h264parse srcpad buffers [NAL,SPS,PPS] ?? experts needed

[ericcardmanNo3]

hi!

i do:
gst-launch filesrc location=my.264 ! h264parse ! myh264decoder ! ffmpegcolorspace ! fbdevsink

the filesrc passes buffers of 4096 byte to h264parse.
h264parse passes a 23 byte buffer to myh264decoder where i decode to get stream configuration - works.
But next buffer is 8 byte and i cant push the decoded buffer to downstream.

0:00:01.265381034  1526    0x7b388 DEBUG              h264parse gsth264parse.c:956:gst_h264_parse_sink_event:<h264parse0> Pushing newseg rate 1, applied rate 1, format 2, start 0, stop 3041866, pos 0
0:00:01.268311470  1526    0x7b388 DEBUG              h264parse gsth264parse.c:897:gst_h264_parse_chain:<h264parse0> received buffer of size 4096
0:00:01.269130929  1526    0x7b388 DEBUG              h264parse gsth264parse.c:499:gst_h264_parse_chain_forward:<h264parse0> NAL type: 7, ref_idc: 1
0:00:01.269879079  1526    0x7b388 DEBUG              h264parse gsth264parse.c:540:gst_h264_parse_chain_forward:<h264parse0> we have a SPS or PPS NAL
0:00:01.270759876  1526    0x7b388 DEBUG              h264parse gsth264parse.c:553:gst_h264_parse_chain_forward:<h264parse0> pushing buffer 0x432c0, size 23, ts 0:00:00.000000000

[Marc Leeman]

> 0:00:01.269130929  1526    0x7b388 DEBUG              h264parse
> gsth264parse.c:499:gst_h264_parse_chain_forward:<h264parse0> NAL type: 7,
> ref_idc: 1
> 0:00:01.269879079  1526    0x7b388 DEBUG              h264parse
> gsth264parse.c:540:gst_h264_parse_chain_forward:<h264parse0> we have a SPS
> or PPS NAL

Come to think of it; wouldn't it make more sense to move the send-config
and config-interval options from rtpmpv4pay and rtph264pay to
mpeg4videparse and h264parse respectively?

This way; streaming back on the network would be supported for any
encapsulation (es, ts, rtp) instead of just rtp ATM.

--
  greetz, marc
Anyone who imagines that all fruits ripen at the same time
as the strawberries, knows nothing about grapes.
                -- Philippus Paracelsus
crichton 2.6.26 #1 PREEMPT Tue Jul 29 21:17:59 CDT 2008 GNU/Linux

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[Kapil Agrawal]

you mean the buffer pushed by filesrc is 8 bytes ?
As IMHO h264parse pushes one NALU for every buffer, so there might be an issue with your decoder ?

-kapil

On Tue, Mar 30, 2010 at 9:20 PM, ericcardmanNo3 <[hidden email]> wrote:

hi!

i do:
gst-launch filesrc location=my.264 ! h264parse ! myh264decoder !
ffmpegcolorspace ! fbdevsink

the filesrc passes buffers of 4096 byte to h264parse.
h264parse passes a 23 byte buffer to myh264decoder where i decode to get
stream configuration - works.
But next buffer is 8 byte and i cant push the decoded buffer to downstream.

0:00:01.265381034  1526    0x7b388 DEBUG              h264parse
gsth264parse.c:956:gst_h264_parse_sink_event:<h264parse0> Pushing newseg
rate 1, applied rate 1, format 2, start 0, stop 3041866, pos 0
0:00:01.268311470  1526    0x7b388 DEBUG              h264parse
gsth264parse.c:897:gst_h264_parse_chain:<h264parse0> received buffer of size
4096
0:00:01.269130929  1526    0x7b388 DEBUG              h264parse
gsth264parse.c:499:gst_h264_parse_chain_forward:<h264parse0> NAL type: 7,
ref_idc: 1
0:00:01.269879079  1526    0x7b388 DEBUG              h264parse
gsth264parse.c:540:gst_h264_parse_chain_forward:<h264parse0> we have a SPS
or PPS NAL
0:00:01.270759876  1526    0x7b388 DEBUG              h264parse
gsth264parse.c:553:gst_h264_parse_chain_forward:<h264parse0> pushing buffer
0x432c0, size 23, ts 0:00:00.000000000

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[Marco Ballesio]

Hi,

On Tue, Mar 30, 2010 at 6:50 PM, ericcardmanNo3 <[hidden email]> wrote:

>
> hi!
>
> i do:
> gst-launch filesrc location=my.264 ! h264parse ! myh264decoder !
> ffmpegcolorspace ! fbdevsink
>
> the filesrc passes buffers of 4096 byte to h264parse.
> h264parse passes a 23 byte buffer to myh264decoder where i decode to get
> stream configuration - works.
> But next buffer is 8 byte and i cant push the decoded buffer to downstream.
>
> 0:00:01.265381034  1526    0x7b388 DEBUG              h264parse
> gsth264parse.c:956:gst_h264_parse_sink_event:<h264parse0> Pushing newseg
> rate 1, applied rate 1, format 2, start 0, stop 3041866, pos 0
> 0:00:01.268311470  1526    0x7b388 DEBUG              h264parse
> gsth264parse.c:897:gst_h264_parse_chain:<h264parse0> received buffer of size
> 4096
> 0:00:01.269130929  1526    0x7b388 DEBUG              h264parse
> gsth264parse.c:499:gst_h264_parse_chain_forward:<h264parse0> NAL type: 7,
> ref_idc: 1

I think the problem here is that the parser returns ONLY an SPS and
your decoder is emitting a buffer after it.. as SPS/PPS contain only
metadata no meaningful (render-able) information can be emitted from
the decoder, so I'd rather ignore the output buffer which is indeed to
small to be rendered (unless you have a 3x2 pixels image).

>From my pov the parser is kind of misleading in many cases. You may
check on gst-dsp about how to avoid it.

Regards,
Marco

> 0:00:01.269879079  1526    0x7b388 DEBUG              h264parse
> gsth264parse.c:540:gst_h264_parse_chain_forward:<h264parse0> we have a SPS
> or PPS NAL
> 0:00:01.270759876  1526    0x7b388 DEBUG              h264parse
> gsth264parse.c:553:gst_h264_parse_chain_forward:<h264parse0> pushing buffer
> 0x432c0, size 23, ts 0:00:00.000000000
>
> --
> View this message in context: http://n4.nabble.com/h264parse-srcpad-buffers-NAL-SPS-PPS-experts-needed-tp1745406p1745406.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
>
> ------------------------------------------------------------------------------
> Download Intel&#174; Parallel Studio Eval
> Try the new software tools for yourself. Speed compiling, find bugs
> proactively, and fine-tune applications for parallel performance.
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>

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