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mpv/video/image_writer.c

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/*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavutil/mem.h>
#include <libavutil/opt.h>
#include <libavutil/pixdesc.h>
#include "common/msg.h"
#include "config.h"
#if HAVE_JPEG
#include <setjmp.h>
#include <jpeglib.h>
#endif
#include "osdep/io.h"
#include "common/av_common.h"
#include "common/msg.h"
#include "image_writer.h"
#include "mpv_talloc.h"
#include "video/fmt-conversion.h"
#include "video/img_format.h"
#include "video/mp_image.h"
#include "video/sws_utils.h"
#include "options/m_option.h"
const struct image_writer_opts image_writer_opts_defaults = {
.format = AV_CODEC_ID_MJPEG,
.high_bit_depth = true,
.png_compression = 7,
.png_filter = 5,
.jpeg_quality = 90,
.jpeg_source_chroma = true,
.webp_quality = 75,
.webp_compression = 4,
.jxl_distance = 1.0,
.jxl_effort = 4,
.avif_encoder = "libaom-av1",
.avif_pixfmt = "yuv420p",
.avif_opts = (char*[]){
"usage", "allintra",
"crf", "32",
"cpu-used", "8",
"tune", "ssim",
NULL
},
.tag_csp = true,
};
const struct m_opt_choice_alternatives mp_image_writer_formats[] = {
{"jpg", AV_CODEC_ID_MJPEG},
{"jpeg", AV_CODEC_ID_MJPEG},
{"png", AV_CODEC_ID_PNG},
{"webp", AV_CODEC_ID_WEBP},
#if HAVE_JPEGXL
{"jxl", AV_CODEC_ID_JPEGXL},
#endif
#if HAVE_AVIF_MUXER
{"avif", AV_CODEC_ID_AV1},
#endif
{0}
};
#define OPT_BASE_STRUCT struct image_writer_opts
const struct m_option image_writer_opts[] = {
{"format", OPT_CHOICE_C(format, mp_image_writer_formats)},
{"jpeg-quality", OPT_INT(jpeg_quality), M_RANGE(0, 100)},
{"jpeg-source-chroma", OPT_BOOL(jpeg_source_chroma)},
{"png-compression", OPT_INT(png_compression), M_RANGE(0, 9)},
{"png-filter", OPT_INT(png_filter), M_RANGE(0, 5)},
{"webp-lossless", OPT_BOOL(webp_lossless)},
{"webp-quality", OPT_INT(webp_quality), M_RANGE(0, 100)},
{"webp-compression", OPT_INT(webp_compression), M_RANGE(0, 6)},
#if HAVE_JPEGXL
{"jxl-distance", OPT_DOUBLE(jxl_distance), M_RANGE(0.0, 15.0)},
{"jxl-effort", OPT_INT(jxl_effort), M_RANGE(1, 9)},
#endif
#if HAVE_AVIF_MUXER
{"avif-encoder", OPT_STRING(avif_encoder)},
{"avif-opts", OPT_KEYVALUELIST(avif_opts)},
{"avif-pixfmt", OPT_STRING(avif_pixfmt)},
#endif
{"high-bit-depth", OPT_BOOL(high_bit_depth)},
{"tag-colorspace", OPT_BOOL(tag_csp)},
{0},
};
struct image_writer_ctx {
struct mp_log *log;
const struct image_writer_opts *opts;
struct mp_imgfmt_desc original_format;
};
static enum AVPixelFormat replace_j_format(enum AVPixelFormat fmt)
{
switch (fmt) {
case AV_PIX_FMT_YUV420P: return AV_PIX_FMT_YUVJ420P;
case AV_PIX_FMT_YUV422P: return AV_PIX_FMT_YUVJ422P;
case AV_PIX_FMT_YUV444P: return AV_PIX_FMT_YUVJ444P;
}
return fmt;
}
static void prepare_avframe(AVFrame *pic, AVCodecContext *avctx,
mp_image_t *image, bool tag_csp,
struct mp_log *log)
{
for (int n = 0; n < 4; n++) {
pic->data[n] = image->planes[n];
pic->linesize[n] = image->stride[n];
}
pic->format = avctx->pix_fmt;
pic->width = avctx->width;
pic->height = avctx->height;
avctx->color_range = pic->color_range =
mp_csp_levels_to_avcol_range(image->params.color.levels);
if (!tag_csp)
return;
avctx->color_primaries = pic->color_primaries =
mp_csp_prim_to_avcol_pri(image->params.color.primaries);
avctx->color_trc = pic->color_trc =
