#15 DashCast message: "bad src image pointers"

[Urs Muller]

Hi,

When running DashCast (r4783) I'm getting hundres of the following messages:
[swscaler @ 0x19e6580] bad src image pointers

Later, when trying to play the segments in Chrome (using the DASH IF Reference Player from http://dashif.org/software/) the player reports: MEDIA_ERR_SRC_NOT_SUPPORTED.

The exact DashCast call is:
DashCast -av H264_test1_Talkinghead_mp4_480x360.mp4 -seg-dur 1000 -frag-dur 200

I'm using the example dashcast.conf file from http://gpac.wp.mines-telecom.fr/dashcast/ and a simple example mp4 file from http://download.wavetlan.com/SVV/Media/HTTP/H264/Talkinghead_Media/H264_test1_Talkinghead_mp4_480x360.mp4

It appears that something goes wrong in the call to attribute_align_arg() of libswscale.

Any hints would be appreciated.

Thanks,
Urs

[Jean Le Feuvre]

Could you check the latest versions of DashCast ? This should be fixed on svn

[Urs Muller]

Thanks for the update. I just tried the latest SVN revision (r4933) but had not much success: DashCast seems to do something, then prints "MPD file generated: output/dashcast.mpd", then hangs. In the output directory there is the .mp4 file and one .m4s segment for each video and audio resolution. Attached is the full console output from DashCast.

[Jean Le Feuvre]

I believe we still have some issues with audio, that could explain. Have you tried with a single video file ?

[Urs Muller]

I tried just now and that produced a segmentation fault by DashCast, after it apparently generated the video segments.
Note, that I switched to using ffmpeg for generating the different video and audio representations, then MP4Box for converting those into DASH. That works fine for us.

[Romain Bouqueau]

@Urs: what's your OS?

[Urs Muller]

Ubuntu 13.10 Desktop, 64-bit