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• youtube-dl got a 3gp file, apparently it doesn't contain any video streams

  27 juillet 2018, par Albertinio

  I tried downloading a video with youtube-dl with 3gp format. When I try to play it on VLC or any other application it doesn’t play. This is the output I get when trying to download it again.

  youtube-dl https://youtu.be/lVFq__mrmlQ -f worst -v  
  
  [debug] System config: []  
  
  [debug] User config: []  
  
  [debug] Custom config: []  
  
  [debug] Command-line args: ['https://youtu.be/lVFq__mrmlQ', '-f', 'worst', '-v']  
  
  [debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8  
  
  [debug] youtube-dl version 2018.03.14  
  
  [debug] Python version 3.6.5 (CPython) - Linux-4.15.0-29-generic-x86_64-with-Ubuntu-18.04-bionic  
  
  [debug] exe versions: ffmpeg 3.4.2-2, ffprobe 3.4.2-2, phantomjs 2.1.1, rtmpdump 2.4  
  
  [debug] Proxy map: {}  
  
  [youtube] lVFq__mrmlQ: Downloading webpage  
  
  [youtube] lVFq__mrmlQ: Downloading video info webpage  
  
  [youtube] lVFq__mrmlQ: Extracting video information  
  
  [debug] Invoking downloader on 'https://r4---sn-h5q7dnee.googlevideo.com/videoplayback?signature=5432A7990BB3336616E21753F1D53171D09CBC31.B98E84CF0C51F39C613F53311128CD9E7A3872EA&c=WEB&lmt=1514133618343257&key=yt6&itag=17&fvip=3&mn=sn-h5q7dnee%2Csn-h5q7knes&mm=31%2C29&pl=24&mime=video%2F3gpp&id=o-AKWLZ7MpY1ip3PlxZJ7vXBY-jDqbVpUeI_Bls_o_g-GV&ipbits=0&requiressl=yes&ip=90.174.4.0&gir=yes&mt=1532653244&ms=au%2Crdu&dur=18470.684&initcwndbps=1011250&ei=S29aW5SjH4bIVseNkfgE&expire=1532674987&mv=m&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&clen=195336027&source=youtube&ratebypass=yes'  
  
  [download] Heroes of Might and Magic III - No Might 1v7 FFA (200%)-lVFq__mrmlQ.3gp has already been downloaded  
  
  [download] 100% of 186.29MiB  

  I tried converting it with ffmpeg, but I get the following message :

  ffmpeg -i  Heroes\ of\ Might\ and\ Magic\ III\ -\ No\ Might\ 1v7\ FFA\ \(200%\)-lVFq__mrmlQ.3gp Heroes\ of\ Might\ and\ Magic\ III\ -\ No\ Might\ 1v7\ FFA\ \(200%\)-lVFq__mrmlQ.mp4
  
  ffmpeg version 3.4.2-2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7 (Ubuntu 7.3.0-16ubuntu2)
  
    configuration: --prefix=/usr --extra-version=2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    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
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e75c728c0] Could not find codec parameters for stream 0 (Video: mpeg4 (mp4v / 0x7634706D), none, 221 kb/s): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Heroes of Might and Magic III - No Might 1v7 FFA (200%)-lVFq__mrmlQ.3gp':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2017-12-24T16:43:17.000000Z
  
    Duration: 05:07:50.68, bitrate: 84 kb/s
  
      Stream #0:0(und): Video: mpeg4 (mp4v / 0x7634706D), none, 221 kb/s, 30 fps, 30 tbr, 15360 tbn, 15360 tbc (default)
  
      Metadata:
  
        creation_time   : 2017-12-24T16:43:17.000000Z
  
        handler_name    : IsoMedia File Produced by Google, 5-11-2011
  
  Output #0, mp4, to 'Heroes of Might and Magic III - No Might 1v7 FFA (200%)-lVFq__mrmlQ.mp4':
  
  Output file #0 does not contain any stream

  With this information, I don’t know how to proceed. I already tried ffmpeg with the max analyzeduration and probesize and it still doesn’t work. Any ideas ?

• ffmpeg - conditional blur of area based on colour

  23 mai 2021, par Silentfury

  Is it somehow possible in FFmpeg to blur areas of a video based on their colour value ?

  


  For example, all pixels of a video considered "green" should get a box blur

  


  Alternatively, I could also think of blurring the entire video but the blurring strength of each pixel/area should depend on the amount of "green"

  


  Is there some clever filter magic for that ?

  


• lavc/vc1dsp : R-V V vc1_unescape_buffer

  12 mai 2024, par Rémi Denis-Courmont

  lavc/vc1dsp : R-V V vc1_unescape_buffer
  Notes :
  
   The loop is biased toward no unescaped bytes as that should be most common.
  
   The input byte array is slid rather than the (8 times smaller) bit-mask,
  
    as RISC-V V does not provide a bit-mask (or bit-wise) slide instruction.
  
   There are two comparisons with 0 per iteration, for the same reason.
  
   In case of match, bytes are copied until the first match, and the loop is
  
    restarted after the escape byte. Vector compression (vcompress.vm) could
  
    discard all escape bytes but that is slower if escape bytes are rare.
  Further optimisations should be possible, e.g. :
  
   processing 2 bytes fewer per iteration to get rid of a 2 slides,
  
   taking a short cut if the input vector contains less than 2 zeroes.
  
  But this is a good starting point :
  T-Head C908 :
  
  vc1dsp.vc1_unescape_buffer_c :      12749.5
  
  vc1dsp.vc1_unescape_buffer_rvv_i32 : 6009.0
  SpacemiT X60 :
  
  vc1dsp.vc1_unescape_buffer_c :      11038.0
  
  vc1dsp.vc1_unescape_buffer_rvv_i32 : 2061.0
  

  • [DH] libavcodec/riscv/vc1dsp_init.c
  • [DH] libavcodec/riscv/vc1dsp_rvv.S