[Ffmpeg-devel] Play MPEG4 via rtsp will cause crash ?

[Patrick Roberts]

  Check to make sure the mdat atom is last in the
3GP/MP4 file you want to stream (use mp4dump).  I
think 3GP/MP4 files also must be hinted (have a 'hint'
track) for helix to serve them correctly.  ffmpeg
currently does not put mdat last, so you  you are
creating the 3GP/MP4 file with ffmpeg, you will need
to use a different tool to move the atoms around.
(ffmpeg doesn't yet write hint tracks either, so
you'll need to use another tool to hint the file.)
mp4optimize is one tool that does this, but it also
sometimes removes atoms it doesn't think are necessary
and ends up breaking the file. 

-Pat

--- Liu.Akewart at iac.com.tw wrote:

> Hi :
> 
> 	I wrote a simple test file for testing ffmpeg
> streaming mode via rtsp. 
> Remote server is helix server and support .3gp file
> streaming. And while I try to 
> play the 3GPP flle vai rtsp , it finally got a
> crush. I just wondered if the MPEG4 
> streaming is ready for now ?( I modified rtsp.c and
> add MIME support for AMR_NB)
> 
> 	I do some compare withe local file decoding and
> found our decoder need
> 'mp4v' tag for init the mpeg4 decoder, but if the
> file comes with the rtsp , it won't got 
> 'mp4v' data , just come the frame datas in 'mdat'.
> Here is the log:
> 
> # ./fftest rtsp://10.22.2.6/dongfengpo.3gp
> Register all codecs
> MIME type: MP4V-ES
> MIME type: AMR
> [rtsp @ 0x10909c]hello state=0
> [rtsp @ 0x10909c]hello state=1
> [NULL @ 0x140ed0]RTP: PT=60: bad cseq 000b
> expected=0001
> Video : 176X144 Format:0 Codec: 12 FN:0 SID:0
> Audio : fs:8000 ch:1 Codec:73728 FN:0 SID:1
> Duration: -9223372036854775808
> Packet SID:0 PTS:0 DTS:0 SIZE:547
> [mpeg4 @ 0x140ed0]warning: first frame is no
> keyframe
> V: decoded 547 bytes
> Outputing RGB File...Done.
> Packet SID:0 PTS:40000 DTS:40000 SIZE:159
> V: decoded 159 bytes
> Outputing RGB File...Done.
> Packet SID:0 PTS:80000 DTS:80000 SIZE:262
> V: decoded 262 bytes
> Outputing RGB File...Done.
> Packet SID:0 PTS:120000 DTS:120000 SIZE:3808
> V: decoded 3808 bytes
> Outputing RGB File...Done.
> Packet SID:0 PTS:160000 DTS:160000 SIZE:527
> V: decoded 527 bytes
> Outputing RGB File...Done.
> [amr_nb @ 0x140ed0]RTP: PT=61: bad cseq 0002
> expected=0001
> Packet SID:1 PTS:-9223372036854775808
> DTS:-9223372036854775808 SIZE:801
> A:decoded 803 bytes with 16640 out and 527 source
> data
> [mpeg4 @ 0x140ed0]hmm, seems the headers arnt
> complete, trying to guess time_increment_bits
> [mpeg4 @ 0x140ed0]my guess is 1 bits ;)
> [mpeg4 @ 0x140ed0]Error, header damaged or not MPEG4
> header (qscale=0)
> Packet SID:0 PTS:200000 DTS:200000 SIZE:251
> [mpeg4 @ 0x140ed0]picture size invalid
> (4294443008x0)
> V: decoded -1 bytes
> Marker bit missing before vop_coded
> Packet SID:0 PTS:240000 DTS:240000 SIZE:64
> [mpeg4 @ 0x140ed0]picture size invalid
> (4294443008x0)
> V: decoded -1 bytes
> Marker bit missing before vop_coded
> Packet SID:0 PTS:280000 DTS:280000 SIZE:226
> [mpeg4 @ 0x140ed0]picture size invalid
> (4294443008x0)
> V: decoded -1 bytes
> Marker bit missing before vop_coded
> [mpeg4 @ 0x140ed0]Error, header damaged or not MPEG4
> header (qscale=0)
> Packet SID:0 PTS:320000 DTS:320000 SIZE:201
> [mpeg4 @ 0x140ed0]picture size invalid
> (4294443008x0)
> V: decoded -1 bytes
> Marker bit missing before vop_coded
> [mpeg4 @ 0x140ed0]Error, header damaged or not MPEG4
> header (qscale=0)
> Packet SID:0 PTS:360000 DTS:360000 SIZE:181
> [mpeg4 @ 0x140ed0]picture size invalid
> (4294443008x0)
> V: decoded -1 bytes
> Packet SID:0 PTS:400000 DTS:400000 SIZE:164
> [mpeg4 @ 0x140ed0]picture size invalid
> (4294443008x0)
> V: decoded -1 bytes
> Packet SID:0 PTS:440000 DTS:440000 SIZE:116
> [mpeg4 @ 0x140ed0]picture size invalid
> (4294443008x0)
> V: decoded -1 bytes
> [mpeg4 @ 0x140ed0]Error, header damaged or not MPEG4
> header (qscale=0)
> Packet SID:0 PTS:480000 DTS:480000 SIZE:406
> [mpeg4 @ 0x140ed0]picture size invalid
> (4294443008x0)
> V: decoded -1 bytes
> Packet SID:1 PTS:-9223372036854775808
> DTS:-9223372036854775808 SIZE:801
> A:decoded 803 bytes with 16640 out and -1 source
> data
> [mpeg4 @ 0x140ed0]hmm, seems the headers arnt
> complete, trying to guess time_increment_bits
> [mpeg4 @ 0x140ed0]my guess is 1 bits ;)
> [mpeg4 @ 0x140ed0]Error, header damaged or not MPEG4
> header (qscale=0)
> Packet SID:0 PTS:520000 DTS:520000 SIZE:154
> [mpeg4 @ 0x140ed0]picture size invalid
> (65528x4294443008)
> V: decoded -1 bytes
> Marker bit missing before vop_coded
> Packet SID:0 PTS:560000 DTS:560000 SIZE:335
> [mpeg4 @ 0x140ed0]picture size invalid
> (65528x4294443008)
> V: decoded -1 bytes
> 
> 	Best regards
> 				-akewart
> 
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> 



		
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