ffmpeg.c

/*
 * Copyright (c) 2000-2003 Fabrice Bellard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * multimedia converter based on the FFmpeg libraries
 */

#include "config.h"
#include <ctype.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#if HAVE_ISATTY
#include <unistd.h>
#endif
#include "libavformat/avformat.h"
#include "libavdevice/avdevice.h"
#include "libswscale/swscale.h"
#include "libswresample/swresample.h"
#include "libavutil/opt.h"
#include "libavutil/audioconvert.h"
#include "libavutil/parseutils.h"
#include "libavutil/samplefmt.h"
#include "libavutil/colorspace.h"
#include "libavutil/fifo.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "libavutil/mathematics.h"
#include "libavutil/pixdesc.h"
#include "libavutil/avstring.h"
#include "libavutil/libm.h"
#include "libavutil/imgutils.h"
#include "libavutil/timestamp.h"
#include "libavutil/bprint.h"
#include "libavutil/time.h"
#include "libavformat/os_support.h"

#include "libavformat/ffm.h" // not public API

# include "libavfilter/avcodec.h"
# include "libavfilter/avfilter.h"
# include "libavfilter/avfiltergraph.h"
# include "libavfilter/buffersrc.h"
# include "libavfilter/buffersink.h"

#if HAVE_SYS_RESOURCE_H
#include <sys/types.h>
#include <sys/resource.h>
#elif HAVE_GETPROCESSTIMES
#include <windows.h>
#endif
#if HAVE_GETPROCESSMEMORYINFO
#include <windows.h>
#include <psapi.h>
#endif

#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif

#if HAVE_TERMIOS_H
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <termios.h>
#elif HAVE_KBHIT
#include <conio.h>
#endif

#if HAVE_PTHREADS
#include <pthread.h>
#endif

#include <time.h>

#include "ffmpeg.h"
#include "cmdutils.h"

#include "libavutil/avassert.h"

const char program_name[] = "ffmpeg";
const int program_birth_year = 2000;

static FILE *vstats_file;

static void do_video_stats(AVFormatContext *os, OutputStream *ost, int frame_size);
static int64_t getutime(void);

static int run_as_daemon  = 0;
static int64_t video_size = 0;
static int64_t audio_size = 0;
static int64_t subtitle_size = 0;
static int64_t extra_size = 0;
static int nb_frames_dup = 0;
static int nb_frames_drop = 0;

static int current_time;
AVIOContext *progress_avio = NULL;

static uint8_t *subtitle_out;

#if HAVE_PTHREADS
/* signal to input threads that they should exit; set by the main thread */
static int transcoding_finished;
#endif

#define DEFAULT_PASS_LOGFILENAME_PREFIX "ffmpeg2pass"

InputStream **input_streams = NULL;
int        nb_input_streams = 0;
InputFile   **input_files   = NULL;
int        nb_input_files   = 0;

OutputStream **output_streams = NULL;
int         nb_output_streams = 0;
OutputFile   **output_files   = NULL;
int         nb_output_files   = 0;

FilterGraph **filtergraphs;
int        nb_filtergraphs;

#if HAVE_TERMIOS_H

/* init terminal so that we can grab keys */
static struct termios oldtty;
static int restore_tty;
#endif


/* sub2video hack:
   Convert subtitles to video with alpha to insert them in filter graphs.
   This is a temporary solution until libavfilter gets real subtitles support.
 */



static void sub2video_copy_rect(uint8_t *dst, int dst_linesize, int w, int h,
                                AVSubtitleRect *r)
{
    uint32_t *pal, *dst2;
    uint8_t *src, *src2;
    int x, y;

    if (r->type != SUBTITLE_BITMAP) {
        av_log(NULL, AV_LOG_WARNING, "sub2video: non-bitmap subtitle\n");
        return;
    }
    if (r->x < 0 || r->x + r->w > w || r->y < 0 || r->y + r->h > h) {
        av_log(NULL, AV_LOG_WARNING, "sub2video: rectangle overflowing\n");
        return;
    }

    dst += r->y * dst_linesize + r->x * 4;
    src = r->pict.data[0];
    pal = (uint32_t *)r->pict.data[1];
    for (y = 0; y < r->h; y++) {
        dst2 = (uint32_t *)dst;
        src2 = src;
        for (x = 0; x < r->w; x++)
            *(dst2++) = pal[*(src2++)];
        dst += dst_linesize;
        src += r->pict.linesize[0];
    }
}

