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• Problem with ffplay from webcam stream using complex filters

  29 mai 2022, par efelbar

  I'm trying to stream video from a webcam (at /dev/video2) through ffplay to scale and recolor it, add some text, and then reduce the number of colors with palettes. I don't get any errors, but running the ffplay command :

  


  ffplay -i /dev/video2 -vf "hflip,\
  colorbalance=\
    rs=0.4:\
    bs=-0.4\
  ,\
  scale=\
    trunc(iw/8):\
    trunc(ih/8)\
  ,\
  drawtext=\
    text=\
      'efelbar':\
      fontcolor=white:\
      fontsize=10:\
      box=1:\
      boxcolor=black:\
      boxborderw=5:\
      x=(w-text_w)/2:\
      y=(h-text_h)/2\
  ,\
  split[s0][s1];\
  [s0]palettegen=\
    max_colors=16\
  [p];\
  [s1][p]paletteuse"


  


  seems to stall, and fails to produce video output.

  


  Running the simpler command ffplay -i /dev/video2 -vf "split[s0][s1];[s0]palettegen=max_colors=16[p];[s1][p]paletteuse", which takes a stream from a webcam and (should) reduce the number of colors, results in it just sitting there without showing the actual output stream. This might just be a performance issue because I'm on older hardware, but it doesn't give output relfective of that.

  


  The output of that command is as follows :

  


  ffplay version n5.0 Copyright (c) 2003-2022 the FFmpeg developers
  built with gcc 11.2.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-shared --enable-version3
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100
Input #0, video4linux2,v4l2, from '/dev/video2':B sq=    0B f=0/0   
  Duration: N/A, start: 254970.739108, bitrate: 147456 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn


  


  I'm running this on a thinkpad t420s, so I definitely wouldn't be surprised if my laptop just can't process video that quickly. If that is the case, suggestions for optimizations would be great !

  


• FFMPEG : Youtube streaming issues

  23 février 2019, par Alex Paramonov

  I am trying to make a reliable stream from my Icecast/Shoutcast servers to Youtube live.
  The command that I use is :

  /usr/bin/ffmpeg -re -loop 1 -framerate 1 -i /var/users/youtube_stream/DJ-philadelphia_jO46wsH.jpg -i http://127.0.0.1:4700/radio -c:v libx264 -preset ultrafast -maxrate 2048k -bufsize 2048k -c:a copy -ab 128k -s 1920x1080 -rtmp_live live -f flv rtmp://a.rtmp.youtube.com/live2/k123 -nostats

  The stream starts running but suddenly stops at random times with the output similar to this :

  av_interleaved_write_frame(): Broken pipe
  
  [flv @ 0x5641e04db260] Failed to update header with correct duration.
  
  [flv @ 0x5641e04db260] Failed to update header with correct filesize.
  
  Error writing trailer of rtmp://a.rtmp.youtube.com/live2/123: Broken pipe
  
  frame= 4771 fps=1.0 q=2.0 Lsize=  106465kB time=01:19:30.00 bitrate= 182.8kbits/s speed=   1x
  
  video:29022kB audio:74516kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.825971%
  
  Conversion failed!
  
  99%
  
  Exiting normally, received signal 15.

  I can’t say exactly why is this happening and maybe there is a way to fix it, but to mee it looks like ffmpeg can not send or convert some frame and it breaks the entire process, so I started digging the docs and found a fifo format that has reconnection options in case of failure.
  So my new command is :

  /usr/bin/ffmpeg -re -loop 1 -framerate 1 -i /var/users/youtube_stream/DJ-philadelphia_jO46wsH.jpg -i http://127.0.0.1:4700/radio -c:v libx264 -preset ultrafast -maxrate 2048k -bufsize 2048k -c:a copy -ab 128k -s 1920x1080 -rtmp_live live -f fifo -fifo_format flv -map 0:v -map 1:a -drop_pkts_on_overflow 1 -attempt_recovery 1 -recovery_wait_time 1 rtmp://a.rtmp.youtube.com/live2/123 -nostats

  With this command Youtube starts complaining about video resolution saying that 65535x65535 is not supported, value 65535 looks like something is not initialized properly. Please note that I have explicitly set the resolution with -s 1920x1080.

  The output from FLV and FIFO formats looks quite similar.

  FLV

  Input #0, image2, from '/var/users/youtube_stream/DJ-philadelphia_jO46wsH.jpg':
  
    Duration: 00:00:01.00, start: 0.000000, bitrate: 597 kb/s
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 1 fps, 1 tbr, 1 tbn, 1 tbc
  
  Input #1, mp3, from 'http://127.0.0.1:4700/radio':
  
    Metadata:
  
      icy-br          : 128
  
      icy-description : test
  
      icy-genre       : test
  
      icy-name        : Test
  
      icy-pub         : 1
  
      StreamTitle     : silence
  
    Duration: N/A, start: 0.000000, bitrate: 128 kb/s
  
      Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  
    Stream #1:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x563bdde386a0] using SAR=1/1
  
  [libx264 @ 0x563bdde386a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x563bdde386a0] profile Constrained Baseline, level 4.0
  
