[Libav-user] Decoding Problem (got_picture always return 0)

[Yinxia]

Hi dear all,

I am a newbie to ffmpeg and I would like to decode the bitstream, which is
encoded using libx264 at the server end and sent to client frame by frame.

I wrote a function decodeFrame to decode this bitstream frame by frame,
this function is called in a loop, each time recieves a new frame:

void decodeFrame( int size, unsigned char *data)
{
 avpkt.size = size;
avpkt.data = (uint8_t *)(data);

/*decode each frame*/
 len = avcodec_decode_video2(c, picture, &got_picture, avpkt.size);
if (len < 0) {
 fprintf(stderr, "[avcodec][Err] Error while decoding frame %d\n",frame);
 exit(1);
}
 if (got_picture) {
printf("[avcodec] Saving frame %3d\n",frame);
 fflush(stdout);
_snprintf(buf, sizeof(buf), "/temp/video%d.pgm", frame); // not found
 pgmSave(picture->data[0], picture->linesize[0], c->width, c->height, buf);
 frame++;
}
}

I can successfully get the value of len, which is exactly the size of
frame, however, *the value of *got_picture *is always 0. *Can anyone help
me with this?
*
*
PS. this is the init function of decoder.

void initDecoder()
{
avcodec_register_all();

av_init_packet(&avpkt);
memset(inbuf + INBUF_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 printf("[avcodec] Frame decoding initializing\n");

/*choose correct video decoder*/
 codec = avcodec_find_decoder(CODEC_ID_MPEG4);
if ( !codec ) {
fprintf(stderr, "[avcodec][Err] codec not found!\n");
 exit(1);
}

c = avcodec_alloc_context3(codec);
 picture = avcodec_alloc_frame();

if(codec->capabilities&CODEC_CAP_TRUNCATED)
           c->flags|= CODEC_FLAG_TRUNCATED; /* we do not send complete
frames */

    /* open it */
    if (avcodec_open2(c, codec, NULL) < 0) {
        fprintf(stderr, "[avcodec][Err] could not open codec\n");
        exit(1);
    }


frame = 0;

}


Thank you very much!
Yinxia


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