static void sub2video_push_ref(InputStream *ist, int64_t pts)
{
    AVFilterBufferRef *ref = ist->sub2video.ref;
    int i;

    ist->sub2video.last_pts = ref->pts = pts;
    for (i = 0; i < ist->nb_filters; i++)
        av_buffersrc_add_ref(ist->filters[i]->filter,
                             avfilter_ref_buffer(ref, ~0),
                             AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT |
                             AV_BUFFERSRC_FLAG_NO_COPY |
                             AV_BUFFERSRC_FLAG_PUSH);
}

static void sub2video_update(InputStream *ist, AVSubtitle *sub, int64_t pts)
{
    int w = ist->sub2video.w, h = ist->sub2video.h;
    AVFilterBufferRef *ref = ist->sub2video.ref;
    int8_t *dst;
    int     dst_linesize;
    int i;

    if (!ref)
        return;
    dst          = ref->data    [0];
    dst_linesize = ref->linesize[0];
    memset(dst, 0, h * dst_linesize);
    for (i = 0; i < sub->num_rects; i++)
        sub2video_copy_rect(dst, dst_linesize, w, h, sub->rects[i]);
    sub2video_push_ref(ist, pts);
}

static void sub2video_heartbeat(InputStream *ist, int64_t pts)
{
    InputFile *infile = input_files[ist->file_index];
    int i, j, nb_reqs;
    int64_t pts2;

    /* When a frame is read from a file, examine all sub2video streams in
       the same file and send the sub2video frame again. Otherwise, decoded
       video frames could be accumulating in the filter graph while a filter
       (possibly overlay) is desperately waiting for a subtitle frame. */
    for (i = 0; i < infile->nb_streams; i++) {
        InputStream *ist2 = input_streams[infile->ist_index + i];
        if (!ist2->sub2video.ref)
            continue;
        /* subtitles seem to be usually muxed ahead of other streams;
           if not, substracting a larger time here is necessary */
        pts2 = av_rescale_q(pts, ist->st->time_base, ist2->st->time_base) - 1;
        /* do not send the heartbeat frame if the subtitle is already ahead */
        if (pts2 <= ist2->sub2video.last_pts)
            continue;
        for (j = 0, nb_reqs = 0; j < ist2->nb_filters; j++)
            nb_reqs += av_buffersrc_get_nb_failed_requests(ist2->filters[j]->filter);
        if (nb_reqs)
            sub2video_push_ref(ist2, pts2);
    }
}

static void sub2video_flush(InputStream *ist)
{
    int i;

    for (i = 0; i < ist->nb_filters; i++)
        av_buffersrc_add_ref(ist->filters[i]->filter, NULL, 0);
}

/* end of sub2video hack */

void term_exit(void)
{
    av_log(NULL, AV_LOG_QUIET, "%s", "");
#if HAVE_TERMIOS_H
    if(restore_tty)
        tcsetattr (0, TCSANOW, &oldtty);
#endif
}

static volatile int received_sigterm = 0;
static volatile int received_nb_signals = 0;

static void
sigterm_handler(int sig)
{
    received_sigterm = sig;
    received_nb_signals++;
    term_exit();
    if(received_nb_signals > 3)
        exit(123);
}

void term_init(void)
{
#if HAVE_TERMIOS_H
    if(!run_as_daemon){
        struct termios tty;
        int istty = 1;
#if HAVE_ISATTY
        istty = isatty(0) && isatty(2);
#endif
        if (istty && tcgetattr (0, &tty) == 0) {
            oldtty = tty;
            restore_tty = 1;
            atexit(term_exit);

            tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
                             |INLCR|IGNCR|ICRNL|IXON);
            tty.c_oflag |= OPOST;
            tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
            tty.c_cflag &= ~(CSIZE|PARENB);
            tty.c_cflag |= CS8;
            tty.c_cc[VMIN] = 1;
            tty.c_cc[VTIME] = 0;

            tcsetattr (0, TCSANOW, &tty);
        }
        signal(SIGQUIT, sigterm_handler); /* Quit (POSIX).  */
    }
#endif
    avformat_network_deinit();

    signal(SIGINT , sigterm_handler); /* Interrupt (ANSI).    */
    signal(SIGTERM, sigterm_handler); /* Termination (ANSI).  */
#ifdef SIGXCPU
    signal(SIGXCPU, sigterm_handler);
#endif
}

