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• swscale/graph : add new high-level scaler dispatch mechanism

  10 octobre 2024, par Niklas Haas

  swscale/graph : add new high-level scaler dispatch mechanism
  This interface has been designed from the ground up to serve as a new
  
  framework for dispatching various scaling operations at a high level. This
  
  will eventually replace the old ad-hoc system of using cascaded contexts,
  
  as well as allowing us to plug in more dynamic scaling passes requiring
  
  intermediate steps, such as colorspace conversions, etc.
  The starter implementation merely piggybacks off the existing sws_init() and
  
  sws_scale(), functions, though it does bring the immediate improvement of
  
  splitting up cascaded functions and pre/post conversion functions into
  
  separate filter passes, which allows them to e.g. be executed in parallel
  
  even when the main scaler is required to be single threaded. Additionally,
  
  a dedicated (multi-threaded) noop memcpy pass substantially improves
  
  throughput of that fast path.
  Follow-up commits will eventually expand this to move all of the scaling
  
  decision logic into the graph init function, and also eliminate some of the
  
  current special cases.
  Sponsored-by : Sovereign Tech Fund
  
  Signed-off-by : Niklas Haas <git@haasn.dev>
  

  • [DH] libswscale/Makefile
  • [DH] libswscale/graph.c
  • [DH] libswscale/graph.h

• Concatenate m4s vimeo files

  16 novembre 2024, par Veverica10

  when downloading a vimeo video my downloaded always stopped at 99%. I was left with two collections of m4s files ; one for video and one for audio stream.

  


  I tried all possible solutions an none worked for me. Renaming the extension to mp4 did not work, concatination with ffmpeg also did not work. I realised that video stream is created by an init.mp4 file followed by other segments one by one. The video player gets the information about the stream quality in a separate file, usually in text format. It then use the init.m4s file with video headers as a started and glues the segments to it in a proper order one by one. The same procedure applies to audio stream as well.

  


  I found this solution using developer tools of the browser, hexeditor and ffmpeg :

  


  

  • open the page with a video and open developer tools (CTRL-SHIFT-C in firefox)

  


  • press play in video player and monitor network traffic in developer tools.

  


  • a found a json file with information and save it to disk

  


  


  The file had all the information about streams. There were descriptions for five video streams and three audio streams. Stream for a video 1280x720 looked like this :

  


      {
      "id": "b522db58",
      "base_url": "video/",
      "format": "dash",
      "mime_type": "video/mp4",
      "codecs": "avc1.640020",
      "bitrate": 2895000,
      "avg_bitrate": 1068000,
      "duration": 6787.88,
      "framerate": 25,
      "width": 1280,
      "height": 720,
      "max_segment_duration": 7,
      "init_segment": "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",
      "index_segment": "b522db58.mp4?r=dXMtd2VzdDE%3D&range=831-14434",
      "segments": [
        {
          "start": 0,
          "end": 6.08,
          "url": "b522db58.mp4?r=dXMtd2VzdDE%3D&range=14435-328375",
          "size": 313940
        },
        {


  


  

  • create a file video_start.mp4 with a value of init_segmet and decode64 it with https://www.base64decode.org/
. This is our init.m4s starter.

  


  • use hex editor and concatenade video_start.mp4 with all other .m4s files in the right order. (Tools -> File tools -> concatenate). Save as video.mp4

  


  


  You can identify the right segments by looking a their size

  


  

  • repeat the same procedure for audio stream :

  


  


  "audio": [
    {
      "id": "d27f1f72",
      "base_url": "audio/",
      "format": "dash",
      "mime_type": "audio/mp4",
      "codecs": "mp4a.40.2",
      "bitrate": 191000,
      "avg_bitrate": 191000,
      "duration": 6787.84,
      "channels": 2,
      "sample_rate": 48000,
      "max_segment_duration": 8,
      "init_segment": "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",
      "index_segment": "d27f1f72.mp4?r=dXM%3D&range=710-14325",
      "segments": [
        {
          "start": 0,
          "end": 5.994666666666666,
          "url": "d27f1f72.mp4?r=dXM%3D&range=14326-157787",
          "size": 143461
        },


  


  


  • create a file audio_start.mp4 with a value of init_segmet and decode64 it with https://www.base64decode.org/
.

    


  


  • Concatenade audio_start.mp4 with all other .m4s files in the right order. (Tools -> File tools -> concatenate). Save as audio.mp4

    


  


  • use ffmpeg and join both streams

    


  


  


  ffmpeg -i video.mp4 -i audio.mp4 -c copy output.mp4


  


  

  • done

  


  


  


• FFMPEG and MSA1 Codec Issues when Converting WMV to MP4 Video

  30 décembre 2023, par user136819

  I have a WMV video file (around 60 MB size, 01:23:00 length) and I'm running a Windows Server 2016 64-bit machine for testing.
  
