Recherche avancée

Sur d’autres sites (4598)

• Displaying the current frame of a video after skipping using drawtext/start_number not evaluation any variables

  30 mars 2017, par DJ Quardaboff

  I would like to display the current frame number on a video while playing it with ffplay. I have already seen this solution, but when I seek to any part of the video, the counter resets. There’s a variable, start_number, which the ffplay documentation says is The starting frame number for the n/frame_num variable. The default value is "0". It seems that n is set to that when starting the video or seeking between I-frames. I thought setting this variable to %{floor(t*60)} would solve my problem, but after running this :

  ffplay -i "video.mp4" -vf drawtext="fontsize=30:box=1:boxcolor=white:fontcolor=black:fontfile=/Windows/Fonts/arial.ttf:start_number=floor(t*60):text=%{n}"

  I got the following console output :

  ffplay version N-84679-gd65b595 Copyright (c) 2003-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 51.100 / 55. 51.100
  
    libavcodec     57. 86.103 / 57. 86.103
  
    libavformat    57. 67.100 / 57. 67.100
  
    libavdevice    57.  3.101 / 57.  3.101
  
    libavfilter     6. 78.100 /  6. 78.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':=    0B f=0/0
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 2017-03-30T02:49:20.000000Z
  
      encoder         : Open Broadcaster Software v0.659b
  
    Duration: 00:05:36.85, start: 0.000000, bitrate: 72636 kb/s
  
      Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 162 kb/s (default)
  
      Metadata:
  
    creation_time   : 2017-03-30T02:49:20.000000Z
  
    handler_name    : Sound Media Handler
  
  Stream #0:1(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/iec61966-2-1), 2560x1440, 72465 kb/s, 60 fps, 60 tbr, 1k tbn, 120 tbc (default)
  
  Metadata:
  
    creation_time   : 2017-03-30T02:49:20.000000Z
  
    handler_name    : Video Media Handler
  
    encoder         : AVC Coding
  
  [drawtext @ 00000000122770e0] [Eval @ 0000000008f3eb60] Undefined constant or missing '(' in 't*60)'
  
  [drawtext @ 00000000122770e0] Unable to parse option value "floor(t*60)"
  
  [drawtext @ 00000000122770e0] [Eval @ 0000000008f3ebd0] Undefined constant or missing '(' in 't*60)'
  
  [drawtext @ 00000000122770e0] Unable to parse option value "floor(t*60)"
  
  [drawtext @ 00000000122770e0] Error setting option start_number to value floor(t*60).
  
  [Parsed_drawtext_0 @ 000000000263eca0] Error applying options to the filter.
  
  Error initializing filter 'drawtext' with args 'fontsize=30:box=1:boxcolor=white:fontcolor=black:fontfile=/Windows/Fonts/arial.ttf:start_number=floor(t*60):text=%{n}'
  
     0.01 A-V:    nan fd=   0 aq=   22KB vq= 5866KB sq=    0B f=0/0

  In fact, any variable in start_number’s assignment invokes this error. I don’t know if I have the correct syntax, but does this mean it doesn’t evaluate expressions ? Or maybe it doesn’t accept variables for some reason ?

  After that downer I tried just setting the text to %{t}, which played the video, but repeatedly gave this error and had no text in the top left corner :

  [Parsed_drawtext_0 @ 0000000003e54ea0] %{t} is not known 0B f=0/0

  So does the current time variable just not work in drawtext ?
  Is there another way to write the current frame on the video or even on the console window ?

  Using Windows 10 Enterprise and the latest build of ffplay for windows at this time.

• ffmpeg streaming to youtube slow

  1er avril 2017, par boygiandi

  I’m trying to send a video file to youtube as livestreaming. The stream command look like this

  ffmpeg -re -i "/tmp/4745.mkv" -acodec aac -pix_fmt yuv420p -bufsize 6000k -vb 400k -maxrate 1500k -deinterlace -vcodec libx264 -preset fast -g 60 -r 30 -crf 1 -f flv "rtmp ://...."

  The last line of output log look like this

  [ sh : 2017-04-01 7:19:54 ]size= 242706kB time=00:21:08.11 bitrate=1567.9kbits/s speed=0.882x

  As I understand, the speed=0.882x mean it send data to youtube slower than expected ( 1x mean streaming fine, lower mean buffering ). I tried to change some params of ffmpeg command, like change -preset fast to superfast, ultrafast : it faster but quality very bad and I still can’t control the out put speed. Sometime it’s 1x, sometime lower.
  Note that I run more than 1 ffmpeg instants at the same time, it may problem of CPU, RAM or Network, I checked them all.

  • CPU 40% ( top command )
  • RAM used 3Gb/7Gb
  • Network upload Avg : 8.45 MBit/s ( Max Upload : 70.76 Mbit/s - speedtest )

  So I don’t know what’s problem. Anyone can help ?