/* read a key without blocking */
static int read_key(void)
{
    unsigned char ch;
#if HAVE_TERMIOS_H
    int n = 1;
    struct timeval tv;
    fd_set rfds;

    FD_ZERO(&rfds);
    FD_SET(0, &rfds);
    tv.tv_sec = 0;
    tv.tv_usec = 0;
    n = select(1, &rfds, NULL, NULL, &tv);
    if (n > 0) {
        n = read(0, &ch, 1);
        if (n == 1)
            return ch;

        return n;
    }
#elif HAVE_KBHIT
#    if HAVE_PEEKNAMEDPIPE
    static int is_pipe;
    static HANDLE input_handle;
    DWORD dw, nchars;
    if(!input_handle){
        input_handle = GetStdHandle(STD_INPUT_HANDLE);
        is_pipe = !GetConsoleMode(input_handle, &dw);
    }

    if (stdin->_cnt > 0) {
        read(0, &ch, 1);
        return ch;
    }
    if (is_pipe) {
        /* When running under a GUI, you will end here. */
        if (!PeekNamedPipe(input_handle, NULL, 0, NULL, &nchars, NULL))
            return -1;
        //Read it
        if(nchars != 0) {
            read(0, &ch, 1);
            return ch;
        }else{
            return -1;
        }
    }
#    endif
    if(kbhit())
        return(getch());
#endif
    return -1;
}

static int decode_interrupt_cb(void *ctx)
{
    return received_nb_signals > 1;
}

const AVIOInterruptCB int_cb = { decode_interrupt_cb, NULL };

void av_noreturn exit_program(int ret)
{
    int i, j;

    for (i = 0; i < nb_filtergraphs; i++) {
        avfilter_graph_free(&filtergraphs[i]->graph);
        for (j = 0; j < filtergraphs[i]->nb_inputs; j++) {
            av_freep(&filtergraphs[i]->inputs[j]->name);
            av_freep(&filtergraphs[i]->inputs[j]);
        }
        av_freep(&filtergraphs[i]->inputs);
        for (j = 0; j < filtergraphs[i]->nb_outputs; j++) {
            av_freep(&filtergraphs[i]->outputs[j]->name);
            av_freep(&filtergraphs[i]->outputs[j]);
        }
        av_freep(&filtergraphs[i]->outputs);
        av_freep(&filtergraphs[i]);
    }
    av_freep(&filtergraphs);

    av_freep(&subtitle_out);

    /* close files */
    for (i = 0; i < nb_output_files; i++) {
        AVFormatContext *s = output_files[i]->ctx;
        if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)
            avio_close(s->pb);
        avformat_free_context(s);
        av_dict_free(&output_files[i]->opts);
        av_freep(&output_files[i]);
    }
    for (i = 0; i < nb_output_streams; i++) {
        AVBitStreamFilterContext *bsfc = output_streams[i]->bitstream_filters;
        while (bsfc) {
            AVBitStreamFilterContext *next = bsfc->next;
            av_bitstream_filter_close(bsfc);
            bsfc = next;
        }
        output_streams[i]->bitstream_filters = NULL;

        av_freep(&output_streams[i]->forced_keyframes);
        av_freep(&output_streams[i]->avfilter);
        av_freep(&output_streams[i]->logfile_prefix);
        av_freep(&output_streams[i]->filtered_frame);
        av_freep(&output_streams[i]);
    }
    for (i = 0; i < nb_input_files; i++) {
        avformat_close_input(&input_files[i]->ctx);
        av_freep(&input_files[i]);
    }
    for (i = 0; i < nb_input_streams; i++) {
        av_freep(&input_streams[i]->decoded_frame);
        av_dict_free(&input_streams[i]->opts);
        free_buffer_pool(&input_streams[i]->buffer_pool);
        avfilter_unref_bufferp(&input_streams[i]->sub2video.ref);
        av_freep(&input_streams[i]->filters);
        av_freep(&input_streams[i]);
    }

    if (vstats_file)
        fclose(vstats_file);
    av_free(vstats_filename);

