ffmpeg.c

    AVFormatParameters params, *ap = &params;
    int err, i, ret, rfps, rfps_base;
    int64_t timestamp;

    if (!strcmp(filename, "-"))
        filename = "pipe:";

    using_stdin |= !strncmp(filename, "pipe:", 5) || 
                   !strcmp( filename, "/dev/stdin" );

    /* get default parameters from command line */
    memset(ap, 0, sizeof(*ap));
    ap->sample_rate = audio_sample_rate;
    ap->channels = audio_channels;
    ap->time_base.den = frame_rate;
    ap->time_base.num = frame_rate_base;
    ap->width = frame_width + frame_padleft + frame_padright;
    ap->height = frame_height + frame_padtop + frame_padbottom;
    ap->image_format = image_format;
    ap->pix_fmt = frame_pix_fmt;
    ap->device  = grab_device;
    ap->channel = video_channel;
    ap->standard = video_standard;
    ap->video_codec_id = video_codec_id;
    ap->audio_codec_id = audio_codec_id;
    if(pgmyuv_compatibility_hack)
        ap->video_codec_id= CODEC_ID_PGMYUV;

    /* open the input file with generic libav function */
    err = av_open_input_file(&ic, filename, file_iformat, 0, ap);
    if (err < 0) {
        print_error(filename, err);
        exit(1);
    }

    if(genpts)
        ic->flags|= AVFMT_FLAG_GENPTS;
    
    /* If not enough info to get the stream parameters, we decode the
       first frames to get it. (used in mpeg case for example) */
    ret = av_find_stream_info(ic);
    if (ret < 0 && verbose >= 0) {
        fprintf(stderr, "%s: could not find codec parameters\n", filename);
        exit(1);
    }

    timestamp = start_time;
    /* add the stream start time */
    if (ic->start_time != AV_NOPTS_VALUE)
        timestamp += ic->start_time;

    /* if seeking requested, we execute it */
    if (start_time != 0) {
        ret = av_seek_frame(ic, -1, timestamp, AVSEEK_FLAG_BACKWARD);
        if (ret < 0) {
            fprintf(stderr, "%s: could not seek to position %0.3f\n", 
                    filename, (double)timestamp / AV_TIME_BASE);
        }
        /* reset seek info */
        start_time = 0;
    }

    /* update the current parameters so that they match the one of the input stream */
    for(i=0;i<ic->nb_streams;i++) {
        AVCodecContext *enc = ic->streams[i]->codec;
#if defined(HAVE_THREADS)
        if(thread_count>1)
            avcodec_thread_init(enc, thread_count);
#endif
        enc->thread_count= thread_count;
        switch(enc->codec_type) {
        case CODEC_TYPE_AUDIO:
            //fprintf(stderr, "\nInput Audio channels: %d", enc->channels);
            audio_channels = enc->channels;
            audio_sample_rate = enc->sample_rate;
            if(audio_disable)
                ic->streams[i]->discard= AVDISCARD_ALL;
            break;
        case CODEC_TYPE_VIDEO:
            frame_height = enc->height;
            frame_width = enc->width;
	    frame_aspect_ratio = av_q2d(enc->sample_aspect_ratio) * enc->width / enc->height;
	    frame_pix_fmt = enc->pix_fmt;
            rfps      = ic->streams[i]->r_frame_rate.num;
            rfps_base = ic->streams[i]->r_frame_rate.den;
            enc->workaround_bugs = workaround_bugs;
            enc->error_resilience = error_resilience; 
            enc->error_concealment = error_concealment; 
            enc->idct_algo = idct_algo;
            enc->debug = debug;
            enc->debug_mv = debug_mv;            
            enc->lowres= lowres;
            if(lowres) enc->flags |= CODEC_FLAG_EMU_EDGE;
            if(bitexact)
                enc->flags|= CODEC_FLAG_BITEXACT;
            if(me_threshold)
                enc->debug |= FF_DEBUG_MV;
            if(gray_only)
                enc->flags |= CODEC_FLAG_GRAY;

            if (enc->time_base.den != rfps || enc->time_base.num != rfps_base) { 

                if (verbose >= 0)
                    fprintf(stderr,"\nSeems that stream %d comes from film source: %2.2f (%d/%d) -> %2.2f (%d/%d)\n",
                            i, (float)enc->time_base.den / enc->time_base.num, enc->time_base.den, enc->time_base.num,

