ffmpeg.c

                        ost->audio_resample = 1; 
                        ost->resample = audio_resample_init(codec->channels, icodec->channels,
                                                        codec->sample_rate, 
                                                        icodec->sample_rate);
			if(!ost->resample)
			  {
			    printf("Can't resample.  Aborting.\n");
			    av_abort();
			  }
                    }
                }
                ist->decoding_needed = 1;
                ost->encoding_needed = 1;
                break;
            case CODEC_TYPE_VIDEO:
                if (codec->width == icodec->width &&
                    codec->height == icodec->height &&
                    frame_topBand == 0 &&
                    frame_bottomBand == 0 &&
                    frame_leftBand == 0 &&
                    frame_rightBand == 0)
                {
                    ost->video_resample = 0;
                    ost->video_crop = 0;
                } else if ((codec->width == icodec->width -
                                (frame_leftBand + frame_rightBand)) &&
                        (codec->height == icodec->height -
                                (frame_topBand  + frame_bottomBand)))
                {
                    ost->video_resample = 0;
                    ost->video_crop = 1;
                    ost->topBand = frame_topBand;
                    ost->leftBand = frame_leftBand;
                } else {
                    uint8_t *buf;
                    ost->video_resample = 1;
                    ost->video_crop = 0; // cropping is handled as part of resample
                    buf = av_malloc((codec->width * codec->height * 3) / 2);
                    if (!buf)
                        goto fail;
                    ost->pict_tmp.data[0] = buf;
                    ost->pict_tmp.data[1] = ost->pict_tmp.data[0] + (codec->width * codec->height);
                    ost->pict_tmp.data[2] = ost->pict_tmp.data[1] + (codec->width * codec->height) / 4;
                    ost->pict_tmp.linesize[0] = codec->width;
                    ost->pict_tmp.linesize[1] = codec->width / 2;
                    ost->pict_tmp.linesize[2] = codec->width / 2;

                    ost->img_resample_ctx = img_resample_full_init( 
                                      ost->st->codec.width, ost->st->codec.height,
                                      ist->st->codec.width, ist->st->codec.height,
                                      frame_topBand, frame_bottomBand,
                                      frame_leftBand, frame_rightBand);
                }
                ost->encoding_needed = 1;
                ist->decoding_needed = 1;
                break;
            default:
                av_abort();
            }
            /* two pass mode */
            if (ost->encoding_needed && 
                (codec->flags & (CODEC_FLAG_PASS1 | CODEC_FLAG_PASS2))) {
                char logfilename[1024];
                FILE *f;
                int size;
                char *logbuffer;
                
                snprintf(logfilename, sizeof(logfilename), "%s-%d.log", 
                         pass_logfilename ? 
                         pass_logfilename : DEFAULT_PASS_LOGFILENAME, i);
                if (codec->flags & CODEC_FLAG_PASS1) {
                    f = fopen(logfilename, "w");
                    if (!f) {
                        perror(logfilename);
                        exit(1);
                    }
                    ost->logfile = f;
                } else {
                    /* read the log file */
                    f = fopen(logfilename, "r");
                    if (!f) {
                        perror(logfilename);
                        exit(1);
                    }
                    fseek(f, 0, SEEK_END);
                    size = ftell(f);
                    fseek(f, 0, SEEK_SET);
                    logbuffer = av_malloc(size + 1);
                    if (!logbuffer) {
                        fprintf(stderr, "Could not allocate log buffer\n");
                        exit(1);
                    }
                    fread(logbuffer, 1, size, f);
                    fclose(f);
                    logbuffer[size] = '\0';
                    codec->stats_in = logbuffer;
                }
            }
        }
    }

    /* dump the file output parameters - cannot be done before in case
       of stream copy */
    for(i=0;i<nb_output_files;i++) {
        dump_format(output_files[i], i, output_files[i]->filename, 1);
    }

    /* dump the stream mapping */
    fprintf(stderr, "Stream mapping:\n");
    for(i=0;i<nb_ostreams;i++) {
        ost = ost_table[i];
        fprintf(stderr, "  Stream #%d.%d -> #%d.%d\n",
                ist_table[ost->source_index]->file_index,
                ist_table[ost->source_index]->index,
                ost->file_index, 
                ost->index);
    }

