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• avutil/mathematics : speed up av_gcd by using Stein’s binary GCD algorithm

  11 octobre 2015, par Ganesh Ajjanagadde

  avutil/mathematics : speed up av_gcd by using Stein’s binary GCD algorithm
  This uses Stein’s binary GCD algorithm :
  
  https://en.wikipedia.org/wiki/Binary_GCD_algorithm
  
  to get a roughly 4x speedup over Euclidean GCD on standard architectures
  
  with a compiler intrinsic for ctzll, and a roughly 2x speedup otherwise.
  
  At the moment, the compiler intrinsic is used on GCC and Clang due to
  
  its easy availability.
  Quick note regarding overflow : yes, subtractions on int64_t can, but the
  
  llabs takes care of that. The llabs is also guaranteed to be safe, with
  
  no annoying INT64_MIN business since INT64_MIN being a power of 2, is
  
  shifted down before being sent to llabs.
  The binary GCD needs ff_ctzll, an extension of ff_ctz for long long (int64_t). On
  
  GCC, this is provided by a built-in. On Microsoft, there is a
  
  BitScanForward64 analog of BitScanForward that should work ; but I can’t confirm.
  
  Apparently it is not available on 32 bit builds ; so this may or may not
  
  work correctly. On Intel, per the documentation there is only an
  
  intrinsic for _bit_scan_forward and people have posted on forums
  
  regarding _bit_scan_forward64, but often their documentation is
  
  woeful. Again, I don’t have it, so I can’t test.
  As such, to be safe, for now only the GCC/Clang intrinsic is added, the rest
  
  use a compiled version based on the De-Bruijn method of Leiserson et al :
  
  http://supertech.csail.mit.edu/papers/debruijn.pdf.
  Tested with FATE, sample benchmark (x86-64, GCC 5.2.0, Haswell)
  
  with a START_TIMER and STOP_TIMER in libavutil/rationsl.c, followed by a
  
  make fate.
  aac-am00_88.err :
  
  builtin :
  
  714 decicycles in av_gcd,    4095 runs,      1 skips
  de-bruijn :
  
  1440 decicycles in av_gcd,    4096 runs,      0 skips
  previous :
  
  2889 decicycles in av_gcd,    4096 runs,      0 skips
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavutil/intmath.h
  • [DH] libavutil/mathematics.c

• RTSP stream to HLS Stream using FFMPEG, Getting Error with newer FFMPEG

  8 novembre 2017, par shaun

  I am trying to take an RTSP stream and convert it to an HLS sTream.

  If I use ffmpeg version N-76684-g1fe82ab
  This command Works just fine.

  c:\temp\ffmpeg.exe -i "rtsp://192.168.249.233:8554/Stream" -c:v copy -hls_time 3 -hls_wrap 10 "c:\inetpub\wwwroot\hls\streaming.m3u8"

  However, if I use a newer compiled version of FFMPEG ffmpeg version N-83779-gfe57bf7cd6
  using the same exact command as above I get the error :

  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument.

  What am I doing wrong ? I would like to use the newer FFMPEG, but it appears that something broke between them.....

  ---

  complete console output of N-83779

  C:\inetpub\wwwroot\hls>ffmpeg.exe -i "rtsp://192.168.249.233:8554/Stream" -c:v copy -hls_time 3 -hls_wrap 10 "c:\inetpub\wwwroot\hls\streaming.m3u8"
  
  ffmpeg version N-83779-gfe57bf7cd6 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.9.3 (GCC)
  
    configuration: --prefix=/usr/local/x86_64-w64-mingw32 --enable-gpl --enable-nonfree --enable-libx264 --enable-libfdk_aac --enable-static --enable-runtime-cpudetect --enable-w32th
  
  reads --disable-shared --disable-ffplay --disable-ffserver --arch=x86_64 --extra-cflags=-I/local/x86_64-w64-mingw32/include --extra-ldflags='-L/local/x86_64-w64-mingw32/lib -static
  
  '
  
    libavutil      55. 48.100 / 55. 48.100
  
    libavcodec     57. 82.102 / 57. 82.102
  
    libavformat    57. 66.103 / 57. 66.103
  
    libavdevice    57.  3.100 / 57.  3.100
  
    libavfilter     6. 74.100 /  6. 74.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  [udp @ 023e9d40] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
  
  [udp @ 039af180] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
  
  Invalid UE golomb code
  
  [h264 @ 023eaca0] log2_max_frame_num_minus4 out of range (0-12): -1094995529
  
  [rtsp @ 023e7220] Failed to open codec in avformat_find_stream_info
  
  Invalid UE golomb code
  
  [NULL @ 023eaca0] log2_max_frame_num_minus4 out of range (0-12): -1094995529
  
  [NULL @ 023eaca0] non-existing PPS 0 referenced
  
  Invalid UE golomb code
  
  [h264 @ 023eaca0] log2_max_frame_num_minus4 out of range (0-12): -1094995529
  
  [NULL @ 023eaca0] non-existing PPS 0 referenced
  
      Last message repeated 20 times
  
  [rtsp @ 023e7220] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  [rtsp @ 023e7220] Could not find codec parameters for stream 0 (Video: h264 (High), none(progressive)): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, rtsp, from 'rtsp://192.168.249.233:8554/Stream':
  
