----- Forwarded message from [email protected] -----
Date: Wed, 18 Feb 2009 12:56:56 +0100
From: Muhammad Ali <[email protected]>
Reply-To: Muhammad Ali <[email protected]>
Subject: Re: [libav-user] Encoding MPEG2VIDEO
To: Bruce Weir <[email protected]>
Thanks you respnose me.
I am using the same way as define in Example but the output is not correct.
its lost are the image and show only colores. code only encode the 60
frames and write in the file.. when i run the encode video or decode
the video its its work but not show the original image.. whats your
suggestion whats i do..
"code of developing he image frame and writing in file"
pCodeCtx=avcodec_alloc_context();
AVFrame *frame;
frame=avcodec_alloc_frame();
//Set the codeing attributes...
pCodeCtx->bit_rate=40000;
pCodeCtx->width=352;
pCodeCtx->height=288;
pCodeCtx->time_base=(AVRational){1,25};
pCodeCtx->gop_size=10;
//pCodeCtx->max_b_frames=1;
pCodeCtx->pix_fmt=PIX_FMT_YUV420P;
//Open The Code
if(avcodec_open(pCodeCtx,codec)<0)
printf("Codec in not Open\n");
//Open the File
f = fopen(outfile, "wb");
if (!f) {
fprintf(stderr, "could not open %s\n",outfile);
exit(1);
}
printf("file is opend\n");
int j, out_size, size, x, y, outbuf_size;
uint8_t *outbuf, *frame_buf;
outbuf_size=100000;
outbuf=malloc(outbuf_size);
size=pCodeCtx->width *pCodeCtx->height;
frame_buf=malloc((size*3)/2);
frame->data[0]=frame_buf;
frame->data[1]=frame->data[0]+size;
frame->data[2]=frame->data[1]+size/4;
frame->linesize[0] = pCodeCtx->width;
frame->linesize[1] = pCodeCtx->width / 2;
frame->linesize[2] = pCodeCtx->width / 2;
//Encode vide Loop
for(j=0;j<60;j++)
{
for(y=0;y<pCodeCtx->height;y++) {
for(x=0;x<pCodeCtx->width;x++) {
frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;
}
}
/* Cb and Cr */
for(y=0;y<pCodeCtx->height/2;y++) {
for(x=0;x<pCodeCtx->width/2;x++) {
frame->data[1][y * frame->linesize[1] + x] = 128 +
y + i * 2;
frame->data[2][y * frame->linesize[2] + x] = 64 +
x + i * 5;
}
}
/* encode the image */
out_size = avcodec_encode_video(pCodeCtx, outbuf, outbuf_size,frame);
printf("encoding frame %3d (size=%5d)\n", j, out_size);
fwrite(outbuf, 1, out_size, f);
//printf("-----frme write in file \n");
Thanks you resopnse me
Quoting Bruce Weir <[email protected]>:
> Easiest thing to do is to work your way through the example in
>
> ffmpeg/libavcodec/apiexample.c
>
> You should be able to build and run it, and then modify it as required.
>
> Without looking at your code, it is hard to work out your bug, but
> at a guess you should probably pay attention to how you are packing
> your AVFrames before encoding.
>
> ________________________________
>
> From: [email protected] on behalf of Muhammad Ali
> Sent: Wed 18/02/2009 09:06
> To: [email protected]
> Subject: [libav-user] Encoding MPEG2VIDEO
>
>
>
>
> Hello all,
>
>
>
> I'm having troubles creating mpeg2 files. from the MPG format video.
> I am using the avcodec example to encode the video.. its run properly.
> but when i run the decode the encode video its lost original video
> picture .. we can see onle differents colors..
>
> Can someone please advise me on what parameters should I set in the
> AVCodecContext for encoding an mpeg2? Are there any caveats that I
> should be aware of?
>
> I am new in using the ffmpeg ...so please advise me the whats i do
> and if you have any metrial about this please advise me..
>
> Thanks in Advance
> --
> Zeshan ALI
> Phd Student
> Tu-Braunschewig Germany
>
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--
Zeshan ALI
Phd Student
Tu-Braunschewig Germany
----- End forwarded message -----
--
Zeshan ALI
Phd Student
Tu-Braunschewig Germany
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