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Corona Radiata
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ffmpeg commands execution failed when run from Java. Executed successfully when the command is run in the terminal
28 septembre 2022, par Kaung Myat KhaingI'm working on a java project which works with audio file manipulation(I'm newbie to Java). I want to get the start and end time of silence in the audio with ffmpeg "silencedetect" audio filter and write the results to a text file.
I run the filter command within the following function, but it always result in failure(prints "Silence Detection failed"). Then, I tried running the command in the terminal and it was successful(prints "Silence Detection successful"). I don't know what's wrong with my java code. I have other functions which execute other ffmpeg commands with the same flow as provided, but they works fine.
Here's the function.


public static void getSilence(String filePath) throws InterruptedException, IOException {
 // detect silence
 System.out.println("Silence Detection cmd: ffmpeg -i " + filePath
 + " -af silencedetect=d=1:noise=-60dB -f null - |& awk '/silencedetect/ {print $4,$5}' > "
 + SOURCE_PATH + "/silence_detections/silenceInfo.txt");
 Process silenceDetect = Runtime.getRuntime().exec("ffmpeg -i " + filePath
 + " -af silencedetect=d=1:noise=-60dB -f null - |& awk '/silencedetect/ {print $4,$5}' > "
 + SOURCE_PATH + "/silence_detections/silenceInfo.txt");

 if (silenceDetect.waitFor() == 0) {
 System.out.println("Silence Detection successful");
 } else System.out.println("Silence Detection failed");
 }


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Failed to play m3u8 stream continously with ffmpeg APIs
7 novembre 2024, par wangt13I am working on an embedded Linux system (5.10.24), where I want to play m3u8 audio stream with FFMPEG APIs.


Here is my code.


#include 
#include 
#include <alsa></alsa>asoundlib.h>

#include <libswresample></libswresample>swresample.h>
#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
#include <libswscale></libswscale>swscale.h>

int init_pcm_play(snd_pcm_t **playback_handle,snd_pcm_uframes_t chunk_size,unsigned int rate,int bits_per_sample,int channels)
{
 snd_pcm_hw_params_t *hw_params;
 snd_pcm_format_t format;

 //1. openPCM，
 if (0 > snd_pcm_open(playback_handle, "default", SND_PCM_STREAM_PLAYBACK, 0))
 {
 printf("snd_pcm_open err\n");
 return -1;
 }
 //2. snd_pcm_hw_params_t
 if(0 > snd_pcm_hw_params_malloc (&hw_params))
 {
 printf("snd_pcm_hw_params_malloc err\n");
 return -1;
 }
 //3. hw_params
 if(0 > snd_pcm_hw_params_any (*playback_handle, hw_params))
 {
 printf("snd_pcm_hw_params_any err\n");
 return -1;
 }
 //4.
 if (0 > snd_pcm_hw_params_set_access (*playback_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED))
 {
 printf("snd_pcm_hw_params_any err\n");
 return -1;
 }

 //5. SND_PCM_FORMAT_U8,8
 if(8 == bits_per_sample) {
 format = SND_PCM_FORMAT_U8;
 }
 if(16 == bits_per_sample) {
 format = SND_PCM_FORMAT_S16_LE;
 }
 if (0 > snd_pcm_hw_params_set_format (*playback_handle, hw_params, format))
 {
 printf("snd_pcm_hw_params_set_format err\n");
 return -1;
 }

 //6.
 if (0 > snd_pcm_hw_params_set_rate_near (*playback_handle, hw_params, &rate, 0))
 {
 printf("snd_pcm_hw_params_set_rate_near err\n");
 return -1;
 }
 //7.
 if (0 > snd_pcm_hw_params_set_channels(*playback_handle, hw_params, 2))
 {
 printf("snd_pcm_hw_params_set_channels err\n");
 return -1;
 }

 //8. set hw_params
 if (0 > snd_pcm_hw_params (*playback_handle, hw_params))
 {
 printf("snd_pcm_hw_params err\n");
 return -1;
 }

 snd_pcm_hw_params_get_period_size(hw_params, &chunk_size, 0);

 snd_pcm_hw_params_free (hw_params);

 return 0;
}

int main(int argc, char *argv[])
{
 AVFormatContext *pFormatCtx = NULL; //for opening multi-media file
 int audioStream = -1;
 AVCodecContext *pCodecCtx = NULL;
 AVCodec *pCodec = NULL; // the codecer
 AVFrame *pFrame = NULL;
 AVPacket *packet;
 uint8_t *out_buffer;
 struct SwrContext *au_convert_ctx;
 snd_pcm_t *playback_handle;
 int bits_per_sample = 0;

 if (avformat_open_input(&pFormatCtx, argv[1], NULL, NULL) != 0) {
 printf("Failed to open video file!");
 return -1; // Couldn't open file
 }

 if(avformat_find_stream_info(pFormatCtx,NULL)<0)
 {
 printf("Failed to find stream info.\n");
 return -1;
 }

 audioStream = av_find_best_stream(pFormatCtx, AVMEDIA_TYPE_AUDIO, -1, -1, NULL, 0);
 if (audioStream == -1) {
 printf("Din't find a video stream!");
 return -1;// Didn't find a video stream
 }

 av_dump_format(pFormatCtx, audioStream, NULL, false);

