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• FFmpeg crashing on drawtext filter (ffmpeg-python)

  31 août 2023, par DeadSec

  Hey guys so im trying to use ffmpeg-python to add text to a video but its crashing at

  


  [Parsed_drawtext_0 @ 0000012ea115ee80] Setting 'text' to value 'hi'

  


  and I'm not sure what I can do to fix this problem. I tried pure FFmpeg command-line style and still the same issue where it gets stuck at Setting text to value and it simply outputs a 0byte mp4 after crashing.

  


  My code :

  


  os.environ['FONTCONFIG_FILE'] = r'C:\Users\NOP\NOP\NOP\NOP\binaries\fonts\fonts.conf'
    os.environ['FONTCONFIG_PATH'] = r'C:\Users\NOP\NOP\NOP\NOP\binaries\fonts'
    os.environ['FC_CONFIG_DIR'] = r'C:\Users\NOP\NOP\NOP\NOP\binaries\fonts'
    in_ = ffmpeg.input(output_video_logo)
    in_ = in_.drawtext(text='hi')
    ffmpeg.output(in_, output_video).global_args('-loglevel', 'debug').run(cmd=FFMPEG_PATH)


  


  Font config file :

  


  &lt;?xml version="1.0"?>&#xA;&#xA;&#xA;<fontconfig>&#xA;&#xA;&#xA;&#xA;&#xA;&#xA;    <dir>WINDOWSFONTDIR</dir>&#xA;    <dir>~/fonts</dir>&#xA;    <dir prefix="cwd">.</dir>&#xA;    <dir>~/.fonts</dir>&#xA;&#xA;&#xA;    <match target="pattern">&#xA;        <test qual="any">&#xA;            <string>mono</string>&#xA;        </test>&#xA;        <edit mode="assign">&#xA;            <string>monospace</string>&#xA;        </edit>&#xA;    </match>&#xA;&#xA;&#xA;    <match target="pattern">&#xA;        <test qual="any">&#xA;            <string>sans serif</string>&#xA;        </test>&#xA;        <edit mode="assign">&#xA;            <string>sans-serif</string>&#xA;        </edit>&#xA;    </match>&#xA;&#xA;&#xA;    <match target="pattern">&#xA;        <test qual="any">&#xA;            <string>sans</string>&#xA;        </test>&#xA;        <edit mode="assign">&#xA;            <string>sans-serif</string>&#xA;        </edit>&#xA;    </match>&#xA;&#xA;&#xA;    <include>conf.d</include>&#xA;&#xA;&#xA;&#xA;    <cachedir>WINDOWSTEMPDIR_FONTCONFIG_CACHE</cachedir>&#xA;    <cachedir>~/.fontconfig</cachedir>&#xA;&#xA;    <config>&#xA;&#xA;&#xA;        <rescan>&#xA;            <int>30</int>&#xA;        </rescan>&#xA;    </config>&#xA;&#xA;</fontconfig>&#xA;

  


  Is this a issue with any of my fontconfig or script ? I'm really lost on fixing this.

  


  As requested by Rotem tried adding new input to drawtext and this was the output before crashing with no error message :
Successfully opened the file.

  


  [Parsed_drawtext_0 @ 00000171a2f0f900] Setting 'box' to value '1'
[Parsed_drawtext_0 @ 00000171a2f0f900] Setting 'boxcolor' to value 'yellow'
[Parsed_drawtext_0 @ 00000171a2f0f900] Setting 'fontcolor' to value 'blue'
[Parsed_drawtext_0 @ 00000171a2f0f900] Setting 'fontsize' to value '72'
[Parsed_drawtext_0 @ 00000171a2f0f900] Setting 'text' to value 'hi'
[Parsed_drawtext_0 @ 00000171a2f0f900] Setting 'x' to value '10'
[Parsed_drawtext_0 @ 00000171a2f0f900] Setting 'y' to value '10'


  


  Full log :
https://pastebin.com/E6sHvwUz

  


• using clang compile ffmpeg with too much warning on osx

  12 juin 2014, par arachide

  I use clang to compile ffmpeg, It reports too much warn

  ./libavutil/arm/intmath.h:102:40: warning: value size does not match register size specified by the constraint and modifier
  
        [-Wasm-operand-widths]
  
  ./libavutil/arm/intmath.h:102:40: warning: value size does not match register size specified by the constraint and modifier
  
        [-Wasm-operand-widths]

  and finally stop with error

  libavcodec/arm/mlpdsp_armv5te.S:5180:9: error: unknown directive
  
          .hword (75f - 0b) / 2
  
          ^
  
  libavcodec/arm/mlpdsp_armv5te.S:5182:9: error: unknown directive
  
          .hword (76f - 0b) / 2
  
          ^
  
  libavcodec/arm/mlpdsp_armv5te.S:5184:9: error: unknown directive
  
          .hword (77f - 0b) / 2
  
          ^
  
  libavcodec/arm/mlpdsp_armv5te.S:5186:9: error: unknown directive
  
          .hword (78f - 0b) / 2
  
          ^
  
  libavcodec/arm/mlpdsp_armv5te.S:5648:9: error: unknown directive

  Is there anyone met the same problem ?

• Fast green screen video processing on android device

  17 mars 2015, par Si-N

  I have written an app in iOS that takes two video sources, one with moving character on a green screen and any other video. The program then uses the GPUImage framework to add a chroma key shader via OpenGL ES 2 and then merges each frame (so the bottom frame now shows where the green pixels are) and outputs to a new video file. This happens very quickly, faster than real time.

  I have now been tasked with porting the app to Android. I thought it would be fairly straightforward. After doing some research I think I am wrong. There is an Android port of GPUImage but it does not handle video at the moment. I have done some research and come up with a very basic idea.

  I was wondering if you think this approach is feasible :

  Convert one video file to match resolution and type of other video using ffmpeg or JavaCV wrappers.

  Read frame by frame of each video using ffmpeg as MediaMetadataRetriever is very slow and convert into some RGB format. Use shader to apply chroma key effect so both frames are merged.

  Use ffmpeg to output result to a new file.

  This sounds slow, but if it sounds feasible I will try it out. I am not at all sure about making sure the 2 video resolutions / bitrate etc match. One video will be fixed at 1280 * 720 and the other video source will come from the camera on the device so will be variable. Also I think ffmpeg means using NDK which is a whole world of pain I wanted to avoid.

  I have a headache thinking about it. Any advice would be greatly appreciated.