                    (float)rfps / rfps_base, rfps, rfps_base);
            }
            /* update the current frame rate to match the stream frame rate */
            frame_rate      = rfps;
            frame_rate_base = rfps_base;

            enc->rate_emu = rate_emu;
            if(video_disable)
                ic->streams[i]->discard= AVDISCARD_ALL;
            else if(video_discard)
                ic->streams[i]->discard= video_discard;
            break;
        case CODEC_TYPE_DATA:
            break;
        case CODEC_TYPE_SUBTITLE:
            break;
        case CODEC_TYPE_UNKNOWN:
            break;
        default:
            av_abort();
        }
    }
    
    input_files[nb_input_files] = ic;
    input_files_ts_offset[nb_input_files] = input_ts_offset - (copy_ts ? 0 : timestamp);
    /* dump the file content */
    if (verbose >= 0)
        dump_format(ic, nb_input_files, filename, 0);

    nb_input_files++;
    file_iformat = NULL;
    file_oformat = NULL;
    image_format = NULL;

    grab_device = NULL;
    video_channel = 0;
    
    rate_emu = 0;
}

static void opt_grab(const char *arg)
{
    file_iformat = av_find_input_format(arg);
    opt_input_file("");
}

static void check_audio_video_inputs(int *has_video_ptr, int *has_audio_ptr)
{
    int has_video, has_audio, i, j;
    AVFormatContext *ic;

    has_video = 0;
    has_audio = 0;
    for(j=0;j<nb_input_files;j++) {
        ic = input_files[j];
        for(i=0;i<ic->nb_streams;i++) {
            AVCodecContext *enc = ic->streams[i]->codec;
            switch(enc->codec_type) {
            case CODEC_TYPE_AUDIO:
                has_audio = 1;
                break;
            case CODEC_TYPE_VIDEO:
                has_video = 1;
                break;
            case CODEC_TYPE_DATA:
            case CODEC_TYPE_UNKNOWN:
            case CODEC_TYPE_SUBTITLE:
                break;
            default:
                av_abort();
            }
        }
    }
    *has_video_ptr = has_video;
    *has_audio_ptr = has_audio;
}

static void new_video_stream(AVFormatContext *oc)
{
    AVStream *st;
    AVCodecContext *video_enc;
    int codec_id;
    
    st = av_new_stream(oc, oc->nb_streams);
    if (!st) {
        fprintf(stderr, "Could not alloc stream\n");
        exit(1);
    }
#if defined(HAVE_THREADS)
    if(thread_count>1)
        avcodec_thread_init(st->codec, thread_count);
#endif
    
    video_enc = st->codec;
    
    if(video_codec_tag)
        video_enc->codec_tag= video_codec_tag;
    
    if(   (video_global_header&1)
       || (video_global_header==0 && (oc->oformat->flags & AVFMT_GLOBALHEADER)))
        video_enc->flags |= CODEC_FLAG_GLOBAL_HEADER;
    if(video_global_header&2)
        video_enc->flags2 |= CODEC_FLAG2_LOCAL_HEADER;

    if (video_stream_copy) {
        st->stream_copy = 1;
        video_enc->codec_type = CODEC_TYPE_VIDEO;
    } else {
        char *p;
        int i;
        AVCodec *codec;
        
        codec_id = av_guess_codec(oc->oformat, NULL, oc->filename, NULL, CODEC_TYPE_VIDEO);
        if (video_codec_id != CODEC_ID_NONE)
            codec_id = video_codec_id;
                
        video_enc->codec_id = codec_id;
        codec = avcodec_find_encoder(codec_id);
                
        video_enc->bit_rate = video_bit_rate;
        video_enc->bit_rate_tolerance = video_bit_rate_tolerance;
        video_enc->time_base.den = frame_rate; 
        video_enc->time_base.num = frame_rate_base; 
        if(codec && codec->supported_framerates){
            const AVRational *p= codec->supported_framerates;
            AVRational req= (AVRational){frame_rate, frame_rate_base};
            const AVRational *best=NULL;
            AVRational best_error= (AVRational){INT_MAX, 1};
            for(; p->den!=0; p++){
                AVRational error= av_sub_q(req, *p);
                if(error.num <0) error.num *= -1;
                if(av_cmp_q(error, best_error) < 0){
                    best_error= error;
                    best= p;
                }
            }
            video_enc->time_base.den= best->num;
            video_enc->time_base.num= best->den;
        }
                
