gstreamer playbin only video

I am using the following pipeline

gst-launch-0.10 playbin2 uri=file:///mnt/hash.mp4 video-sink="imxv4l2sink" flags=0x57

This works fine for the video file ( mp4 ) which doesn't have video in it. But when I pass a mp4 file which has both video and audio it fails to play.

Can you please help me in reconstructing the pipeline to allow it to work on both kind of files: MP4 with only video, MP4 with both audio and video

I was able to solve by changing the value of flags field to disable audio.

gst-launch-0.10 playbin2 uri=file:///mnt/hash.mp4 video-sink="imxv4l2sink" flags=0x51