    av_freep(&input_streams);
    av_freep(&input_files);
    av_freep(&output_streams);
    av_freep(&output_files);

    uninit_opts();

    avfilter_uninit();
    avformat_network_deinit();

    if (received_sigterm) {
        av_log(NULL, AV_LOG_INFO, "Received signal %d: terminating.\n",
               (int) received_sigterm);
        exit (255);
    }

    exit(ret);
}

void assert_avoptions(AVDictionary *m)
{
    AVDictionaryEntry *t;
    if ((t = av_dict_get(m, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
        av_log(NULL, AV_LOG_FATAL, "Option %s not found.\n", t->key);
        exit_program(1);
    }
}

static void assert_codec_experimental(AVCodecContext *c, int encoder)
{
    const char *codec_string = encoder ? "encoder" : "decoder";
    AVCodec *codec;
    if (c->codec->capabilities & CODEC_CAP_EXPERIMENTAL &&
        c->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
        av_log(NULL, AV_LOG_FATAL, "%s '%s' is experimental and might produce bad "
                "results.\nAdd '-strict experimental' if you want to use it.\n",
                codec_string, c->codec->name);
        codec = encoder ? avcodec_find_encoder(c->codec->id) : avcodec_find_decoder(c->codec->id);
        if (!(codec->capabilities & CODEC_CAP_EXPERIMENTAL))
            av_log(NULL, AV_LOG_FATAL, "Or use the non experimental %s '%s'.\n",
                   codec_string, codec->name);
        exit_program(1);
    }
}

static void update_benchmark(const char *fmt, ...)
{
    if (do_benchmark_all) {
        int64_t t = getutime();
        va_list va;
        char buf[1024];

        if (fmt) {
            va_start(va, fmt);
            vsnprintf(buf, sizeof(buf), fmt, va);
            va_end(va);
            printf("bench: %8"PRIu64" %s \n", t - current_time, buf);
        }
        current_time = t;
    }
}

static void write_frame(AVFormatContext *s, AVPacket *pkt, OutputStream *ost)
{
    AVBitStreamFilterContext *bsfc = ost->bitstream_filters;
    AVCodecContext          *avctx = ost->st->codec;
    int ret;

    if ((avctx->codec_type == AVMEDIA_TYPE_VIDEO && video_sync_method == VSYNC_DROP) ||
        (avctx->codec_type == AVMEDIA_TYPE_AUDIO && audio_sync_method < 0))
        pkt->pts = pkt->dts = AV_NOPTS_VALUE;

    if ((avctx->codec_type == AVMEDIA_TYPE_AUDIO || avctx->codec_type == AVMEDIA_TYPE_VIDEO) && pkt->dts != AV_NOPTS_VALUE) {
        int64_t max = ost->st->cur_dts + !(s->oformat->flags & AVFMT_TS_NONSTRICT);
        if (ost->st->cur_dts && ost->st->cur_dts != AV_NOPTS_VALUE &&  max > pkt->dts) {
            av_log(s, max - pkt->dts > 2 || avctx->codec_type == AVMEDIA_TYPE_VIDEO ? AV_LOG_WARNING : AV_LOG_DEBUG,
                   "st:%d PTS: %"PRId64" DTS: %"PRId64" < %"PRId64" invalid, clipping\n", pkt->stream_index, pkt->pts, pkt->dts, max);
            if(pkt->pts >= pkt->dts)
                pkt->pts = FFMAX(pkt->pts, max);
            pkt->dts = max;
        }
    }

    /*
     * Audio encoders may split the packets --  #frames in != #packets out.
     * But there is no reordering, so we can limit the number of output packets
     * by simply dropping them here.
     * Counting encoded video frames needs to be done separately because of
     * reordering, see do_video_out()
     */
    if (!(avctx->codec_type == AVMEDIA_TYPE_VIDEO && avctx->codec)) {
        if (ost->frame_number >= ost->max_frames) {
            av_free_packet(pkt);
            return;
        }
        ost->frame_number++;
    }