    Metadata:
  
      title           : Session streamed by Stream
  
      comment         : Stream
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: h264 (High), none(progressive), 90k tbr, 90k tbn, 180k tbc
  
  [hls @ 039d5140] dimensions not set
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
      Last message repeated 1 times

  ---

  Tried -analyzeduration 10M -probesize 10M did not help.

  ffmpeg -analyzeduration 10M -probesize 10M -i "rtsp://192.168.249.233:8554/Stream" -c:v copy -hls_time 3 -hls_wrap 10 "c:\inetpub\wwwroot\hls\streaming.m3u8"
  
  ffmpeg version N-83779-gfe57bf7cd6 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.9.3 (GCC)
  
    configuration: --prefix=/usr/local/x86_64-w64-mingw32 --enable-gpl --enable-nonfree --enable-libx264 --enable-libfdk_aac --enable-static --enable-runtime-cpudetect --enable-w32threads --disable-shared --disable-ffplay --disable-ffserver --arch=x86_64 --extra-cflags=-I/local/x86_64-w64-mingw32/include --extra-ldflags='-L/local/x86_64-w64-mingw32/lib -static'
  
    libavutil      55. 48.100 / 55. 48.100
  
    libavcodec     57. 82.102 / 57. 82.102
  
    libavformat    57. 66.103 / 57. 66.103
  
    libavdevice    57.  3.100 / 57.  3.100
  
    libavfilter     6. 74.100 /  6. 74.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  [udp @ 0238a140] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
  
  [udp @ 0421f1a0] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
  
  Invalid UE golomb code
  
  [h264 @ 0238af20] log2_max_frame_num_minus4 out of range (0-12): -1094995529
  
  [rtsp @ 02387960] Failed to open codec in avformat_find_stream_info
  
  Invalid UE golomb code
  
  [NULL @ 0238af20] log2_max_frame_num_minus4 out of range (0-12): -1094995529
  
  [NULL @ 0238af20] non-existing PPS 0 referenced
  
  Invalid UE golomb code
  
  [h264 @ 0238af20] log2_max_frame_num_minus4 out of range (0-12): -1094995529
  
  [NULL @ 0238af20] non-existing PPS 0 referenced
  
      Last message repeated 24 times
  
  [rtsp @ 02387960] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  [rtsp @ 02387960] Could not find codec parameters for stream 0 (Video: h264 (High), none(progressive)): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, rtsp, from 'rtsp://192.168.249.233:8554/FirstVuHD':
  
    Metadata:
  
      title           : Session streamed by Stream
  
      comment         : Stream
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: h264 (High), none(progressive), 90k tbr, 90k tbn, 180k tbc
  
  [hls @ 04edf8a0] dimensions not set
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
      Last message repeated 1 times

  ---

  Working older version of FFMPEG output

  c:/temp/ffmpeg -i "rtsp://192.168.249.233:8554/Stream" -c:v copy -hls_time 3 -hls_wrap 10 "c:\inetpub\wwwroot\hls\streaming.m3u8"
  
  ffmpeg version N-76684-g1fe82ab Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55.  6.100 / 55.  6.100
  
    libavcodec     57. 15.100 / 57. 15.100
  
    libavformat    57. 14.100 / 57. 14.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 15.100 /  6. 15.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  [h264 @ 0000000000506d20] log2_max_frame_num_minus4 out of range (0-12): -1
  
      Last message repeated 5 times
  
  [h264 @ 0000000000506d20] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0000000000506d20] decode_slice_header error
  
  [h264 @ 0000000000506d20] no frame!
  
  [h264 @ 0000000000506d20] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0000000000506d20] decode_slice_header error
  
  [h264 @ 0000000000506d20] no frame!
  
  [h264 @ 0000000000506d20] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0000000000506d20] decode_slice_header error
  
  [h264 @ 0000000000506d20] no frame!
  
  [h264 @ 0000000000506d20] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0000000000506d20] decode_slice_header error
  
  [h264 @ 0000000000506d20] no frame!
  
  [rtsp @ 0000000000503e60] max delay reached. need to consume packet
  
  [h264 @ 0000000000506d20] RTP: missed 75 packets
  
  [h264 @ 0000000000506d20] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0000000000506d20] decode_slice_header error
  
  [h264 @ 0000000000506d20] no frame!
  