        video_enc->width = frame_width + frame_padright + frame_padleft;
        video_enc->height = frame_height + frame_padtop + frame_padbottom;
        video_enc->sample_aspect_ratio = av_d2q(frame_aspect_ratio*frame_height/frame_width, 255);
        video_enc->pix_fmt = frame_pix_fmt;

        if(codec && codec->pix_fmts){
            const enum PixelFormat *p= codec->pix_fmts;
            for(; *p!=-1; p++){
                if(*p == video_enc->pix_fmt)
                    break;
            }
            if(*p == -1)
                video_enc->pix_fmt = codec->pix_fmts[0];
        }

        if (!intra_only)
            video_enc->gop_size = gop_size;
        else
            video_enc->gop_size = 0;
        if (video_qscale || same_quality) {
            video_enc->flags |= CODEC_FLAG_QSCALE;
            video_enc->global_quality= 
                st->quality = FF_QP2LAMBDA * video_qscale;
        }

        if(intra_matrix)
            video_enc->intra_matrix = intra_matrix;
        if(inter_matrix)
            video_enc->inter_matrix = inter_matrix;

        if(bitexact)
            video_enc->flags |= CODEC_FLAG_BITEXACT;

        video_enc->mb_decision = mb_decision;
        video_enc->mb_cmp = mb_cmp;
        video_enc->ildct_cmp = ildct_cmp;
        video_enc->me_sub_cmp = sub_cmp;
        video_enc->me_cmp = cmp;
        video_enc->me_pre_cmp = pre_cmp;
        video_enc->pre_me = pre_me;
        video_enc->lumi_masking = lumi_mask;
        video_enc->dark_masking = dark_mask;
        video_enc->spatial_cplx_masking = scplx_mask;
        video_enc->temporal_cplx_masking = tcplx_mask;
        video_enc->p_masking = p_mask;
        video_enc->quantizer_noise_shaping= qns;
                
        if (use_umv) {
            video_enc->flags |= CODEC_FLAG_H263P_UMV;
        }
        if (use_ss) {
            video_enc->flags |= CODEC_FLAG_H263P_SLICE_STRUCT;
        }
        if (use_aic) {
            video_enc->flags |= CODEC_FLAG_H263P_AIC;
        }
        if (use_aiv) {
            video_enc->flags |= CODEC_FLAG_H263P_AIV;
        }
        if (use_4mv) {
            video_enc->flags |= CODEC_FLAG_4MV;
        }
        if (use_obmc) {
            video_enc->flags |= CODEC_FLAG_OBMC;
        }
        if (use_loop) {
            video_enc->flags |= CODEC_FLAG_LOOP_FILTER;
        }
            