mp_csp_trc_to_avcol_trc(image->params.color.gamma);
avctx->colorspace = pic->colorspace =
mp_csp_to_avcol_spc(image->params.color.space);
avctx->chroma_sample_location = pic->chroma_location =
mp_chroma_location_to_av(image->params.chroma_location);
mp_dbg(log, "mapped color params:\n"
" trc = %s\n"
" primaries = %s\n"
" range = %s\n"
" colorspace = %s\n"
" chroma_location = %s\n",
av_color_transfer_name(avctx->color_trc),
av_color_primaries_name(avctx->color_primaries),
av_color_range_name(avctx->color_range),
av_color_space_name(avctx->colorspace),
av_chroma_location_name(avctx->chroma_sample_location)
);
}
static bool write_lavc(struct image_writer_ctx *ctx, mp_image_t *image, const char *filename)
{
FILE *fp = fopen(filename, "wb");
if (!fp) {
MP_ERR(ctx, "Error opening '%s' for writing!\n", filename);
return false;
}
bool success = false;
AVFrame *pic = NULL;
AVPacket *pkt = NULL;
const AVCodec *codec;
if (ctx->opts->format == AV_CODEC_ID_WEBP) {
codec = avcodec_find_encoder_by_name("libwebp"); // non-animated encoder
} else {
codec = avcodec_find_encoder(ctx->opts->format);
}
AVCodecContext *avctx = NULL;
if (!codec)
goto print_open_fail;
avctx = avcodec_alloc_context3(codec);
if (!avctx)
goto print_open_fail;
avctx->time_base = AV_TIME_BASE_Q;
avctx->width = image->w;
avctx->height = image->h;
avctx->pix_fmt = imgfmt2pixfmt(image->imgfmt);
if (codec->id == AV_CODEC_ID_MJPEG) {
// Annoying deprecated garbage for the jpg encoder.
if (image->params.color.levels == MP_CSP_LEVELS_PC)
avctx->pix_fmt = replace_j_format(avctx->pix_fmt);
}
if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
MP_ERR(ctx, "Image format %s not supported by lavc.\n",
mp_imgfmt_to_name(image->imgfmt));
goto error_exit;
}
if (codec->id == AV_CODEC_ID_MJPEG) {
avctx->flags |= AV_CODEC_FLAG_QSCALE;
// jpeg_quality is set below
} else if (codec->id == AV_CODEC_ID_PNG) {
avctx->compression_level = ctx->opts->png_compression;
av_opt_set_int(avctx, "pred", ctx->opts->png_filter,
AV_OPT_SEARCH_CHILDREN);
} else if (codec->id == AV_CODEC_ID_WEBP) {
avctx->compression_level = ctx->opts->webp_compression;
av_opt_set_int(avctx, "lossless", ctx->opts->webp_lossless,
AV_OPT_SEARCH_CHILDREN);
av_opt_set_int(avctx, "quality", ctx->opts->webp_quality,
AV_OPT_SEARCH_CHILDREN);
#if HAVE_JPEGXL
} else if (codec->id == AV_CODEC_ID_JPEGXL) {
av_opt_set_double(avctx, "distance", ctx->opts->jxl_distance,
AV_OPT_SEARCH_CHILDREN);
av_opt_set_int(avctx, "effort", ctx->opts->jxl_effort,
AV_OPT_SEARCH_CHILDREN);
#endif
}
if (avcodec_open2(avctx, codec, NULL) < 0) {
print_open_fail:
MP_ERR(ctx, "Could not open libavcodec encoder for saving images\n");
goto error_exit;
}
pic = av_frame_alloc();
if (!pic)
goto error_exit;
prepare_avframe(pic, avctx, image, ctx->opts->tag_csp, ctx->log);
if (codec->id == AV_CODEC_ID_MJPEG) {
int qscale = 1 + (100 - ctx->opts->jpeg_quality) * 30 / 100;
pic->quality = qscale * FF_QP2LAMBDA;
}
int ret = avcodec_send_frame(avctx, pic);
if (ret < 0)
goto error_exit;
ret = avcodec_send_frame(avctx, NULL); // send EOF
if (ret < 0)
goto error_exit;
pkt = av_packet_alloc();
if (!pkt)
goto error_exit;
ret = avcodec_receive_packet(avctx, pkt);
if (ret < 0)
goto error_exit;
success = fwrite(pkt->data, pkt->size, 1, fp) == 1;