  [rtsp @ 0000000000503e60] max delay reached. need to consume packet
  
  [h264 @ 0000000000506d20] RTP: missed 86 packets
  
  [h264 @ 0000000000506d20] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0000000000506d20] decode_slice_header error
  
  [h264 @ 0000000000506d20] no frame!
  
  [rtsp @ 0000000000503e60] max delay reached. need to consume packet
  
  [h264 @ 0000000000506d20] RTP: missed 57 packets
  
  [h264 @ 0000000000506d20] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0000000000506d20] decode_slice_header error
  
  [h264 @ 0000000000506d20] no frame!
  
  [rtsp @ 0000000000503e60] max delay reached. need to consume packet
  
  [h264 @ 0000000000506d20] RTP: missed 6 packets
  
  [h264 @ 0000000000506d20] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0000000000506d20] decode_slice_header error
  
  [h264 @ 0000000000506d20] no frame!
  
  [h264 @ 0000000000506d20] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0000000000506d20] decode_slice_header error
  
  [h264 @ 0000000000506d20] no frame!
  
  [h264 @ 0000000000506d20] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0000000000506d20] decode_slice_header error
  
  [h264 @ 0000000000506d20] no frame!
  
  [h264 @ 0000000000506d20] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0000000000506d20] decode_slice_header error
  
  [h264 @ 0000000000506d20] no frame!
  
  [h264 @ 0000000000506d20] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0000000000506d20] decode_slice_header error
  
  [h264 @ 0000000000506d20] no frame!
  
  [rtsp @ 0000000000503e60] max delay reached. need to consume packet
  
  [h264 @ 0000000000506d20] RTP: missed 1093 packets
  
  [rtsp @ 0000000000503e60] max delay reached. need to consume packet
  
  [h264 @ 0000000000506d20] RTP: missed 10 packets
  
  [rtsp @ 0000000000503e60] max delay reached. need to consume packet
  
  [h264 @ 0000000000506d20] RTP: missed 2 packets
  
  [rtsp @ 0000000000503e60] max delay reached. need to consume packet
  
  [h264 @ 0000000000506d20] RTP: missed 20 packets
  
  Input #0, rtsp, from 'rtsp://192.168.249.233:8554/Stream':
  
    Metadata:
  
      title           : Session streamed by Stream
  
      comment         : Stream
  
    Duration: N/A, start: 0.033367, bitrate: N/A
  
      Stream #0:0: Video: h264 (High), yuv420p, 1920x1080, 29.97 tbr, 90k tbn, 180k tbc
  
  Output #0, hls, to 'c:\inetpub\wwwroot\hls\streaming.m3u8':
  
    Metadata:
  
      title           : Session streamed by Stream
  
      comment         : Stream
  
      encoder         : Lavf57.14.100
  
      Stream #0:0: Video: h264, yuv420p, 1920x1080, q=2-31, 29.97 tbr, 90k tbn, 90k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [rtsp @ 0000000000503e60] max delay reached. need to consume packet
  
  [NULL @ 0000000000506d20] RTP: missed 211 packets
  
  frame=  398 fps= 71 q=-1.0 size=N/A time=00:00:16.68 bitrate=N/A

• Use ffmpeg Windows batch script on OS X

  3 novembre 2015, par andisk

  I got an ffmpeg batch script written by someone. The script takes all video clips of a specific folder, cuts off first and last frame, converts the clips to ProRes and saves them in a new folder. I got it running under Windows (just have to double-click the *.bat file and it does what it’s supposed to do).
  But now I need that same script running on a mac. I’ve installed ffmpeg over homebrew. Then I tried to make a Automator-Service, but with no success. Best thing would be if I could just right click on the folder with the videos, go to services and click on convert. I’m not really into coding and scripting, but the people who should use the script are happy when they find the power switch of the computer..
  Can anyone help me with this ?
  Cheers andisk

  Edit : Here’s the code

      `@echo off
  
  
  
  
  
      mkdir tmp
  
      mkdir converted
  
  
  
  
  
      set pathtofind=%~dp0
  
      echo Searching for files in %pathtofind%%1\
  
  
  
  
  
      setlocal enableextensions
  
      setlocal ENABLEDELAYEDEXPANSION
  
  
  
  
  
  
  
      for %%f in (%pathtofind%%1\*) do (
  
              echo Handling file %%f
  
              ffmpeg -y -loglevel quiet -i %%f tmp\%%d.png
  
              set count=0
  
              for %%x in (tmp\*) do set /a count +=1
  
              echo Deleting frames 1 and !count!
  
              del tmp\1.png
  
              del tmp\!count!.png
  
              echo Saving %%~nf.mov
  
              ffmpeg -y -loglevel verbose -f image2 -r 24 -i tmp\%%d.png -vcodec prores -profile:v 1 -r 24 converted\%%~nf.mov
  
              del /q tmp\*.*
  
  
  
              echo ---------------------------
  
      )
  
  
  
  
  
      rd tmp`