        if(use_part) {
            video_enc->flags |= CODEC_FLAG_PART;
        }
        if (use_alt_scan) {
            video_enc->flags |= CODEC_FLAG_ALT_SCAN;
        }
        if (use_trell) {
            video_enc->flags |= CODEC_FLAG_TRELLIS_QUANT;
        }
        if (use_mv0) {
            video_enc->flags |= CODEC_FLAG_MV0;
        }
        if (do_normalize_aqp) {
            video_enc->flags |= CODEC_FLAG_NORMALIZE_AQP;
        }
        if (use_scan_offset) {
            video_enc->flags |= CODEC_FLAG_SVCD_SCAN_OFFSET;
        }
        if (closed_gop) {
            video_enc->flags |= CODEC_FLAG_CLOSED_GOP;
        }
        if (strict_gop) {
            video_enc->flags2 |= CODEC_FLAG2_STRICT_GOP;
        }
        if (use_qpel) {
            video_enc->flags |= CODEC_FLAG_QPEL;
        }
        if (use_qprd) {
            video_enc->flags |= CODEC_FLAG_QP_RD;
        }
        if (use_cbprd) {
            video_enc->flags |= CODEC_FLAG_CBP_RD;
        }
        if (b_frames) {
            video_enc->max_b_frames = b_frames;
            video_enc->b_frame_strategy = b_strategy;
            video_enc->b_quant_factor = 2.0;
        }
        if (do_interlace_dct) {
            video_enc->flags |= CODEC_FLAG_INTERLACED_DCT;
        }
        if (do_interlace_me) {
            video_enc->flags |= CODEC_FLAG_INTERLACED_ME;
        }
        if (no_output) {
            video_enc->flags2 |= CODEC_FLAG2_NO_OUTPUT;
        }
        if (gray_only) {
            video_enc->flags |= CODEC_FLAG_GRAY;
        }
        video_enc->qmin = video_qmin;
        video_enc->qmax = video_qmax;
        video_enc->lmin = video_lmin;
        video_enc->lmax = video_lmax;
        video_enc->rc_qsquish = video_qsquish;
        video_enc->luma_elim_threshold = video_lelim;
        video_enc->chroma_elim_threshold = video_celim;
        video_enc->mb_lmin = video_mb_lmin;
        video_enc->mb_lmax = video_mb_lmax;
        video_enc->max_qdiff = video_qdiff;
        video_enc->qblur = video_qblur;
        video_enc->qcompress = video_qcomp;
        video_enc->rc_eq = video_rc_eq;
        video_enc->debug = debug;
        video_enc->debug_mv = debug_mv;
        video_enc->workaround_bugs = workaround_bugs;
        video_enc->thread_count = thread_count;
        p= video_rc_override_string;
        for(i=0; p; i++){
            int start, end, q;
            int e=sscanf(p, "%d,%d,%d", &start, &end, &q);
            if(e!=3){
                fprintf(stderr, "error parsing rc_override\n");
                exit(1);
            }
            video_enc->rc_override= 
                av_realloc(video_enc->rc_override, 
                           sizeof(RcOverride)*(i+1));
            video_enc->rc_override[i].start_frame= start;
            video_enc->rc_override[i].end_frame  = end;
            if(q>0){
                video_enc->rc_override[i].qscale= q;
                video_enc->rc_override[i].quality_factor= 1.0;
            }
            else{
                video_enc->rc_override[i].qscale= 0;
                video_enc->rc_override[i].quality_factor= -q/100.0;
            }
            p= strchr(p, '/');
            if(p) p++;
        }
        video_enc->rc_override_count=i;

        video_enc->rc_max_rate = video_rc_max_rate;
        video_enc->rc_min_rate = video_rc_min_rate;
        video_enc->rc_buffer_size = video_rc_buffer_size;
        video_enc->rc_initial_buffer_occupancy = video_rc_buffer_size*3/4;
        video_enc->rc_buffer_aggressivity= video_rc_buffer_aggressivity;
        video_enc->rc_initial_cplx= video_rc_initial_cplx;
        video_enc->i_quant_factor = video_i_qfactor;
        video_enc->b_quant_factor = video_b_qfactor;
        video_enc->i_quant_offset = video_i_qoffset;
        video_enc->b_quant_offset = video_b_qoffset;
        video_enc->intra_quant_bias = video_intra_quant_bias;
        video_enc->inter_quant_bias = video_inter_quant_bias;
        video_enc->dct_algo = dct_algo;
        video_enc->idct_algo = idct_algo;
        video_enc->me_threshold= me_threshold;
        video_enc->mb_threshold= mb_threshold;
        video_enc->intra_dc_precision= intra_dc_precision - 8;
        video_enc->strict_std_compliance = strict;
        video_enc->error_rate = error_rate;
        video_enc->noise_reduction= noise_reduction;
        video_enc->scenechange_threshold= sc_threshold;
        video_enc->me_range = me_range;
        video_enc->coder_type= coder;
        video_enc->context_model= context;
        video_enc->prediction_method= predictor;
        video_enc->profile= video_profile;
        video_enc->level= video_level;
        video_enc->nsse_weight= nsse_weight;
        video_enc->me_subpel_quality= subpel_quality;
        video_enc->me_penalty_compensation= me_penalty_compensation;
        video_enc->frame_skip_threshold= frame_skip_threshold;
        video_enc->frame_skip_factor= frame_skip_factor;
        video_enc->frame_skip_exp= frame_skip_exp;
        video_enc->frame_skip_cmp= frame_skip_cmp;

        if(packet_size){
            video_enc->rtp_mode= 1;
            video_enc->rtp_payload_size= packet_size;
        }
            
        if (do_psnr)
            video_enc->flags|= CODEC_FLAG_PSNR;
            
        video_enc->me_method = me_method;