• FFmpeg encoding produces slightly incompatible MKV/MP4 container

  11 juin 2018, par james2048

  I’ve been using the FFmpeg libraries to read and write media files using the C API.

  So far, reading seems to be pretty straightforward. I am able to read frames which I can then process, convert to RGB, process, and then convert back to YUV420 to be encoded.

  The encoded files play back with VLC media player fine, and Windows Media Player if I have a codec pack installed. However, they do behave strangely : the stock Windows 10 player won’t play them, same for Adobe Premiere. Also thumbnailers don’t work on it.
  Basically it seems like nothing other than VLC or FFmpeg itself can play/process the file. I have seen this with both MP4 and MKV, so it is not a format-specific issue.

  The problems go away once you remux the file with FFmpeg, for example "ffmpeg -i input.mkv -c copy output.mkv". Everything can play the file correctly.
  Also, the "remuxing.c" sample from the official samples works as well, with the same library version and compilers that I’m using (Visual Studio 2017, FFmpeg compiled with MinGW). It will fix the file and make it playable in all software.

  I’m not sure what could be causing this. I also don’t understand what the remuxing "fixed". It must be a container issue as the frames aren’t touched by remuxing.
  I have analysed the output MKVs with FFprobe -show_packets. It seems to have budged the packet timestamps a little constant factor, and the output stream now has
  is_avc=true and nal_length_size=4 instead of is_avc=false and nal_length_size=0, but apart from that the files are identical.

  Now here’s the output of FFprobe with the 3 last test packets, stream info and format info for both streams. As you can see, they are identical except for a couple of field. But something in here must have been "fixed" during remuxing to make it work.

  [PACKET]
  
  codec_type=video
  
  stream_index=0
  
  pts=59050
  
  pts_time=59.050000
  
  dts=58890
  
  dts_time=58.890000
  
  duration=1
  
  duration_time=0.001000
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=427
  
  pos=277358
  
  flags=__
  
  [/PACKET]
  
  [PACKET]
  
  codec_type=video
  
  stream_index=0
  
  pts=58970
  
  pts_time=58.970000
  
  dts=58970
  
  dts_time=58.970000
  
  duration=1
  
  duration_time=0.001000
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=205
  
  pos=277792
  
  flags=__
  
  [/PACKET]
  
  [PACKET]
  
  codec_type=video
  
  stream_index=0
  
  pts=59130
  
  pts_time=59.130000
  
  dts=59050
  
  dts_time=59.050000
  
  duration=1
  
  duration_time=0.001000
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=268
  
  pos=278004
  
  flags=__
  
  [/PACKET]
  
  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=Main
  
  codec_type=video
  
  codec_time_base=1/2000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  width=720
  
  height=576
  
  coded_width=720
  
  coded_height=576
  
  has_b_frames=2
  
  sample_aspect_ratio=N/A
  
  display_aspect_ratio=N/A
  
  pix_fmt=yuv420p
  
  level=50
  
  color_range=unknown
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  field_order=progressive
  
  timecode=N/A
  
  refs=1
  
  is_avc=false
  
  nal_length_size=0
  
  id=N/A
  
  r_frame_rate=299/12
  
  avg_frame_rate=1000/1
  
  time_base=1/1000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=N/A
  
  duration=N/A
  
  bit_rate=N/A
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=737
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:DURATION=00:00:59.211000000
  
  [/STREAM]
  
  [FORMAT]
  
  filename=testEncLeft.mkv
  
  nb_streams=1
  
  nb_programs=0
  
  format_name=matroska,webm
  
  format_long_name=Matroska / WebM
  
  start_time=0.000000
  
  duration=59.211000
  
  size=278349
  
  bit_rate=37607
  
  probe_score=100
  
  TAG:COMMENT=Slickline Player Export
  
  TAG:ENCODER=Lavf57.83.100
  
  [/FORMAT]

  And the info after remuxing, which works :

  [PACKET]
  
  codec_type=video
  
  stream_index=0
  
  pts=59050
  
  pts_time=59.050000
  
  dts=58890
  
  dts_time=58.890000
  
  duration=1
  
  duration_time=0.001000
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=427
  
  pos=277418
  
  flags=__
  
  [/PACKET]
  
  [PACKET]
  
  codec_type=video
  
  stream_index=0
  
  pts=58970
  
  pts_time=58.970000
  
  dts=58970
  
  dts_time=58.970000
  
  duration=1
  
  duration_time=0.001000
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=205
  
  pos=277852
  
  flags=__
  
  [/PACKET]
  
  [PACKET]
  
  codec_type=video
  
  stream_index=0
  
  pts=59130
  
  pts_time=59.130000
  
  dts=59050
  
  dts_time=59.050000
  
  duration=1
  
  duration_time=0.001000
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=268
  
  pos=278064
  
  flags=__
  
  [/PACKET]
  
