Feature: transcode media file

app/CMakeLists.txt

@@ -43,6 +43,7 @@ add_library( # Sets the name of the library.
             src/main/cpp/metadata/metadata_util.c
             src/main/cpp/metadata/ffmpeg_media_retriever.c
             src/main/cpp/yuv/yuv_converter.cpp
+            src/main/cpp/media_transcode.cpp
         )
 
 add_library( ffmpeg

app/src/main/cpp/media_transcode.cpp

@@ -0,0 +1,616 @@
+//
+// Created by xu fulong on 2022/7/11.
+//
+
+#include <jni.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#include <libavcodec/avcodec.h>
+#include <libavformat/avformat.h>
+#include <libavfilter/buffersink.h>
+#include <libavfilter/buffersrc.h>
+#include <libavutil/opt.h>
+#include <libavutil/pixdesc.h>
+#ifdef __cplusplus
+}
+#endif
+
+#include "ffmpeg_jni_define.h"
+
+#define ALOGE(Format, ...) LOGE("Transcde", Format, ##__VA_ARGS__)
+
+static AVFormatContext *ifmt_ctx;
+static AVFormatContext *ofmt_ctx;
+typedef struct FilteringContext {
+    AVFilterContext *buffersink_ctx;
+    AVFilterContext *buffersrc_ctx;
+    AVFilterGraph *filter_graph;
+} FilteringContext;
+static FilteringContext *filter_ctx;
+
+typedef struct StreamContext {
+    AVCodecContext *dec_ctx;
+    AVCodecContext *enc_ctx;
+} StreamContext;
+static StreamContext *stream_ctx;
+
+static int open_input_file(const char *filename)
+{
+    int ret;
+    unsigned int i;
+    ifmt_ctx = nullptr;
+
+    if ((ret = avformat_open_input(&ifmt_ctx, filename, nullptr, nullptr)) < 0) {
+        ALOGE("Cannot open input file\n");
+        return ret;
+    }
+
+    if ((ret = avformat_find_stream_info(ifmt_ctx, nullptr)) < 0) {
+        ALOGE("Cannot find stream information\n");
+        return ret;
+    }
+
+    stream_ctx = static_cast<StreamContext *>(av_mallocz_array(ifmt_ctx->nb_streams,
+                                                               sizeof(*stream_ctx)));
+    if (!stream_ctx)
+        return AVERROR(ENOMEM);
+
+    for (i = 0; i < ifmt_ctx->nb_streams; i++) {
+        AVStream *stream = ifmt_ctx->streams[i];
+        AVCodec *dec = avcodec_find_decoder(stream->codecpar->codec_id);
+        AVCodecContext *codec_ctx;
+        if (!dec) {
+            ALOGE("Failed to find decoder for stream #%u\n", i);
+            return AVERROR_DECODER_NOT_FOUND;
+        }
+        codec_ctx = avcodec_alloc_context3(dec);
+        if (!codec_ctx) {
+            ALOGE("Failed to allocate the decoder context for stream #%u\n", i);
+            return AVERROR(ENOMEM);
+        }
+        ret = avcodec_parameters_to_context(codec_ctx, stream->codecpar);
+        if (ret < 0) {
+            ALOGE("Failed to copy decoder parameters to input decoder context "
+                                       "for stream #%u\n", i);
+            return ret;
+        }
+        /* Reencode video & audio and remux subtitles etc. */
+        if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
+            || codec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
+            if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO)
+                codec_ctx->framerate = av_guess_frame_rate(ifmt_ctx, stream, nullptr);
+            /* Open decoder */
+            ret = avcodec_open2(codec_ctx, dec, nullptr);
+            if (ret < 0) {
+                ALOGE("Failed to open decoder for stream #%u\n", i);
+                return ret;
+            }
+        }
+        stream_ctx[i].dec_ctx = codec_ctx;
+    }
+
+    av_dump_format(ifmt_ctx, 0, filename, 0);
+    return 0;
+}
+
+static int open_output_file(const char *filename)
+{
+    AVStream *out_stream;
+    AVStream *in_stream;
+    AVCodecContext *dec_ctx, *enc_ctx;
+    AVCodec *encoder;
+    int ret;
+    unsigned int i;
+
+    ofmt_ctx = nullptr;