        /* two pass mode */
        if (do_pass) {
            if (do_pass == 1) {
                video_enc->flags |= CODEC_FLAG_PASS1;
            } else {
                video_enc->flags |= CODEC_FLAG_PASS2;
            }
        }
    }

    /* reset some key parameters */
    video_disable = 0;
    video_codec_id = CODEC_ID_NONE;
    video_stream_copy = 0;
}

static void new_audio_stream(AVFormatContext *oc)
{
    AVStream *st;
    AVCodecContext *audio_enc;
    int codec_id;
            
    st = av_new_stream(oc, oc->nb_streams);
    if (!st) {
        fprintf(stderr, "Could not alloc stream\n");
        exit(1);
    }
#if defined(HAVE_THREADS)
    if(thread_count>1)
        avcodec_thread_init(st->codec, thread_count);
#endif
    
    audio_enc = st->codec;
    audio_enc->codec_type = CODEC_TYPE_AUDIO;
    
    if(audio_codec_tag)
        audio_enc->codec_tag= audio_codec_tag;
    
    if (oc->oformat->flags & AVFMT_GLOBALHEADER) 
        audio_enc->flags |= CODEC_FLAG_GLOBAL_HEADER;
    if (audio_stream_copy) {
        st->stream_copy = 1;
        audio_enc->channels = audio_channels;
    } else {
        codec_id = av_guess_codec(oc->oformat, NULL, oc->filename, NULL, CODEC_TYPE_AUDIO);
        if (audio_codec_id != CODEC_ID_NONE)
            codec_id = audio_codec_id;
        audio_enc->codec_id = codec_id;
        
        audio_enc->bit_rate = audio_bit_rate;
        audio_enc->strict_std_compliance = strict;
        audio_enc->thread_count = thread_count;
        /* For audio codecs other than AC3 or DTS we limit */
        /* the number of coded channels to stereo   */
        if (audio_channels > 2 && codec_id != CODEC_ID_AC3
            && codec_id != CODEC_ID_DTS) {
            audio_enc->channels = 2;
        } else
            audio_enc->channels = audio_channels;
    }
    audio_enc->sample_rate = audio_sample_rate;
    if (audio_language) {
        pstrcpy(st->language, sizeof(st->language), audio_language);
        av_free(audio_language);
        audio_language = NULL;
    }

    /* reset some key parameters */
    audio_disable = 0;
    audio_codec_id = CODEC_ID_NONE;
    audio_stream_copy = 0;
}

static void opt_new_subtitle_stream(void)
{
    AVFormatContext *oc;
    AVStream *st;
    AVCodecContext *subtitle_enc;
            
    if (nb_output_files <= 0) {
        fprintf(stderr, "At least one output file must be specified\n");
        exit(1);
    }
    oc = output_files[nb_output_files - 1];

    st = av_new_stream(oc, oc->nb_streams);
    if (!st) {
        fprintf(stderr, "Could not alloc stream\n");
        exit(1);
    }

    subtitle_enc = st->codec;
    subtitle_enc->codec_type = CODEC_TYPE_SUBTITLE;
    if (subtitle_stream_copy) {
        st->stream_copy = 1;
    } else {
        subtitle_enc->codec_id = subtitle_codec_id;
    }

    if (subtitle_language) {
        pstrcpy(st->language, sizeof(st->language), subtitle_language);
        av_free(subtitle_language);
        subtitle_language = NULL;
    }

    subtitle_codec_id = CODEC_ID_NONE;
    subtitle_stream_copy = 0;
}

static void opt_new_audio_stream(void)
{
    AVFormatContext *oc;
    if (nb_output_files <= 0) {
        fprintf(stderr, "At least one output file must be specified\n");
        exit(1);
    }
    oc = output_files[nb_output_files - 1];
    new_audio_stream(oc);
}

static void opt_new_video_stream(void)
{
    AVFormatContext *oc;
    if (nb_output_files <= 0) {
        fprintf(stderr, "At least one output file must be specified\n");
        exit(1);
    }
    oc = output_files[nb_output_files - 1];
    new_video_stream(oc);
}

static void opt_output_file(const char *filename)
{
    AVFormatContext *oc;
    int use_video, use_audio, input_has_video, input_has_audio;
    AVFormatParameters params, *ap = &params;

