ffmpeg overlay video with transparent background - ffmpeg

Question

I have 2 videos: background (mp4) and overlay (mov), overlay has transparent background. I am trying to put video with transparent background as overlay on top of background video. But unfortunately overlay completely cover background video with black background instead of transparency.
I am using following command:
Here is the full output for the command:
ffmpeg -y -i rec_20151027_123445.mp4 -vf "[in]format=rgba[ina];movie=overlay_1920x1080_1.mov[o];[ina][o]overlay=0:0" -vcodec qtrle converted.mov
ffmpeg version 2.6 Copyright (c) 2000-2015 the FFmpeg developers
built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
configuration: --prefix=/usr/local/Cellar/ffmpeg/2.6_1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
libavutil 54. 20.100 / 54. 20.100
libavcodec 56. 26.100 / 56. 26.100
libavformat 56. 25.101 / 56. 25.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 11.102 / 5. 11.102
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'rec_20151027_123445.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2015-10-27 10:34:57
location : +50.0474+036.2031/
location-eng : +50.0474+036.2031/
Duration: 00:00:06.04, start: 0.000000, bitrate: 16863 kb/s
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080, 16837 kb/s, SAR 1:1 DAR 16:9, 29.62 fps, 29.75 tbr, 90k tbn, 180k tbc (default)
Metadata:
creation_time : 2015-10-27 10:34:57
handler_name : VideoHandle
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 95 kb/s (default)
Metadata:
creation_time : 2015-10-27 10:34:57
handler_name : SoundHandle
[swscaler # 0x7fa3db0ada00] No accelerated colorspace conversion found from yuva420p to argb.
Output #0, mov, to 'converted.mov':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
location-eng : +50.0474+036.2031/
location : +50.0474+036.2031/
encoder : Lavf56.25.101
Stream #0:0(eng): Video: qtrle (rle / 0x20656C72), argb, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 29.75 fps, 15232 tbn, 29.75 tbc (default)
Metadata:
creation_time : 2015-10-27 10:34:57
handler_name : VideoHandle
encoder : Lavc56.26.100 qtrle
Stream #0:1(eng): Audio: aac (libvo_aacenc) (mp4a / 0x6134706D), 48000 Hz, mono, s16, 128 kb/s (default)
Metadata:
creation_time : 2015-10-27 10:34:57
handler_name : SoundHandle
encoder : Lavc56.26.100 libvo_aacenc
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> qtrle (native))
Stream #0:1 -> #0:1 (aac (native) -> aac (libvo_aacenc))
Press [q] to stop, [?] for help
frame= 179 fps= 19 q=0.0 Lsize= 126621kB time=00:00:06.05 bitrate=171213.2kbits/s dup=1 drop=1
video:126519kB audio:95kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.005055%