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• ffmpeg does not work with a large number of urls in the request

  2 avril 2023, par Hack team

  If i put one url in the array, everything works perfectly, but when i add more than one url to the array, it throws an error :

  


  HTTP error 403 Forbidden https://p16-sign-sg.tiktokcdn.com/tos-alisg-i-photomode-sg/2c182489bc4e42dcbb70f37a283cf5f1~tplv-photomode-image.jpeg?from=photomode.AWEME_DETAIL&x-expires=1681740000&x-signature=BaB75chVtpoZg6sE%2B0oWmxtzky0%3D https://p16-sign-sg.tiktokcdn.com/tos-alisg-i-photomode-sg/34cae24dad35476d96d8db03b46076b9~tplv-photomode-image.jpeg?from=photomode.AWEME_DETAIL&x-expires=1681740000&x-signature=RTyGbq%2BfLz3hNahtLJyaWycQtPI%3D: Server returned 403 Forbidden (access denied)


  


  However, if i put each of the urls one by one, then access is available and everything works perfectly

  


  It feels like ffmpeg makes one out of three urls and catches an error because of it. But I don't understand how to handle urls.

  


  My code :

  


  from PIL import Image
from io import BytesIO

import requests
import ffmpeg

def make_even(n):
    return n + n % 2

list_of_urls = [
    "https://p16-sign-sg.tiktokcdn.com/tos-alisg-i-photomode-sg/2c182489bc4e42dcbb70f37a283cf5f1~tplv-photomode-image.jpeg?from=photomode.AWEME_DETAIL&x-expires=1681740000&x-signature=BaB75chVtpoZg6sE%2B0oWmxtzky0%3D",
    "https://p16-sign-sg.tiktokcdn.com/tos-alisg-i-photomode-sg/34cae24dad35476d96d8db03b46076b9~tplv-photomode-image.jpeg?from=photomode.AWEME_DETAIL&x-expires=1681740000&x-signature=RTyGbq%2BfLz3hNahtLJyaWycQtPI%3D",
    "https://p16-sign-sg.tiktokcdn.com/tos-alisg-i-photomode-sg/c2cb000f9332498caf6bd837f42e92c6~tplv-photomode-image.jpeg?from=photomode.AWEME_DETAIL&x-expires=1681740000&x-signature=4Zh5PFWNUYQhxQHuKM7P8rk8geU%3D"
]

response = requests.get(list_of_urls\[0\])
img = Image.open(BytesIO(response.content))

width, height = img.size
width = make_even(width)
height = make_even(height)

(
    ffmpeg
    .input(' '.join(list_of_urls), framerate=0.33)
    .filter('scale', width, height)
    .output('output.mp4')
    .run()
)


  


• FFmpeg how to apply "aac_adtstoasc" and "h264_mp4toannexb" bitstream filters to transcode to h.264 with AAC

  9 juillet 2015, par larod

  I’ve been struggling with this issue for about a month, I have studied FFmpeg documentation more specifically transcode_aac.c, transcoding.c, decoding_encoding.c and Handbrake’s implementation which is really dense.

  The error that I’m getting is the following : [mp4 @ 0x11102f800] Malformed AAC bitstream detected: use the audio bitstream filter 'aac_adtstoasc' to fix it ('-bsf:a aac_adtstoasc' option with ffmpeg).

  The research I’ve done points to a filter that needs to be implemented.

  FIX:AAC in some container format (FLV, MP4, MKV etc.) need "aac_adtstoasc" bitstream filter (BSF).

  I know I can do the following :

  AVBitStreamFilterContext* aacbsfc =  av_bitstream_filter_init("aac_adtstoasc");

  And then do something like this :

  av_bitstream_filter_filter(aacbsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);

  What eludes me is when to filter the AVPacket, is it before calling av_packet_rescale_ts or inside init_filter. I would greatly appreciate if someone can point me in the right direction. Thanks in advance.

