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• How to find video time by using FFProbe in java ?

  13 octobre 2022, par Dadireddy Chenna

  I have used the below logic to get the duration but how can i convert to time using any library ?

  


     <dependency>&#xA;        <groupid>net.bramp.ffmpeg</groupid>&#xA;        <artifactid>ffmpeg</artifactid>&#xA;        <version>0.7.0</version>&#xA;    </dependency>&#xA;&#xA;    FFprobe ffprobe = new FFprobe();&#xA;    FFmpegProbeResult probeResult = ffprobe.probe(mediaPath);&#xA;    FFmpegFormat format = probeResult.getFormat();&#xA;    double duration = format.duration;&#xA;    // how to convert double to video time (01:29:01)&#xA;

  


  ffprobe -i /video/sample.mp4 -show_entries format=duration -v quiet -of csv="p=0" -sexagesimal

  


• where can i find the file and android write in JNI

  14 janvier 2016, par chaoqi

  I wirte a test demo for ffmpeg, read a flac file and decoder it to a new pcm file.

  after done the work, i could not find the output file.

  so I open the output file with a new FILE pointer, and open is ok, does anybody give any tips, thanks.

  static int decode_packet(int *got_frame, int cached)
  
  {
  
      int ret = 0;
  
      int decoded = pkt.size;
  
  
  
      *got_frame = 0;
  
  
  
      if (pkt.stream_index == audio_stream_idx) {
  
          /* decode audio frame */
  
          ret = avcodec_decode_audio4(audio_dec_ctx, frame, got_frame, &pkt);
  
          if (ret < 0) {
  
              LOG("Error decoding audio frame (%s)\n", av_err2str(ret));
  
              return ret;
  
          }
  
  
  
          decoded = FFMIN(ret, pkt.size);
  
  
  
          if (*got_frame) {
  
              LOG("frame->format: %d", frame->format);
  
              size_t unpadded_linesize = frame->nb_samples * av_get_bytes_per_sample(AV_SAMPLE_FMT_S16/*frame->format*/);
  
              LOG("audio_frame%s n:%d nb_samples:%d pts:%s\n", cached ? "(cached)" : "", audio_frame_count++, frame->nb_samples,
  
                     av_ts2timestr(frame->pts, &audio_dec_ctx->time_base));
  
  
  
              fwrite(frame->extended_data[0], 1, unpadded_linesize, audio_dst_file);
  
          }
  
      }
  
  
  
      if (*got_frame && api_mode == API_MODE_NEW_API_REF_COUNT)
  
          av_frame_unref(frame);
  
  
  
      return decoded;
  
  }
  
  
  
      // as convient i write the abspath `/storage/emulated/0` which i got by rountine Environment.getExternalStorageDirectory().getAbsolutePath()
  
      const char *src_filename = "/storage/emulated/0/pyghlkn.flac";
  
      const char *audio_dst_filename = "/storage/emulated/0/test.pcm";
  
  
  
      FILE *audio_dst_file = NULL;
  
      FILE *audio_dump = NULL;
  
  
  
      JNIEXPORT void JNICALL Java_cn_com_longmaster_ffmpeg_encoder
  
        (JNIEnv *, jobject)
  
        {
  
            //......
  
              /* read frames from the file */
  
              while (av_read_frame(fmt_ctx, &pkt) >= 0) {
  
                  AVPacket orig_pkt = pkt;
  
                  do {
  
                      ret = decode_packet(&got_frame, 0);
  
                      LOG("write decode_packet... pkt.size: %d ", pkt.size);
  
                      if (ret < 0)
  
                          break;
  
                      pkt.data += ret;
  
                      pkt.size -= ret;
  
                  } while (pkt.size > 0);
  
                  av_free_packet(&orig_pkt);
  
              }
  
  
  
              /* flush cached frames */
  
              pkt.data = NULL;
  
              pkt.size = 0;
  
              do {
  
                  decode_packet(&got_frame, 1);
  
                  LOG("flush cached frames");
  
              } while (got_frame);
  
  
  
  
  
              if (audio_dump)
  
              {
  
                  LOG("default audio_dump ready...");
  
              }
  
              else
  
              {
  
                  LOG("default audio_dump not ready...");
  
              }
  
  
  
              audio_dump = fopen(audio_dst_filename, "rb");
  
              if (audio_dump) {
  
                  LOG("open pcm file ok...");
  
              } else {
  
                  LOG("open pcm file fail...");
  
              }
  
  
  
              avcodec_close(audio_dec_ctx);
  
              avformat_close_input(&fmt_ctx);
  
              if (audio_dst_file) {
  
                  fclose(audio_dst_file);
  
              }
  
  
  
              av_frame_free(&frame);
  
  
  
              return ;
  
  
  
        }

• Find all video files in directory with FLAC audio codec

  8 septembre 2023, par JSSpen

  Is it possible to search a directory and output a text file listing every video file that has FLAC audio ?

  


  My television doesn't support FLAC so when I run into one I have been converting them with a FFMPEG script but it would be nice to be able to find them all in advance instead of waiting until I hit the problem while trying to play the files. I'm hoping there is a way that doesn't involve just opening every file in Mediainfo and checking manually.

  


  Maybe there is a way to just output all of the Mediainfo information for a directory and then I can just find all FLAC occurrences in a csv sheet ?