+    avformat_alloc_output_context2(&ofmt_ctx, nullptr, nullptr, filename);
+    if (!ofmt_ctx) {
+        ALOGE("Could not create output context\n");
+        return AVERROR_UNKNOWN;
+    }
+
+    for (i = 0; i < ifmt_ctx->nb_streams; i++) {
+        out_stream = avformat_new_stream(ofmt_ctx, nullptr);
+        if (!out_stream) {
+            ALOGE("Failed allocating output stream\n");
+            return AVERROR_UNKNOWN;
+        }
+
+        in_stream = ifmt_ctx->streams[i];
+        dec_ctx = stream_ctx[i].dec_ctx;
+
+        if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
+            || dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
+            /* in this example, we choose transcoding to same codec */
+            encoder = avcodec_find_encoder(dec_ctx->codec_id);
+            if (!encoder) {
+                ALOGE("Necessary encoder not found\n");
+                return AVERROR_INVALIDDATA;
+            }
+            enc_ctx = avcodec_alloc_context3(encoder);
+            if (!enc_ctx) {
+                ALOGE("Failed to allocate the encoder context\n");
+                return AVERROR(ENOMEM);
+            }
+
+            /* In this example, we transcode to same properties (picture size,
+             * sample rate etc.). These properties can be changed for output
+             * streams easily using filters */
+            if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
+                enc_ctx->height = dec_ctx->height;
+                enc_ctx->width = dec_ctx->width;
+                enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio;
+                /* take first format from list of supported formats */
+                if (encoder->pix_fmts)
+                    enc_ctx->pix_fmt = encoder->pix_fmts[0];
+                else
+                    enc_ctx->pix_fmt = dec_ctx->pix_fmt;
+                /* video time_base can be set to whatever is handy and supported by encoder */
+                enc_ctx->time_base = av_inv_q(dec_ctx->framerate);
+            } else {
+                enc_ctx->sample_rate = dec_ctx->sample_rate;
+                enc_ctx->channel_layout = dec_ctx->channel_layout;
+                enc_ctx->channels = av_get_channel_layout_nb_channels(enc_ctx->channel_layout);
+                /* take first format from list of supported formats */
+                enc_ctx->sample_fmt = encoder->sample_fmts[0];
+                enc_ctx->time_base = (AVRational){1, enc_ctx->sample_rate};
+            }
+
+            if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
+                enc_ctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
+
+            /* Third parameter can be used to pass settings to encoder */
+            ret = avcodec_open2(enc_ctx, encoder, nullptr);
+            if (ret < 0) {
+                ALOGE("Cannot open video encoder for stream #%u\n", i);
+                return ret;
+            }
+            ret = avcodec_parameters_from_context(out_stream->codecpar, enc_ctx);
+            if (ret < 0) {
+                ALOGE("Failed to copy encoder parameters to output stream #%u\n", i);
+                return ret;
+            }
+
+            out_stream->time_base = enc_ctx->time_base;
+            stream_ctx[i].enc_ctx = enc_ctx;
+        } else if (dec_ctx->codec_type == AVMEDIA_TYPE_UNKNOWN) {
+            ALOGE("Elementary stream #%d is of unknown type, cannot proceed\n", i);
+            return AVERROR_INVALIDDATA;
+        } else {
+            /* if this stream must be remuxed */
+            ret = avcodec_parameters_copy(out_stream->codecpar, in_stream->codecpar);
+            if (ret < 0) {
+                ALOGE("Copying parameters for stream #%u failed\n", i);
+                return ret;
+            }
