想学习FFmpeg不知道如何开始，那么这个项目是为你准备的，使用过binary执行ffmpeg吗，那么本项目就是为你准备的进阶教程.
use this library you can do all the things with ffmepg ex: video crop ,video filter ,video stream dump and so on .
use ffmpeg as the binary file use commands params to run main funcition , picture and videos acitons as you licke.
-
Transcode flv->mp4
-
Dump RTSP live Stream to Android SDcard/xx.mp4 file .
-
gif/image merge and so on .
-
配置maven
allprojects {
repositories {
maven { url 'https://repo1.maven.org/maven2/'}
google()
jcenter()
}
}
- 引用 32位
implementation 'io.github.jdpxiaoming:ffmpeg-cmd:0.0.15'- 64位
the java code in ffmpeg-cmd(32bit) lib,so if you must include ffmpeg-cmd and ffmpeg-cmd64 if you want use arm64 so, then you can choose your arm abi :arm64-v8a
implementation 'io.github.jdpxiaoming:ffmpeg-cmd64:0.0.15'- 编译64位需要修改
ffmpeg/config.h
#define ARCH_AARCH64 1
#define ARCH_ARM 0- example:
String inputPath = Environment.getExternalStorageDirectory().getAbsolutePath()+"/Download/58.flv";
String outputPath = Environment.getExternalStorageDirectory().getAbsolutePath()+"/Download/61.mp4";
File input =new File(inputPath);
if(!input.exists()){
Toast.makeText(MainActivity.this, "/Download/58.flv not found!", Toast.LENGTH_LONG).show();
return;
}
File output =new File(outputPath);
if(output.exists()){
output.delete();
}
//cmds for ffmpeg flv->mp4.
inputPath ="rtsp://47.108.81.159:5555/rtsp/992949a2-4d57-439f-8afb-9d940a13d786";
String[] commands = FFmpegFactory.buildRtsp2Mp4(inputPath,outputPath);
FFmpegUtil.getInstance().enQueueTask(commands, 0,new FFmpegUtil.onCallBack() {
@Override
public void onStart() {
Log.i(TAG," onStart2 # ");
}
@Override
public void onFailure() {
Log.i(TAG," onFailure2 # ");
}
@Override
public void onComplete() {
Log.i(TAG," onComplete2 # ");
Toast.makeText(MainActivity.this, "transcode successful2!", Toast.LENGTH_LONG).show();
}
@Override
public void onProgress(float progress) {
Log.i(TAG," onProgress2 # "+progress);
}
});
public void dumpFlv(View view) {
String input = "http://118.31.174.18:5581/rtmp/8e5196c4-e7d9-41b0-9080-fa0da638d9e2/live.flv";
String output = new File(Environment.getExternalStorageDirectory(),"/poe/output61.mp4").getAbsolutePath();
FFmpegCmd.dump_stream(input , output);
}
-
和上面的区别：
使用jni代码调用方式dump各种直播流为本地Mp4. -
remuxing.c(来源于编译库后官方demo 目录/share,你也可以在本项目/docs/examples查看)
/*
* Copyright (c) 2013 Stefano Sabatini
*
* 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:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* 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.
*/
/**
* @file
* libavformat/libavcodec demuxing and muxing API example.
*
* Remux streams from one container format to another.
* @example remuxing.c
*/
#include <libavutil/timestamp.h>
#include <libavformat/avformat.h>
static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt, const char *tag)
{
AVRational *time_base = &fmt_ctx->streams[pkt->stream_index]->time_base;
printf("%s: pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n",
tag,
av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, time_base),
av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, time_base),
av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, time_base),
pkt->stream_index);
}
int main(int argc, char **argv)
{
AVOutputFormat *ofmt = NULL;
AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
AVPacket pkt;
const char *in_filename, *out_filename;
int ret, i;
int stream_index = 0;
int *stream_mapping = NULL;
int stream_mapping_size = 0;
if (argc < 3) {
printf("usage: %s input output\n"
"API example program to remux a media file with libavformat and libavcodec.\n"
"The output format is guessed according to the file extension.\n"
"\n", argv[0]);
return 1;
}
// get the input path .
in_filename = argv[1];
// get the output path .
out_filename = argv[2];
//use avformat to open the input file .
if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {
fprintf(stderr, "Could not open input file '%s'", in_filename);
goto end;
}
//get stream head info from the av_format_context: ifmt_ctx .
if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
fprintf(stderr, "Failed to retrieve input stream information");
goto end;
}
//check the input foramt protocal ? rtsp/file/http/htts/rtmp? .
