Newest 'ffmpeg' Questions - Stack Overflow

Les articles publiés sur le site

• How to change metadata with ffmpeg/avconv without creating a new file ?

  16 mars, par Stephan Kulla

  I am writing a python script for producing audio and video podcasts. There are a bunch of recorded media files (audio and video) and text files containing the meta information.

  Now I want to program a function which shall add the information from the meta data text files to all media files (the original and the converted ones). Because I have to handle many different file formats (wav, flac, mp3, mp4, ogg, ogv...) it would be great to have a tool which add meta data to arbitrary formats.

  My Question:

  How can I change the metadata of a file with ffmpeg/avconv without changing the audio or video of it and without creating a new file? Is there another commandline/python tool which would do the job for me?

  What I tried so far:

  I thought ffmpeg/avconv could be such a tool, because it can handle nearly all media formats. I hoped, that if I set -i input_file and the output_file to the same file, ffmpeg/avconv will be smart enough to leave the file unchanged. Then I could set -metadata key=value and just the metadata will be changed.

  But I noticed, that if I type avconv -i test.mp3 -metadata title='Test title' test.mp3 the audio test.mp3 will be reconverted in another bitrate.

  So I thought to use -c copy to copy all video and audio information. Unfortunately also this does not work:

  :~$ du -h test.wav # test.wav is 303 MB big
  303M    test.wav
  
  :~$ avconv -i test.wav -c copy -metadata title='Test title' test.wav
  avconv version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the
  Libav    developers
  built on Jun 12 2012 16:37:58 with gcc 4.6.3
  [wav @ 0x846b260] max_analyze_duration reached
  Input #0, wav, from 'test.wav':
  Duration: 00:29:58.74, bitrate: 1411 kb/s
      Stream #0.0: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
  File 'test.wav' already exists. Overwrite ? [y/N] y
  Output #0, wav, to 'test.wav':
  Metadata:
      title           : Test title
      encoder         : Lavf53.21.0
      Stream #0.0: Audio: pcm_s16le, 44100 Hz, 2 channels, 1411 kb/s
  Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Press ctrl-c to stop encoding
  size=     896kB time=5.20 bitrate=1411.3kbits/s    
  video:0kB audio:896kB global headers:0kB muxing overhead 0.005014%
  
  :~$ du -h test.wav # file size of test.wav changed dramatically
  900K    test.wav
  

  You see, that I cannot use -c copy if input_file and output_file are the same. Of course I could produce a temporarily file:

  :-$ avconv -i test.wav -c copy -metadata title='Test title' test_temp.mp3
  :-$ mv test_tmp.mp3 test.mp3
  

  But this solution would create (temporarily) a new file on the filesystem and is therefore not preferable.

• Can m3u8 files have mp4 file urls ?

  15 mars, par 89neuron

  I am in a situation where I have my flv video converted to mp4 and then I am streaming this as http url using my nginx server. For multibitrate supoport on html5 I have created a m3u8 file like this :

  #EXTM3U
  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=200111, RESOLUTION=512x288
  http://streamer.abc.com:8080/videos/arvind1.mp4
  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=3000444, RESOLUTION=400x300
  http://streamer.abc.com:8080/videos/arvind1.mp4
  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=400777, RESOLUTION=400x300
  http://streamer.abc.com:8080/videos/arvind1.mp4
  #EXT-X-ENDLIST
  

  But jwplayer is not playing this saying playlist not loaded. Specifically "No playable sources found". Please help.

• Using FFmpeg encode and UDP with a Webcam ?

  14 mars, par Rendres

  I'm trying to get frames from a Webcam using OpenCV, encode them with FFmpeg and send them using UDP.

  I did before a similar project that instead of sending the packets with UDP, it saved them in a video file.

  My code is.

