The created mp4 files are not streaming video files but "standard" mp4 files with the metadata (moov atom) at the end.
To make it possible to simply stream them, add the "-movflags faststart" option to the avconv/ffmpeg command. This will add a second pass, but minimal as it is only a metadata copy (copies entire file), but no encoding.
Also remove the double "-r 6"
The created mp4 files are not streaming video files but "standard" mp4 files with the metadata (moov atom) at the end. To make it possible to simply stream them, add the "-movflags faststart" option to the avconv/ffmpeg command. This will add a second pass, but minimal as it is only a metadata copy (copies entire file), but no encoding. Also remove the double "-r 6"