//no , it is an log print to console .and so on .
av_dump_format(ifmt_ctx, 0, in_filename, 0);
//init the output AvformatCotnext with out_filename.
avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);
if (!ofmt_ctx) {
fprintf(stderr, "Could not create output context\n");
ret = AVERROR_UNKNOWN;
goto end;
}
// get he input streams count , video /audio .
stream_mapping_size = ifmt_ctx->nb_streams;
stream_mapping = av_mallocz_array(stream_mapping_size, sizeof(*stream_mapping));
if (!stream_mapping) {
ret = AVERROR(ENOMEM);
goto end;
}
//init the AVOutputFormat by avformatcontext .
ofmt = ofmt_ctx->oformat;
//test audio or video stream . write the codecparinfo to outfile .
for (i = 0; i < ifmt_ctx->nb_streams; i++) {
AVStream *out_stream;
AVStream *in_stream = ifmt_ctx->streams[i];
AVCodecParameters *in_codecpar = in_stream->codecpar;
//filter useless streams .
if (in_codecpar->codec_type != AVMEDIA_TYPE_AUDIO &&
in_codecpar->codec_type != AVMEDIA_TYPE_VIDEO &&
in_codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) {
stream_mapping[i] = -1;
continue;
}
stream_mapping[i] = stream_index++;
//create an output stream . maybe fileStream.
out_stream = avformat_new_stream(ofmt_ctx, NULL);
if (!out_stream) {
fprintf(stderr, "Failed allocating output stream\n");
ret = AVERROR_UNKNOWN;
goto end;
}
//copy the codepar from inputStream to the target outputStream .
ret = avcodec_parameters_copy(out_stream->codecpar, in_codecpar);
if (ret < 0) {
fprintf(stderr, "Failed to copy codec parameters\n");
goto end;
}
out_stream->codecpar->codec_tag = 0;
}
//print output streawm codec info to file or console.
av_dump_format(ofmt_ctx, 0, out_filename, 1);
//open output file failed .
if (!(ofmt->flags & AVFMT_NOFILE)) {
ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);
if (ret < 0) {
fprintf(stderr, "Could not open output file '%s'", out_filename);
goto end;
}
}
//write file header ex:Mp4 head info .
ret = avformat_write_header(ofmt_ctx, NULL);
if (ret < 0) {
fprintf(stderr, "Error occurred when opening output file\n");
goto end;
}
//open a looper .
while (1) {
AVStream *in_stream, *out_stream;
//get AVPacket .
ret = av_read_frame(ifmt_ctx, &pkt);
if (ret < 0)
break;
//get the input stream .
in_stream = ifmt_ctx->streams[pkt.stream_index];
//filter dity data stream.
if (pkt.stream_index >= stream_mapping_size ||
stream_mapping[pkt.stream_index] < 0) {
av_packet_unref(&pkt);
continue;
}
pkt.stream_index = stream_mapping[pkt.stream_index];
out_stream = ofmt_ctx->streams[pkt.stream_index];
//log the stream info to console.
log_packet(ifmt_ctx, &pkt, "in");
/* copy packet */
//caculate the time base of dpts & dts ,duration and pos . if mp4 has pos .
pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
pkt.pos = -1;
log_packet(ofmt_ctx, &pkt, "out");
//exec write frame work .
//往输出流中写一个分包
ret = av_interleaved_write_frame(ofmt_ctx, &pkt);
if (ret < 0) {
fprintf(stderr, "Error muxing packet\n");
break;
}
av_packet_unref(&pkt);
}
//write the file end trailer .
//写输出流（文件）的文件尾
av_write_trailer(ofmt_ctx);
end:
avformat_close_input(&ifmt_ctx);
/* close output */
if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
avio_closep(&ofmt_ctx->pb);
avformat_free_context(ofmt_ctx);
av_freep(&stream_mapping);
if (ret < 0 && ret != AVERROR_EOF) {
fprintf(stderr, "Error occurred: %s\n", av_err2str(ret));
return 1;
}
return 0;
}