+            out_stream->time_base = in_stream->time_base;
+        }
+
+    }
+    av_dump_format(ofmt_ctx, 0, filename, 1);
+
+    if (!(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) {
+        ret = avio_open(&ofmt_ctx->pb, filename, AVIO_FLAG_WRITE);
+        if (ret < 0) {
+            ALOGE("Could not open output file '%s'", filename);
+            return ret;
+        }
+    }
+
+    /* init muxer, write output file header */
+    ret = avformat_write_header(ofmt_ctx, nullptr);
+    if (ret < 0) {
+        ALOGE("Error occurred when opening output file\n");
+        return ret;
+    }
+
+    return 0;
+}
+
+static int init_filter(FilteringContext* fctx, AVCodecContext *dec_ctx,
+                       AVCodecContext *enc_ctx, const char *filter_spec)
+{
+    char args[512];
+    int ret;
+    const AVFilter *buffersrc;
+    const AVFilter *buffersink;
+    AVFilterContext *buffersrc_ctx = nullptr;
+    AVFilterContext *buffersink_ctx = nullptr;
+    AVFilterInOut *outputs = avfilter_inout_alloc();
+    AVFilterInOut *inputs  = avfilter_inout_alloc();
+    AVFilterGraph *filter_graph = avfilter_graph_alloc();
+
+    if (!outputs || !inputs || !filter_graph) {
+        ret = AVERROR(ENOMEM);
+        goto end;
+    }
+
+    if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
+        buffersrc = avfilter_get_by_name("buffer");
+        buffersink = avfilter_get_by_name("buffersink");
+        if (!buffersrc || !buffersink) {
+            ALOGE("filtering source or sink element not found\n");
+            ret = AVERROR_UNKNOWN;
+            goto end;
+        }
+
+        snprintf(args, sizeof(args),
+                 "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
+                 dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt,
+                 dec_ctx->time_base.num, dec_ctx->time_base.den,
+                 dec_ctx->sample_aspect_ratio.num,
+                 dec_ctx->sample_aspect_ratio.den);
+
+        ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
+                                           args, nullptr, filter_graph);
+        if (ret < 0) {
+            ALOGE("Cannot create buffer source\n");
+            goto end;
+        }
+
+        ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
+                                           nullptr, nullptr, filter_graph);
+        if (ret < 0) {
+            ALOGE("Cannot create buffer sink\n");
+            goto end;
+        }
+
+        ret = av_opt_set_bin(buffersink_ctx, "pix_fmts",
+                             (uint8_t*)&enc_ctx->pix_fmt, sizeof(enc_ctx->pix_fmt),
+                             AV_OPT_SEARCH_CHILDREN);
+        if (ret < 0) {
+            ALOGE( "Cannot set output pixel format\n");
+            goto end;
+        }
+    } else if (dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
+        buffersrc = avfilter_get_by_name("abuffer");
+        buffersink = avfilter_get_by_name("abuffersink");
+        if (!buffersrc || !buffersink) {
+            ALOGE( "filtering source or sink element not found\n");
+            ret = AVERROR_UNKNOWN;
+            goto end;
+        }
+
+        if (!dec_ctx->channel_layout)
+            dec_ctx->channel_layout =
+                    av_get_default_channel_layout(dec_ctx->channels);
+        snprintf(args, sizeof(args),
+                 "time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%" PRIx64,
+                 dec_ctx->time_base.num, dec_ctx->time_base.den, dec_ctx->sample_rate,
+                 av_get_sample_fmt_name(dec_ctx->sample_fmt),
+                 dec_ctx->channel_layout);
+        ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
+                                           args, nullptr, filter_graph);
+        if (ret < 0) {
