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• ffmpeg convert 4K file to 1080p mp4 file

  16 septembre 2015, par Hüseyin GÖZE

  i’m using ffmpeg to converting video in windows service, when i’m trying to converting 4K video to 1080p ffmpeg returns error like this :

  libvo_aacenc Stream mapping : Stream #0:0 -> #0:0 (h264 (native) ->
  h264 (libx264)) Stream #0:2 -> #0:1 (ac3 (native) -> aac
  (libvo_aacenc)) Error while opening encoder for output stream #0:1 -
  maybe incorrect parameters such as bit_rate, rate, width or height

  my ffmpeg convert command like this :

  ffmpeg -i 4k2.mp4 -vf scale=1920:1080 -threads 3 4k2_1080.mp4

  what’s wrong with this ?

• ffmpeg javacv audio - integrate audio into video javacv

  16 juillet 2014, par Cyril Lequeux

  I’ve looked for this issue since a while but I didn’t find out any solution...
  I want to create a video from pictures with javacv (great, it works). But now I want to put in a sync way audio into my video. I heard I had to make a byte array with the sound data and then record() according to the audiobitrate/8 = audiobyterate but i didn’t find a simple sample...I’m not the first asking this question but all the same questions are still unanswered

      IplImage Image = cvLoadImage("data/photo.jpg");
  
      FrameRecorder recorder = FFmpegFrameRecorder.createDefault("out.avi", 1920, 1080);
  
      recorder.setVideoCodec(AV_CODEC_ID_MPEG4);
  
      recorder.setFrameRate(30);
  
      recorder.setFormat("avi");
  
      recorder.start();
  
          for(int s=0; s<10; s++){
  
              for(int i=0; i<30; i++){
  
                  recorder.record(Image);
  
  //Here I want to record my music.mp3 stream
  
              }
  
          }
  
          recorder.stop();

  Please help me, I’m desesperate :p
  Ps : I’m using javacv 0.3 FFMPEG 1.06 OpenCv 2.4.3

• FFmpeg : generating H264 video in c++

  13 octobre 2015, par EZEROFIVE EMD

  Im using ffmpeg library in windows with vs2012 to convert a series of images into Mp4 with H264 encoding. Im new to FFMPEG.

  Below is my code. Everything went fine. Video is created.But i can play the video in vlc player only if i changed the extension to ".h264", also when i check for codec information it says "H264 - MPEG-4 AVC (part 10) (h264)". but when i checked the same for other mp4 videos which are downloaded from web. it says "H264 - MPEG-4" AVC (part 10) (avc1)". I dont understand where it went wrong. Also i searched a lot, some says like add SPS and PPS.

  const uint8_t sps[] = { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00,
  
  0x0a, 0xf8, 0x41, 0xa2 };
  
  const uint8_t pps[] = { 0x00, 0x00, 0x00, 0x01, 0x68, 0xce,
  
  0x38, 0x80 };

  So i added the above value to video file before i add the image stream. But no luck.
  Can anyone help on this..Thanks in advance.

  const uint8_t sps[] = { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00,
  
  0x0a, 0xf8, 0x41, 0xa2 };
  
  const uint8_t pps[] = { 0x00, 0x00, 0x00, 0x01, 0x68, 0xce,
  
  0x38, 0x80 };
  
  const uint8_t slice_header[] = { 0x00, 0x00, 0x00, 0x01, 0x05, 0x88,
  
  0x84, 0x21, 0xa0 };
  
  const uint8_t macroblock_header[] = { 0x0d, 0x00 };
  
  
  
  const uint8_t spspps[] = { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x0a, 0xf8, 0x41, 0xa2, 
  
                             0x00, 0x00, 0x00, 0x01, 0x68, 0xce, 0x38, 0x80
  
                           };
  
  
  
  int ff_load_image(uint8_t *data[4], int linesize[4],
  
          int *w, int *h, enum PixelFormat *pix_fmt,
  
          const char *filename, void *log_ctx)
  
      {
  
          AVInputFormat *iformat = NULL;
  
          AVFormatContext *format_ctx = NULL;
  
          AVCodec *codec=NULL;
  
          AVCodecContext *codec_ctx=NULL;
  
          AVFrame *frame=NULL;
  
          int frame_decoded, ret = 0;
  