  // Variables
  
  AVFormatContext *_ifmt_ctx, *_ofmt_ctx;
  
  FilteringContext *_filter_ctx;
  
  AVBitStreamFilterContext *_h264bsfc;
  
  AVBitStreamFilterContext *_aacbsfc;
  
  NSURL *_srcURL, *_dstURL;
  
  
  
   - (IBAction)trancode:(id)sender {
  
          NSLog(@"%s %@",__func__, _mediaFile.fsName);
  
          int ret, got_frame;
  
          int (*dec_func)(AVCodecContext *, AVFrame *, int *, const AVPacket *);
  
          unsigned int stream_index, i;
  
          enum AVMediaType type;
  
          AVPacket packet = {.data = NULL, .size = 0};
  
          AVFrame *frame = NULL;
  
          _h264bsfc = av_bitstream_filter_init("h264_mp4toannexb");
  
          _aacbsfc =  av_bitstream_filter_init("aac_adtstoasc");
  
  
  
      _srcURL = [Utility urlFromBookmark:_mediaFile.bookmark];
  
      if ([_srcURL startAccessingSecurityScopedResource]) {
  
          NSString *newFileName = [[_srcURL.lastPathComponent stringByDeletingPathExtension]stringByAppendingPathExtension:@"mp4"];
  
          _dstURL = [NSURL fileURLWithPath:[[_srcURL URLByDeletingLastPathComponent]URLByAppendingPathComponent:newFileName].path isDirectory:NO];
  
  
  
          [AppDelegate ffmpegRegisterAll];
  
  
  
          ret = open_input_file(_srcURL.path.fileSystemRepresentation);
  
          if (ret < 0) {
  
              NSLog(@"Error openning input file.");
  
          }
  
  
  
          ret = open_output_file(_dstURL.path.fileSystemRepresentation);
  
          if (ret < 0) {
  
              NSLog(@"Error openning output file.");
  
          }
  
  
  
          ret = init_filters();
  
          if (ret < 0) {
  
              NSLog(@"Error initializing filters.");
  
          }
  
  
  
          AVBitStreamFilterContext *h264bsfc = av_bitstream_filter_init("h264_mp4toannexb");
  
          AVBitStreamFilterContext* aacbsfc =  av_bitstream_filter_init("aac_adtstoasc");
  
          // Transcode *******************************************************************************
  
          while (1) {
  
              if ((ret = av_read_frame(_ifmt_ctx, &packet)) < 0) {
  
                  break;
  
              }
  
              stream_index = packet.stream_index;
  
              type = _ifmt_ctx->streams[packet.stream_index]->codec->codec_type;
  
              av_log(NULL, AV_LOG_DEBUG, "Demuxer gave frame of stream_index %u\n", stream_index);
  
  
  
  
  
  
  
              if (_filter_ctx[stream_index].filter_graph) {
  
                  av_log(NULL, AV_LOG_DEBUG, "Going to reencode&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, _ifmt_ctx->streams[stream_index]->codec->time_base);
  
                  dec_func = (type == AVMEDIA_TYPE_VIDEO) ? avcodec_decode_video2 : avcodec_decode_audio4;
  
                  ret = dec_func(_ifmt_ctx->streams[stream_index]->codec, frame, &got_frame, &packet);
  
                  if (ret < 0) {
  
                      av_frame_free(&frame);
  
                      av_log(NULL, AV_LOG_ERROR, "Decoding failed\n");
  
                      break;
  
                  }
  
  
  
                  if (got_frame) {
  
                      frame->pts = av_frame_get_best_effort_timestamp(frame);
  
                      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 reencoding */
  
                  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_free_packet(&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(NULL, i);
  
              if (ret < 0) {
  
                  av_log(NULL, AV_LOG_ERROR, "Flushing filter failed\n");
  
                  goto end;
  
              }
  
  
  
              /* flush encoder */
  
              ret = flush_encoder(i);
  
              if (ret < 0) {
  
                  av_log(NULL, AV_LOG_ERROR, "Flushing encoder failed\n");
  
                  goto end;
  
              }
  
          }
  
          av_write_trailer(_ofmt_ctx);
  
          av_bitstream_filter_close(h264bsfc);
  
          av_bitstream_filter_close(aacbsfc);
  
