Click here to Skip to main content
14,303,949 members

Video Encoding In C# (FFMPEG)

bbmonzta asked:

Open original thread
Hi,
What i am trying to do here is to encode a AVI video into a MPEG2 Transport Stream file in C# using ffmpeg. I'm using Tao.FFMPEG C# library.

I have been google-ing all the examples i could find and all of them are in C code.

e.g
* Video encoding example
 */
void video_encode_example(const char *filename)
{
    AVCodec *codec;
    AVCodecContext *c= NULL;
    int i, out_size, size, x, y, outbuf_size;
    FILE *f;
    AVFrame *picture;
    uint8_t *outbuf, *picture_buf;
    printf("Video encoding\n");
    /* find the mpeg1 video encoder */
    codec = avcodec_find_encoder(CODEC_ID_MPEG1VIDEO);
    if (!codec) {
        fprintf(stderr, "codec not found\n");
        exit(1);
    }
    c= avcodec_alloc_context();
    picture= avcodec_alloc_frame();
    /* put sample parameters */
    c->bit_rate = 400000;
    /* resolution must be a multiple of two */
    c->width = 352;
    c->height = 288;
    /* frames per second */
    c->time_base= (AVRational){1,25};
    c->gop_size = 10; /* emit one intra frame every ten frames */
    c->max_b_frames=1;
    c->pix_fmt = PIX_FMT_YUV420P;
    /* open it */
    if (avcodec_open(c, codec) < 0) {
        fprintf(stderr, "could not open codec\n");
        exit(1);
    }
    /* the codec gives us the frame size, in samples */
    f = fopen(filename, "wb");
    if (!f) {
        fprintf(stderr, "could not open %s\n", filename);
        exit(1);
    }
    /* alloc image and output buffer */
    outbuf_size = 100000;
    outbuf = malloc(outbuf_size);
    size = c->width * c->height;
    picture_buf = malloc((size * 3) / 2); /* size for YUV 420 */
    picture->data[0] = picture_buf;
    picture->data[1] = picture->data[0] + size;
    picture->data[2] = picture->data[1] + size / 4;
    picture->linesize[0] = c->width;
    picture->linesize[1] = c->width / 2;
    picture->linesize[2] = c->width / 2;
    /* encode 1 second of video */
    for(i=0;i<25;i++) {
        fflush(stdout);
        /* prepare a dummy image */
        /* Y */
        for(y=0;y<c->height;y++) {
            for(x=0;x<c->width;x++) {
                picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
            }
        }
        /* Cb and Cr */
        for(y=0;y<c->height/2;y++) {
            for(x=0;x<c->width/2;x++) {
                picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
                picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
            }
        }
        /* encode the image */
        out_size = avcodec_encode_video(c, outbuf, outbuf_size, picture);
        printf("encoding frame %3d (size=%5d)\n", i, out_size);
        fwrite(outbuf, 1, out_size, f);
    }
    /* get the delayed frames */
    for(; out_size; i++) {
        fflush(stdout);
        out_size = avcodec_encode_video(c, outbuf, outbuf_size, NULL);
        printf("write frame %3d (size=%5d)\n", i, out_size);
        fwrite(outbuf, 1, out_size, f);
    }
    /* add sequence end code to have a real mpeg file */
    outbuf[0] = 0x00;
    outbuf[1] = 0x00;
    outbuf[2] = 0x01;
    outbuf[3] = 0xb7;
    fwrite(outbuf, 1, 4, f);
    fclose(f);
    free(picture_buf);
    free(outbuf);
    avcodec_close(c);
    av_free(c);
    av_free(picture);
    printf("\n");
}

-----------------------------------------------------------------------
-----------------------------------------------------------------------
Take note:

I have to do this video encoding part in C#.

I have tried finding softwares e.g solid ffmpeg which doesnt help me much when these softwares don't provide the source codes.

My question is how do i change this codes into C#?

I'm also rather new to the language hence i don't really know how to convert this part of the code from C to C#.
Any help is much appreciated.
Tags: C#

Preview



When answering a question please:
  1. Read the question carefully.
  2. Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
  3. If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
  4. Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.
Let's work to help developers, not make them feel stupid.
Please note that all posts will be submitted under the The Code Project Open License (CPOL).




CodeProject, 503-250 Ferrand Drive Toronto Ontario, M3C 3G8 Canada +1 416-849-8900 x 100