    /* open each encoder */
    for(i=0;i<nb_ostreams;i++) {
        ost = ost_table[i];
        if (ost->encoding_needed) {
            AVCodec *codec;
            codec = avcodec_find_encoder(ost->st->codec.codec_id);
            if (!codec) {
                fprintf(stderr, "Unsupported codec for output stream #%d.%d\n", 
                        ost->file_index, ost->index);
                exit(1);
            }
            if (avcodec_open(&ost->st->codec, codec) < 0) {
                fprintf(stderr, "Error while opening codec for stream #%d.%d - maybe incorrect parameters such as bit_rate, rate, width or height\n", 
                        ost->file_index, ost->index);
                exit(1);
            }
        }
    }

    /* open each decoder */
    for(i=0;i<nb_istreams;i++) {
        ist = ist_table[i];
        if (ist->decoding_needed) {
            AVCodec *codec;
            codec = avcodec_find_decoder(ist->st->codec.codec_id);
            if (!codec) {
                fprintf(stderr, "Unsupported codec (id=%d) for input stream #%d.%d\n", 
                        ist->st->codec.codec_id, ist->file_index, ist->index);
                exit(1);
            }
            if (avcodec_open(&ist->st->codec, codec) < 0) {
                fprintf(stderr, "Error while opening codec for input stream #%d.%d\n", 
                        ist->file_index, ist->index);
                exit(1);
            }
            //if (ist->st->codec.codec_type == CODEC_TYPE_VIDEO)
            //    ist->st->codec.flags |= CODEC_FLAG_REPEAT_FIELD;
        }
    }

    /* init pts */
    for(i=0;i<nb_istreams;i++) {
        ist = ist_table[i];
	is = input_files[ist->file_index];
        ist->pts = 0;
        ist->next_pts = 0;
    }
    
    /* compute buffer size max (should use a complete heuristic) */
    for(i=0;i<nb_input_files;i++) {
        file_table[i].buffer_size_max = 2048;
    }

    /* open files and write file headers */
    for(i=0;i<nb_output_files;i++) {
        os = output_files[i];
        if (av_write_header(os) < 0) {
            fprintf(stderr, "Could not write header for output file #%d (incorrect codec paramters ?)\n", i);
            ret = -EINVAL;
            goto fail;
        }
    }

#ifndef CONFIG_WIN32
    if ( !using_stdin )
        fprintf(stderr, "Press [q] to stop encoding\n");
#endif
    term_init();

    stream_no_data = 0;
    key = -1;

    for(; received_sigterm == 0;) {
        int file_index, ist_index;
        AVPacket pkt;
        uint8_t *ptr;
        int len;
        uint8_t *data_buf;
        int data_size, got_picture;
        AVFrame picture;
        short samples[AVCODEC_MAX_AUDIO_FRAME_SIZE / 2];
        void *buffer_to_free;
        double pts_min;
        
    redo:
        /* if 'q' pressed, exits */
        if (!using_stdin) {
            /* read_key() returns 0 on EOF */
            key = read_key();
            if (key == 'q')
                break;
        }

        /* select the stream that we must read now by looking at the
           smallest output pts */
        file_index = -1;
        pts_min = 1e10;
        for(i=0;i<nb_ostreams;i++) {
            double pts;
            ost = ost_table[i];
            os = output_files[ost->file_index];
            ist = ist_table[ost->source_index];
            pts = (double)ost->st->pts.val * os->pts_num / os->pts_den;
            if (!file_table[ist->file_index].eof_reached && 
                pts < pts_min) {
                pts_min = pts;
                file_index = ist->file_index;
            }
        }
        /* if none, if is finished */
        if (file_index < 0) {
            break;
        }

        /* finish if recording time exhausted */
        if (recording_time > 0 && pts_min >= (recording_time / 1000000.0))
            break;