 // Find the decoder for the video stream
 pCodec = avcodec_find_decoder(pFormatCtx->streams[audioStream]->codecpar->codec_id);
 if (pCodec == NULL) {
 printf("Unsupported codec!\n");
 return -1; // Codec not found
 }

 // Copy context
 pCodecCtx = avcodec_alloc_context3(pCodec);
 AVCodecParameters *pCodecParam = pFormatCtx->streams[audioStream]->codecpar;

 if (avcodec_parameters_to_context(pCodecCtx, pCodecParam) < 0) {
 printf("Failed to set codec params\n");
 return -1;
 }
 // Open codec
 if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {
 printf("Failed to open decoder!\n");
 return -1; // Could not open codec
 }
 packet = av_packet_alloc();
 pFrame = av_frame_alloc();

 uint64_t iInputLayout = av_get_default_channel_layout(pCodecCtx->channels);
 enum AVSampleFormat eInputSampleFormat = pCodecCtx->sample_fmt;
 int iInputSampleRate = pCodecCtx->sample_rate;


 uint64_t iOutputLayout = av_get_default_channel_layout(pCodecCtx->channels);
 int iOutputChans = pCodecCtx->channels;
 enum AVSampleFormat eOutputSampleFormat = AV_SAMPLE_FMT_S16;
 int iOutputSampleRate = pCodecCtx->sample_rate;

 au_convert_ctx = swr_alloc_set_opts(NULL,iOutputLayout, eOutputSampleFormat, iOutputSampleRate,
 iInputLayout,eInputSampleFormat, iInputSampleRate, 0, NULL);
 swr_init(au_convert_ctx);
 int iConvertLineSize = 0;
 int iConvertBuffSize = av_samples_get_buffer_size(&iConvertLineSize, iOutputChans, pCodecCtx->frame_size, eOutputSampleFormat, 0);
 printf("ochans: %d, ifrmsmp: %d, osfmt: %d, cbufsz: %d\n", iOutputChans, pCodecCtx->frame_size, eOutputSampleFormat, iConvertBuffSize);
 out_buffer = (uint8_t *) av_malloc(iConvertBuffSize);

 if(eOutputSampleFormat == AV_SAMPLE_FMT_S16 )
 {
 bits_per_sample = 16;
 }
 /*** alsa handle ***/
 init_pcm_play(&playback_handle,256, iOutputSampleRate,bits_per_sample,2);

 if (0 > snd_pcm_prepare (playback_handle))
 {
 printf("snd_pcm_prepare err\n");
 return -1;
 }

 while (av_read_frame(pFormatCtx, packet) >= 0) {
 if (packet->stream_index == audioStream) {
 avcodec_send_packet(pCodecCtx, packet);
 while (avcodec_receive_frame(pCodecCtx, pFrame) == 0) {
 int outframes = swr_convert(au_convert_ctx, &out_buffer, pCodecCtx->frame_size, (const uint8_t **) pFrame->data, pFrame->nb_samples); // 转换音频
 snd_pcm_writei(playback_handle, out_buffer, outframes);
 av_frame_unref(pFrame);
 }
 }
 av_packet_unref(packet);
 }
 swr_free(&au_convert_ctx);
 snd_pcm_close(playback_handle);
 av_freep(&out_buffer);

 return 0;
}


When I ran it, i got following output.


./ffmpeg_test http://live.ximalaya.com/radio-first-page-app/live/2730/64.m3
u8
[hls @ 0x21a8020] Skip ('#EXT-X-VERSION:3')
[hls @ 0x21a8020] Opening 'http://broadcast.tx.xmcdn.com/live/2730_64_241104_000015_2186.aac' for reading
[hls @ 0x21a8020] Opening 'http://broadcast.tx.xmcdn.com/live/2730_64_241104_000015_2187.aac' for reading
Input #0, hls, from '(null)':
 Duration: N/A, bitrate: N/A
 Program 0
 Metadata:
 variant_bitrate : 0
 Stream #0:0: Audio: aac (HE-AAC), 44100 Hz, stereo, fltp
 Metadata:
 variant_bitrate : 0
[http @ 0x21b7ba0] Opening 'http://broadcast.tx.xmcdn.com/live/2730_64_241104_000015_2188.aac' for reading
[hls @ 0x21a8020] Skip ('#EXT-X-VERSION:3')
[http @ 0x21d4c20] Opening 'http://broadcast.tx.xmcdn.com/live/2730_64_241104_000015_2189.aac' for reading


At the beginning, it can play the audio, until a second
Opening http://...occurred.

How to make it work to play m3u8 audio stream continously ?


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