error_exit:
avcodec_free_context(&avctx);
av_frame_free(&pic);
av_packet_free(&pkt);
return !fclose(fp) && success;
}
#if HAVE_JPEG
static void write_jpeg_error_exit(j_common_ptr cinfo)
{
// NOTE: do not write error message, too much effort to connect the libjpeg
// log callbacks with mplayer's log function mp_msp()
// Return control to the setjmp point
longjmp(*(jmp_buf*)cinfo->client_data, 1);
}
static bool write_jpeg(struct image_writer_ctx *ctx, mp_image_t *image,
const char *filename)
{
FILE *fp = fopen(filename, "wb");
if (!fp) {
MP_ERR(ctx, "Error opening '%s' for writing!\n", filename);
return false;
}
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jerr.error_exit = write_jpeg_error_exit;
jmp_buf error_return_jmpbuf;
cinfo.client_data = &error_return_jmpbuf;
if (setjmp(cinfo.client_data)) {
jpeg_destroy_compress(&cinfo);
fclose(fp);
return false;
}
jpeg_create_compress(&cinfo);
jpeg_stdio_dest(&cinfo, fp);
cinfo.image_width = image->w;
cinfo.image_height = image->h;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
cinfo.write_JFIF_header = TRUE;
cinfo.JFIF_major_version = 1;
cinfo.JFIF_minor_version = 2;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, ctx->opts->jpeg_quality, 0);
if (ctx->opts->jpeg_source_chroma) {
cinfo.comp_info[0].h_samp_factor = 1 << ctx->original_format.chroma_xs;
cinfo.comp_info[0].v_samp_factor = 1 << ctx->original_format.chroma_ys;
}
jpeg_start_compress(&cinfo, TRUE);
while (cinfo.next_scanline < cinfo.image_height) {
JSAMPROW row_pointer[1];
row_pointer[0] = image->planes[0] +
(ptrdiff_t)cinfo.next_scanline * image->stride[0];
jpeg_write_scanlines(&cinfo, row_pointer,1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
return !fclose(fp);
}
#endif
#if HAVE_AVIF_MUXER
static void log_side_data(struct image_writer_ctx *ctx, AVPacketSideData *data,
size_t size)
{
if (!mp_msg_test(ctx->log, MSGL_DEBUG))
return;
char dbgbuff[129];
if (size)
MP_DBG(ctx, "write_avif() packet side data:\n");
for (int i = 0; i < size; i++) {
AVPacketSideData *sd = &data[i];
for (int k = 0; k < MPMIN(sd->size, 64); k++)
snprintf(dbgbuff + k*2, 3, "%02x", (int)sd->data[k]);
MP_DBG(ctx, " [%d] = {[%s], '%s'}\n",
i, av_packet_side_data_name(sd->type), dbgbuff);
}
}
static bool write_avif(struct image_writer_ctx *ctx, mp_image_t *image,
const char *filename)
{
const AVCodec *codec = NULL;
const AVOutputFormat *ofmt = NULL;
AVCodecContext *avctx = NULL;
AVIOContext *avioctx = NULL;
AVFormatContext *fmtctx = NULL;
AVStream *stream = NULL;
AVFrame *pic = NULL;
AVPacket *pkt = NULL;
int ret;
bool success = false;
codec = avcodec_find_encoder_by_name(ctx->opts->avif_encoder);
if (!codec) {
MP_ERR(ctx, "Could not find encoder '%s', for saving images\n",
ctx->opts->avif_encoder);
goto free_data;
}
ofmt = av_guess_format("avif", NULL, NULL);
if (!ofmt) {
MP_ERR(ctx, "Could not guess output format 'avif'\n");
goto free_data;
}
avctx = avcodec_alloc_context3(codec);
if (!avctx) {
MP_ERR(ctx, "Failed to allocate AVContext.\n");
goto free_data;
}
avctx->width = image->w;
avctx->height = image->h;
avctx->time_base = (AVRational){1, 30};
avctx->pkt_timebase = (AVRational){1, 30};
avctx->codec_type = AVMEDIA_TYPE_VIDEO;
avctx->pix_fmt = imgfmt2pixfmt(image->imgfmt);
if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