    while (bsfc) {
        AVPacket new_pkt = *pkt;
        int a = av_bitstream_filter_filter(bsfc, avctx, NULL,
                                           &new_pkt.data, &new_pkt.size,
                                           pkt->data, pkt->size,
                                           pkt->flags & AV_PKT_FLAG_KEY);
        if(a == 0 && new_pkt.data != pkt->data && new_pkt.destruct) {
            uint8_t *t = av_malloc(new_pkt.size + FF_INPUT_BUFFER_PADDING_SIZE); //the new should be a subset of the old so cannot overflow
            if(t) {
                memcpy(t, new_pkt.data, new_pkt.size);
                memset(t + new_pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
                new_pkt.data = t;
                a = 1;
            } else
                a = AVERROR(ENOMEM);
        }
        if (a > 0) {
            av_free_packet(pkt);
            new_pkt.destruct = av_destruct_packet;
        } else if (a < 0) {
            av_log(NULL, AV_LOG_ERROR, "Failed to open bitstream filter %s for stream %d with codec %s",
                   bsfc->filter->name, pkt->stream_index,
                   avctx->codec ? avctx->codec->name : "copy");
            print_error("", a);
            if (exit_on_error)
                exit_program(1);
        }
        *pkt = new_pkt;

        bsfc = bsfc->next;
    }

    pkt->stream_index = ost->index;
    ret = av_interleaved_write_frame(s, pkt);
    if (ret < 0) {
        print_error("av_interleaved_write_frame()", ret);
        exit_program(1);
    }
}

static void close_output_stream(OutputStream *ost)
{
    OutputFile *of = output_files[ost->file_index];

    ost->finished = 1;
    if (of->shortest) {
        int i;
        for (i = 0; i < of->ctx->nb_streams; i++)
            output_streams[of->ost_index + i]->finished = 1;
    }
}

static int check_recording_time(OutputStream *ost)
{
    OutputFile *of = output_files[ost->file_index];

    if (of->recording_time != INT64_MAX &&
        av_compare_ts(ost->sync_opts - ost->first_pts, ost->st->codec->time_base, of->recording_time,
                      AV_TIME_BASE_Q) >= 0) {
        close_output_stream(ost);
        return 0;
    }
    return 1;
}

static void do_audio_out(AVFormatContext *s, OutputStream *ost,
                         AVFrame *frame)
{
    AVCodecContext *enc = ost->st->codec;
    AVPacket pkt;
    int got_packet = 0;

    av_init_packet(&pkt);
    pkt.data = NULL;
    pkt.size = 0;

    if (!check_recording_time(ost))
        return;

    if (frame->pts == AV_NOPTS_VALUE || audio_sync_method < 0)
        frame->pts = ost->sync_opts;
    ost->sync_opts = frame->pts + frame->nb_samples;

    av_assert0(pkt.size || !pkt.data);
    update_benchmark(NULL);
    if (avcodec_encode_audio2(enc, &pkt, frame, &got_packet) < 0) {
        av_log(NULL, AV_LOG_FATAL, "Audio encoding failed (avcodec_encode_audio2)\n");
        exit_program(1);
    }
    update_benchmark("encode_audio %d.%d", ost->file_index, ost->index);

    if (got_packet) {
        if (pkt.pts != AV_NOPTS_VALUE)
            pkt.pts      = av_rescale_q(pkt.pts,      enc->time_base, ost->st->time_base);
        if (pkt.dts != AV_NOPTS_VALUE)
            pkt.dts      = av_rescale_q(pkt.dts,      enc->time_base, ost->st->time_base);
        if (pkt.duration > 0)
            pkt.duration = av_rescale_q(pkt.duration, enc->time_base, ost->st->time_base);

        if (debug_ts) {
            av_log(NULL, AV_LOG_INFO, "encoder -> type:audio "
                   "pkt_pts:%s pkt_pts_time:%s pkt_dts:%s pkt_dts_time:%s\n",
                   av_ts2str(pkt.pts), av_ts2timestr(pkt.pts, &ost->st->time_base),
                   av_ts2str(pkt.dts), av_ts2timestr(pkt.dts, &ost->st->time_base));
        }

        audio_size += pkt.size;
        write_frame(s, &pkt, ost);

        av_free_packet(&pkt);
    }
}

static void pre_process_video_frame(InputStream *ist, AVPicture *picture, void **bufp)
{
    AVCodecContext *dec;
    AVPicture *picture2;
    AVPicture picture_tmp;
    uint8_t *buf = 0;

    dec = ist->st->codec;

    /* deinterlace : must be done before any resize */
    if (do_deinterlace) {
        int size;

        /* create temporary picture */
        size = avpicture_get_size(dec->pix_fmt, dec->width, dec->height);
        buf  = av_malloc(size);
        if (!buf)
            return;

        picture2 = &picture_tmp;
        avpicture_fill(picture2, buf, dec->pix_fmt, dec->width, dec->height);

        if (avpicture_deinterlace(picture2, picture,
                                 dec->pix_fmt, dec->width, dec->height) < 0) {
            /* if error, do not deinterlace */
            av_log(NULL, AV_LOG_WARNING, "Deinterlacing failed\n");
            av_free(buf);
            buf = NULL;
            picture2 = picture;
        }
    } else {
        picture2 = picture;
    }

    if (picture != picture2)
        *picture = *picture2;
    *bufp = buf;
}

static void do_subtitle_out(AVFormatContext *s,
                            OutputStream *ost,
                            InputStream *ist,
                            AVSubtitle *sub,
                            int64_t pts)
{
    int subtitle_out_max_size = 1024 * 1024;
    int subtitle_out_size, nb, i;
    AVCodecContext *enc;
    AVPacket pkt;

    if (pts == AV_NOPTS_VALUE) {
        av_log(NULL, AV_LOG_ERROR, "Subtitle packets must have a pts\n");
        if (exit_on_error)
            exit_program(1);
        return;
    }

    enc = ost->st->codec;

    if (!subtitle_out) {
        subtitle_out = av_malloc(subtitle_out_max_size);
    }

    /* Note: DVB subtitle need one packet to draw them and one other
       packet to clear them */
    /* XXX: signal it in the codec context ? */
    if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE)
        nb = 2;
    else
        nb = 1;

    /* shift timestamp to honor -ss and make check_recording_time() work with -t */
    pts = av_rescale_q(pts, ist->st->time_base, AV_TIME_BASE_Q)
        - output_files[ost->file_index]->start_time;
    for (i = 0; i < nb; i++) {
        ost->sync_opts = av_rescale_q(pts, AV_TIME_BASE_Q, enc->time_base);
        if (!check_recording_time(ost))
            return;

        sub->pts = pts;
        // start_display_time is required to be 0
        sub->pts               += av_rescale_q(sub->start_display_time, (AVRational){ 1, 1000 }, AV_TIME_BASE_Q);
        sub->end_display_time  -= sub->start_display_time;
        sub->start_display_time = 0;
        if (i == 1)
            sub->num_rects = 0;
        subtitle_out_size = avcodec_encode_subtitle(enc, subtitle_out,
                                                    subtitle_out_max_size, sub);
        if (subtitle_out_size < 0) {
            av_log(NULL, AV_LOG_FATAL, "Subtitle encoding failed\n");
            exit_program(1);
        }

        av_init_packet(&pkt);
        pkt.data = subtitle_out;
        pkt.size = subtitle_out_size;
        pkt.pts  = av_rescale_q(sub->pts, AV_TIME_BASE_Q, ost->st->time_base);
        pkt.duration = av_rescale_q(sub->end_display_time, (AVRational){ 1, 1000 }, ost->st->time_base);
        if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE) {
            /* XXX: the pts correction is handled here. Maybe handling
               it in the codec would be better */
            if (i == 0)
                pkt.pts += 90 * sub->start_display_time;
            else
                pkt.pts += 90 * sub->end_display_time;
        }
        subtitle_size += pkt.size;
        write_frame(s, &pkt, ost);
    }
}

static void do_video_out(AVFormatContext *s,
                         OutputStream *ost,
                         AVFrame *in_picture,
                         float quality)
{
    int ret, format_video_sync;
    AVPacket pkt;
    AVCodecContext *enc = ost->st->codec;
    int nb_frames, i;
    double sync_ipts, delta;
    double duration = 0;
    int frame_size = 0;
    InputStream *ist = NULL;

    if (ost->source_index >= 0)
        ist = input_streams[ost->source_index];

    if(ist && ist->st->start_time != AV_NOPTS_VALUE && ist->st->first_dts != AV_NOPTS_VALUE && ost->frame_rate.num)
        duration = 1/(av_q2d(ost->frame_rate) * av_q2d(enc->time_base));

    sync_ipts = in_picture->pts;
    delta = sync_ipts - ost->sync_opts + duration;

    /* by default, we output a single frame */
    nb_frames = 1;

    format_video_sync = video_sync_method;
    if (format_video_sync == VSYNC_AUTO)
        format_video_sync = (s->oformat->flags & AVFMT_VARIABLE_FPS) ? ((s->oformat->flags & AVFMT_NOTIMESTAMPS) ? VSYNC_PASSTHROUGH : VSYNC_VFR) : 1;

    switch (format_video_sync) {
    case VSYNC_CFR:
        // FIXME set to 0.5 after we fix some dts/pts bugs like in avidec.c
        if (delta < -1.1)
            nb_frames = 0;
        else if (delta > 1.1)
            nb_frames = lrintf(delta);
        break;
    case VSYNC_VFR:
        if (delta <= -0.6)
            nb_frames = 0;
        else if (delta > 0.6)
            ost->sync_opts = lrint(sync_ipts);
        break;
    case VSYNC_DROP:
    case VSYNC_PASSTHROUGH:
        ost->sync_opts = lrint(sync_ipts);
        break;
    default:
        av_assert0(0);
    }

    nb_frames = FFMIN(nb_frames, ost->max_frames - ost->frame_number);
    if (nb_frames == 0) {
        nb_frames_drop++;
        av_log(NULL, AV_LOG_VERBOSE, "*** drop!\n");
        return;
    } else if (nb_frames > 1) {
        if (nb_frames > dts_error_threshold * 30) {
            av_log(NULL, AV_LOG_ERROR, "%d frame duplication too large, skiping\n", nb_frames - 1);
            nb_frames_drop++;
            return;
        }
        nb_frames_dup += nb_frames - 1;
        av_log(NULL, AV_LOG_VERBOSE, "*** %d dup!\n", nb_frames - 1);
    }

  /* duplicates frame if needed */
  for (i = 0; i < nb_frames; i++) {
    av_init_packet(&pkt);
    pkt.data = NULL;
    pkt.size = 0;

    in_picture->pts = ost->sync_opts;

    if (!check_recording_time(ost))
        return;

    if (s->oformat->flags & AVFMT_RAWPICTURE &&
        enc->codec->id == AV_CODEC_ID_RAWVIDEO) {
        /* raw pictures are written as AVPicture structure to
           avoid any copies. We support temporarily the older
           method. */
        enc->coded_frame->interlaced_frame = in_picture->interlaced_frame;
        enc->coded_frame->top_field_first  = in_picture->top_field_first;
        pkt.data   = (uint8_t *)in_picture;
        pkt.size   =  sizeof(AVPicture);
        pkt.pts    = av_rescale_q(in_picture->pts, enc->time_base, ost->st->time_base);
        pkt.flags |= AV_PKT_FLAG_KEY;

        video_size += pkt.size;
        write_frame(s, &pkt, ost);
    } else {
        int got_packet;
        AVFrame big_picture;

        big_picture = *in_picture;
        /* better than nothing: use input picture interlaced
           settings */
        big_picture.interlaced_frame = in_picture->interlaced_frame;
        if (ost->st->codec->flags & (CODEC_FLAG_INTERLACED_DCT|CODEC_FLAG_INTERLACED_ME)) {
            if (ost->top_field_first == -1)
                big_picture.top_field_first = in_picture->top_field_first;
            else
                big_picture.top_field_first = !!ost->top_field_first;
        }

        /* handles same_quant here. This is not correct because it may
           not be a global option */
        big_picture.quality = quality;
        if (!enc->me_threshold)
            big_picture.pict_type = 0;
        if (ost->forced_kf_index < ost->forced_kf_count &&
            big_picture.pts >= ost->forced_kf_pts[ost->forced_kf_index]) {
            big_picture.pict_type = AV_PICTURE_TYPE_I;
            ost->forced_kf_index++;
        }
        update_benchmark(NULL);
        ret = avcodec_encode_video2(enc, &pkt, &big_picture, &got_packet);
        update_benchmark("encode_video %d.%d", ost->file_index, ost->index);
        if (ret < 0) {
            av_log(NULL, AV_LOG_FATAL, "Video encoding failed\n");
            exit_program(1);
        }

        if (got_packet) {
            if (pkt.pts == AV_NOPTS_VALUE && !(enc->codec->capabilities & CODEC_CAP_DELAY))
                pkt.pts = ost->sync_opts;