  #include 
  #include 
  #include 
  #include 
  
  extern "C" {
  #include avcodec.h>
  #include avformat.h>
  #include opt.h>
  #include imgutils.h>
  #include mathematics.h>
  #include swscale.h>
  #include swresample.h>
  }
  
  #include opencv.hpp>
  
  using namespace std;
  using namespace cv;
  
  #define WIDTH 640
  #define HEIGHT 480
  #define CODEC_ID AV_CODEC_ID_H264
  #define STREAM_PIX_FMT AV_PIX_FMT_YUV420P
  
  static AVFrame *frame, *pFrameBGR;
  
  int main(int argc, char **argv)
  {
  VideoCapture cap(0);
  const char *url = "udp://127.0.0.1:8080";
  
  AVFormatContext *formatContext;
  AVStream *stream;
  AVCodec *codec;
  AVCodecContext *c;
  AVDictionary *opts = NULL;
  
  int ret, got_packet;
  
  if (!cap.isOpened())
  {
      return -1;
  }
  
  av_log_set_level(AV_LOG_TRACE);
  
  av_register_all();
  avformat_network_init();
  
  avformat_alloc_output_context2(&formatContext, NULL, "h264", url);
  if (!formatContext)
  {
      av_log(NULL, AV_LOG_FATAL, "Could not allocate an output context for '%s'.\n", url);
  }
  
  codec = avcodec_find_encoder(CODEC_ID);
  if (!codec)
  {
      av_log(NULL, AV_LOG_ERROR, "Could not find encoder.\n");
  }
  
  stream = avformat_new_stream(formatContext, codec);
  
  c = avcodec_alloc_context3(codec);
  
  stream->id = formatContext->nb_streams - 1;
  stream->time_base = (AVRational){1, 25};
  
  c->codec_id = CODEC_ID;
  c->bit_rate = 400000;
  c->width = WIDTH;
  c->height = HEIGHT;
  c->time_base = stream->time_base;
  c->gop_size = 12;
  c->pix_fmt = STREAM_PIX_FMT;
  
  if (formatContext->flags & AVFMT_GLOBALHEADER)
      c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
  
  av_dict_set(&opts, "preset", "fast", 0);
  
  av_dict_set(&opts, "tune", "zerolatency", 0);
  
  ret = avcodec_open2(c, codec, NULL);
  if (ret < 0)
  {
      av_log(NULL, AV_LOG_ERROR, "Could not open video codec.\n");
  }
  
  pFrameBGR = av_frame_alloc();
  if (!pFrameBGR)
  {
      av_log(NULL, AV_LOG_ERROR, "Could not allocate video frame.\n");
  }
  
  frame = av_frame_alloc();
  if (!frame)
  {
      av_log(NULL, AV_LOG_ERROR, "Could not allocate video frame.\n");
  }
  
  frame->format = c->pix_fmt;
  frame->width = c->width;
  frame->height = c->height;
  
  ret = avcodec_parameters_from_context(stream->codecpar, c);
  if (ret < 0)
  {
      av_log(NULL, AV_LOG_ERROR, "Could not open video codec.\n");
  }
  
  av_dump_format(formatContext, 0, url, 1);
  
  ret = avformat_write_header(formatContext, NULL);
  if (ret != 0)
  {
      av_log(NULL, AV_LOG_ERROR, "Failed to connect to '%s'.\n", url);
  }
  
  Mat image(Size(HEIGHT, WIDTH), CV_8UC3);
  SwsContext *swsctx = sws_getContext(WIDTH, HEIGHT, AV_PIX_FMT_BGR24, WIDTH, HEIGHT, AV_PIX_FMT_YUV420P, SWS_BILINEAR, NULL, NULL, NULL);
  int frame_pts = 0;
  
  while (1)
  {
      cap >> image;
  
      int numBytesYUV = av_image_get_buffer_size(STREAM_PIX_FMT, WIDTH, HEIGHT, 1);
      uint8_t *bufferYUV = (uint8_t *)av_malloc(numBytesYUV * sizeof(uint8_t));
  
      avpicture_fill((AVPicture *)pFrameBGR, image.data, AV_PIX_FMT_BGR24, WIDTH, HEIGHT);
      avpicture_fill((AVPicture *)frame, bufferYUV, STREAM_PIX_FMT, WIDTH, HEIGHT);
  
      sws_scale(swsctx, (uint8_t const *const *)pFrameBGR->data, pFrameBGR->linesize, 0, HEIGHT, frame->data, frame->linesize);
  
