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-rw-r--r--doc/examples/encode_video.c124
1 files changed, 73 insertions, 51 deletions
diff --git a/doc/examples/encode_video.c b/doc/examples/encode_video.c
index cb128361d5..6731b2ad19 100644
--- a/doc/examples/encode_video.c
+++ b/doc/examples/encode_video.c
@@ -1,21 +1,23 @@
/*
- * copyright (c) 2001 Fabrice Bellard
+ * Copyright (c) 2001 Fabrice Bellard
*
- * This file is part of Libav.
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
*
- * Libav 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.
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
*
- * Libav 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 Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
*/
/**
@@ -29,10 +31,10 @@
#include <stdlib.h>
#include <string.h>
-#include "libavcodec/avcodec.h"
+#include <libavcodec/avcodec.h>
-#include "libavutil/frame.h"
-#include "libavutil/imgutils.h"
+#include <libavutil/opt.h>
+#include <libavutil/imgutils.h>
static void encode(AVCodecContext *enc_ctx, AVFrame *frame, AVPacket *pkt,
FILE *outfile)
@@ -40,9 +42,12 @@ static void encode(AVCodecContext *enc_ctx, AVFrame *frame, AVPacket *pkt,
int ret;
/* send the frame to the encoder */
+ if (frame)
+ printf("Send frame %3"PRId64"\n", frame->pts);
+
ret = avcodec_send_frame(enc_ctx, frame);
if (ret < 0) {
- fprintf(stderr, "error sending a frame for encoding\n");
+ fprintf(stderr, "Error sending a frame for encoding\n");
exit(1);
}
@@ -51,11 +56,11 @@ static void encode(AVCodecContext *enc_ctx, AVFrame *frame, AVPacket *pkt,
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
return;
else if (ret < 0) {
- fprintf(stderr, "error during encoding\n");
+ fprintf(stderr, "Error during encoding\n");
exit(1);
}
- printf("encoded frame %3"PRId64" (size=%5d)\n", pkt->pts, pkt->size);
+ printf("Write packet %3"PRId64" (size=%5d)\n", pkt->pts, pkt->size);
fwrite(pkt->data, 1, pkt->size, outfile);
av_packet_unref(pkt);
}
@@ -63,32 +68,34 @@ static void encode(AVCodecContext *enc_ctx, AVFrame *frame, AVPacket *pkt,
int main(int argc, char **argv)
{
- const char *filename;
+ const char *filename, *codec_name;
const AVCodec *codec;
AVCodecContext *c= NULL;
int i, ret, x, y;
FILE *f;
- AVFrame *picture;
+ AVFrame *frame;
AVPacket *pkt;
uint8_t endcode[] = { 0, 0, 1, 0xb7 };
- if (argc <= 1) {
- fprintf(stderr, "Usage: %s <output file>\n", argv[0]);
+ if (argc <= 2) {
+ fprintf(stderr, "Usage: %s <output file> <codec name>\n", argv[0]);
exit(0);
}
filename = argv[1];
-
- avcodec_register_all();
+ codec_name = argv[2];
/* find the mpeg1video encoder */
- codec = avcodec_find_encoder(AV_CODEC_ID_MPEG1VIDEO);
+ codec = avcodec_find_encoder_by_name(codec_name);
if (!codec) {
- fprintf(stderr, "codec not found\n");
+ fprintf(stderr, "Codec '%s' not found\n", codec_name);
exit(1);
}
c = avcodec_alloc_context3(codec);
- picture = av_frame_alloc();
+ if (!c) {
+ fprintf(stderr, "Could not allocate video codec context\n");
+ exit(1);
+ }
pkt = av_packet_alloc();
if (!pkt)
@@ -103,61 +110,76 @@ int main(int argc, char **argv)
c->time_base = (AVRational){1, 25};
c->framerate = (AVRational){25, 1};
- c->gop_size = 10; /* emit one intra frame every ten frames */
- c->max_b_frames=1;
+ /* emit one intra frame every ten frames
+ * check frame pict_type before passing frame
+ * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
+ * then gop_size is ignored and the output of encoder
+ * will always be I frame irrespective to gop_size
+ */
+ c->gop_size = 10;
+ c->max_b_frames = 1;
c->pix_fmt = AV_PIX_FMT_YUV420P;
+ if (codec->id == AV_CODEC_ID_H264)
+ av_opt_set(c->priv_data, "preset", "slow", 0);
+
/* open it */
- if (avcodec_open2(c, codec, NULL) < 0) {
- fprintf(stderr, "could not open codec\n");
+ ret = avcodec_open2(c, codec, NULL);
+ if (ret < 0) {
+ fprintf(stderr, "Could not open codec: %s\n", av_err2str(ret));
exit(1);
}
f = fopen(filename, "wb");
if (!f) {
- fprintf(stderr, "could not open %s\n", filename);
+ fprintf(stderr, "Could not open %s\n", filename);
exit(1);
}
- picture->format = c->pix_fmt;
- picture->width = c->width;
- picture->height = c->height;
+ frame = av_frame_alloc();
+ if (!frame) {
+ fprintf(stderr, "Could not allocate video frame\n");
+ exit(1);
+ }
+ frame->format = c->pix_fmt;
+ frame->width = c->width;
+ frame->height = c->height;
- ret = av_frame_get_buffer(picture, 32);
+ ret = av_frame_get_buffer(frame, 32);
if (ret < 0) {
- fprintf(stderr, "could not alloc the frame data\n");
+ fprintf(stderr, "Could not allocate the video frame data\n");
exit(1);
}
/* encode 1 second of video */
- for(i=0;i<25;i++) {
+ for (i = 0; i < 25; i++) {
fflush(stdout);
/* make sure the frame data is writable */
- ret = av_frame_make_writable(picture);
+ ret = av_frame_make_writable(frame);
if (ret < 0)
exit(1);
/* prepare a dummy image */
/* Y */
- for(y=0;y<c->height;y++) {
- for(x=0;x<c->width;x++) {
- picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
+ for (y = 0; y < c->height; y++) {
+ for (x = 0; x < c->width; x++) {
+ frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;
}
}
/* Cb and Cr */
- for(y=0;y<c->height/2;y++) {
- for(x=0;x<c->width/2;x++) {
- picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
- picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
+ for (y = 0; y < c->height/2; y++) {
+ for (x = 0; x < c->width/2; x++) {
+ frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2;
+ frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5;
}
}
- picture->pts = i;
+ frame->pts = i;
/* encode the image */
- encode(c, picture, pkt, f);
+ encode(c, frame, pkt, f);
}
/* flush the encoder */
@@ -168,7 +190,7 @@ int main(int argc, char **argv)
fclose(f);
avcodec_free_context(&c);
- av_frame_free(&picture);
+ av_frame_free(&frame);
av_packet_free(&pkt);
return 0;
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-30 19:03:11 +0000