MP_ERR(ctx, "Image format %s not supported by lavc.\n",
mp_imgfmt_to_name(image->imgfmt));
goto free_data;
}
av_opt_set_int(avctx, "still-picture", 1, AV_OPT_SEARCH_CHILDREN);
AVDictionary *avd = NULL;
mp_set_avdict(&avd, ctx->opts->avif_opts);
av_opt_set_dict2(avctx, &avd, AV_OPT_SEARCH_CHILDREN);
av_dict_free(&avd);
pic = av_frame_alloc();
if (!pic) {
MP_ERR(ctx, "Could not allocate AVFrame\n");
goto free_data;
}
prepare_avframe(pic, avctx, image, ctx->opts->tag_csp, ctx->log);
// Not setting this flag caused ffmpeg to output avif that was not passing
// standard checks but ffmpeg would still read and not complain...
avctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
ret = avcodec_open2(avctx, codec, NULL);
if (ret < 0) {
MP_ERR(ctx, "Could not open libavcodec encoder for saving images\n");
goto free_data;
}
ret = avio_open(&avioctx, filename, AVIO_FLAG_WRITE);
if (ret < 0) {
MP_ERR(ctx, "Could not open file '%s' for saving images\n", filename);
goto free_data;
}
fmtctx = avformat_alloc_context();
if (!fmtctx) {
MP_ERR(ctx, "Could not allocate format context\n");
goto free_data;
}
fmtctx->pb = avioctx;
fmtctx->oformat = ofmt;
stream = avformat_new_stream(fmtctx, codec);
if (!stream) {
MP_ERR(ctx, "Could not allocate stream\n");
goto free_data;
}
ret = avcodec_parameters_from_context(stream->codecpar, avctx);
if (ret < 0) {
MP_ERR(ctx, "Could not copy parameters from context\n");
goto free_data;
}
ret = avformat_init_output(fmtctx, NULL);
if (ret < 0) {
MP_ERR(ctx, "Could not initialize output\n");
goto free_data;
}
ret = avformat_write_header(fmtctx, NULL);
if (ret < 0) {
MP_ERR(ctx, "Could not write format header\n");
goto free_data;
}
pkt = av_packet_alloc();
if (!pkt) {
MP_ERR(ctx, "Could not allocate packet\n");
goto free_data;
}
ret = avcodec_send_frame(avctx, pic);
if (ret < 0) {
MP_ERR(ctx, "Error sending frame\n");
goto free_data;
}
ret = avcodec_send_frame(avctx, NULL); // send EOF
if (ret < 0)
goto free_data;
int pts = 0;
log_side_data(ctx, avctx->coded_side_data, avctx->nb_coded_side_data);
while (ret >= 0) {
ret = avcodec_receive_packet(avctx, pkt);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
break;
if (ret < 0) {
MP_ERR(ctx, "Error receiving packet\n");
goto free_data;
}
pkt->dts = pkt->pts = ++pts;
pkt->stream_index = stream->index;
log_side_data(ctx, pkt->side_data, pkt->side_data_elems);
ret = av_write_frame(fmtctx, pkt);
if (ret < 0) {
MP_ERR(ctx, "Error writing frame\n");
goto free_data;
}
av_packet_unref(pkt);
}
ret = av_write_trailer(fmtctx);
if (ret < 0) {
MP_ERR(ctx, "Could not write trailer\n");
goto free_data;
}
MP_DBG(ctx, "write_avif(): avio_size() = %"PRIi64"\n", avio_size(avioctx));
success = true;
free_data:
success = !avio_closep(&avioctx) && success;
avformat_free_context(fmtctx);
avcodec_free_context(&avctx);
av_packet_free(&pkt);
av_frame_free(&pic);
return success;
}
#endif
static int get_encoder_format(const AVCodec *codec, int srcfmt, bool highdepth)
{
const enum AVPixelFormat *pix_fmts = codec->pix_fmts;
int current = 0;
for (int n = 0; pix_fmts && pix_fmts[n] != AV_PIX_FMT_NONE; n++) {
int fmt = pixfmt2imgfmt(pix_fmts[n]);
if (!fmt)
continue;
if (!highdepth) {
// Ignore formats larger than 8 bit per pixel. (Or which are unknown.)
