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Am 31.05.2012 15:51, schrieb Christian Brümmer:
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Am 30.05.2012 12:44, schrieb Christian Brümmer:
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Am 30.05.2012 04:07, schrieb Kalileo:
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<pre wrap="">On May 29, 2012, at 20:26 , Christian Brümmer wrote:
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<pre wrap="">"Cant be that hard - or? "
Okay now im pretty sure it is:
I read AVCodecContex.extradata contains the informations i need. For decoding i used that code -> <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://cgit.lscube.org/cgit.cgi/feng/tree/src/media/parser/h264.c#n218">http://cgit.lscube.org/cgit.cgi/feng/tree/src/media/parser/h264.c#n218</a> - in a slightly modified way (replaced glib functions with e.g. libavs base64.h). Finally the decoding stuff is running - BUT...
my AVCodecContext.extradata_size == 0 <- what the heck?!? So no data for decoding and really no idea left how to get those informations.... WHAA!
I make desperate efforts but i cant get into that...
At least i need another hint. Im not asking for complete solution - its enough to know roughly the right way!
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<pre wrap="">>From what I think I understood extradata contains what you expect when your source is a video format with a global header.
What's the source format you use for your tests?
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I create dummy images (should be replaced later on) and encoding
them to x264 frames. Further i stream those images via rtsp
which is working on VLC but not on android and i thinks its a
stream configuration problem.<br>
<br>
When should extradata be filled? In my text a dont encode a
frame before i try to get the sps pps infos out of extradata. I
may have to call a special function or encode a frame or header
before?<br>
<br>
So my source format is:<br>
<br>
<small><small> codec = avcodec_find_encoder(c->codec_id);<br>
if(!codec)<br>
{<br>
std::cout << "Codec not found." <<
std::endl;<br>
std::cin.get();std::cin.get();exit(1);<br>
}<br>
<br>
<b>if(avcodec_get_context_defaults3 (c, codec) < 0)
// cause i dont know a working x264 configuration without
deprecated flags </b><br>
{<br>
std::cout << "Cannot get default codec
context! \n" << std::endl;<br>
std::cin.get();<br>
exit(1);<br>
}</small></small><br>
<br>
and<br>
<br>
<small><small> codec = stream->codec;<br>
codec->codec_id = codecID;<br>
codec->codec_type = AVMEDIA_TYPE_VIDEO;<br>
codec->bit_rate = mParameters.mBitRate;<br>
codec->width = mParameters.mWidth;<br>
codec->height = mParameters.mHeight;<br>
codec->time_base.den = mParameters.mFrameRate;<br>
codec->time_base.num = 1;<br>
codec->gop_size = mParameters.mFrameRate; <br>
codec->pix_fmt = PIXEL_FORMAT;<br>
codec->b_frame_strategy = 0;<br>
codec->level = 12;<br>
if(codec->codec_id == CODEC_ID_MPEG2VIDEO)<br>
codec->max_b_frames = 2; // for testing, B frames<br>
<br>
if(codec->codec_id == CODEC_ID_MPEG1VIDEO)<br>
codec->mb_decision = 2;<br>
<br>
if(context->oformat->flags &
AVFMT_GLOBALHEADER)<br>
codec->flags |= CODEC_FLAG_GLOBAL_HEADER;</small></small><br>
<br>
where mParamters are:<br>
<br>
<small><small> imLiveStreamParameters param;<br>
param.mBitRate = 4000;<br>
param.mCodec = "x264";<br>
param.mFrameRate = 24;<br>
param.mHeight = 240;<br>
param.mWidth = 320;</small></small><br>
<br>
Thank you for your reply!<br>
<br>
<br>
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<br>
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I figured out that if i add c->flags |=
CODEC_FLAG_GLOBAL_HEADER; for my video codec configuration
AVCodecContext.extradata.size is bigger than 0. <br>
Whats a reason for dont using global headers?<br>
<br>
Further i tried the av_sdp_create function again and now i get a
string containing "sprop-parameter-sets". My rtsp server accept
the sdp string but the vlc cant play my stream. But i will ask the
live555 mailing list for that!<br>
<br>
Are there other aspects i have to consider using global header
with x264 encoding (other configurations)?<br>
<br>
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<br>
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<br>
I finally got it. The created sdp-line is working as expected. I had
to create a substring and only parsing the "bytestream" of the
sprop-parameter-sets without the qualifier "sprop-parameter-sets=".
But thats nothing about libav.<br>
<br>
Thanks for reading,<br>
best regards,<br>
Christian<br>
<br>
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