      AVPacket pkt = {0};
      av_init_packet(&pkt);
  
      frame->pts = frame_pts;
  
      ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
      if (ret < 0)
      {
          av_log(NULL, AV_LOG_ERROR, "Error encoding frame\n");
      }
  
      if (got_packet)
      {
          pkt.pts = av_rescale_q_rnd(pkt.pts, c->time_base, stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
          pkt.dts = av_rescale_q_rnd(pkt.dts, c->time_base, stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
          pkt.duration = av_rescale_q(pkt.duration, c->time_base, stream->time_base);
          pkt.stream_index = stream->index;
  
          return av_interleaved_write_frame(formatContext, &pkt);
  
          cout << "Seguro que si" << endl;
      }
      frame_pts++;
  }
  
  avcodec_free_context(&c);
  av_frame_free(&frame);
  avformat_free_context(formatContext);
  
  return 0;
  }
  

  The code compiles but it returns Segmentation fault in the function av_interleaved_write_frame(). I've tried several implementations or several codecs (in this case I'm using libopenh264, but using mpeg2video returns the same segmentation fault). I tried also with av_write_frame() but it returns the same error.

  As I told before, I only want to grab frames from a webcam connected via USB, encode them to H264 and send the packets through UDP to another PC.

  My console log when I run the executable is.

  [100%] Built target display
  [OpenH264] this = 0x0x244b4f0, Info:CWelsH264SVCEncoder::SetOption():ENCODER_OPTION_TRACE_CALLBACK callback = 0x7f0c302a87c0.
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:CWelsH264SVCEncoder::InitEncoder(), openh264 codec version = 5a5c4f1
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:iUsageType = 0,iPicWidth= 640;iPicHeight= 480;iTargetBitrate= 400000;iMaxBitrate= 400000;iRCMode= 0;iPaddingFlag= 0;iTemporalLayerNum= 1;iSpatialLayerNum= 1;fFrameRate= 25.000000f;uiIntraPeriod= 12;eSpsPpsIdStrategy = 0;bPrefixNalAddingCtrl = 0;bSimulcastAVC=0;bEnableDenoise= 0;bEnableBackgroundDetection= 1;bEnableSceneChangeDetect = 1;bEnableAdaptiveQuant= 1;bEnableFrameSkip= 0;bEnableLongTermReference= 0;iLtrMarkPeriod= 30, bIsLosslessLink=0;iComplexityMode = 0;iNumRefFrame = 1;iEntropyCodingModeFlag = 0;uiMaxNalSize = 0;iLTRRefNum = 0;iMultipleThreadIdc = 1;iLoopFilterDisableIdc = 0 (offset(alpha/beta): 0,0;iComplexityMode = 0,iMaxQp = 51;iMinQp = 0)
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:sSpatialLayers[0]: .iVideoWidth= 640; .iVideoHeight= 480; .fFrameRate= 25.000000f; .iSpatialBitrate= 400000; .iMaxSpatialBitrate= 400000; .sSliceArgument.uiSliceMode= 1; .sSliceArgument.iSliceNum= 0; .sSliceArgument.uiSliceSizeConstraint= 1500;uiProfileIdc = 66;uiLevelIdc = 41
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Warning:SliceArgumentValidationFixedSliceMode(), unsupported setting with Resolution and uiSliceNum combination under RC on! So uiSliceNum is changed to 6!
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:Setting MaxSpatialBitrate (400000) the same at SpatialBitrate (400000) will make the    actual bit rate lower than SpatialBitrate
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Warning:bEnableFrameSkip = 0,bitrate can't be controlled for RC_QUALITY_MODE,RC_BITRATE_MODE and RC_TIMESTAMP_MODE without enabling skip frame.
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Warning:Change QP Range from(0,51) to (12,42)
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:WELS CPU features/capacities (0x4007fe3f) detected:   HTT:      Y, MMX:      Y, MMXEX:    Y, SSE:      Y, SSE2:     Y, SSE3:     Y, SSSE3:    Y, SSE4.1:   Y, SSE4.2:   Y, AVX:      Y, FMA:      Y, X87-FPU:  Y, 3DNOW:    N, 3DNOWEX:  N, ALTIVEC:  N, CMOV:     Y, MOVBE:    Y, AES:      Y, NUMBER OF LOGIC PROCESSORS ON CHIP: 8, CPU CACHE LINE SIZE (BYTES):        64
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:WelsInitEncoderExt() exit, overall memory usage: 4542878 bytes
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:WelsInitEncoderExt(), pCtx= 0x0x245a400.
  Output #0, h264, to 'udp://192.168.100.39:8080':
  Stream #0:0, 0, 1/25: Video: h264 (libopenh264), 1 reference frame, yuv420p, 640x480 (0x0), 0/1, q=2-31, 400 kb/s, 25 tbn
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:RcUpdateIntraComplexity iFrameDqBits = 385808,iQStep= 2016,iIntraCmplx = 777788928
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:[Rc]Layer 0: Frame timestamp = 0, Frame type = 2, encoding_qp = 30, average qp = 30, max qp = 33, min qp = 27, index = 0, iTid = 0, used = 385808, bitsperframe = 16000, target = 64000, remainingbits = -257808, skipbuffersize = 200000
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:WelsEncoderEncodeExt() OutputInfo iLayerNum = 2,iFrameSize = 48252
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:WelsEncoderEncodeExt() OutputInfo iLayerId = 0,iNalType = 0,iNalCount = 2, first Nal Length=18,uiSpatialId = 0,uiTemporalId = 0,iSubSeqId = 0
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:WelsEncoderEncodeExt() OutputInfo iLayerId = 1,iNalType = 1,iNalCount = 6, first Nal Length=6057,uiSpatialId = 0,uiTemporalId = 0,iSubSeqId = 0
  [libopenh264 @ 0x244aa00] 6 slices
  ./scriptBuild.sh: line 20: 10625 Segmentation fault      (core dumped) ./display
  

