[Live-devel] openRTSP Quicktime compatibility

[Stu Tomlinson]

Hello,

I have been trying to use openRTSP (from liveMedia dated 2010.12.05) to
record clips from an IP camera that supports RTSP streaming of MPEG-4
clips, but the recorded clips would not play back in Quicktime 7.6.8
(1675) on Windows. For .mov files (recorded with -q) the clip would
appear to play (progress bar would move) but the video content is a
blank/white image, for .mp4 files (recorded with -4) Quicktime would
refuse to load the clip reporting "Error -2010: the movie contains some
invalid data ()".

I discovered that simply "re-packaging" the clip without any re-encoding
of the actual stream using "mencoder" resulted in files that would play
without issue.

After analyzing the differences in the files produced by openRTSP &
mencoder I have been able to come up with the attached minimal patch to
change the "magic bytes" recorded in the esds atom, and with this patch
applied openRTSP will record files (.mov or .mp4) that Quicktime is able
to play without any further changes.

One other difference I noticed is that the mencoded file does not seem
to have the 0-word in the file after the esds atom, but I saw no
difference in compatibility with Quicktime when removing that from
QuickTimeFileSink.cpp (line 1929), so this patch does not touch that.

Regards,


Stu.
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