      } else {
  
          NSLog(@"Unable to resolve url for %@",_mediaFile.url.lastPathComponent);
  
      }
  
      [_srcURL stopAccessingSecurityScopedResource];
  
  
  
  end:
  
      av_free_packet(&packet);
  
      av_frame_free(&frame);
  
      for (i = 0; i < _ifmt_ctx->nb_streams; i++) {
  
          avcodec_close(_ifmt_ctx->streams[i]->codec);
  
          if (_ofmt_ctx && _ofmt_ctx->nb_streams > i && _ofmt_ctx->streams[i] && _ofmt_ctx->streams[i]->codec)
  
              avcodec_close(_ofmt_ctx->streams[i]->codec);
  
          if (_filter_ctx && _filter_ctx[i].filter_graph)
  
              avfilter_graph_free(&_filter_ctx[i].filter_graph);
  
      }
  
      av_free(_filter_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);
  
  }

  The following method is used to open the input file and create the ifmt_ctx.

  int open_input_file(const char *filename) {
  
      int ret;
  
      unsigned int i;
  
  
  
      _ifmt_ctx = NULL;
  
      if ((ret = avformat_open_input(&_ifmt_ctx, filename, NULL, NULL)) < 0) {
  
          av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n");
  
          return ret;
  
      }
  
  
  
      if ((ret = avformat_find_stream_info(_ifmt_ctx, NULL)) < 0) {
  
          av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
  
          return ret;
  
      }
  
  
  
      for (i = 0; i < _ifmt_ctx->nb_streams; i++) {
  
          AVStream *stream;
  
          AVCodecContext *codec_ctx;
  
          stream = _ifmt_ctx->streams[i];
  
          codec_ctx = stream->codec;
  
          /* Reencode video & audio and remux subtitles etc. */
  
          if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
  
              || codec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
  
              /* Open decoder */
  
              ret = avcodec_open2(codec_ctx,
  
                                  avcodec_find_decoder(codec_ctx->codec_id), NULL);
  
              if (ret < 0) {
  
                  av_log(NULL, AV_LOG_ERROR, "Failed to open decoder for stream #%u\n", i);
  
                  return ret;
  
              }
  
          }
  
      }
  
  
  
      // Remove later
  
      av_dump_format(_ifmt_ctx, 0, filename, 0);
  
      return 0;
  
  }

  This method is used to open the output file and create the output format context.

  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 = NULL;
  
      avformat_alloc_output_context2(&_ofmt_ctx, NULL, NULL, filename);
  
      if (!_ofmt_ctx) {
  
          av_log(NULL, AV_LOG_ERROR, "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, NULL);
  
          if (!out_stream) {
  
              av_log(NULL, AV_LOG_ERROR, "Failed allocating output stream\n");
  
              return AVERROR_UNKNOWN;
  
          }
  
  
  
          in_stream = _ifmt_ctx->streams[i];
  
          dec_ctx = in_stream->codec;
  
          enc_ctx = out_stream->codec;
  
  
  
          if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
  
              // set video stream
  
              encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
  
              avcodec_get_context_defaults3(enc_ctx, encoder);
  
              av_opt_set(enc_ctx->priv_data, "preset", "slow", 0);
  
              enc_ctx->height = dec_ctx->height;
  
              enc_ctx->width = dec_ctx->width;
  
              enc_ctx->bit_rate = dec_ctx->bit_rate;
  
              enc_ctx->time_base = out_stream->time_base = dec_ctx->time_base;
  
              enc_ctx->pix_fmt = encoder->pix_fmts[0];
  
  
  
              ret = avcodec_open2(enc_ctx, encoder, NULL);
  
              if (ret < 0) {
  
                  av_log(NULL, AV_LOG_ERROR, "Cannot open video encoder for stream #%u\n", i);
  
                  return ret;
  
              }
  
  
  
          } else if (dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
  
              // set audio stream
  
              //encoder = avcodec_find_encoder(AV_CODEC_ID_AAC);
  
              encoder = avcodec_find_encoder_by_name("libfdk_aac");
  
              avcodec_get_context_defaults3(enc_ctx, encoder);
  
              enc_ctx->profile = FF_PROFILE_AAC_HE_V2;
  