        /* read a frame from it and output it in the fifo */
        is = input_files[file_index];
        if (av_read_frame(is, &pkt) < 0) {
            file_table[file_index].eof_reached = 1;
            continue;
        }
        if (!pkt.size) {
            stream_no_data = is;
        } else {
            stream_no_data = 0;
        }
        if (do_pkt_dump) {
            av_pkt_dump(stdout, &pkt, do_hex_dump);
        }
        /* the following test is needed in case new streams appear
           dynamically in stream : we ignore them */
        if (pkt.stream_index >= file_table[file_index].nb_streams)
            goto discard_packet;
        ist_index = file_table[file_index].ist_index + pkt.stream_index;
        ist = ist_table[ist_index];
        if (ist->discard)
            goto discard_packet;

        //fprintf(stderr,"read #%d.%d size=%d\n", ist->file_index, ist->index, pkt.size);
        
        if (pkt.pts != AV_NOPTS_VALUE) {
            ist->pts = pkt.pts;
        } else {
            ist->pts = ist->next_pts;
        }

        len = pkt.size;
        ptr = pkt.data;
        while (len > 0) {
            /* decode the packet if needed */
            data_buf = NULL; /* fail safe */
            data_size = 0;
            if (ist->decoding_needed) {
                switch(ist->st->codec.codec_type) {
                case CODEC_TYPE_AUDIO:
                    /* XXX: could avoid copy if PCM 16 bits with same
                       endianness as CPU */
                    ret = avcodec_decode_audio(&ist->st->codec, samples, &data_size,
                                               ptr, len);
                    if (ret < 0)
                        goto fail_decode;
                    ptr += ret;
                    len -= ret;
                    /* Some bug in mpeg audio decoder gives */
                    /* data_size < 0, it seems they are overflows */
                    if (data_size <= 0) {
                        /* no audio frame */
                        continue;
                    }
                    data_buf = (uint8_t *)samples;
                    ist->next_pts += ((int64_t)AV_TIME_BASE * data_size) / 
                        (2 * ist->st->codec.channels);
                    break;
                case CODEC_TYPE_VIDEO:
                    data_size = (ist->st->codec.width * ist->st->codec.height * 3) / 2;
                    /* XXX: allocate picture correctly */
                    memset(&picture, 0, sizeof(picture));
                    ret = avcodec_decode_video(&ist->st->codec, 
                                               &picture, &got_picture, ptr, len);
                    ist->st->quality= picture.quality;
                    if (ret < 0) {
                    fail_decode:
                        fprintf(stderr, "Error while decoding stream #%d.%d\n",
                                ist->file_index, ist->index);
                        av_free_packet(&pkt);
                        goto redo;
                    }
                    if (!got_picture) {
                        /* no picture yet */
                        goto discard_packet;
                    }
                    if (ist->st->codec.frame_rate_base != 0) {
                        ist->next_pts += ((int64_t)AV_TIME_BASE * 
                                          ist->st->codec.frame_rate_base) /
                            ist->st->codec.frame_rate;
                    }
                    len = 0;
                    break;
                default:
                    goto fail_decode;
                }
            } else {
                data_buf = ptr;
                data_size = len;
                ret = len;
                len = 0;
            }

            buffer_to_free = NULL;
            if (ist->st->codec.codec_type == CODEC_TYPE_VIDEO) {
                pre_process_video_frame(ist, (AVPicture *)&picture, 
                                        &buffer_to_free);
            }

            /* frame rate emulation */
            if (ist->st->codec.rate_emu) {
                int64_t pts = av_rescale((int64_t) ist->frame * ist->st->codec.frame_rate_base, 1000000, ist->st->codec.frame_rate);
                int64_t now = av_gettime() - ist->start;
                if (pts > now)
                    usleep(pts - now);

                ist->frame++;
            }

#if 0
            /* mpeg PTS deordering : if it is a P or I frame, the PTS
               is the one of the next displayed one */
            /* XXX: add mpeg4 too ? */
            if (ist->st->codec.codec_id == CODEC_ID_MPEG1VIDEO) {
                if (ist->st->codec.pict_type != B_TYPE) {
                    int64_t tmp;
                    tmp = ist->last_ip_pts;
                    ist->last_ip_pts  = ist->frac_pts.val;
                    ist->frac_pts.val = tmp;
                }
            }
#endif
            /* if output time reached then transcode raw format, 
	       encode packets and output them */
            if (start_time == 0 || ist->pts >= start_time)
                for(i=0;i<nb_ostreams;i++) {
                    int frame_size;

                    ost = ost_table[i];
                    if (ost->source_index == ist_index) {
                        os = output_files[ost->file_index];

#if 0
                        printf("%d: got pts=%0.3f %0.3f\n", i, 
                               (double)pkt.pts / AV_TIME_BASE, 
                               ((double)ist->pts / AV_TIME_BASE) - 
                               ((double)ost->st->pts.val * os->pts_num / os->pts_den));
#endif
                        /* set the input output pts pairs */
                        ost->sync_ipts = (double)ist->pts / AV_TIME_BASE;
                        /* XXX: take into account the various fifos,
                           in particular for audio */
                        ost->sync_opts = ost->st->pts.val;
                        //printf("ipts=%lld sync_ipts=%f sync_opts=%lld pts.val=%lld pkt.pts=%lld\n", ist->pts, ost->sync_ipts, ost->sync_opts, ost->st->pts.val, pkt.pts); 

                        if (ost->encoding_needed) {
                            switch(ost->st->codec.codec_type) {
                            case CODEC_TYPE_AUDIO:
                                do_audio_out(os, ost, ist, data_buf, data_size);
                                break;
                            case CODEC_TYPE_VIDEO:
                                /* find an audio stream for synchro */
                                {
                                    int i;
                                    AVOutputStream *audio_sync, *ost1;
                                    audio_sync = NULL;
                                    for(i=0;i<nb_ostreams;i++) {
                                        ost1 = ost_table[i];
                                        if (ost1->file_index == ost->file_index &&
                                            ost1->st->codec.codec_type == CODEC_TYPE_AUDIO) {
                                            audio_sync = ost1;
                                            break;
                                        }
                                    }

                                    do_video_out(os, ost, ist, &picture, &frame_size, audio_sync);
                                    if (do_vstats && frame_size)
                                        do_video_stats(os, ost, frame_size);
                                }
                                break;
                            default:
                                av_abort();
                            }
                        } else {
                            AVFrame avframe;
                                                
                            /* no reencoding needed : output the packet directly */
                            /* force the input stream PTS */
                        
                            memset(&avframe, 0, sizeof(AVFrame));
                            ost->st->codec.coded_frame= &avframe;
                            avframe.key_frame = pkt.flags & PKT_FLAG_KEY; 
                        
                            av_write_frame(os, ost->index, data_buf, data_size);
                            ost->st->codec.frame_number++;
                            ost->frame_number++;
                        }
                    }
                }
            av_free(buffer_to_free);
        }
    discard_packet:
        av_free_packet(&pkt);
        
        /* dump report by using the output first video and audio streams */
        print_report(output_files, ost_table, nb_ostreams, 0);
    }
    term_exit();

    /* dump report by using the first video and audio streams */
    print_report(output_files, ost_table, nb_ostreams, 1);

    /* close each encoder */
    for(i=0;i<nb_ostreams;i++) {
        ost = ost_table[i];
        if (ost->encoding_needed) {
            av_freep(&ost->st->codec.stats_in);
            avcodec_close(&ost->st->codec);
        }
    }
    
    /* close each decoder */
    for(i=0;i<nb_istreams;i++) {
        ist = ist_table[i];
        if (ist->decoding_needed) {
            avcodec_close(&ist->st->codec);
        }
    }
    

    /* write the trailer if needed and close file */
    for(i=0;i<nb_output_files;i++) {
        os = output_files[i];
        av_write_trailer(os);
    }
    /* finished ! */
    
    ret = 0;
 fail1:
    av_free(file_table);

    if (ist_table) {
        for(i=0;i<nb_istreams;i++) {
            ist = ist_table[i];
            av_free(ist);
        }
        av_free(ist_table);
    }
    if (ost_table) {
        for(i=0;i<nb_ostreams;i++) {
            ost = ost_table[i];
            if (ost) {
                if (ost->logfile) {
                    fclose(ost->logfile);
                    ost->logfile = NULL;
                }
                fifo_free(&ost->fifo); /* works even if fifo is not
                                          initialized but set to zero */
                av_free(ost->pict_tmp.data[0]);
                if (ost->video_resample)
                    img_resample_close(ost->img_resample_ctx);
                if (ost->audio_resample)
                    audio_resample_close(ost->resample);
                av_free(ost);
            }
        }
        av_free(ost_table);
    }
    return ret;
 fail:
    ret = -ENOMEM;
    goto fail1;
}