            if (pkt.pts != AV_NOPTS_VALUE)
                pkt.pts = av_rescale_q(pkt.pts, enc->time_base, ost->st->time_base);
            if (pkt.dts != AV_NOPTS_VALUE)
                pkt.dts = av_rescale_q(pkt.dts, enc->time_base, ost->st->time_base);

            if (debug_ts) {
                av_log(NULL, AV_LOG_INFO, "encoder -> type:video "
                    "pkt_pts:%s pkt_pts_time:%s pkt_dts:%s pkt_dts_time:%s\n",
                    av_ts2str(pkt.pts), av_ts2timestr(pkt.pts, &ost->st->time_base),
                    av_ts2str(pkt.dts), av_ts2timestr(pkt.dts, &ost->st->time_base));
            }

            frame_size = pkt.size;
            video_size += pkt.size;
            write_frame(s, &pkt, ost);
            av_free_packet(&pkt);

            /* if two pass, output log */
            if (ost->logfile && enc->stats_out) {
                fprintf(ost->logfile, "%s", enc->stats_out);
            }
        }
    }
    ost->sync_opts++;
    /*
     * For video, number of frames in == number of packets out.
     * But there may be reordering, so we can't throw away frames on encoder
     * flush, we need to limit them here, before they go into encoder.
     */
    ost->frame_number++;
  }

    if (vstats_filename && frame_size)
        do_video_stats(output_files[ost->file_index]->ctx, ost, frame_size);
}

static double psnr(double d)
{
    return -10.0 * log(d) / log(10.0);
}

static void do_video_stats(AVFormatContext *os, OutputStream *ost,
                           int frame_size)
{
    AVCodecContext *enc;
    int frame_number;
    double ti1, bitrate, avg_bitrate;

    /* this is executed just the first time do_video_stats is called */
    if (!vstats_file) {
        vstats_file = fopen(vstats_filename, "w");
        if (!vstats_file) {
            perror("fopen");
            exit_program(1);
        }
    }

    enc = ost->st->codec;
    if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
        frame_number = ost->frame_number;
        fprintf(vstats_file, "frame= %5d q= %2.1f ", frame_number, enc->coded_frame->quality / (float)FF_QP2LAMBDA);
        if (enc->flags&CODEC_FLAG_PSNR)
            fprintf(vstats_file, "PSNR= %6.2f ", psnr(enc->coded_frame->error[0] / (enc->width * enc->height * 255.0 * 255.0)));

        fprintf(vstats_file,"f_size= %6d ", frame_size);
        /* compute pts value */
        ti1 = ost->sync_opts * av_q2d(enc->time_base);
        if (ti1 < 0.01)
            ti1 = 0.01;

        bitrate     = (frame_size * 8) / av_q2d(enc->time_base) / 1000.0;
        avg_bitrate = (double)(video_size * 8) / ti1 / 1000.0;
        fprintf(vstats_file, "s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s ",
               (double)video_size / 1024, ti1, bitrate, avg_bitrate);
        fprintf(vstats_file, "type= %c\n", av_get_picture_type_char(enc->coded_frame->pict_type));
    }
}

/**
 * Get and encode new output from any of the filtergraphs, without causing
 * activity.
 *
 * @return  0 for success, <0 for severe errors
 */
static int reap_filters(void)
{
    AVFilterBufferRef *picref;
    AVFrame *filtered_frame = NULL;
    int i;
    int64_t frame_pts;

    /* Reap all buffers present in the buffer sinks */
    for (i = 0; i < nb_output_streams; i++) {
        OutputStream *ost = output_streams[i];
        OutputFile    *of = output_files[ost->file_index];
        int ret = 0;

        if (!ost->filter)
            continue;

        if (!ost->filtered_frame && !(ost->filtered_frame = avcodec_alloc_frame())) {
            return AVERROR(ENOMEM);
        } else
            avcodec_get_frame_defaults(ost->filtered_frame);
        filtered_frame = ost->filtered_frame;

        while (1) {
            ret = av_buffersink_get_buffer_ref(ost->filter->filter, &picref,
                                               AV_BUFFERSINK_FLAG_NO_REQUEST);
            if (ret < 0) {
                if (ret != AVERROR(EAGAIN) && ret != AVERROR_EOF) {
                    char buf[256];