          AVPacket pkt;
  
  
  
          av_register_all();
  
  
  
          iformat = av_find_input_format("image2");
  
          if ((ret = avformat_open_input(&format_ctx, filename, iformat, NULL)) < 0) {
  
              return ret;
  
          }
  
  
  
          codec_ctx = format_ctx->streams[0]->codec;
  
          codec = avcodec_find_decoder(codec_ctx->codec_id);
  
          if (!codec) {
  
              ret = AVERROR(EINVAL);
  
              goto end;
  
          }
  
  
  
          if ((ret = avcodec_open2(codec_ctx, codec, NULL)) < 0) {
  
              goto end;
  
          }
  
  
  
          //if (!(frame = avcodec_alloc_frame()) ) {
  
          if (!(frame = av_frame_alloc()) ) {
  
              ret = AVERROR(ENOMEM);
  
              goto end;
  
          }
  
  
  
          ret = av_read_frame(format_ctx, &pkt);
  
          if (ret < 0) {
  
              goto end;
  
          }
  
  
  
          ret = avcodec_decode_video2(codec_ctx, frame, &frame_decoded, &pkt);
  
          if (ret < 0 || !frame_decoded) {
  
              goto end;
  
          }
  
          ret = 0;
  
  
  
          *w       = frame->width;
  
          *h       = frame->height;
  
          *pix_fmt = (PixelFormat)frame->format;
  
  
  
          if ((ret = av_image_alloc(data, linesize, *w, *h, (AVPixelFormat)*pix_fmt, 16)) < 0)
  
              goto end;
  
          ret = 0;
  
  
  
          av_image_copy(data, linesize, (const uint8_t **)frame->data, frame->linesize, (AVPixelFormat)*pix_fmt, *w, *h);
  
  
  
  end:
  
          if(codec_ctx) { avcodec_close(codec_ctx); }
  
          if(format_ctx) { avformat_close_input(&format_ctx); }
  
          if(frame) { av_freep(&frame); }
  
          av_free_packet(&pkt);
  
                  return ret;
  
      }
  
  
  
      int load_image_into_frame(AVFrame *frame, const char *filename)
  
      {
  
          int retval = -1, res;
  
          static struct SwsContext *sws_ctx;
  
          uint8_t *image_data[4];
  
          int linesize[4];
  
          int source_width, source_height;
  
          enum PixelFormat source_fmt;
  
  
  
          res = ff_load_image(image_data, linesize, &source_width, &source_height, &source_fmt, filename, NULL);
  
  
  
          if (source_fmt != frame->format) {
  
              sws_ctx = sws_getContext(source_width, source_height, (AVPixelFormat)source_fmt,
  
                  frame->width, frame->height, (AVPixelFormat)frame->format,
  
                  sws_flags, NULL, NULL, NULL);
  
  
  
              sws_scale(sws_ctx,
  
                  (const uint8_t * const *)image_data, linesize,
  
                  0, frame->height, frame->data, frame->linesize);
  
          }
  
  
  
          retval = 0;
  
  error:
  
          av_freep(&image_data[0]);
  
          sws_freeContext(sws_ctx);
  
          return retval;
  
      }
  
  
  
      int write_frame_to_file(FILE *file, AVFrame *frame, AVCodecContext *codec_context, AVPacket *pkt) {
  
          int res, got_output;
  
          av_init_packet(pkt);
  
          pkt->data = NULL;
  
          pkt->size = 0;
  
  
  
          /* generate synthetic video */
  
          frame->pts += 30;
  
  
  
          res = avcodec_encode_video2(codec_context, pkt, frame, &got_output);
  
  
  
          if (got_output) {
  
  
  
              fwrite(pkt->data, 1, pkt->size, file);
  
              av_free_packet(pkt);
  
          }
  
          return 0;
  
  error:
  
          return -1;
  
      }
  
  
  
      int write_image_to_file(FILE *file, const char *filename, int count, AVFrame *frame, AVCodecContext *codec_context, AVPacket *pkt) {
  
          int res, i;
  
          res = load_image_into_frame(frame, filename);
  
  
  
          for (i = 0; i < count; i++) {
  
  
  
              res = write_frame_to_file(file, frame, codec_context, pkt);
  