#if 0
int file_read(const char *filename)
{
    URLContext *h;
    unsigned char buffer[1024];
    int len, i;

    if (url_open(&h, filename, O_RDONLY) < 0) {
        printf("could not open '%s'\n", filename);
        return -1;
    }
    for(;;) {
        len = url_read(h, buffer, sizeof(buffer));
        if (len <= 0)
            break;
        for(i=0;i<len;i++) putchar(buffer[i]);
    }
    url_close(h);
    return 0;
}
#endif

static void opt_image_format(const char *arg)
{
    AVImageFormat *f;
    
    for(f = first_image_format; f != NULL; f = f->next) {
        if (!strcmp(arg, f->name))
            break;
    }
    if (!f) {
        fprintf(stderr, "Unknown image format: '%s'\n", arg);
        exit(1);
    }
    image_format = f;
}

static void opt_format(const char *arg)
{
    /* compatibility stuff for pgmyuv */
    if (!strcmp(arg, "pgmyuv")) {
        opt_image_format(arg);
        arg = "image";
    }

    file_iformat = av_find_input_format(arg);
    file_oformat = guess_format(arg, NULL, NULL);
    if (!file_iformat && !file_oformat) {
        fprintf(stderr, "Unknown input or output format: %s\n", arg);
        exit(1);
    }
}

static void opt_video_bitrate(const char *arg)
{
    video_bit_rate = atoi(arg) * 1000;
}

static void opt_video_bitrate_tolerance(const char *arg)
{
    video_bit_rate_tolerance = atoi(arg) * 1000;
}

static void opt_video_bitrate_max(const char *arg)
{
    video_rc_max_rate = atoi(arg) * 1000;
}

static void opt_video_bitrate_min(const char *arg)
{
    video_rc_min_rate = atoi(arg) * 1000;
}

static void opt_video_buffer_size(const char *arg)
{
    video_rc_buffer_size = atoi(arg) * 1024;
}

static void opt_video_rc_eq(char *arg)
{
    video_rc_eq = arg;
}

static void opt_video_rc_override_string(char *arg)
{
    video_rc_override_string = arg;
}


static void opt_workaround_bugs(const char *arg)
{
    workaround_bugs = atoi(arg);
}

static void opt_dct_algo(const char *arg)
{
    dct_algo = atoi(arg);
}

static void opt_idct_algo(const char *arg)
{
    idct_algo = atoi(arg);
}


static void opt_error_resilience(const char *arg)
{
    error_resilience = atoi(arg);
}

static void opt_error_concealment(const char *arg)
{
    error_concealment = atoi(arg);
}

static void opt_debug(const char *arg)
{
    debug = atoi(arg);
}

static void opt_verbose(const char *arg)
{
    verbose = atoi(arg);
}

static void opt_frame_rate(const char *arg)
{
    if (parse_frame_rate(&frame_rate, &frame_rate_base, arg) < 0) {
        fprintf(stderr, "Incorrect frame rate\n");
	exit(1);
    }
}

static void opt_frame_crop_top(const char *arg)
{
    frame_topBand = atoi(arg); 
    if (frame_topBand < 0) {
        fprintf(stderr, "Incorrect top crop size\n");
        exit(1);
    }
    if ((frame_topBand % 2) != 0) {
        fprintf(stderr, "Top crop size must be a multiple of 2\n");
        exit(1);
    }
    if ((frame_topBand) >= frame_height){
    	fprintf(stderr, "Vertical crop dimensions are outside the range of the original image.\nRemember to crop first and scale second.\n");
        exit(1);
    }
    frame_height -= frame_topBand;
}

static void opt_frame_crop_bottom(const char *arg)
{
    frame_bottomBand = atoi(arg);
    if (frame_bottomBand < 0) {
        fprintf(stderr, "Incorrect bottom crop size\n");
        exit(1);
    }
    if ((frame_bottomBand % 2) != 0) {
        fprintf(stderr, "Bottom crop size must be a multiple of 2\n");
        exit(1);        
    }
    if ((frame_bottomBand) >= frame_height){
    	fprintf(stderr, "Vertical crop dimensions are outside the range of the original image.\nRemember to crop first and scale second.\n");
        exit(1);
    }
    frame_height -= frame_bottomBand;
}

