rtmp: Send video on a separate channel.

Sending non-monotonic packets (e.g. when the audio and video
streams are monotonic within themselves but not muxed
monotonically) will lead to negative values the RTMP timestamp
field (where timestamps are transmitted only as deltas for each
channel), and this delta can end up being incorrectly written as
a large unsigned number.
Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/rtmpproto.c

@@ -2637,6 +2637,7 @@ static int rtmp_write(URLContext *s, const uint8_t *buf, int size)
         if (rt->flv_header_bytes < 11) {
             const uint8_t *header = rt->flv_header;
             int copy = FFMIN(11 - rt->flv_header_bytes, size_temp);
+            int channel = RTMP_SOURCE_CHANNEL;
             bytestream_get_buffer(&buf_temp, rt->flv_header + rt->flv_header_bytes, copy);
             rt->flv_header_bytes += copy;
             size_temp            -= copy;
@@ -2650,16 +2651,19 @@ static int rtmp_write(URLContext *s, const uint8_t *buf, int size)
             bytestream_get_be24(&header);
             rt->flv_size = pktsize;
 
+            if (pkttype == RTMP_PT_VIDEO)
+                channel = RTMP_VIDEO_CHANNEL;
+
             //force 12bytes header
             if (((pkttype == RTMP_PT_VIDEO || pkttype == RTMP_PT_AUDIO) && ts == 0) ||
                 pkttype == RTMP_PT_NOTIFY) {
                 if (pkttype == RTMP_PT_NOTIFY)
                     pktsize += 16;
-                rt->prev_pkt[1][RTMP_SOURCE_CHANNEL].channel_id = 0;
+                rt->prev_pkt[1][channel].channel_id = 0;
             }
 
             //this can be a big packet, it's better to send it right here
-            if ((ret = ff_rtmp_packet_create(&rt->out_pkt, RTMP_SOURCE_CHANNEL,
+            if ((ret = ff_rtmp_packet_create(&rt->out_pkt, channel,
                                              pkttype, ts, pktsize)) < 0)
                 return ret;