struct mp_regular_imgfmt rdesc;
if (!mp_get_regular_imgfmt(&rdesc, fmt)) {
int ofmt = mp_find_other_endian(fmt);
if (!mp_get_regular_imgfmt(&rdesc, ofmt))
continue;
}
if (rdesc.component_size > 1)
continue;
}
current = current ? mp_imgfmt_select_best(current, fmt, srcfmt) : fmt;
}
return current;
}
static int get_target_format(struct image_writer_ctx *ctx)
{
const AVCodec *codec = avcodec_find_encoder(ctx->opts->format);
if (!codec)
goto unknown;
int srcfmt = ctx->original_format.id;
int target = get_encoder_format(codec, srcfmt, ctx->opts->high_bit_depth);
if (!target) {
mp_dbg(ctx->log, "Falling back to high-depth format.\n");
target = get_encoder_format(codec, srcfmt, true);
}
if (!target)
goto unknown;
return target;
unknown:
return IMGFMT_RGB0;
}
const char *image_writer_file_ext(const struct image_writer_opts *opts)
{
struct image_writer_opts defs = image_writer_opts_defaults;
if (!opts)
opts = &defs;
return m_opt_choice_str(mp_image_writer_formats, opts->format);
}
bool image_writer_high_depth(const struct image_writer_opts *opts)
{
return opts->format == AV_CODEC_ID_PNG
#if HAVE_JPEGXL
|| opts->format == AV_CODEC_ID_JPEGXL
#endif
#if HAVE_AVIF_MUXER
|| opts->format == AV_CODEC_ID_AV1
#endif
;
}
bool image_writer_flexible_csp(const struct image_writer_opts *opts)
{
if (!opts->tag_csp)
return false;
return false
#if HAVE_JPEGXL
|| opts->format == AV_CODEC_ID_JPEGXL
#endif
#if HAVE_AVIF_MUXER
|| opts->format == AV_CODEC_ID_AV1
#endif
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(59, 58, 100)
// This version added support for cICP tag writing
|| opts->format == AV_CODEC_ID_PNG
#endif
;
}
int image_writer_format_from_ext(const char *ext)
{
for (int n = 0; mp_image_writer_formats[n].name; n++) {
if (ext && strcmp(mp_image_writer_formats[n].name, ext) == 0)
return mp_image_writer_formats[n].value;
}
return 0;
}
static struct mp_image *convert_image(struct mp_image *image, int destfmt,
enum mp_csp_levels yuv_levels,
const struct image_writer_opts *opts,
struct mpv_global *global,
struct mp_log *log)
{
int d_w, d_h;
mp_image_params_get_dsize(&image->params, &d_w, &d_h);
struct mp_image_params p = {
.imgfmt = destfmt,
.w = d_w,
.h = d_h,
.p_w = 1,
.p_h = 1,
.color = image->params.color,
};
mp_image_params_guess_csp(&p);
if (!image_writer_flexible_csp(opts)) {
// If our format can't tag csps, set something sane
p.color.primaries = MP_CSP_PRIM_BT_709;
p.color.gamma = MP_CSP_TRC_AUTO;
p.color.light = MP_CSP_LIGHT_DISPLAY;
p.color.hdr = (struct pl_hdr_metadata){0};
if (p.color.space != MP_CSP_RGB) {
p.color.levels = yuv_levels;
p.color.space = MP_CSP_BT_601;
p.chroma_location = MP_CHROMA_CENTER;
}
mp_image_params_guess_csp(&p);
}