+            ALOGE("Cannot create audio buffer source\n");
+            goto end;
+        }
+
+        ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
+                                           nullptr, nullptr, filter_graph);
+        if (ret < 0) {
+            ALOGE("Cannot create audio buffer sink\n");
+            goto end;
+        }
+
+        ret = av_opt_set_bin(buffersink_ctx, "sample_fmts",
+                             (uint8_t*)&enc_ctx->sample_fmt, sizeof(enc_ctx->sample_fmt),
+                             AV_OPT_SEARCH_CHILDREN);
+        if (ret < 0) {
+            ALOGE("Cannot set output sample format\n");
+            goto end;
+        }
+
+        ret = av_opt_set_bin(buffersink_ctx, "channel_layouts",
+                             (uint8_t*)&enc_ctx->channel_layout,
+                             sizeof(enc_ctx->channel_layout), AV_OPT_SEARCH_CHILDREN);
+        if (ret < 0) {
+            ALOGE("Cannot set output channel layout\n");
+            goto end;
+        }
+
+        ret = av_opt_set_bin(buffersink_ctx, "sample_rates",
+                             (uint8_t*)&enc_ctx->sample_rate, sizeof(enc_ctx->sample_rate),
+                             AV_OPT_SEARCH_CHILDREN);
+        if (ret < 0) {
+            ALOGE("Cannot set output sample rate\n");
+            goto end;
+        }
+    } else {
+        ret = AVERROR_UNKNOWN;
+        goto end;
+    }
+
+    /* Endpoints for the filter graph. */
+    outputs->name       = av_strdup("in");
+    outputs->filter_ctx = buffersrc_ctx;
+    outputs->pad_idx    = 0;
+    outputs->next       = nullptr;
+
+    inputs->name       = av_strdup("out");
+    inputs->filter_ctx = buffersink_ctx;
+    inputs->pad_idx    = 0;
+    inputs->next       = nullptr;
+
+    if (!outputs->name || !inputs->name) {
+        ret = AVERROR(ENOMEM);
+        goto end;
+    }
+
+    if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec,
+                                        &inputs, &outputs, nullptr)) < 0)
+        goto end;
+
+    if ((ret = avfilter_graph_config(filter_graph, nullptr)) < 0)
+        goto end;
+
+    /* Fill FilteringContext */
+    fctx->filter_graph = filter_graph;
+    fctx->buffersrc_ctx = buffersrc_ctx;
+    fctx->buffersink_ctx = buffersink_ctx;
+
+end:
+    avfilter_inout_free(&inputs);
+    avfilter_inout_free(&outputs);
+
+    return ret;
+}
+
+static int init_filters()
+{
+    const char *filter_spec;
+    unsigned int i;
+    int ret;
+    filter_ctx = static_cast<FilteringContext *>(av_malloc_array(ifmt_ctx->nb_streams,
+                                                                 sizeof(*filter_ctx)));
+    if (!filter_ctx)
+        return AVERROR(ENOMEM);
+
+    for (i = 0; i < ifmt_ctx->nb_streams; i++) {
+        filter_ctx[i].buffersrc_ctx  = nullptr;
+        filter_ctx[i].buffersink_ctx = nullptr;
+        filter_ctx[i].filter_graph   = nullptr;
+        if (!(ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
+              || ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO))
+            continue;
+
+
+        if (ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
+            filter_spec = "null";
+        else
+            filter_spec = "anull";
+        ret = init_filter(&filter_ctx[i], stream_ctx[i].dec_ctx,
+                          stream_ctx[i].enc_ctx, filter_spec);
+        if (ret)
+            return ret;
+    }
+    return 0;
+}
+
+static int encode_write_frame(AVFrame *filt_frame, unsigned int stream_index, int *got_frame) {
+    int ret;
+    int got_frame_local;
+    AVPacket enc_pkt;
+    int (*enc_func)(AVCodecContext *, AVPacket *, const AVFrame *, int *) =
+    (ifmt_ctx->streams[stream_index]->codecpar->codec_type ==