  As you can see, FFmpeg uses libopenh264 and configures it correctly. However, no matter what. It always returns the same Segmentation fault error...

  I've used commands like this.

  ffmpeg -s 640x480 -f video4linux2 -i /dev/video0 -r 30 -vcodec libopenh264 -an -f h264 udp://127.0.0.1:8080
  

  And it works perfectly, but I need to process the frames before sending them. Thats why I'm trying to use the libs.

  My FFmpeg version is.

  ffmpeg version 3.3.6 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  configuration: --disable-yasm --enable-shared --enable-libopenh264 --cc='gcc -fPIC'
  libavutil      55. 58.100 / 55. 58.100
  libavcodec     57. 89.100 / 57. 89.100
  libavformat    57. 71.100 / 57. 71.100
  libavdevice    57.  6.100 / 57.  6.100
  libavfilter     6. 82.100 /  6. 82.100
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
  

  I tried to get more information of the error using gbd, but it didn't give me debugging info.

  How can I solve this problem?

• c++ - using FFmpeg encode and UDP with a Webcam

  14 mars, par Rendres

  I'm trying to get frames from a Webcam using OpenCV, encode them with FFmpeg and send them using UDP.

  I did before a similar project that instead of sending the packets with UDP, it saved them in a video file.

  My code is.

  #include 
  #include 
  #include 
  #include 
  
  extern "C" {
  #include avcodec.h>
  #include avformat.h>
  #include opt.h>
  #include imgutils.h>
  #include mathematics.h>
  #include swscale.h>
  #include swresample.h>
  }
  
  #include opencv.hpp>
  
  using namespace std;
  using namespace cv;
  
  #define WIDTH 640
  #define HEIGHT 480
  #define CODEC_ID AV_CODEC_ID_H264
  #define STREAM_PIX_FMT AV_PIX_FMT_YUV420P
  
  static AVFrame *frame, *pFrameBGR;
  
  int main(int argc, char **argv)
  {
  VideoCapture cap(0);
  const char *url = "udp://127.0.0.1:8080";
  
