Databases
StackOverflow2013
Postsdbo
POSend Android h264 capture over a rtp stream
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POSend Android h264 capture over a rtp stream
    primarykey
    data
    text
    <p>I'm writing a rtp video streamer for android that reads h264 coded data from an Android local socket and packetize it. The thing is that I did it but I keep getting black frames in the client side (Voip).</p> <p>The communication goes like this: Android -> Asterisk -> Jitsi (Osx) (and reverse)</p> <p>There are a few things that I haven't understood yet:</p> <p>1) Android's mediarecorder gives me a raw h264 stream, How can I know when a NAL starts / ends based on that stream? It doesn't have any 0x000001 pattern but it does have a 0x0000 (which I'm assuming is a separator) </p> <p><strong>EDIT:</strong></p> <p>Adding more information. These are 2 (<a href="http://dl.dropbox.com/u/671680/1.png" rel="nofollow">first</a>, <a href="http://dl.dropbox.com/u/671680/2.png" rel="nofollow">second</a>) different reads of the input buffer (in order). If I got it right the first 4 bytes should be used to get the NALU length and the 5th one (index 4) is the NALU header.</p> <p>I'll copy here the byte's values for future usage:</p> <pre><code>1) 0 0 12 114 101 -72 4 25 -15 -1 -121 -53 ..... length = (114&amp;0xFF) + (12&amp;0xFF)*256 + (0&amp;0xFF) length -&gt; 3186 forbidden = 101 &amp; 0x80 forbidden -&gt; 0 nri = 101 &amp; 0x60 nri -&gt; 96 nal_unit_type = 101 &amp; 0x1F nal_unit_type -&gt; 5 2) 0 0 1 -93 97 -32 32 103 -14 93 -1 .... length = (-93&amp;0xFF) + (1&amp;0xFF)*256 + (0&amp;0xFF) length -&gt; 419 forbidden = 97 &amp; 0x80 forbidden -&gt; 0 nri = 97 &amp; 0x60 nri -&gt; 96 nal_unit_type = 97 &amp; 0x1F nal_unit_type -&gt; 1 </code></pre> <p>is this correct? </p> <p>2) How can I get the NALu timestamp and its length from that stream? </p> <p>3) For some reason the packets are being marked (Even when I unset the marker). (In case you check the pcap file) [<strong>FIXED:</strong> I wasn't using the same SSCR for every packet]</p> <p>Here's a <a href="http://dl.dropbox.com/u/671680/android_last.pcap" rel="nofollow">pcap</a> capture of the stream coming from asterisk (wich comes from Android). The Android device is an Asus Transform Prime with Android ICS.</p> <p>I'm sending the packetization-mode (<code>1</code>) and profile-level-id (<code>42801e</code>) in the sdp, I've also tried sending the sprops (sps: <code>Z0KAHpWgUHxA</code>, psp: <code>aM48gA==</code>) parameter but nothing changed.</p> <p>Cheers.</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USFlaPer87
    1. USFlaPer87
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POSend Android h264 capture over a rtp stream
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload