Function main

doc/examples/vaapi_transcode.c:222–303

}

int main(int argc, char **argv)
{
    const AVCodec *enc_codec;
    int ret = 0;
    AVPacket *dec_pkt;

    if (argc != 4) {
        fprintf(stderr, "Usage: %s <input file> <encode codec> <output file>\n"
                "The output format is guessed according to the file extension.\n"
                "\n", argv[0]);
        return -1;
    }

    ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI, NULL, NULL, 0);
    if (ret < 0) {
        fprintf(stderr, "Failed to create a VAAPI device. Error code: %s\n", av_err2str(ret));
        return -1;
    }

    dec_pkt = av_packet_alloc();
    if (!dec_pkt) {
        fprintf(stderr, "Failed to allocate decode packet\n");
        goto end;
    }

    if ((ret = open_input_file(argv[1])) < 0)
        goto end;

    if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) {
        fprintf(stderr, "Could not find encoder '%s'\n", argv[2]);
        ret = -1;
        goto end;
    }

    if ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, argv[3]))) < 0) {
        fprintf(stderr, "Failed to deduce output format from file extension. Error code: "
                "%s\n", av_err2str(ret));
        goto end;
    }

    if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) {
        ret = AVERROR(ENOMEM);
        goto end;
    }

    ret = avio_open(&ofmt_ctx->pb, argv[3], AVIO_FLAG_WRITE);
    if (ret < 0) {
        fprintf(stderr, "Cannot open output file. "
                "Error code: %s\n", av_err2str(ret));
        goto end;
    }

    /* read all packets and only transcoding video */
    while (ret >= 0) {
        if ((ret = av_read_frame(ifmt_ctx, dec_pkt)) < 0)
            break;

        if (video_stream == dec_pkt->stream_index)