<?xml version="1.0"?>
<query>
    <userid>[UserID]</userid> <!-- required -->
    <userkey>[UserKey]</userkey> <!-- required -->
    <action>AddMedia</action> <!-- required -->
    <source>[SourceFile1]</source> <!-- required -->
    <source>
        <url>[SourceFile2]</url>
        <url>[AdditionalSourceFile2]</url>
        <audio_stream>
            <use_stream_id>[SourceMediaAudioStreamID]</use_stream_id>
            <natural_order>[yes|no]</natural_order>
            <language>[Language]</language>
            <channel>
                <id>[OutputChannelID]</id>
                <in>
                    <id>[SourceTrackID:SourceChannelID]</id>
                    <gain>[ChannelGainLevel]</gain>
                </in>
                <in>
                    <!-- Input channel params -->
                </in>
            </channel>
            <channel>
                <!-- Audio channel params -->
            </channel>
            <normalize>[yes|no]</normalize>
            <layout>[AudioLayoutName]</layout>
            <start>[StartTimecode]</start>
            <finish>[FinishTimecode]</finish>
            <duration>[Duration]</duration>
        </audio_stream>
        <!-- Multiple audio streams -->
        <audio_stream>
            <!-- Audio stream params -->
        </audio_stream>
    </source>
    <source>
        <url>[SourceFile3]</url>
        <!-- Source params -->
    </source>
    <format> <!-- required -->
        <!-- Format params --> 
    </format>
</query>

{
    "query": {
        "userid": "[UserID]", // required
        "userkey": "[UserKey]", // required
        "action": "AddMedia",  // required
        "source": [ // required
            "[SourceFile1]", 
            {
                "url": [
                    "[SourceFile2]",
                    "[AdditionalSourceFile2]"
                ],
                "audio_stream": [
                    {
                        "use_stream_id": "[SourceMediaAudioStreamID]",
                        "natural_order": "[yes|no]",
                        "language": "[Language]",
                        "channel": [
                            {
                                "id": "[OutputChannelID]",
                                "in": [
                                    {
                                        "id": "[SourceTrackID:SourceChannelID]",
                                        "gain": "[ChannelGainLevel]"
                                    },
                                    {
                                        // Input channel params
                                    }
                                ]
                            },
                            {
                                // Audio channel params
                            }
                        ],
                        "normalize": "[yes|no]",
                        "layout": "[AudioLayoutName]",
                        "start": "[StartTimecode]",
                        "finish": "[FinishTimecode]",
                        "duration": "[Duration]"
                    }, 
                    {
                        //Audio stream params
                    }
                ]
            },
            {
                "url": "[SourceFile3]"
                // Source params
            }
        ],
        "format": { // required
            // Format params
        }
    }
}

Parameter	Description	Allowed Values	Default Values
use_stream_id	Specify the source media stream ID.	Set of 2 non-negative integer numbers separated by colon sign e.g. F:S Where F – File index (index of <url />* param in <source /> block)* S – Stream index in source file	none
language	Specify the track language.	A language code in 3 lowercase letters according to ISO639-2.	none
Mapping Parameters	-	-	-
normalize	Enable the renormalization output track to avoid clipping noise.	yes, no	none
layout	Specify the output channels layout.	One of these channel layouts: mono — FC stereo — FL+FR 2.1 — FL+FR+LFE 3.0 — FL+FR+FC 3.0-back — FL+FR+BC 4.0 — FL+FR+FC+BC quad — FL+FR+BL+BR quad-side — FL+FR+SL+SR 3.1 — FL+FR+FC+LFE 5.0 — FL+FR+FC+BL+BR 5.0-side — FL+FR+FC+SL+SR 4.1 — FL+FR+FC+LFE+BC 5.1 — FL+FR+FC+LFE+BL+BR 5.1-side — FL+FR+FC+LFE+SL+SR 6.0 — FL+FR+FC+BC+SL+SR 6.0-front — FL+FR+FLC+FRC+SL+SR hexagonal — FL+FR+FC+BL+BR+BC 6.1 — FL+FR+FC+LFE+BC+SL+SR 6.1 — FL+FR+FC+LFE+BL+BR+BC 6.1-front — FL+FR+LFE+FLC+FRC+SL+SR 7.0 — FL+FR+FC+BL+BR+SL+SR 7.0-front — FL+FR+FC+FLC+FRC+SL+SR 7.1 — FL+FR+FC+LFE+BL+BR+SL+SR 7.1-wide — FL+FR+FC+LFE+BL+BR+FLC+FRC 7.1-wide-side — FL+FR+FC+LFE+FLC+FRC+SL+SR octagonal — FL+FR+FC+BL+BR+BC+SL+SR downmix — DL+DR	none
Output Audio Channel Parameters	-	-	-
id	Specify the output channel ID.	Channel number or one of these channel names: FL — front left FR — front right FC — front center LFE — low frequency BL — back left BR — back right FLC — front left-of-center FRC — front right-of-center BC — back center SL — side left SR — side right TC — top center TFL — top front left TFC — top front center TFR — top front right TBL — top back left TBC — top back center TBR — top back right DL — downmix left DR — downmix right WL — wide left WR — wide right SDL — surround direct left SDR — surround direct right LFE2 — low frequency 2	none
Input Audio Channel Parameters	-	-	-
id	Specify input audio channel ID.	Set of 3 non-negative integer numbers separated by colon sign e.g. F:S:C Where F – File index (index of <url />* param in <source /> block)* S – Stream index in source file * C – Channel index in audio stream	none
gain	Sepcify the input audio channel gain level.	Float positive number from 0 to 1	none
natural_order	If set to yes then value of <use_stream_id /> will mean number of source's audio stream, not number of stream in all type streams list.	yes, no	no
Clipping Parameters	-	-	-
start	Specify where the video clip should start.	Non-negative float or timecode	none
finish	Specify where the video clip should end.	Non-negative float or timecode	none
duration	Specify the duration of the video clip.	Positive integer	none
Audio Stream Parameters	-	-	-
Source Parameters	-	-	-
url	Source File URL	Valid URL	none