Hi,
I found, the problems: the bitrate was to low, I changed it to
width*height*4*framerate.
I also deleted this line : p_oc->oformat->flags = AVFMT_RAWPICTURE;
I changed the while loop:
while(...)
{
unsigned char* data = //some cool image in YUV
/* encode the image */
out_size = avcodec_encode_video( c, p_video_outbuf,
m_video_outbuf_size, p_picture );
/* if zero size, it means the image was buffered */
if ( out_size > 0 )
{
AVPacket pkt;
av_init_packet( &pkt );
pkt.pts = av_rescale_q( c->coded_frame->pts, c->time_base,
st->time_base );
if( c->coded_frame->key_frame )
{
pkt.flags |= PKT_FLAG_KEY;
}
pkt.stream_index = p_video_st->index;
pkt.data = p_video_outbuf;
pkt.size = out_size;
/* write the compressed frame in the media file */
ret = av_write_frame( p_oc, &pkt );
}
}
So this is now OK for storing raw RGB data in an AVI container.
But now I have another problem: I want to store raw GRAY16 data in an AVI
container. So I changed "c->pix_fmt = PIX_FMT_YUV420P;" to "c->pix_fmt =
PIX_FMT_GRAY16LE;"
When I play the file, VLC tells me: "rawvideo warning: invalid frame size
(614400 < 921600)". So obviously VLC is waiting for 3 bytes long pixels whereas
GRAY16 is 2 bytes long.
Do you know why?
________________________________________
De : [email protected] [[email protected]] de la
part de DONGIEUX-AKKA Christophe (SAGEM DEFENSE SECURITE)
[[email protected]]
Date d'envoi : jeudi 19 août 2010 18:29
À : [email protected]
Objet : [libav-user] Create raw videos in AVI container
Hello,
I need to create raw videos in AVI container.
I don't understand how I can achieve that...
This is what I am doing and that doesn't work:
av_register_all();
AVFormatContext* p_oc = av_alloc_format_context();
p_oc->oformat = guess_format( 0, "foo.avi", 0 );
p_oc->oformat->video_codec = CODEC_ID_RAWVIDEO;
p_oc->oformat->flags = AVFMT_RAWPICTURE;
AVStream* st = av_new_stream( p_oc, 0 );
AVCodecContext *c = st->codec;
c->codec_id = CODEC_ID_RAWVIDEO;
c->codec_type = CODEC_TYPE_VIDEO;
c->bit_rate = 400000;
c->width = width;
c->height = height;
c->time_base.den = framerate;
c->time_base.num = 1;
c->gop_size = 1;
c->pix_fmt = PIX_FMT_YUV420P;
av_set_parameters( p_oc, 0 );
AVCodec* codec = avcodec_find_encoder( st->codec->codec_id );
avcodec_open( c, codec );
// pictures allocation
url_fopen( &p_oc->pb, "foo.avi", URL_WRONLY );
av_write_header( p_oc );
while(...)
{
unsigned char* data = //some cool image in YUV
AVPacket pkt;
av_init_packet( &pkt );
pkt.flags |= PKT_FLAG_KEY;
pkt.stream_index = st->index;
pkt.data = (uint8_t *)p_picture;
pkt.size = sizeof(AVPicture);
int ret = av_write_frame( p_oc, &pkt );
}
av_write_trailer( p_oc );
// desallocation
I precise that in my real code, all functions returns are checked and are OK.
When I try to play the video with VLC, something is played (duration is good),
but nothing is displayed, and I've got plenty of error messages : "rawvideo
warning: invalid frame size (32 < 460800)"
Could you help me, please?
Thanks in advance,
Chris.
#
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