  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=Main
  
  codec_type=video
  
  codec_time_base=1/2000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  width=720
  
  height=576
  
  coded_width=720
  
  coded_height=576
  
  has_b_frames=2
  
  sample_aspect_ratio=N/A
  
  display_aspect_ratio=N/A
  
  pix_fmt=yuv420p
  
  level=50
  
  color_range=unknown
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  field_order=progressive
  
  timecode=N/A
  
  refs=1
  
  is_avc=true
  
  nal_length_size=4
  
  id=N/A
  
  r_frame_rate=299/12
  
  avg_frame_rate=1000/1
  
  time_base=1/1000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=N/A
  
  duration=N/A
  
  bit_rate=N/A
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=737
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:DURATION=00:00:59.212000000
  
  [/STREAM]
  
  [FORMAT]
  
  filename=fixedLeft.mkv
  
  nb_streams=1
  
  nb_programs=0
  
  format_name=matroska,webm
  
  format_long_name=Matroska / WebM
  
  start_time=0.000000
  
  duration=59.212000
  
  size=278409
  
  bit_rate=37615
  
  probe_score=100
  
  TAG:COMMENT=Slickline Player Export
  
  TAG:ENCODER=Lavf58.12.100
  
  [/FORMAT]

  Here is how I’m setting up the output context, for reference : it’s pretty standard, following the sample code.

  int ret;
  
  
  
  avformat_alloc_output_context2(&outputFormatCtx, nullptr, nullptr, outFilePath.c_str());
  
  
  
  av_dict_set(&outputFormatCtx->metadata, "comment", "FFmpeg Export", 0);
  
  
  
  if (!outputFormatCtx)
  
  {
  
      LOG_AND_THROW("Could not allocate output context");
  
  }
  
  
  
  outputVideoStream = avformat_new_stream(outputFormatCtx, nullptr);
  
  outputVideoStream->time_base = AVRational{ 1, AV_TIME_BASE }; // Stream timebase will be used by codec
  
  
  
  if (!outputVideoStream)
  
  {
  
      LOG_AND_THROW("Failed allocating output stream");
  
  }
  
  
  
  // defaults to "libx264"
  
  AVCodec *outCodec = avcodec_find_encoder_by_name(selectedCodecName.c_str());
  
  
  
  if (!outCodec)
  
  {
  
      LOG_AND_THROW("Failed finding output codec");
  
  }
  
  
  
  AVDictionary *opts = nullptr;
  
  
  
  if (selectedCodecName == "libx264")
  
  {
  
      opts = getX264CodecOptions();
  
  }
  
  
  
  encoderCtx = avcodec_alloc_context3(outCodec);
  
  
  
  if (!encoderCtx)
  
  {
  
      LOG_AND_THROW("Failed to allocate the encoder context");
  
  }
  
  
  
  encoderCtx->width = width;
  
  encoderCtx->height = height;
  
  encoderCtx->pix_fmt = AV_PIX_FMT_YUV420P;
  
  // time base for the frames we will provide to the encoder
  
  encoderCtx->time_base = AVRational{ 1, AV_TIME_BASE };
  
  // convert framerate from double to rational
  
  encoderCtx->framerate = AVRational{ (int)(frameRate * AV_TIME_BASE), AV_TIME_BASE};
  
  
  
  // Match encoderCtx time base for the stream
  
  outputVideoStream->time_base = encoderCtx->time_base;
  
  
  
  ret = avcodec_open2(encoderCtx, outCodec, &opts);
  
  
  
  if (ret < 0)
  
  {
  
      LOG_AND_THROW_PARAM("Cannot open video encoder for stream: %d", ret);
  
  }
  
  
  
  // Fill in some params for MP4 stream, details about encoder
  
  ret = avcodec_parameters_from_context(outputVideoStream->codecpar, encoderCtx);
  
  
  
  if (ret < 0)
  
  {
  
      LOG_AND_THROW_PARAM("Failed to copy encoder parameters to output stream: %d", ret);
  
  }
  
  
  
  if (outputFormatCtx->oformat->flags & AVFMT_GLOBALHEADER)
  
  {
  
      encoderCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
  
  }
  
  
  
  av_dump_format(outputFormatCtx, 0, filePath.c_str(), 1);
  
  
  
  // End of encoder settings, setting up MP4
  
  if (!(outputFormatCtx->oformat->flags & AVFMT_NOFILE))
  
  {
  
      ret = avio_open(&outputFormatCtx->pb, outFilePath.c_str(), AVIO_FLAG_WRITE);
  
  
  
      if (ret < 0)
  
      {
  
          LOG_AND_THROW_PARAMSTR("Could not open output file '%s'", outFilePath.c_str());
  
      }
  
  }
  
  
  
  ret = avformat_write_header(outputFormatCtx, nullptr);
  
  
  
  if (ret < 0)
  
  {
  
      LOG_AND_THROW_PARAM("Error occurred when opening output file for writing: %d", ret);
  
  }

  Can anyone help me figure out why the container is not playing properly ?

  Thanks in advance.

  -James