              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);
  
              enc_ctx->sample_fmt = encoder->sample_fmts[0];
  
              enc_ctx->time_base = out_stream->time_base = (AVRational){1, enc_ctx->sample_rate};
  
              enc_ctx->bit_rate = dec_ctx->bit_rate;
  
  
  
              ret = avcodec_open2(enc_ctx, encoder, NULL);
  
              if (ret < 0) {
  
                  av_log(NULL, AV_LOG_ERROR, "Cannot open video encoder for stream #%u\n", i);
  
                  return ret;
  
              }
  
  
  
          } else if (dec_ctx->codec_type == AVMEDIA_TYPE_UNKNOWN) {
  
              // deal with error
  
              av_log(NULL, AV_LOG_FATAL, "Elementary stream #%d is of unknown type, cannot proceed\n", i);
  
              return AVERROR_INVALIDDATA;
  
          } else {
  
              // remux stream
  
              ret = avcodec_copy_context(_ofmt_ctx->streams[i]->codec,
  
                                         _ifmt_ctx->streams[i]->codec);
  
              if (ret < 0) {
  
                  av_log(NULL, AV_LOG_ERROR, "Copying stream context failed\n");
  
                  return ret;
  
              }
  
          }
  
  
  
          if (_ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER) {
  
              enc_ctx->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
          }
  
      }
  
  
  
      av_dump_format(_ofmt_ctx, 0, filename, 1);
  
  
  
      NSURL *openFileURL = [Utility openPanelAt:[NSURL URLWithString:_dstURL.URLByDeletingLastPathComponent.path]
  
                                      withTitle:@"Transcode File"
  
                                        message:@"Please allow Maví to create the new file."
  
                                      andPrompt:@"Grant Access"];
  
  
  
      openFileURL = [openFileURL URLByAppendingPathComponent:_dstURL.lastPathComponent isDirectory:NO];
  
      if (!(_ofmt_ctx->oformat->flags & AVFMT_NOFILE)) {
  
          ret = avio_open(&_ofmt_ctx->pb, openFileURL.fileSystemRepresentation, AVIO_FLAG_WRITE);
  
          if (ret < 0) {
  
              av_log(NULL, AV_LOG_ERROR, "Could not open output file '%s'", filename);
  
              return ret;
  
          }
  
      }
  
  
  
      /* init muxer, write output file header */
  
      ret = avformat_write_header(_ofmt_ctx, NULL);
  
      if (ret < 0) {
  
          av_log(NULL, AV_LOG_ERROR, "Error occurred when opening output file\n");
  
          return ret;
  
      }
  
  
  
      return 0;
  
  }

  These two methods deal with initialising the filters and filtering.

  int init_filters(void) {
  
      const char *filter_spec;
  
      unsigned int i;
  
      int ret;
  
      _filter_ctx = 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  = NULL;
  
          _filter_ctx[i].buffersink_ctx = NULL;
  
          _filter_ctx[i].filter_graph   = NULL;
  
          if (!(_ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO
  
                || _ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO))
  
              continue;
  
  
  
  
  
          if (_ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
  
              filter_spec = "null"; /* passthrough (dummy) filter for video */
  
          else
  
              filter_spec = "anull"; /* passthrough (dummy) filter for audio */
  
          ret = init_filter(&_filter_ctx[i], _ifmt_ctx->streams[i]->codec,
  
                            _ofmt_ctx->streams[i]->codec, filter_spec);
  
          if (ret)
  
              return ret;
  
      }
  
      return 0;
  
  }
  
  int init_filter(FilteringContext* fctx, AVCodecContext *dec_ctx, AVCodecContext *enc_ctx, const char *filter_spec) {
  
      char args[512];
  
      int ret = 0;
  
      AVFilter *buffersrc = NULL;
  
      AVFilter *buffersink = NULL;
  
      AVFilterContext *buffersrc_ctx = NULL;
  