  AVFormatContext *formatContext;
  AVStream *stream;
  AVCodec *codec;
  AVCodecContext *c;
  AVDictionary *opts = NULL;
  
  int ret, got_packet;
  
  if (!cap.isOpened())
  {
      return -1;
  }
  
  av_log_set_level(AV_LOG_TRACE);
  
  av_register_all();
  avformat_network_init();
  
  avformat_alloc_output_context2(&formatContext, NULL, "h264", url);
  if (!formatContext)
  {
      av_log(NULL, AV_LOG_FATAL, "Could not allocate an output context for '%s'.\n", url);
  }
  
  codec = avcodec_find_encoder(CODEC_ID);
  if (!codec)
  {
      av_log(NULL, AV_LOG_ERROR, "Could not find encoder.\n");
  }
  
  stream = avformat_new_stream(formatContext, codec);
  
  c = avcodec_alloc_context3(codec);
  
  stream->id = formatContext->nb_streams - 1;
  stream->time_base = (AVRational){1, 25};
  
  c->codec_id = CODEC_ID;
  c->bit_rate = 400000;
  c->width = WIDTH;
  c->height = HEIGHT;
  c->time_base = stream->time_base;
  c->gop_size = 12;
  c->pix_fmt = STREAM_PIX_FMT;
  
  if (formatContext->flags & AVFMT_GLOBALHEADER)
      c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
  
  av_dict_set(&opts, "preset", "fast", 0);
  
  av_dict_set(&opts, "tune", "zerolatency", 0);
  
  ret = avcodec_open2(c, codec, NULL);
  if (ret < 0)
  {
      av_log(NULL, AV_LOG_ERROR, "Could not open video codec.\n");
  }
  
  pFrameBGR = av_frame_alloc();
  if (!pFrameBGR)
  {
      av_log(NULL, AV_LOG_ERROR, "Could not allocate video frame.\n");
  }
  
  frame = av_frame_alloc();
  if (!frame)
  {
      av_log(NULL, AV_LOG_ERROR, "Could not allocate video frame.\n");
  }
  
  frame->format = c->pix_fmt;
  frame->width = c->width;
  frame->height = c->height;
  
  ret = avcodec_parameters_from_context(stream->codecpar, c);
  if (ret < 0)
  {
      av_log(NULL, AV_LOG_ERROR, "Could not open video codec.\n");
  }
  
  av_dump_format(formatContext, 0, url, 1);
  
  ret = avformat_write_header(formatContext, NULL);
  if (ret != 0)
  {
      av_log(NULL, AV_LOG_ERROR, "Failed to connect to '%s'.\n", url);
  }
  
  Mat image(Size(HEIGHT, WIDTH), CV_8UC3);
  SwsContext *swsctx = sws_getContext(WIDTH, HEIGHT, AV_PIX_FMT_BGR24, WIDTH, HEIGHT, AV_PIX_FMT_YUV420P, SWS_BILINEAR, NULL, NULL, NULL);
  int frame_pts = 0;
  
  while (1)
  {
      cap >> image;
  
      int numBytesYUV = av_image_get_buffer_size(STREAM_PIX_FMT, WIDTH, HEIGHT, 1);
      uint8_t *bufferYUV = (uint8_t *)av_malloc(numBytesYUV * sizeof(uint8_t));
  
      avpicture_fill((AVPicture *)pFrameBGR, image.data, AV_PIX_FMT_BGR24, WIDTH, HEIGHT);
      avpicture_fill((AVPicture *)frame, bufferYUV, STREAM_PIX_FMT, WIDTH, HEIGHT);
  
      sws_scale(swsctx, (uint8_t const *const *)pFrameBGR->data, pFrameBGR->linesize, 0, HEIGHT, frame->data, frame->linesize);
  
      AVPacket pkt = {0};
      av_init_packet(&pkt);
  
      frame->pts = frame_pts;
  
      ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
      if (ret < 0)
      {
          av_log(NULL, AV_LOG_ERROR, "Error encoding frame\n");
      }
  
      if (got_packet)
      {
          pkt.pts = av_rescale_q_rnd(pkt.pts, c->time_base, stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
          pkt.dts = av_rescale_q_rnd(pkt.dts, c->time_base, stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
          pkt.duration = av_rescale_q(pkt.duration, c->time_base, stream->time_base);
          pkt.stream_index = stream->index;
  
          return av_interleaved_write_frame(formatContext, &pkt);
  
          cout << "Seguro que si" << endl;
      }
      frame_pts++;
  }
  
  avcodec_free_context(&c);
  av_frame_free(&frame);
  avformat_free_context(formatContext);
  
  return 0;
  }
  

  The code compiles but it returns Segmentation fault in the function av_interleaved_write_frame(). I've tried several implementations or several codecs (in this case I'm using libopenh264, but using mpeg2video returns the same segmentation fault). I tried also with av_write_frame() but it returns the same error.

  As I told before, I only want to grab frames from a webcam connected via USB, encode them to H264 and send the packets through UDP to another PC.

  My console log when I run the executable is.

  [100%] Built target display
  [OpenH264] this = 0x0x244b4f0, Info:CWelsH264SVCEncoder::SetOption():ENCODER_OPTION_TRACE_CALLBACK callback = 0x7f0c302a87c0.
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:CWelsH264SVCEncoder::InitEncoder(), openh264 codec version = 5a5c4f1
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:iUsageType = 0,iPicWidth= 640;iPicHeight= 480;iTargetBitrate= 400000;iMaxBitrate= 400000;iRCMode= 0;iPaddingFlag= 0;iTemporalLayerNum= 1;iSpatialLayerNum= 1;fFrameRate= 25.000000f;uiIntraPeriod= 12;eSpsPpsIdStrategy = 0;bPrefixNalAddingCtrl = 0;bSimulcastAVC=0;bEnableDenoise= 0;bEnableBackgroundDetection= 1;bEnableSceneChangeDetect = 1;bEnableAdaptiveQuant= 1;bEnableFrameSkip= 0;bEnableLongTermReference= 0;iLtrMarkPeriod= 30, bIsLosslessLink=0;iComplexityMode = 0;iNumRefFrame = 1;iEntropyCodingModeFlag = 0;uiMaxNalSize = 0;iLTRRefNum = 0;iMultipleThreadIdc = 1;iLoopFilterDisableIdc = 0 (offset(alpha/beta): 0,0;iComplexityMode = 0,iMaxQp = 51;iMinQp = 0)
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:sSpatialLayers[0]: .iVideoWidth= 640; .iVideoHeight= 480; .fFrameRate= 25.000000f; .iSpatialBitrate= 400000; .iMaxSpatialBitrate= 400000; .sSliceArgument.uiSliceMode= 1; .sSliceArgument.iSliceNum= 0; .sSliceArgument.uiSliceSizeConstraint= 1500;uiProfileIdc = 66;uiLevelIdc = 41
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Warning:SliceArgumentValidationFixedSliceMode(), unsupported setting with Resolution and uiSliceNum combination under RC on! So uiSliceNum is changed to 6!
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:Setting MaxSpatialBitrate (400000) the same at SpatialBitrate (400000) will make the    actual bit rate lower than SpatialBitrate
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Warning:bEnableFrameSkip = 0,bitrate can't be controlled for RC_QUALITY_MODE,RC_BITRATE_MODE and RC_TIMESTAMP_MODE without enabling skip frame.
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Warning:Change QP Range from(0,51) to (12,42)
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:WELS CPU features/capacities (0x4007fe3f) detected:   HTT:      Y, MMX:      Y, MMXEX:    Y, SSE:      Y, SSE2:     Y, SSE3:     Y, SSSE3:    Y, SSE4.1:   Y, SSE4.2:   Y, AVX:      Y, FMA:      Y, X87-FPU:  Y, 3DNOW:    N, 3DNOWEX:  N, ALTIVEC:  N, CMOV:     Y, MOVBE:    Y, AES:      Y, NUMBER OF LOGIC PROCESSORS ON CHIP: 8, CPU CACHE LINE SIZE (BYTES):        64
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:WelsInitEncoderExt() exit, overall memory usage: 4542878 bytes
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:WelsInitEncoderExt(), pCtx= 0x0x245a400.
  Output #0, h264, to 'udp://192.168.100.39:8080':
  Stream #0:0, 0, 1/25: Video: h264 (libopenh264), 1 reference frame, yuv420p, 640x480 (0x0), 0/1, q=2-31, 400 kb/s, 25 tbn
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:RcUpdateIntraComplexity iFrameDqBits = 385808,iQStep= 2016,iIntraCmplx = 777788928
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:[Rc]Layer 0: Frame timestamp = 0, Frame type = 2, encoding_qp = 30, average qp = 30, max qp = 33, min qp = 27, index = 0, iTid = 0, used = 385808, bitsperframe = 16000, target = 64000, remainingbits = -257808, skipbuffersize = 200000
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:WelsEncoderEncodeExt() OutputInfo iLayerNum = 2,iFrameSize = 48252
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:WelsEncoderEncodeExt() OutputInfo iLayerId = 0,iNalType = 0,iNalCount = 2, first Nal Length=18,uiSpatialId = 0,uiTemporalId = 0,iSubSeqId = 0
  [libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:WelsEncoderEncodeExt() OutputInfo iLayerId = 1,iNalType = 1,iNalCount = 6, first Nal Length=6057,uiSpatialId = 0,uiTemporalId = 0,iSubSeqId = 0
  [libopenh264 @ 0x244aa00] 6 slices
  ./scriptBuild.sh: line 20: 10625 Segmentation fault      (core dumped) ./display
  