static void opt_frame_crop_left(const char *arg)
{
    frame_leftBand = atoi(arg);
    if (frame_leftBand < 0) {
        fprintf(stderr, "Incorrect left crop size\n");
        exit(1);
    }
    if ((frame_leftBand % 2) != 0) {
        fprintf(stderr, "Left crop size must be a multiple of 2\n");
        exit(1);
    }
    if ((frame_leftBand) >= frame_width){
    	fprintf(stderr, "Horizontal crop dimensions are outside the range of the original image.\nRemember to crop first and scale second.\n");
        exit(1);
    }
    frame_width -= frame_leftBand;
}

static void opt_frame_crop_right(const char *arg)
{
    frame_rightBand = atoi(arg);
    if (frame_rightBand < 0) {
        fprintf(stderr, "Incorrect right crop size\n");
        exit(1);
    }
    if ((frame_rightBand % 2) != 0) {
        fprintf(stderr, "Right crop size must be a multiple of 2\n");
        exit(1);        
    }
    if ((frame_rightBand) >= frame_width){
    	fprintf(stderr, "Horizontal crop dimensions are outside the range of the original image.\nRemember to crop first and scale second.\n");
        exit(1);
    }
    frame_width -= frame_rightBand;
}

static void opt_frame_size(const char *arg)
{
    if (parse_image_size(&frame_width, &frame_height, arg) < 0) {
        fprintf(stderr, "Incorrect frame size\n");
        exit(1);
    }
    if ((frame_width % 2) != 0 || (frame_height % 2) != 0) {
        fprintf(stderr, "Frame size must be a multiple of 2\n");
        exit(1);
    }
}

static void opt_frame_pix_fmt(const char *arg)
{
    frame_pix_fmt = avcodec_get_pix_fmt(arg);
}

static void opt_frame_aspect_ratio(const char *arg)
{
    int x = 0, y = 0;
    double ar = 0;
    const char *p;
    
    p = strchr(arg, ':');
    if (p) {
        x = strtol(arg, (char **)&arg, 10);
	if (arg == p)
	    y = strtol(arg+1, (char **)&arg, 10);
	if (x > 0 && y > 0)
	    ar = (double)x / (double)y;
    } else
        ar = strtod(arg, (char **)&arg);

    if (!ar) {
        fprintf(stderr, "Incorrect aspect ratio specification.\n");
	exit(1);
    }
    frame_aspect_ratio = ar;
}

static void opt_gop_size(const char *arg)
{
    gop_size = atoi(arg);
}

static void opt_b_frames(const char *arg)
{
    b_frames = atoi(arg);
    if (b_frames > FF_MAX_B_FRAMES) {
        fprintf(stderr, "\nCannot have more than %d B frames, increase FF_MAX_B_FRAMES.\n", FF_MAX_B_FRAMES);
        exit(1);
    } else if (b_frames < 1) {
        fprintf(stderr, "\nNumber of B frames must be higher than 0\n");
        exit(1);
    }
}

static void opt_mb_decision(const char *arg)
{
    mb_decision = atoi(arg);
}

static void opt_mb_cmp(const char *arg)
{
    mb_cmp = atoi(arg);
}

static void opt_sub_cmp(const char *arg)
{
    sub_cmp = atoi(arg);
}

static void opt_cmp(const char *arg)
{
    cmp = atoi(arg);
}

static void opt_qscale(const char *arg)
{
    video_qscale = atof(arg);
    if (video_qscale < 0.01 ||
        video_qscale > 255) {
        fprintf(stderr, "qscale must be >= 0.01 and <= 255\n");
        exit(1);
    }
}

static void opt_qmin(const char *arg)
{
    video_qmin = atoi(arg);
    if (video_qmin < 0 ||
        video_qmin > 31) {
        fprintf(stderr, "qmin must be >= 1 and <= 31\n");
        exit(1);
    }
}

static void opt_qmax(const char *arg)
{
    video_qmax = atoi(arg);
    if (video_qmax < 0 ||
        video_qmax > 31) {
        fprintf(stderr, "qmax must be >= 1 and <= 31\n");
        exit(1);
    }
}