      AVFilterContext *buffersink_ctx = NULL;
  
      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) {
  
              av_log(NULL, AV_LOG_ERROR, "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, NULL, filter_graph);
  
          if (ret < 0) {
  
              av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n");
  
              goto end;
  
          }
  
  
  
          ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
  
                                             NULL, NULL, filter_graph);
  
          if (ret < 0) {
  
              av_log(NULL, AV_LOG_ERROR, "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) {
  
              av_log(NULL, AV_LOG_ERROR, "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) {
  
              av_log(NULL, AV_LOG_ERROR, "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, NULL, filter_graph);
  
          if (ret < 0) {
  
              av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer source\n");
  
              goto end;
  
          }
  
  
  
          ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
  
                                             NULL, NULL, filter_graph);
  
          if (ret < 0) {
  
              av_log(NULL, AV_LOG_ERROR, "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) {
  
              av_log(NULL, AV_LOG_ERROR, "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) {
  
              av_log(NULL, AV_LOG_ERROR, "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) {
  
              av_log(NULL, AV_LOG_ERROR, "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       = NULL;
  
  
  
      inputs->name       = av_strdup("out");
  
      inputs->filter_ctx = buffersink_ctx;
  
      inputs->pad_idx    = 0;
  
      inputs->next       = NULL;
  
  
  
      if (!outputs->name || !inputs->name) {
  
          ret = AVERROR(ENOMEM);
  
          goto end;
  
      }
  
  
  
      if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec,
  
                                          &inputs, &outputs, NULL)) < 0)
  
          goto end;
  
  
  
      if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
  
          goto end;
  
  
  
      /* Fill FilteringContext */
  
      fctx->buffersrc_ctx = buffersrc_ctx;
  
      fctx->buffersink_ctx = buffersink_ctx;
  
      fctx->filter_graph = filter_graph;
  
  
  
  end:
  
      avfilter_inout_free(&inputs);
  
      avfilter_inout_free(&outputs);
  
  
  
      return ret;
  
  }

  Finally these two methods take care of writing the frames.

  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]->codec->codec_type ==
  
       AVMEDIA_TYPE_VIDEO) ? avcodec_encode_video2 : avcodec_encode_audio2;
  
  
  
      if (!got_frame)
  
          got_frame = &got_frame_local;
  
  
  
      av_log(NULL, AV_LOG_INFO, "Encoding frame\n");
  
      /* encode filtered frame */
  
      enc_pkt.data = NULL;
  
      enc_pkt.size = 0;
  
      av_init_packet(&enc_pkt);
  
      ret = enc_func(_ofmt_ctx->streams[stream_index]->codec, &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,
  
                           _ofmt_ctx->streams[stream_index]->codec->time_base,
  
                           _ofmt_ctx->streams[stream_index]->time_base);
  
  
  
      av_log(NULL, AV_LOG_DEBUG, "Muxing frame\n");
  
      /* mux encoded frame */
  
      ret = av_interleaved_write_frame(_ofmt_ctx, &enc_pkt);
  
      return ret;
  
  }
  
  int filter_encode_write_frame(AVFrame *frame, unsigned int stream_index)
  
  {
  
      int ret;
  
      AVFrame *filt_frame;
  
  
  
      av_log(NULL, AV_LOG_INFO, "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) {
  
          av_log(NULL, AV_LOG_ERROR, "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;
  
          }
  
          av_log(NULL, AV_LOG_INFO, "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, NULL);
  
          if (ret < 0)
  
              break;
  
      }
  
  
  
      return ret;
  
  }

• avcodec/cabac_functions : Fix "left shift of negative value -31767"

  27 novembre 2015, par Michael Niedermayer

  avcodec/cabac_functions : Fix "left shift of negative value -31767"
  Fixes : 1430e9c43fae47a24c179c7c54f94918/signal_sigsegv_421427_2340_591e9810c7b09efe501ad84638c9e9f8.264
  Found-by : Mateusz "j00ru" Jurczyk and Gynvael Coldwind
  
  Found-by : xiedingbao (Ticket4727)
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/cabac_functions.h