    if (!strcmp(filename, "-"))
        filename = "pipe:";

    oc = av_alloc_format_context();

    if (!file_oformat) {
        file_oformat = guess_format(NULL, filename, NULL);
        if (!file_oformat) {
            fprintf(stderr, "Unable for find a suitable output format for '%s'\n",
                    filename);
            exit(1);
        }
    }
    
    oc->oformat = file_oformat;
    pstrcpy(oc->filename, sizeof(oc->filename), filename);

    if (!strcmp(file_oformat->name, "ffm") && 
        strstart(filename, "http:", NULL)) {
        /* special case for files sent to ffserver: we get the stream
           parameters from ffserver */
        if (read_ffserver_streams(oc, filename) < 0) {
            fprintf(stderr, "Could not read stream parameters from '%s'\n", filename);
            exit(1);
        }
    } else {
        use_video = file_oformat->video_codec != CODEC_ID_NONE || video_stream_copy || video_codec_id != CODEC_ID_NONE;
        use_audio = file_oformat->audio_codec != CODEC_ID_NONE || audio_stream_copy || audio_codec_id != CODEC_ID_NONE;

        /* disable if no corresponding type found and at least one
           input file */
        if (nb_input_files > 0) {
            check_audio_video_inputs(&input_has_video, &input_has_audio);
            if (!input_has_video)
                use_video = 0;
            if (!input_has_audio)
                use_audio = 0;
        }

        /* manual disable */
        if (audio_disable) {
            use_audio = 0;
        }
        if (video_disable) {
            use_video = 0;
        }
        
        if (use_video) {
            new_video_stream(oc);
        }
    
        if (use_audio) {
            new_audio_stream(oc);
        }

        if (!oc->nb_streams) {
            fprintf(stderr, "No audio or video streams available\n");
            exit(1);
        }

        oc->timestamp = rec_timestamp;
	    
	if (str_title)
            pstrcpy(oc->title, sizeof(oc->title), str_title);
        if (str_author)
            pstrcpy(oc->author, sizeof(oc->author), str_author);
        if (str_copyright)
            pstrcpy(oc->copyright, sizeof(oc->copyright), str_copyright);
        if (str_comment)
            pstrcpy(oc->comment, sizeof(oc->comment), str_comment);
    }

    output_files[nb_output_files++] = oc;

    /* check filename in case of an image number is expected */
    if (oc->oformat->flags & AVFMT_NEEDNUMBER) {
        if (filename_number_test(oc->filename) < 0) {
            print_error(oc->filename, AVERROR_NUMEXPECTED);
            exit(1);
        }
    }

    if (!(oc->oformat->flags & AVFMT_NOFILE)) {
        /* test if it already exists to avoid loosing precious files */
        if (!file_overwrite && 
            (strchr(filename, ':') == NULL ||
             strstart(filename, "file:", NULL))) {
            if (url_exist(filename)) {
                int c;
                
                if ( !using_stdin ) {
                    fprintf(stderr,"File '%s' already exists. Overwrite ? [y/N] ", filename);
                    fflush(stderr);
                    c = getchar();
                    if (toupper(c) != 'Y') {
                        fprintf(stderr, "Not overwriting - exiting\n");
                        exit(1);
                    }
				}
				else {
                    fprintf(stderr,"File '%s' already exists. Exiting.\n", filename);
                    exit(1);
				}
            }
        }
        
        /* open the file */
        if (url_fopen(&oc->pb, filename, URL_WRONLY) < 0) {
            fprintf(stderr, "Could not open '%s'\n", filename);
            exit(1);
        }
    }

    memset(ap, 0, sizeof(*ap));
    ap->image_format = image_format;
    if (av_set_parameters(oc, ap) < 0) {
        fprintf(stderr, "%s: Invalid encoding parameters\n",
                oc->filename);
        exit(1);
    }

    oc->packet_size= mux_packet_size;
    oc->mux_rate= mux_rate;
    oc->preload= (int)(mux_preload*AV_TIME_BASE);
    oc->max_delay= (int)(mux_max_delay*AV_TIME_BASE);
    oc->loop_output = loop_output;

    /* reset some options */
    file_oformat = NULL;
    file_iformat = NULL;
    image_format = NULL;
}