+     AVMEDIA_TYPE_VIDEO) ? avcodec_encode_video2 : avcodec_encode_audio2;
+
+    if (!got_frame)
+        got_frame = &got_frame_local;
+
+    ALOGE("Encoding frame\n");
+    /* encode filtered frame */
+    enc_pkt.data = nullptr;
+    enc_pkt.size = 0;
+    av_init_packet(&enc_pkt);
+    ret = enc_func(stream_ctx[stream_index].enc_ctx, &enc_pkt,
+                   filt_frame, got_frame);
+    av_frame_free(&filt_frame);
+    if (ret < 0)
+        return ret;
+    if (!(*got_frame))
+        return 0;
+
+    /* prepare packet for muxing */
+    enc_pkt.stream_index = stream_index;
+    av_packet_rescale_ts(&enc_pkt,
+                         stream_ctx[stream_index].enc_ctx->time_base,
+                         ofmt_ctx->streams[stream_index]->time_base);
+
+    ALOGE("Muxing frame\n");
+    /* mux encoded frame */
+    ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt);
+    return ret;
+}
+
+static int filter_encode_write_frame(AVFrame *frame, unsigned int stream_index)
+{
+    int ret;
+    AVFrame *filt_frame;
+
+    ALOGE("Pushing decoded frame to filters\n");
+    /* push the decoded frame into the filtergraph */
+    ret = av_buffersrc_add_frame_flags(filter_ctx[stream_index].buffersrc_ctx,
+                                       frame, 0);
+    if (ret < 0) {
+        ALOGE("Error while feeding the filtergraph\n");
+        return ret;
+    }
+
+    /* pull filtered frames from the filtergraph */
+    while (1) {
+        filt_frame = av_frame_alloc();
+        if (!filt_frame) {
+            ret = AVERROR(ENOMEM);
+            break;
+        }
+        ALOGE("Pulling filtered frame from filters\n");
+        ret = av_buffersink_get_frame(filter_ctx[stream_index].buffersink_ctx,
+                                      filt_frame);
+        if (ret < 0) {
+            /* if no more frames for output - returns AVERROR(EAGAIN)
+             * if flushed and no more frames for output - returns AVERROR_EOF
+             * rewrite retcode to 0 to show it as normal procedure completion
+             */
+            if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
+                ret = 0;
+            av_frame_free(&filt_frame);
+            break;
+        }
+
+        filt_frame->pict_type = AV_PICTURE_TYPE_NONE;
+        ret = encode_write_frame(filt_frame, stream_index, nullptr);
+        if (ret < 0)
+            break;
+    }
+
+    return ret;
+}
+
+static int flush_encoder(unsigned int stream_index)
+{
+    int ret;
+    int got_frame;
+
+    if (!(stream_ctx[stream_index].enc_ctx->codec->capabilities &
+          AV_CODEC_CAP_DELAY))
+        return 0;
+
+    while (1) {
+        ALOGE("Flushing stream #%u encoder\n", stream_index);
+        ret = encode_write_frame(nullptr, stream_index, &got_frame);
+        if (ret < 0)
+            break;
+        if (!got_frame)
+            return 0;
+    }
+    return ret;
+}
+
+int transcode(const char *input_file, const char *output_file)
+{
+    int ret;
+    AVPacket packet = { .data = nullptr, .size = 0 };
+    AVFrame *frame = nullptr;
+    enum AVMediaType type;
+    unsigned int stream_index;
+    unsigned int i;
+    int got_frame;
+    int (*dec_func)(AVCodecContext *, AVFrame *, int *, const AVPacket *);
+
+    if ((ret = open_input_file(input_file)) < 0)
+        goto end;
+    if ((ret = open_output_file(output_file)) < 0)
+        goto end;
+    if ((ret = init_filters()) < 0)
+        goto end;
+
+    /* read all packets */
+    while (1) {
+        if ((ret = av_read_frame(ifmt_ctx, &packet)) < 0)
+            break;
+        stream_index = packet.stream_index;
+        type = ifmt_ctx->streams[packet.stream_index]->codecpar->codec_type;
+        ALOGE("Demuxer gave frame of stream_index %u\n",
+               stream_index);
+