if (mp_image_params_equal(&p, &image->params))
return mp_image_new_ref(image);
mp_dbg(log, "will convert image to %s\n", mp_imgfmt_to_name(p.imgfmt));
struct mp_image *src = image;
if (mp_image_crop_valid(&src->params) &&
(mp_rect_w(src->params.crop) != src->w ||
mp_rect_h(src->params.crop) != src->h))
{
src = mp_image_new_ref(src);
if (!src) {
mp_err(log, "mp_image_new_ref failed!\n");
return NULL;
}
mp_image_crop_rc(src, src->params.crop);
}
struct mp_image *dst = mp_image_alloc(p.imgfmt, p.w, p.h);
if (!dst) {
mp_err(log, "Out of memory.\n");
return NULL;
}
mp_image_copy_attributes(dst, src);
dst->params = p;
struct mp_sws_context *sws = mp_sws_alloc(NULL);
sws->log = log;
if (global)
mp_sws_enable_cmdline_opts(sws, global);
bool ok = mp_sws_scale(sws, dst, src) >= 0;
talloc_free(sws);
if (src != image)
talloc_free(src);
if (!ok) {
mp_err(log, "Error when converting image.\n");
talloc_free(dst);
return NULL;
}
return dst;
}
bool write_image(struct mp_image *image, const struct image_writer_opts *opts,
const char *filename, struct mpv_global *global,
struct mp_log *log)
{
struct image_writer_opts defs = image_writer_opts_defaults;
if (!opts)
opts = &defs;
mp_dbg(log, "input: %s\n", mp_image_params_to_str(&image->params));
struct image_writer_ctx ctx = { log, opts, image->fmt };
bool (*write)(struct image_writer_ctx *, mp_image_t *, const char *) = write_lavc;
int destfmt = 0;
#if HAVE_JPEG
if (opts->format == AV_CODEC_ID_MJPEG) {
write = write_jpeg;
destfmt = IMGFMT_RGB24;
}
#endif
#if HAVE_AVIF_MUXER
if (opts->format == AV_CODEC_ID_AV1) {
write = write_avif;
destfmt = mp_imgfmt_from_name(bstr0(opts->avif_pixfmt));
}
#endif
if (opts->format == AV_CODEC_ID_WEBP && !opts->webp_lossless) {
// For lossy images, libwebp has its own RGB->YUV conversion.
// We don't want that, so force YUV/YUVA here.
int alpha = image->fmt.flags & MP_IMGFLAG_ALPHA;
destfmt = alpha ? pixfmt2imgfmt(AV_PIX_FMT_YUVA420P) : IMGFMT_420P;
}
if (!destfmt)
destfmt = get_target_format(&ctx);
enum mp_csp_levels levels; // Ignored if destfmt is a RGB format
if (opts->format == AV_CODEC_ID_WEBP) {
levels = MP_CSP_LEVELS_TV;
} else {
levels = MP_CSP_LEVELS_PC;
}
struct mp_image *dst = convert_image(image, destfmt, levels, opts, global, log);
if (!dst)
return false;
bool success = write(&ctx, dst, filename);
if (!success)
mp_err(log, "Error writing file '%s'!\n", filename);
talloc_free(dst);
return success;
}
void dump_png(struct mp_image *image, const char *filename, struct mp_log *log)
{
struct image_writer_opts opts = image_writer_opts_defaults;
opts.format = AV_CODEC_ID_PNG;
write_image(image, &opts, filename, NULL, log);
}
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