/* prepare dummy protocols for grab */
static void prepare_grab(void)
{
    int has_video, has_audio, i, j;
    AVFormatContext *oc;
    AVFormatContext *ic;
    AVFormatParameters vp1, *vp = &vp1;
    AVFormatParameters ap1, *ap = &ap1;
    
    /* see if audio/video inputs are needed */
    has_video = 0;
    has_audio = 0;
    memset(ap, 0, sizeof(*ap));
    memset(vp, 0, sizeof(*vp));
    vp->time_base.num= 1;
    for(j=0;j<nb_output_files;j++) {
        oc = output_files[j];
        for(i=0;i<oc->nb_streams;i++) {
            AVCodecContext *enc = oc->streams[i]->codec;
            switch(enc->codec_type) {
            case CODEC_TYPE_AUDIO:
                if (enc->sample_rate > ap->sample_rate)
                    ap->sample_rate = enc->sample_rate;
                if (enc->channels > ap->channels)
                    ap->channels = enc->channels;
                has_audio = 1;
                break;
            case CODEC_TYPE_VIDEO:
                if (enc->width > vp->width)
                    vp->width = enc->width;
                if (enc->height > vp->height)
                    vp->height = enc->height;
                
                if (vp->time_base.num*(int64_t)enc->time_base.den > enc->time_base.num*(int64_t)vp->time_base.den){
                    vp->time_base = enc->time_base;
                }
                has_video = 1;
                break;
            default:
                av_abort();
            }
        }
    }
    
    if (has_video == 0 && has_audio == 0) {
        fprintf(stderr, "Output file must have at least one audio or video stream\n");
        exit(1);
    }
    
    if (has_video) {
        AVInputFormat *fmt1;
        fmt1 = av_find_input_format(video_grab_format);
        vp->device  = video_device;
        vp->channel = video_channel;
	vp->standard = video_standard;
        if (av_open_input_file(&ic, "", fmt1, 0, vp) < 0) {
            fprintf(stderr, "Could not find video grab device\n");
            exit(1);
        }
        /* If not enough info to get the stream parameters, we decode the
           first frames to get it. */
	if ((ic->ctx_flags & AVFMTCTX_NOHEADER) && av_find_stream_info(ic) < 0) {
            fprintf(stderr, "Could not find video grab parameters\n");
            exit(1);
        }
        /* by now video grab has one stream */
        ic->streams[0]->r_frame_rate.num = vp->time_base.den;
        ic->streams[0]->r_frame_rate.den = vp->time_base.num;
        input_files[nb_input_files] = ic;

        if (verbose >= 0)
            dump_format(ic, nb_input_files, "", 0);

        nb_input_files++;
    }
    if (has_audio && audio_grab_format) {
        AVInputFormat *fmt1;
        fmt1 = av_find_input_format(audio_grab_format);
        ap->device = audio_device;
        if (av_open_input_file(&ic, "", fmt1, 0, ap) < 0) {
            fprintf(stderr, "Could not find audio grab device\n");
            exit(1);
        }
        input_files[nb_input_files] = ic;

        if (verbose >= 0)
            dump_format(ic, nb_input_files, "", 0);

        nb_input_files++;
    }
}

/* same option as mencoder */
static void opt_pass(const char *pass_str)
{
    int pass;
    pass = atoi(pass_str);
    if (pass != 1 && pass != 2) {
        fprintf(stderr, "pass number can be only 1 or 2\n");
        exit(1);
    }
    do_pass = pass;
}

#if defined(CONFIG_WIN32) || defined(CONFIG_OS2)
static int64_t getutime(void)
{
  return av_gettime();
}
#else
static int64_t getutime(void)
{
    struct rusage rusage;

    getrusage(RUSAGE_SELF, &rusage);
    return (rusage.ru_utime.tv_sec * 1000000LL) + rusage.ru_utime.tv_usec;
}
#endif

extern int ffm_nopts;

static void opt_bitexact(void)
{
    bitexact=1;
    /* disable generate of real time pts in ffm (need to be supressed anyway) */
    ffm_nopts = 1;
}

static void show_formats(void)
{
    AVInputFormat *ifmt;
    AVOutputFormat *ofmt;
    AVImageFormat *image_fmt;
    URLProtocol *up;
    AVCodec *p, *p2;
    const char **pp, *last_name;

    printf("File formats:\n");
    last_name= "000";
    for(;;){
        int decode=0;
        int encode=0;
        const char *name=NULL;
        const char *long_name=NULL;