+        if (filter_ctx[stream_index].filter_graph) {
+            ALOGE("Going to re-encode&filter the frame\n");
+            frame = av_frame_alloc();
+            if (!frame) {
+                ret = AVERROR(ENOMEM);
+                break;
+            }
+            av_packet_rescale_ts(&packet,
+                                 ifmt_ctx->streams[stream_index]->time_base,
+                                 stream_ctx[stream_index].dec_ctx->time_base);
+            dec_func = (type == AVMEDIA_TYPE_VIDEO) ? avcodec_decode_video2 : avcodec_decode_audio4;
+            ret = dec_func(stream_ctx[stream_index].dec_ctx, frame,
+                           &got_frame, &packet);
+            if (ret < 0) {
+                av_frame_free(&frame);
+                ALOGE("Decoding failed\n");
+                break;
+            }
+
+            if (got_frame) {
+                frame->pts = frame->best_effort_timestamp;
+                ret = filter_encode_write_frame(frame, stream_index);
+                av_frame_free(&frame);
+                if (ret < 0)
+                    goto end;
+            } else {
+                av_frame_free(&frame);
+            }
+        } else {
+            /* remux this frame without re-encoding */
+            av_packet_rescale_ts(&packet,
+                                 ifmt_ctx->streams[stream_index]->time_base,
+                                 ofmt_ctx->streams[stream_index]->time_base);
+
+            ret = av_interleaved_write_frame(ofmt_ctx, &packet);
+            if (ret < 0)
+                goto end;
+        }
+        av_packet_unref(&packet);
+    }
+
+    /* flush filters and encoders */
+    for (i = 0; i < ifmt_ctx->nb_streams; i++) {
+        /* flush filter */
+        if (!filter_ctx[i].filter_graph)
+            continue;
+        ret = filter_encode_write_frame(nullptr, i);
+        if (ret < 0) {
+            ALOGE("Flushing filter failed\n");
+            goto end;
+        }
+
+        /* flush encoder */
+        ret = flush_encoder(i);
+        if (ret < 0) {
+            ALOGE("Flushing encoder failed\n");
+            goto end;
+        }
+    }
+
+    av_write_trailer(ofmt_ctx);
+end:
+    av_packet_unref(&packet);
+    av_frame_free(&frame);
+    for (i = 0; i < ifmt_ctx->nb_streams; i++) {
+        avcodec_free_context(&stream_ctx[i].dec_ctx);
+        if (ofmt_ctx && ofmt_ctx->nb_streams > i && ofmt_ctx->streams[i] && stream_ctx[i].enc_ctx)
+            avcodec_free_context(&stream_ctx[i].enc_ctx);
+        if (filter_ctx && filter_ctx[i].filter_graph)
+            avfilter_graph_free(&filter_ctx[i].filter_graph);
+    }
+    av_free(filter_ctx);
+    av_free(stream_ctx);
+    avformat_close_input(&ifmt_ctx);
+    if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE))
+        avio_closep(&ofmt_ctx->pb);
+    avformat_free_context(ofmt_ctx);
+
+    if (ret < 0)
+        ALOGE("Error occurred: %s\n", av_err2str(ret));
+
+    return ret ? 1 : 0;
+}
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+VIDEO_PLAYER_FUNC(int, executeTranscode, jstring inputFile, jstring outputFile) {
+    const char *input_file = env->GetStringUTFChars(inputFile, JNI_FALSE);
+    const char *output_file = env->GetStringUTFChars(outputFile, JNI_FALSE);
+    int ret = transcode(input_file, output_file);
+    env->ReleaseStringUTFChars(inputFile, input_file);
+    env->ReleaseStringUTFChars(outputFile, output_file);
+    return ret;
+}
+#ifdef __cplusplus
+}
+#endif

app/src/main/java/com/frank/ffmpeg/VideoPlayer.java

@@ -26,6 +26,8 @@ public class VideoPlayer {
 
     public native void playAudio(boolean play);
 
+    public native int executeTranscode(String inputFile, String outputFile);
+
     /**
      * Create an AudioTrack instance for JNI calling
      *