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FFmpeg fails to draw text
6 avril 2024, par Edoardo BalducciI've rarely used ffmpeg before, so, sorry If the question is too dumb.
I have a problem adding a text layer to a video frame using ffmpeg.


This is my current code :


import subprocess
from PyQt5.QtGui import QPixmap, QImage
from PyQt5.QtWidgets import QLabel

class VideoThumbnailLabel(QLabel):
 def __init__(self, file_path, *args, **kwargs):
 super().__init__(*args, **kwargs)
 self.video = video
 video_duration = self.get_video_duration(file_path)
 thumbnail_path = self.get_thumbnail(file_path, video_duration)
 if thumbnail_path:
 self.setPixmap(QPixmap(thumbnail_path).scaled(160, 90, Qt.KeepAspectRatio))
 self.setToolTip(f"{video.title}\n{video.description}")

 def get_video_duration(self, video_path):
 """Returns the duration of the video in seconds."""
 command = [
 'ffprobe', '-v', 'error', '-show_entries',
 'format=duration', '-of',
 'default=noprint_wrappers=1:nokey=1', video_path
 ]
 try:
 result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
 if result.returncode != 0:
 print(f"ffprobe error: {result.stderr}")
 return 0
 duration = float(result.stdout)
 return int(duration) # Returning duration as an integer for simplicity
 except Exception as e:
 print(f"Error getting video duration: {e}")
 return 0

 def get_thumbnail(self, video_path, duration):
 """Generates a thumbnail with the video duration overlaid."""
 output_path = "thumbnail.jpg" # Temporary thumbnail file
 duration_str = f"{duration // 3600:02d}:{(duration % 3600) // 60:02d}:{duration % 60:02d}"
 command = [
 'ffmpeg', '-i', video_path,
 '-ss', '00:00:01', # Time to take the screenshot
 '-frames:v', '1', # Number of frames to capture
 '-vf', f"drawtext=text='Duration: {duration_str}':x=10:y=10:fontsize=24:fontcolor=white",
 '-q:v', '2', # Output quality
 '-y', # Overwrite output files without asking
 output_path
 ]
 try:
 result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 if result.returncode != 0:
 print(f"ffmpeg error: {result.stderr}")
 return None
 return output_path
 except Exception as e:
 print(f"Error generating thumbnail with duration: {e}")
 return None



and it is used like this :


for i, video in enumerate(self.videos):
 video_widget = VideoThumbnailLabel(video.file)
 video_widget.mousePressEvent = lambda event, v=video: self.onThumbnailClick(
 v
 )
 self.layout.addWidget(video_widget, i // 3, i % 3)



I'm facing a problem where I am not able to get the thumbnail if I try to add the duration (I've tested it without the draw filter and worked fine)


I get this error (from the
result.returncode
) that I'm not able to comprehend :

ffmpeg error: b"ffmpeg version 6.1.1 Copyright (c) 2000-2023 the FFmpeg developers\n built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)\n configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.1.1_4 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenvino --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon\n libavutil 58. 29.100 / 58. 29.100\n libavcodec 60. 31.102 / 60. 31.102\n libavformat 60. 16.100 / 60. 16.100\n libavdevice 60. 3.100 / 60. 3.100\n libavfilter 9. 12.100 / 9. 12.100\n libswscale 7. 5.100 / 7. 5.100\n libswresample 4. 12.100 / 4. 12.100\n libpostproc 57. 3.100 / 57. 3.100\nInput #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/edoardo/Projects/work/test/BigBuckBunny.mp4':\n Metadata:\n major_brand : mp42\n minor_version : 0\n compatible_brands: isomavc1mp42\n creation_time : 2010-01-10T08:29:06.000000Z\n Duration: 00:09:56.47, start: 0.000000, bitrate: 2119 kb/s\n Stream #0:0[0x1](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)\n Metadata:\n creation_time : 2010-01-10T08:29:06.000000Z\n handler_name : (C) 2007 Google Inc. v08.13.2007.\n vendor_id : [0][0][0][0]\n Stream #0:1[0x2](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 1991 kb/s, 24 fps, 24 tbr, 24k tbn (default)\n Metadata:\n creation_time : 2010-01-10T08:29:06.000000Z\n handler_name : (C) 2007 Google Inc. v08.13.2007.\n vendor_id : [0][0][0][0]\n[Parsed_drawtext_0 @ 0x60000331cd10] Both text and text file provided. Please provide only one\n[AVFilterGraph @ 0x600002018000] Error initializing filters\n[vost#0:0/mjpeg @ 0x13ce0c7e0] Error initializing a simple filtergraph\nError opening output file thumbnail.jpg.\nError opening output files: Invalid argument\n"



I've installed both
ffmpeg
andffmprobe
in my machine :

┌(edoardomacbook-air)-[~/Projects/work/tests-scripts] 
└─ $ ffmpeg -version && ffprobe -version 2 ⚙ 
ffmpeg version 6.1.1 Copyright (c) 2000-2023 the FFmpeg developers
built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)
configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.1.1_4 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenvino --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
libavutil 58. 29.100 / 58. 29.100
libavcodec 60. 31.102 / 60. 31.102
libavformat 60. 16.100 / 60. 16.100
libavdevice 60. 3.100 / 60. 3.100
libavfilter 9. 12.100 / 9. 12.100
libswscale 7. 5.100 / 7. 5.100
libswresample 4. 12.100 / 4. 12.100
libpostproc 57. 3.100 / 57. 3.100
ffprobe version 6.1.1 Copyright (c) 2007-2023 the FFmpeg developers
built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)
configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.1.1_4 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenvino --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
libavutil 58. 29.100 / 58. 29.100
libavcodec 60. 31.102 / 60. 31.102
libavformat 60. 16.100 / 60. 16.100
libavdevice 60. 3.100 / 60. 3.100
libavfilter 9. 12.100 / 9. 12.100
libswscale 7. 5.100 / 7. 5.100
libswresample 4. 12.100 / 4. 12.100
libpostproc 57. 3.100 / 57. 3.100



Does anyone see the problem ?



P.S. : I know that I havent provided a minimal reproducible example, but since I don't know where the problem lies I didn't want to exclude anything


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