  As you can see, FFmpeg uses libopenh264 and configures it correctly. However, no matter what. It always returns the same Segmentation fault error...

  I've used commands like this.

  ffmpeg -s 640x480 -f video4linux2 -i /dev/video0 -r 30 -vcodec libopenh264 -an -f h264 udp://127.0.0.1:8080
  

  And it works perfectly, but I need to process the frames before sending them. Thats why I'm trying to use the libs.

  My FFmpeg version is.

  ffmpeg version 3.3.6 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  configuration: --disable-yasm --enable-shared --enable-libopenh264 --cc='gcc -fPIC'
  libavutil      55. 58.100 / 55. 58.100
  libavcodec     57. 89.100 / 57. 89.100
  libavformat    57. 71.100 / 57. 71.100
  libavdevice    57.  6.100 / 57.  6.100
  libavfilter     6. 82.100 /  6. 82.100
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
  

  I tried to get more information of the error using gbd, but it didn't give me debugging info.

  How can I solve this problem? I don't know what else can I try...

  Thank you!

• Discord bot : Fix ‘FFMPEG not found’

  14 mars, par Travis Sova

  I want to make my Discord bot join voice chat, but every time I run the command, I get an error message in the log(cmd) saying, FFMPEG not found.

  Picture of the error:

  

  This is the code:

  client.on('message', message => {
    // Voice only works in guilds, if the message does not come from a guild,
    // we ignore it
    if (!message.guild) return;
  
    if (message.content === '/join') {
      // Only try to join the sender's voice channel if they are in one themselves
      if (message.member.voiceChannel) {
        message.member.voiceChannel.join()
          .then(connection => { // Connection is an instance of VoiceConnection
            message.reply('I have successfully connected to the channel!');
          })
          .catch(console.log);
      } else {
        message.reply('You need to join a voice channel first!');
      }
    }
  });
  

  this is my package.json file:

  {
    "name": "x",
    "version": "1.0.0",
    "main": "index.js",
    "scripts": {
      "start": "node index.js",
      "dev": "nodemon index.js"
    },
    "dependencies": {
      "discord.js": "^11.4.2",
      "dotenv": "^6.2.0",
      "ffmpeg": "0.0.4",
      "opusscript": "0.0.6"
    },
    "devDependencies": {
      "nodemon": "^1.18.9"
    }
  }