As far as I know, this video file was recorded using Microsoft Live Meeting 2007 back in April 2010 and there is also an associated audio file (which I'm able to play).

  


  I tried to play the video file on my machine using VLC player (latest update), however, I always see this weird MSA1 codec error :

  


  

  


  So I tried to resolve this problem by downloading and installing the Combined-Community-Codec-Pack-64bit-2015-10-18, and using its MPC-HC 64-bit player to play the video...
I still couldn't get it to play ! Here are the logs shown by the MPC player :

  


  

  


  WM ASF Reader::Raw Video 0

Media Type 0:
--------------------------
Video: MSA1 1440x900 5fps 164kbps

AM_MEDIA_TYPE: 
majortype: MEDIATYPE_Video {73646976-0000-0010-8000-00AA00389B71}
subtype: Unknown GUID Name {3141534D-0000-0010-8000-00AA00389B71}
formattype: FORMAT_VideoInfo {05589F80-C356-11CE-BF01-00AA0055595A}
bFixedSizeSamples: 0
bTemporalCompression: 1
lSampleSize: 0
cbFormat: 88

VIDEOINFOHEADER:
rcSource: (0,0)-(1440,900)
rcTarget: (0,0)-(1440,900)
dwBitRate: 164794
dwBitErrorRate: 0
AvgTimePerFrame: 2000000

BITMAPINFOHEADER:
biSize: 40
biWidth: 1440
biHeight: 900
biPlanes: 1
biBitCount: 16
biCompression: MSA1
biSizeImage: 66101
biXPelsPerMeter: 0
biYPelsPerMeter: 0
biClrUsed: 0
biClrImportant: 0

pbFormat:
0000: 00 00 00 00 00 00 00 00 a0 05 00 00 84 03 00 00 ........ ...„...
0010: 00 00 00 00 00 00 00 00 a0 05 00 00 84 03 00 00 ........ ...„...
0020: ba 83 02 00 00 00 00 00 80 84 1e 00 00 00 00 00 ºƒ......€„......
0030: 28 00 00 00 a0 05 00 00 84 03 00 00 01 00 10 00 (... ...„.......
0040: 4d 53 41 31 35 02 01 00 00 00 00 00 00 00 00 00 MSA15...........
0050: 00 00 00 00 00 00 00 00                         ........


  


  Since that didn't work, I tried installing the Microsoft MPEG-4 V1/2/3 VKI Codec for ASF files and still couldn't get the players to play the video and saw the same errors as above !

  


  As a final attempt, I tried to convert this video to MP4 format using FFMPEG (version from 2020). Even this failed. Here are the logs :

  


  D:\ffmpeg-20200403-52523b6-win64-static\bin>ffmpeg.exe -i input-video.wmv -c:v copy -c:a aac -q:a 100 output.mp4
ffmpeg version git-2020-04-03-52523b6 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200328
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --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-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 42.102 / 56. 42.102
  libavcodec     58. 77.101 / 58. 77.101
  libavformat    58. 42.100 / 58. 42.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 77.101 /  7. 77.101
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
[msa1 @ 000002505bb847c0] Image dimensions should be a multiple of 16.
[asf @ 000002505bb4b600] Failed to open codec in avformat_find_stream_info
[msa1 @ 000002505bb847c0] Image dimensions should be a multiple of 16.
Input #0, asf, from 'input-video.wmv':
  Metadata:
    WMFSDKNeeded    : 0.0.0.0000
    WMFSDKVersion   : 10.00.00.4072
    IsVBR           : 0
  Duration: 01:22:49.28, start: 0.000000, bitrate: 96 kb/s
    Stream #0:0(ger): Video: msa1 (MSA1 / 0x3141534D), none, 1440x900, 164 kb/s, 5 tbr, 1k tbn, 1k tbc
[mp4 @ 000002505bb4ce40] Could not find tag for codec msa1 in stream #0, codec not currently supported in container
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

D:\ffmpeg-20200403-52523b6-win64-static\bin>


  


  I wish to know, is there any other way I can convert this video to a more modern format so that I can play it on a modern machine and modern video player ?
  
What other codecs am I missing here ? (if so, where can I get them ?)
  
FYI, as mentioned earlier at the top, I'm only able to play the associated audio file...

  


  I'm fairly new to all this stuff, so any help is appreciated.

  


  Thanks in advance ! :)