Recherche avancée

Sur d’autres sites (6539)

• Is it possible to establish youtube live stream with ffmgep from Android if video encoded on another device

  20 mai 2015, par Nick Kleban

  I have "Android Device" and some other "Device with camera". This device captures video, encodes it (h264) and sends it to my phone through UDP. On phone i’m receiving only AVFrame’s and it enough to decode and show this video on phone screen. But i can’t establish working video stream to youtube.

  The problem is that all examples does encoding and streaming on one device, so they have properly initialized AVStream and AVPaket. I have feeling that i’m missing something but i cant find what. I’ve passed all stages of creating broadcast, stream, initialization of AVFormatContext, and av_interleaved_write_frame returns 0. Seems like all ok.
  But on youtube i see short living indication of video stream quality, then it dissapears, and all the time there is no video.

  So the question is is it possible to establish video stream to Youtube live if you have only AVFrames that encoded on some other device, and you missing some context information ? If so - what i’m missing ?

  static AVFormatContext *fmt_context = NULL;
  
  static AVStream *video_stream;
  
  
  
  eLIVESTREAM_ERROR LIVESTREAM_Manager_Start(char* url) {
  
      eLIVESTREAM_ERROR error = LIVESTREAM_ERROR;
  
      av_register_all();
  
      avcodec_register_all();
  
      fmt_context = avformat_alloc_context();
  
  
  
      AVOutputFormat *ofmt = NULL;
  
      if (fmt_context != NULL) {
  
          ofmt = av_guess_format("flv", NULL, NULL);
  
          if (ofmt != NULL) {
  
              fmt_context->oformat = ofmt;
  
  
  
              video_stream = av_new_stream(fmt_context, 0);
  
              AVCodec *video_codec = avcodec_find_decoder(AV_CODEC_ID_H264);
  
              AVCodecContext *video_codec_ctx = video_stream->codec;
  
              video_codec_ctx->pix_fmt = PIX_FMT_YUV420P;
  
              video_codec_ctx->skip_frame = AVDISCARD_DEFAULT;
  
              video_codec_ctx->error_concealment = FF_EC_GUESS_MVS | FF_EC_DEBLOCK;
  
              video_codec_ctx->skip_loop_filter = AVDISCARD_DEFAULT;
  
              video_codec_ctx->workaround_bugs = FF_BUG_AUTODETECT;
  
              video_codec_ctx->codec_type = AVMEDIA_TYPE_VIDEO;
  
              video_codec_ctx->codec_id = AV_CODEC_ID_H264;
  
              video_codec_ctx->skip_idct = AVDISCARD_DEFAULT;
  
              video_codec_ctx->time_base.num = 1;
  
              video_codec_ctx->time_base.den = 30;
  
              video_codec_ctx->width = 640;
  
              video_codec_ctx->height = 386;
  
  
  
              if(fmt_context->oformat->flags & AVFMT_GLOBALHEADER)  
  
                 video_codec_ctx->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
  
  
              int codec_open_rslt = avcodec_open2(video_codec_ctx, video_codec, NULL);
  
              if (codec_open_rslt < 0) {
  
                  error = LIVESTREAM_ERROR;
  
              }
  
  
  
              if (!(ofmt->flags & AVFMT_NOFILE)) {
  
                  int open_rslt = avio_open(&fmt_context->pb, url, URL_WRONLY);
  
                  if (open_rslt == 0) {
  
                      int wrt_header_rslt = avformat_write_header(fmt_context, NULL);
  
                      if (wrt_header_rslt == 0) {
  
                          error = LIVESTREAM_OK;
  
                      } else {
  
                          avio_close(fmt_context->pb);
  
                      }
  
                  }
  
              }
  
          }
  
      }
  
      if (error != LIVESTREAM_OK) {
  
          if (ofmt != NULL) {
  
              av_free(ofmt);
  
          }
  
          if (fmt_context != NULL) {
  
              av_free(fmt_context);
  
          }
  
      }
  
      return error;
  
  }
  
  
  
  eLIVESTREAM_ERROR LIVESTREAM_Manager_Send (uint8_t *data , int size) {
  
      eLIVESTREAM_ERROR error = LIVESTREAM_OK;
  
      if (fmt_context == NULL || size <= 0 || data == NULL) {
  
          error = LIVESTREAM_ERROR;
  
      }
  
      if (error == LIVESTREAM_OK) {
  
          AVPacket pkt;
  
          av_init_packet(&pkt);
  
          pkt.stream_index = video_stream->index;
  
          pkt.data = data;
  
          pkt.size = size;
  
          pkt.pts = AV_NOPTS_VALUE;
  
          pkt.dts = AV_NOPTS_VALUE;
  
          pkt.duration = 0;
  
          pkt.pos = -1;
  
          int write_rslt = av_interleaved_write_frame(fmt_context, &pkt);
  
          if (write_rslt != 0) {
  
              error = LIVESTREAM_ERROR;
  
          }
  
      }
  
      return error;
  
  }
  
  
  
  void LIVESTREAM_Manager_Finish () {
  
      av_write_trailer(fmt_context);
  
      avio_close(fmt_context->pb);
  
      av_free(fmt_context);
  
      fmt_context = NULL;
  
  }

• YouTube - MP4 to MP3 messes up

  23 novembre 2019, par theeSpark

  It’s supposed to download all the videos in the playlist and convert them to mp3. But all this does is make the mp4’s and 1 empty mp3 with a number higher than the max mp4. My newbie brain doesn’t know how to fix this...

  var ytpl = require('ytpl');
  
  var fs = require('fs-extra');
  
  var path = require('path');
  
  var ffmpeg = require('fluent-ffmpeg');
  
  var binaries = require('ffmpeg-static');
  
  var ytdl = require('ytdl-core');
  
  
  
  var output_dir = path.join(__dirname+"/dl");
  
  
  
  ytpl("PL8n8S4mVUWvprlN2dCAMoIo6h47ZwR_gn", (err, pl) => {
  
      if(err) throw err;
  
  
  
      let c = 0;
  
  
  
      pl.items.forEach((i) => {
  
          ytdl(i.url_simple+"", { filter: 'audioonly' }).pipe(fs.createWriteStream(output_dir+"/"+c+".mp4")).on('finish', () => {
  
              console.log("Finished MP4 DL, starting conversion...");
  
              ffmpeg(output_dir+"/"+c+".mp4")
  
                  .setFfmpegPath(binaries.path)
  
                  .format('mp3')
  
                  .audioBitrate(320)
  
                  .output(fs.createWriteStream(output_dir+"/"+c+".mp3"))
  
                  .on('end', () => {
  
                      console.log("Finished MP3 Convert...");
  
                  })
  
                  .run();
  
          });
  
          c++;
  
      });
  
  
  
  });

• Revision 61148 : Il faut faire le test sur $saisies[$cle][’saisies’] car ...

  9 mai 2012, par yffic@… — Log

  Il faut faire le test sur $saisies[$cle]saisies ? car $saisies[$cle]saisies ? peut avoir été supprimé du tableau de saisies ligne 362 dans le cas où le fieldset possède sa propre condition et que cette dernière n’est pas remplie. (Joseph)