          }
  
  
  
          return 0;
  
  error:
  
          return -1;
  
      }
  
  
  
      int write_delayed_frames_to_file(FILE *file, AVFrame *frame, AVCodecContext *codec_context, AVPacket *pkt) {
  
          int res, got_output;
  
  
  
          for (got_output = 1; got_output;) {
  
              res = avcodec_encode_video2(codec_context, pkt, NULL, &got_output);
  
  
  
              if (got_output) {
  
                  fwrite(pkt->data, 1, pkt->size, file);
  
                  av_free_packet(pkt);
  
              }
  
          }
  
  
  
          return 0;
  
  error:
  
          return -1;
  
      }
  
  
  
      AVCodecContext *get_codec_context(int width, int height, int fps)
  
      {
  
          int res;
  
          avcodec_register_all();
  
  
  
          AVCodec *codec;
  
          AVCodecContext *codec_context = NULL;
  
  
  
          codec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
  
  
          codec_context = avcodec_alloc_context3(codec);
  
  
  
          codec_context->bit_rate = 441000;
  
          codec_context->width = width;
  
          codec_context->height = height;
  
          AVRational temp_113 = {1, fps};
  
          AVRational temp_114 = {fps, 1};
  
          codec_context->time_base= temp_113;
  
          codec_context->gop_size = 10;
  
          codec_context->max_b_frames=1;
  
          codec_context->pix_fmt = AV_PIX_FMT_YUV420P;        
  
  
  
          res = avcodec_open2(codec_context, codec, NULL);
  
  
  
          return codec_context;
  
  error:
  
          return NULL;
  
      }
  
  
  
      AVFrame *get_av_frame(AVCodecContext *codec_context) {
  
          int res;
  
          AVFrame *frame;
  
  
  
          frame = av_frame_alloc();
  
          frame->height = codec_context->height;
  
          frame->width = codec_context->width;
  
          frame->format = codec_context->pix_fmt;
  
          frame->pts = 0;
  
  
  
          res = av_image_alloc(frame->data, frame->linesize, frame->width, frame->height, (AVPixelFormat)frame->format, 1);
  
  
  
          return frame;
  
  error:
  
          return NULL;
  
      }
  
  
  
      int main(int argc, char **argv)
  
      {
  
          const char *filename = "result video\\test.mp4";
  
          FILE *file=NULL;
  
          int res, retval=-1;
  
          AVCodecContext *codec_context= NULL;
  
          AVFrame *frame=NULL;
  
          AVPacket pkt;
  
          uint8_t endcode[] = { 0, 0, 1, 0xb7 };
  
  
  
          codec_context = get_codec_context(1920, 1080, 30);
  
  
  
          file = fopen(filename, "wb");
  
          //check(file != NULL, "could not open destination file %s", filename);
  
  
  
          frame = get_av_frame(codec_context);        
  
  
  
          //fwrite(sps, 1, sizeof(sps), file);
  
          //fwrite(pps, 1, sizeof(pps), file);
  
  
  
          /*codec_context->extradata = (uint8_t *)malloc(sizeof(uint8_t) * sizeof(spspps));
  
  
  
          for(unsigned int index = 0; index < sizeof(spspps); index++)
  
          {
  
              codec_context->extradata[index] = spspps[index];
  
          }
  
  
  
          codec_context->extradata_size = (int)sizeof(spspps);*/
  
  
  
          codec_context->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
  
  
          int i, frames= 51;
  
          for (i = 0; i < frames; i++) {
  
              std::stringstream ss;
  
              ss<<"\\frames\\out"<<( i + 1)<<".jpg";
  
              res = write_image_to_file(file, ss.str().c_str(), 3, frame, codec_context, &pkt);
  
          }
  
  
  
  
  
          res = write_delayed_frames_to_file(file, frame, codec_context, &pkt);
  
          fwrite(endcode, 1, sizeof(endcode), file);
  
  
  
          retval = 0;
  
  error:
  
          if (file)
  
              fclose(file);
  
          if (codec_context) {
  
              avcodec_close(codec_context);
  
              av_free(codec_context);
  
          }
  
          if (frame) {
  
              av_freep(&frame->data[0]);
  
              av_free(frame);
  
          }
  
          return retval;
  
      }
  
  }