        for(ofmt = first_oformat; ofmt != NULL; ofmt = ofmt->next) {
            if((name == NULL || strcmp(ofmt->name, name)<0) &&
                strcmp(ofmt->name, last_name)>0){
                name= ofmt->name;
                long_name= ofmt->long_name;
                encode=1;
            }
        }
        for(ifmt = first_iformat; ifmt != NULL; ifmt = ifmt->next) {
            if((name == NULL || strcmp(ifmt->name, name)<0) &&
                strcmp(ifmt->name, last_name)>0){
                name= ifmt->name;
                long_name= ifmt->long_name;
                encode=0;
            }
            if(name && strcmp(ifmt->name, name)==0)
                decode=1;
        }
        if(name==NULL)
            break;
        last_name= name;
        
        printf(
            " %s%s %-15s %s\n", 
            decode ? "D":" ", 
            encode ? "E":" ", 
            name,
            long_name ? long_name:" ");
    }
    printf("\n");

    printf("Image formats (filename extensions, if any, follow):\n");
    for(image_fmt = first_image_format; image_fmt != NULL; 
        image_fmt = image_fmt->next) {
        printf(
            " %s%s %-6s %s\n",
            image_fmt->img_read  ? "D":" ",
            image_fmt->img_write ? "E":" ",
            image_fmt->name,
            image_fmt->extensions ? image_fmt->extensions:" ");
    }
    printf("\n");

    printf("Codecs:\n");
    last_name= "000";
    for(;;){
        int decode=0;
        int encode=0;
        int cap=0;
        const char *type_str;

        p2=NULL;
        for(p = first_avcodec; p != NULL; p = p->next) {
            if((p2==NULL || strcmp(p->name, p2->name)<0) &&
                strcmp(p->name, last_name)>0){
                p2= p;
                decode= encode= cap=0;
            }
            if(p2 && strcmp(p->name, p2->name)==0){
                if(p->decode) decode=1;
                if(p->encode) encode=1;
                cap |= p->capabilities;
            }
        }
        if(p2==NULL)
            break;
        last_name= p2->name;
        
        switch(p2->type) {
        case CODEC_TYPE_VIDEO:
            type_str = "V";
            break;
        case CODEC_TYPE_AUDIO:
            type_str = "A";
            break;
        case CODEC_TYPE_SUBTITLE:
            type_str = "S";
            break;
        default:
            type_str = "?";
            break;
        }
        printf(
            " %s%s%s%s%s%s %s", 
            decode ? "D": (/*p2->decoder ? "d":*/" "), 
            encode ? "E":" ", 
            type_str,
            cap & CODEC_CAP_DRAW_HORIZ_BAND ? "S":" ",
            cap & CODEC_CAP_DR1 ? "D":" ",
            cap & CODEC_CAP_TRUNCATED ? "T":" ",
            p2->name);
       /* if(p2->decoder && decode==0)
            printf(" use %s for decoding", p2->decoder->name);*/
        printf("\n");
    }
    printf("\n");

    printf("Supported file protocols:\n");
    for(up = first_protocol; up != NULL; up = up->next)
        printf(" %s:", up->name);
    printf("\n");
    
    printf("Frame size, frame rate abbreviations:\n ntsc pal qntsc qpal sntsc spal film ntsc-film sqcif qcif cif 4cif\n");
    printf("Motion estimation methods:\n");
    pp = motion_str;
    while (*pp) {
        printf(" %s", *pp);
        if ((pp - motion_str + 1) == ME_ZERO) 
            printf("(fastest)");
        else if ((pp - motion_str + 1) == ME_FULL) 
            printf("(slowest)");
        else if ((pp - motion_str + 1) == ME_EPZS) 
            printf("(default)");
        pp++;
    }
    printf("\n\n");
    printf(
"Note, the names of encoders and decoders dont always match, so there are\n"
"several cases where the above table shows encoder only or decoder only entries\n"
"even though both encoding and decoding are supported for example, the h263\n"
"decoder corresponds to the h263 and h263p encoders, for file formats its even\n"
"worse\n");
    exit(1);
}

void parse_matrix_coeffs(uint16_t *dest, const char *str)
{
    int i;
    const char *p = str;
    for(i = 0;; i++) {
        dest[i] = atoi(p);
        if(i == 63)