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[ThumbnailsConvertor] Support conversion to png and make it the default (#333)

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PNG, being a lossless format, should be a better default here compared to JPG since we won't be compressing to a lossy format and losing some of the original image data
PNG is also supported for embedding in all the formats similar to JPEG

Authored by: louie-github
This commit is contained in:
louie-github
2021-05-22 02:09:48 +08:00
committed by GitHub
parent 09f1580e2d
commit a927acb1ec
5 changed files with 25 additions and 16 deletions
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9
yt_dlp/postprocessor/embedthumbnail.py
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@@ -77,11 +77,14 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
original_thumbnail = thumbnail_filename = info['thumbnails'][-1]['filepath']
# Convert unsupported thumbnail formats to JPEG (see #25687, #25717)
# Convert unsupported thumbnail formats to PNG (see #25687, #25717)
# Original behavior was to convert to JPG, but since JPG is a lossy
# format, there will be some additional data loss.
# PNG, on the other hand, is lossless.
thumbnail_ext = os.path.splitext(thumbnail_filename)[1][1:]
if thumbnail_ext not in ('jpg', 'png'):
thumbnail_filename = convertor.convert_thumbnail(thumbnail_filename, 'jpg')
thumbnail_ext = 'jpg'
thumbnail_filename = convertor.convert_thumbnail(thumbnail_filename, 'png')
thumbnail_ext = 'png'
mtime = os.stat(encodeFilename(filename)).st_mtime