static void opt_mb_qmin(const char *arg)
{
    video_mb_qmin = atoi(arg);
    if (video_mb_qmin < 0 ||
        video_mb_qmin > 31) {
        fprintf(stderr, "qmin must be >= 1 and <= 31\n");
        exit(1);
    }
}

static void opt_mb_qmax(const char *arg)
{
    video_mb_qmax = atoi(arg);
    if (video_mb_qmax < 0 ||
        video_mb_qmax > 31) {
        fprintf(stderr, "qmax must be >= 1 and <= 31\n");
        exit(1);
    }
}

static void opt_qdiff(const char *arg)
{
    video_qdiff = atoi(arg);
    if (video_qdiff < 0 ||
        video_qdiff > 31) {
        fprintf(stderr, "qdiff must be >= 1 and <= 31\n");
        exit(1);
    }
}

static void opt_qblur(const char *arg)
{
    video_qblur = atof(arg);
}

static void opt_qcomp(const char *arg)
{
    video_qcomp = atof(arg);
}

static void opt_rc_initial_cplx(const char *arg)
{
    video_rc_initial_cplx = atof(arg);
}
static void opt_b_qfactor(const char *arg)
{
    video_b_qfactor = atof(arg);
}
static void opt_i_qfactor(const char *arg)
{
    video_i_qfactor = atof(arg);
}
static void opt_b_qoffset(const char *arg)
{
    video_b_qoffset = atof(arg);
}
static void opt_i_qoffset(const char *arg)
{
    video_i_qoffset = atof(arg);
}

static void opt_packet_size(const char *arg)
{
    packet_size= atoi(arg);
}

static void opt_error_rate(const char *arg)
{
    error_rate= atoi(arg);
}

static void opt_strict(const char *arg)
{
    strict= atoi(arg);
}

static void opt_audio_bitrate(const char *arg)
{
    audio_bit_rate = atoi(arg) * 1000;
}

static void opt_audio_rate(const char *arg)
{
    audio_sample_rate = atoi(arg);
}

static void opt_audio_channels(const char *arg)
{
    audio_channels = atoi(arg);
}

static void opt_video_device(const char *arg)
{
    video_device = av_strdup(arg);
}

static void opt_video_channel(const char *arg)
{
    video_channel = strtol(arg, NULL, 0);
}

static void opt_video_standard(const char *arg)
{
    video_standard = av_strdup(arg);
}

static void opt_audio_device(const char *arg)
{
    audio_device = av_strdup(arg);
}

static void opt_dv1394(const char *arg)
{
    video_grab_format = "dv1394";
    audio_grab_format = NULL;
}

static void opt_audio_codec(const char *arg)
{
    AVCodec *p;

    if (!strcmp(arg, "copy")) {
        audio_stream_copy = 1;
    } else {
        p = first_avcodec;
        while (p) {
            if (!strcmp(p->name, arg) && p->type == CODEC_TYPE_AUDIO)
                break;
            p = p->next;
        }
        if (p == NULL) {
            fprintf(stderr, "Unknown audio codec '%s'\n", arg);
            exit(1);
        } else {
            audio_codec_id = p->id;
        }
    }
}

static void add_frame_hooker(const char *arg)
{
    int argc = 0;
    char *argv[64];
    int i;
    char *args = av_strdup(arg);

    using_vhook = 1;

    argv[0] = strtok(args, " ");
    while (argc < 62 && (argv[++argc] = strtok(NULL, " "))) {
    }

    i = frame_hook_add(argc, argv);

    if (i != 0) {
        fprintf(stderr, "Failed to add video hook function: %s\n", arg);
        exit(1);
    }
}

const char *motion_str[] = {
    "zero",
    "full",
    "log",
    "phods",
    "epzs",
    "x1",
    NULL,
};

static void opt_motion_estimation(const char *arg)
{
    const char **p;
    p = motion_str;
    for(;;) {
        if (!*p) {
            fprintf(stderr, "Unknown motion estimation method '%s'\n", arg);
            exit(1);
        }
        if (!strcmp(*p, arg))
            break;
        p++;
    }
    me_method = (p - motion_str) + 1;
}

static void opt_video_codec(const char *arg)
{