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25 * libavformat/libavcodec demuxing and muxing API example.
27 * Remux streams from one container format to another.
31 #include <libavutil/timestamp.h>
32 #include <libavformat/avformat.h>
34 static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt, const char *tag)
36 AVRational *time_base = &fmt_ctx->streams[pkt->stream_index]->time_base;
38 printf("%s: pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n",
40 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, time_base),
41 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, time_base),
42 av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, time_base),
46 int main(int argc, char **argv)
48 AVOutputFormat *ofmt = NULL;
49 AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
51 const char *in_filename, *out_filename;
54 int *stream_mapping = NULL;
55 int stream_mapping_size = 0;
58 printf("usage: %s input output\n"
59 "API example program to remux a media file with libavformat and libavcodec.\n"
60 "The output format is guessed according to the file extension.\n"
65 in_filename = argv[1];
66 out_filename = argv[2];
70 if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {
71 fprintf(stderr, "Could not open input file '%s'", in_filename);
75 if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
76 fprintf(stderr, "Failed to retrieve input stream information");
80 av_dump_format(ifmt_ctx, 0, in_filename, 0);
82 avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);
84 fprintf(stderr, "Could not create output context\n");
85 ret = AVERROR_UNKNOWN;
89 stream_mapping_size = ifmt_ctx->nb_streams;
90 stream_mapping = av_mallocz_array(stream_mapping_size, sizeof(*stream_mapping));
91 if (!stream_mapping) {
92 ret = AVERROR(ENOMEM);
96 ofmt = ofmt_ctx->oformat;
98 for (i = 0; i < ifmt_ctx->nb_streams; i++) {
100 AVStream *in_stream = ifmt_ctx->streams[i];
101 AVCodecParameters *in_codecpar = in_stream->codecpar;
103 if (in_codecpar->codec_type != AVMEDIA_TYPE_AUDIO &&
104 in_codecpar->codec_type != AVMEDIA_TYPE_VIDEO &&
105 in_codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) {
106 stream_mapping[i] = -1;
110 stream_mapping[i] = stream_index++;
112 out_stream = avformat_new_stream(ofmt_ctx, NULL);
114 fprintf(stderr, "Failed allocating output stream\n");
115 ret = AVERROR_UNKNOWN;
119 ret = avcodec_parameters_copy(out_stream->codecpar, in_codecpar);
121 fprintf(stderr, "Failed to copy codec parameters\n");
124 out_stream->codecpar->codec_tag = 0;
126 av_dump_format(ofmt_ctx, 0, out_filename, 1);
128 if (!(ofmt->flags & AVFMT_NOFILE)) {
129 ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);
131 fprintf(stderr, "Could not open output file '%s'", out_filename);
136 ret = avformat_write_header(ofmt_ctx, NULL);
138 fprintf(stderr, "Error occurred when opening output file\n");
143 AVStream *in_stream, *out_stream;
145 ret = av_read_frame(ifmt_ctx, &pkt);
149 in_stream = ifmt_ctx->streams[pkt.stream_index];
150 if (pkt.stream_index >= stream_mapping_size ||
151 stream_mapping[pkt.stream_index] < 0) {
152 av_packet_unref(&pkt);
156 pkt.stream_index = stream_mapping[pkt.stream_index];
157 out_stream = ofmt_ctx->streams[pkt.stream_index];
158 log_packet(ifmt_ctx, &pkt, "in");
161 pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
162 pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
163 pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
165 log_packet(ofmt_ctx, &pkt, "out");
167 ret = av_interleaved_write_frame(ofmt_ctx, &pkt);
169 fprintf(stderr, "Error muxing packet\n");
172 av_packet_unref(&pkt);
175 av_write_trailer(ofmt_ctx);
178 avformat_close_input(&ifmt_ctx);
181 if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
182 avio_closep(&ofmt_ctx->pb);
183 avformat_free_context(ofmt_ctx);
185 av_freep(&stream_mapping);
187 if (ret < 0 && ret != AVERROR_EOF) {
188 fprintf(stderr, "Error occurred: %s\n", av_err2str(ret));