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Support anamorphic videos

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This commit is contained in:
Liam 2024-07-02 00:25:44 -04:00
parent d799c9d1bd
commit b8666b56a4
2 changed files with 17 additions and 16 deletions
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7
lib/philomena_media/gif_preview.ex
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@ -17,9 +17,7 @@ defmodule PhilomenaMedia.GifPreview do
Generate a GIF preview of the given video input with evenly-spaced sample points.
The input should have pre-computed duration `duration`. The `dimensions`
are a `{target_width, target_height}` tuple of the largest dimensions desired,
and the image will be resized to fit inside the box of those dimensions,
preserving aspect ratio.
are a `{target_width, target_height}` tuple.
Depending on the input file, this may take a long time to process.
@ -81,8 +79,7 @@ defmodule PhilomenaMedia.GifPreview do
"#{concat_input_pads} concat=n=#{num_images}, settb=1/#{target_framerate}, setpts=N [concat]"
scale_filter =
"[concat] scale=width=#{target_width}:height=#{target_height}:" <>
"force_original_aspect_ratio=decrease [scale]"
"[concat] scale=width=#{target_width}:height=#{target_height},setsar=1 [scale]"
split_filter = "[scale] split [s0][s1]"

26
lib/philomena_media/processors/webm.ex
View file

@ -87,7 +87,7 @@ defmodule PhilomenaMedia.Processors.Webm do
cond do
thumb_name in [:thumb, :thumb_small, :thumb_tiny] ->
gif = scale_gif(file, duration, target_dimensions)
gif = scale_gif(file, duration, dimensions, target_dimensions)
[
{:copy, webm, "#{thumb_name}.webm"},
@ -104,10 +104,9 @@ defmodule PhilomenaMedia.Processors.Webm do
end
defp scale_videos(file, dimensions, target_dimensions) do
{width, height} = box_dimensions(dimensions, target_dimensions)
filter = scale_filter(dimensions, target_dimensions)
webm = Briefly.create!(extname: ".webm")
mp4 = Briefly.create!(extname: ".mp4")
scale_filter = "scale=w=#{width}:h=#{height}"
{_output, 0} =
System.cmd("ffmpeg", [
@ -131,7 +130,7 @@ defmodule PhilomenaMedia.Processors.Webm do
"-crf",
"31",
"-vf",
scale_filter,
filter,
"-threads",
"4",
"-max_muxing_queue_size",
@ -152,7 +151,7 @@ defmodule PhilomenaMedia.Processors.Webm do
"-b:v",
"5M",
"-vf",
scale_filter,
filter,
"-threads",
"4",
"-max_muxing_queue_size",
@ -164,9 +163,8 @@ defmodule PhilomenaMedia.Processors.Webm do
end
defp scale_mp4_only(file, dimensions, target_dimensions) do
{width, height} = box_dimensions(dimensions, target_dimensions)
filter = scale_filter(dimensions, target_dimensions)
mp4 = Briefly.create!(extname: ".mp4")
scale_filter = "scale=w=#{width}:h=#{height}"
{_output, 0} =
System.cmd("ffmpeg", [
@ -188,7 +186,7 @@ defmodule PhilomenaMedia.Processors.Webm do
"-b:v",
"5M",
"-vf",
scale_filter,
filter,
"-threads",
"4",
"-max_muxing_queue_size",
@ -199,17 +197,23 @@ defmodule PhilomenaMedia.Processors.Webm do
mp4
end
defp scale_gif(file, duration, dimensions) do
defp scale_gif(file, duration, dimensions, target_dimensions) do
{width, height} = box_dimensions(dimensions, target_dimensions)
gif = Briefly.create!(extname: ".gif")
GifPreview.preview(file, gif, duration, dimensions)
GifPreview.preview(file, gif, duration, {width, height})
gif
end
defp scale_filter(dimensions, target_dimensions) do
{width, height} = box_dimensions(dimensions, target_dimensions)
"scale=w=#{width}:h=#{height},setsar=1"
end
# x264 requires image dimensions to be a multiple of 2
# -2 = ~1
def box_dimensions({width, height}, {target_width, target_height}) do
defp box_dimensions({width, height}, {target_width, target_height}) do
ratio = min(target_width / width, target_height / height)
new_width = min(max(trunc(width * ratio) &&& -2, 2), target_width)
new_height = min(max(trunc(height * ratio) &&& -2, 2), target_height)