  [libx264 @ 0x563bdde386a0] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=18 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=1 scenecut=0 intra_refresh=0 rc_lookahead=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=2048 vbv_bufsize=2048 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=0
  
  Output #0, flv, to 'rtmp://a.rtmp.youtube.com/live2/k478-1xpz-v2de-5e79':
  
    Metadata:
  
      encoder         : Lavf57.83.100
  
      Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 1 fps, 1k tbn, 1 tbc
  
      Metadata:
  
        encoder         : Lavc57.107.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 2048000/0/0 buffer size: 2048000 vbv_delay: -1
  
      Stream #0:1: Audio: mp3 ([2][0][0][0] / 0x0002), 44100 Hz, stereo, s16p, 128 kb/s

  FIFO

  Input #0, image2, from '/var/users/youtube_stream/DJ-philadelphia_jO46wsH.jpg':
  
    Duration: 00:00:01.00, start: 0.000000, bitrate: 597 kb/s
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 1 fps, 1 tbr, 1 tbn, 1 tbc
  
  Input #1, mp3, from 'http://127.0.0.1:4700/radio':
  
    Metadata:
  
      icy-br          : 128
  
      icy-description : test
  
      icy-genre       : test
  
      icy-name        : Test
  
      icy-pub         : 1
  
      StreamTitle     : silence
  
    Duration: N/A, start: 0.000000, bitrate: 128 kb/s
  
      Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  
    Stream #1:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x560fb2209ae0] using SAR=1/1
  
  [libx264 @ 0x560fb2209ae0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x560fb2209ae0] profile Constrained Baseline, level 4.0
  
  Output #0, fifo, to 'rtmp://a.rtmp.youtube.com/live2/k478-1xpz-v2de-5e79':
  
    Metadata:
  
      encoder         : Lavf57.83.100
  
      Stream #0:0: Video: h264 (libx264), yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 1 fps, 1 tbn, 1 tbc
  
      Metadata:
  
        encoder         : Lavc57.107.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 2048000/0/0 buffer size: 2048000 vbv_delay: -1
  
      Stream #0:1: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s

  you can see the input streams, output, mapping - all fine except one line that is missing with fifo format :

  [libx264 @ 0x563bdde386a0] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html ...

  Seems like video codec is not completely initialized and does not start with when using fifo format.

  So my questions are :

  1. is there a way to create a reliable stream with ffmpeg w/o using
     fifo format ?
  2. if fifo format is mandatory in this case, what’s wrong with my
     video codec ?

• Unable to encode single frame h264 (.mp4) video with FFmpeg. No video stream present

  5 mai 2015, par Maxito

  I have achieved this with ffmpeg command line tool using the command. The folder had only one image.

  ffmpeg -r 24 -i image%03d.bmp -c:v libx264 -pix_fmt yuv420p
  oneframex.mp4

  I would like to do the same with C++. If I encode a video of three or more frames, video encodes correctly, but the result of encoding a one or two frames video never has a video stream, as reported by ffprobe and some media players.

  Comparing with ffprobe, my video (the one with three or more frames) and the one generated by the command tool show almost the same information. Only bitrate and encoder version are different.

  I have tried adding force_key_frames to 1, tried with many encoding options and have be unsuccessful.

  The application output gives me this information :

  [libx264 @ 20d1b840] using cpu capabilities : MMX2 SSE2Fast SSSE3
  SSE4.2 AVX

  [libx264 @ 20d1b840] profile High, level 4.0

  [libx264 @ 20d1b840] 264 - core 142 r2431 ac76440 - H.264/MPEG-4 AVC
  codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html -
  options : cabac=0 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=dia subme=8
  psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=0 trellis=0
  8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2
  threads=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1
  interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0
  keyint=1 keyint_min=1 scenecut=0 intra_refresh=0 rc=crf mbtree=0
  crf=10.0 qcomp=0.60 qpmin=0 qpmax=25 qpstep=4 ip_ratio=1.40 aq=1:1.00

  These are my main parameters :

  pCodecCtx->codec_id = AV_CODEC_ID_H264;
  
  pCodecCtx->pix_fmt= AV_PIX_FMT_YUV420P; 
  
  pCodecCtx->gop_size = 1;
  
  pCodecCtx->bit_rate = 400000;
  
  pCodecCtx->me_range = 16;
  
  pCodecCtx->max_qdiff = 4;
  
  pCodecCtx->qcompress = 0.6;
  
  pCodecCtx->qmin = 0;
  
  pCodecCtx->qmax = 25;
  
  pCodecCtx->time_base.den = 24;
  
  pCodecCtx->time_base.num = 1;
  
  
  
  AVDictionary *param = 0;
  
              av_dict_set(&param, "preset", "slow", 0);
  
              av_dict_set(&param, "profile", "high", 0);
  
              av_dict_set(&param, "crf", "10", 0); //this gave me quality
  
              av_dict_set(&param, "force_key_frames", "1", 0);

  In my encoding I just added

  ppicture->pts = pCodecCtx->frame_number

  to avoid non-strictly-monotonic PTS message. And tried the methods from this question in case it had something to do.

  I’m sure I must be missing some important parameter to be able to create such a small video. I will take any suggestion.