         <SegmentTemplate startNumber="1" initialization="$RepresentationID$/init.mp4" duration="2" media="$RepresentationID$/$Number$.m4s"/>
         <Representation id="sub_eng_cap" codecs="stpp" startWithSAP="1" bandwidth="5367"/>
      </AdaptationSet>
      <AdaptationSet contentType="text" mimeType="application/mp4" segmentAlignment="true" lang="swe">
         <Role schemeIdUri="urn:mpeg:dash:role:2011" value="subtitle"/>
         <SegmentTemplate startNumber="1" initialization="$RepresentationID$/init.mp4" duration="2" media="$RepresentationID$/$Number$.m4s"/>
         <Representation id="sub_swe" codecs="stpp" startWithSAP="1" bandwidth="5367"/>
      </AdaptationSet>
      <AdaptationSet contentType="text" mimeType="application/mp4" segmentAlignment="true" lang="qbb">
         <Role schemeIdUri="urn:mpeg:dash:role:2011" value="subtitle"/>
         <SegmentTemplate startNumber="1" initialization="$RepresentationID$/init.mp4" duration="2" media="$RepresentationID$/$Number$.m4s"/>
         <Representation id="sub_ttml_qbb" codecs="stpp" startWithSAP="1" bandwidth="5367"/>
      </AdaptationSet>
      <AdaptationSet contentType="text" mimeType="application/mp4" segmentAlignment="true" lang="nor">
         <Role schemeIdUri="urn:mpeg:dash:role:2011" value="subtitle"/>
         <SegmentTemplate startNumber="1" initialization="$RepresentationID$/init.mp4" duration="2" media="$RepresentationID$/$Number$.m4s"/>
         <Representation id="sub_nor" codecs="stpp" startWithSAP="1" bandwidth="5367"/>
      </AdaptationSet>
   </Period>
</MPD>

[sangwonl]

@athensofamerica Hello, it was a long time. Today, I was trying to reproduce the issue again, but wasn't. The MPD sample from @mpegdash-user also works fine with parsing and saving. Can you give a valid MPD sample that causes #n.write(new_elem) #This doesn't work for str type. exception throws?