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• FFmpeg stops encoding when log file reaches 388 kB

  30 janvier 2018, par Rune Aspvik

  I’m using ffmpeg in a node application with this command :

  ffmpeg -seekable 0 -i http://127.0.0.1:8100/Mjpeg/1?authToken=xxx -video_size 1280x720 -r 30 -pix_fmt yuv420p -y D:\Video\pflyers\test.mp4

  The encoding would stop after 28:53 every time. After some reading I figured I had to spawn the child instead of exec because of the large sterr output.

  Before doing that I wanted to see if that was in fact the issue so I tried doing :

  -nostats -hide_banner -loglevel panic

  to avoid the large output to sterr. FFmpeg still stopped after 28:53. Further I tried to write the sterr to log.txt instead of using the above code. I did so adding this to the end :

  2> log.txt

  Still it would stop at 28:53.

  Finally I tried running the command in cmd.exe resulting in the encoding stopping at 29:14.

  What I realized comparing the outputs from ffmpeg run from node and run from cmd.exe was that the encoding stopped when the log.txt reached 388kB.

  How can I fix this ?

  Here’s the full output :

  C:\Users\VossVind>ffmpeg -seekable 0 -i http://127.0.0.1:8100/Mjpeg/1?authToken=xxx -video_size 1280x720 -r 30 -pix_fmt yuv420p -y D:\Video\pflyers\test.mp4
  
  ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, mpjpeg, from 'http://127.0.0.1:8100/Mjpeg/1?authToken=xxx':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1280x720 [SAR 96:96 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0000019639b27fc0] deprecated pixel format used, make sure you did set range correctly
  
  [libx264 @ 0000019639944040] using SAR=1/1
  
  [libx264 @ 0000019639944040] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 0000019639944040] profile High, level 3.1
  
  [libx264 @ 0000019639944040] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=18 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'D:\Video\pflyers\test.mp4':
  
    Metadata:
  
      encoder         : Lavf57.83.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 30 fps, 15360 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.107.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  More than 1000 frames duplicated  114432kB time=00:03:17.80 bitrate=4739.3kbits/s dup=1000 drop=0 speed=0.95x
  
  frame=52544 fps= 29 q=-1.0 Lsize= 1050136kB time=00:29:11.36 bitrate=4912.0kbits/s dup=8757 drop=0 speed=0.972x
  
  video:1049508kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.059803%
  
  [libx264 @ 0000019639944040] frame I:261   Avg QP:20.59  size: 51862
  
  [libx264 @ 0000019639944040] frame P:15400 Avg QP:23.72  size: 33007
  
  [libx264 @ 0000019639944040] frame B:36883 Avg QP:24.55  size: 14989
  
  [libx264 @ 0000019639944040] consecutive B-frames:  0.9% 15.8%  2.5% 80.8%
  
  [libx264 @ 0000019639944040] mb I  I16..4: 17.1% 82.1%  0.8%
  
  [libx264 @ 0000019639944040] mb P  I16..4:  4.3% 48.4%  0.2%  P16..4: 12.3%  7.5%  4.8%  0.0%  0.0%    skip:22.5%
  
  [libx264 @ 0000019639944040] mb B  I16..4:  2.7% 15.6%  0.0%  B16..8: 22.3%  7.0%  1.8%  direct: 3.8%  skip:46.8%  L0:52.3% L1:34.0% BI:13.8%
  
  [libx264 @ 0000019639944040] 8x8 transform intra:88.6% inter:92.9%
  
  [libx264 @ 0000019639944040] coded y,uvDC,uvAC intra: 59.4% 33.6% 2.6% inter: 19.3% 10.9% 0.6%
  
  [libx264 @ 0000019639944040] i16 v,h,dc,p: 57% 30% 12%  1%
  
  [libx264 @ 0000019639944040] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 18% 45%  2%  1%  1%  2%  2%  3%
  
  [libx264 @ 0000019639944040] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 52% 24% 12%  2%  2%  2%  2%  2%  2%
  
  [libx264 @ 0000019639944040] i8c dc,h,v,p: 63% 17% 20%  1%
  
  [libx264 @ 0000019639944040] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0000019639944040] ref P L0: 43.8%  7.5% 29.1% 19.6%
  
  [libx264 @ 0000019639944040] ref B L0: 71.8% 21.2%  7.0%
  
  [libx264 @ 0000019639944040] ref B L1: 93.9%  6.1%
  
  [libx264 @ 0000019639944040] kb/s:4908.78

• How to solve file path error while using ffprobe to find length of video file in python ?

  4 février 2018, par Mitchell Faas

  So, I’m trying to find the length of a video file by the methods discussed here : How to get the duration of a video in Python ?, Using ffmpeg to obtain video durations in python. But in doing so I run in to a problem which I haven’t been able to solve : I get

  FileNotFoundError:[WinError 2] The system cannot find the file specified

  after trying a bunch of troubleshooting steps I’ve started running in IPython and in cmd seperately to see where things might break down. Using a stripped down version of this code in IPython gives me

  In [11]: subprocess.Popen([ffmpeg_path+'ffprobe'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  
  Out[11]: 

  which seems to be fine, as is CMD at this point. So to adding slight complexity :

  In [17]: subprocess.Popen([ffmpeg_path+'ffprobe -i "F:/tst.mp4"'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  
  ---------------------------------------------------------------------------
  
  FileNotFoundError                         Traceback (most recent call last)
  
   in <module>()
  
  ----> 1 subprocess.Popen([ffmpeg_path+'ffprobe -i "F:/tst.mp4"'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  
  
  
  C:\Python\Anaconda3\lib\subprocess.py in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags, restore_signals, start_new_session, pass_fds, encoding, errors)
  
      705                                 c2pread, c2pwrite,
  
      706                                 errread, errwrite,
  
  --> 707                                 restore_signals, start_new_session)
  
      708         except:
  
      709             # Cleanup if the child failed starting.
  
  
  
  C:\Python\Anaconda3\lib\subprocess.py in _execute_child(self, args, executable, preexec_fn, close_fds, pass_fds, cwd, env, startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite, unused_restore_signals, unused_start_new_session)
  
      988                                          env,
  
      989                                          cwd,
  
  --> 990                                          startupinfo)
  
      991             finally:
  
      992                 # Child is launched. Close the parent's copy of those pipe
  
  
  
  FileNotFoundError: [WinError 2] The system cannot find the file specified
  
  </module>

  This crashes IPython. Running the very same command ffprobe -i "F:/tst.mp4" in CMD works like a charm.

  Here’s what I tried : Changing / to \ and \ , adding and removing quotes around the file path, changing the path to C :\tst.mp4.

  Running the command os.system(ffmpeg_path+'ffprobe -i "F:/tst.mp4") does work.

  What could possibly be going wrong here ?

• avcodec : v4l2_m2m : context : fix raising warning on POLLERR

  9 janvier 2018, par Jorge Ramirez-Ortiz

  avcodec : v4l2_m2m : context : fix raising warning on POLLERR
  During the initialization stage, the codec attempts to get free
  
  buffers from the driver before any have been queued (this is to keep
  
  the code simple and generic)
  When the kernel driver detects this situation, it returns POLLERR in
  
  revents and ffmpeg therefore raises a warning.
  This commit disables the warning since no buffers were queued to the
  
  driver yet.
  Signed-off-by : Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
  

  • [DH] libavcodec/v4l2_context.c