Troubleshooting of FFmpeg - Revision history

Planetoid: /* Further readings */

2026-04-04T02:32:03Z

Planetoid at 02:31, 4 April 2026

2026-04-04T02:31:10Z

← Older revision		Revision as of 10:31, 4 April 2026
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	== Troubleshooting of FFmpeg ==		== Troubleshooting of FFmpeg ==
	== File Overwrite Issue When Integrating FFmpeg with PHP ==		=== File Overwrite Issue When Integrating FFmpeg with PHP ===

	'''Error condition''':		'''Error condition''':
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	Or implement the file overwrite control directly in your PHP script logic.		Or implement the file overwrite control directly in your PHP script logic.

	== FFmpeg Fails to Decode Large JPEG Images ==		=== FFmpeg Fails to Decode Large JPEG Images ===

	'''Error condition''':		'''Error condition''':

Planetoid: /* Further readings */

2026-04-04T02:17:45Z

Planetoid: /* File Overwrite Issue When Integrating FFmpeg with PHP */

2026-04-04T02:15:27Z

File Overwrite Issue When Integrating FFmpeg with PHP

← Older revision		Revision as of 10:15, 4 April 2026
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	Or implement the file overwrite control directly in your PHP script logic.		Or implement the file overwrite control directly in your PHP script logic.

			== FFmpeg Fails to Decode Large JPEG Images ==

			'''Error condition''':
			When processing high-resolution JPEG images, FFmpeg reports the image size as invalid and aborts decoding entirely.

			Original command:
			<pre>
			ffmpeg -i "image.jpg" -vf scale=2000:-1 output.jpg
			</pre>

			Error output:
			<pre>
			[mjpeg @ 0x...] [IMGUTILS @ 0x...] Picture size 25600x14400 is invalid
			[image2 @ 0x...] Could not find codec parameters for stream 0: unspecified size
			Conversion failed!
			</pre>

			Root cause:
			FFmpeg's internal function `av_image_check_size2()` (in `libavutil/imgutils.c`) validates image dimensions before decoding begins — before the pixel format (`pix_fmt`) is known. Without `pix_fmt`, FFmpeg assumes the worst-case bytes-per-pixel (bpp = 6), then checks:

			<pre>
			stride * (height + 128) >= INT_MAX // INT_MAX = 2,147,483,647
			</pre>

			For a 25600×14400 image with bpp = 6:
			<pre>
			stride = 25600 × 6 = 153,600
			result = 153,600 × (14400 + 128) = 2,231,500,800 → exceeds INT_MAX ✗
			</pre>

			The actual pixel format of the image is `yuvj420p` (bpp = 1.5), which would pass the check:
			<pre>
			stride = 25600 × 1.5 = 38,400
			result = 38,400 × (14400 + 128) = 557,875,200 → within INT_MAX ✓
			</pre>

			FFmpeg cannot read `pix_fmt` before running the size check, so the image is incorrectly rejected. Passing `-vcodec mjpeg` or `-pix_fmt` does not help — the check runs before any codec parameters take effect.

			'''Solution''':

			Use ImageMagick instead of FFmpeg for large JPEG files:
			<pre>
			magick "image.jpg" -resize 2000x2000\> "output.jpg"
			</pre>

			The `\>` flag shrinks only — no enlargement if the image is already smaller than the target.

			Or use Pillow to pre-scale before passing to FFmpeg:
			<pre>
			python3 -c "
			from PIL import Image
			Image.MAX_IMAGE_PIXELS = None
			img = Image.open('image.jpg')
			img.thumbnail((4000, 4000))
			img.save('temp.jpg', quality=90)
			" && ffmpeg -i temp.jpg -vf scale=2000:-1 output.jpg
			</pre>

			Note: `Image.MAX_IMAGE_PIXELS = None` disables Pillow's decompression bomb protection. Only use this for trusted image sources.<ref>[https://github.com/GyanD/codexffmpeg/issues/114 ffmpeg & ffprobe: large JPEG error (Picture size 14106x19746 is invalid) · Issue #114 · GyanD/codexffmpeg]</ref><ref>[https://trac.ffmpeg.org/ticket/8030 #8030 (IMGUTILS, failure handling big images) – FFmpeg]</ref>

	== Further readings ==		== Further readings ==

Planetoid: /* File Overwrite Issue When Integrating FFmpeg with PHP = */

2026-04-04T02:07:43Z

File Overwrite Issue When Integrating FFmpeg with PHP =

← Older revision		Revision as of 10:07, 4 April 2026
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	== Troubleshooting of FFmpeg ==		== Troubleshooting of FFmpeg ==
	== File Overwrite Issue When Integrating FFmpeg with PHP ===		== File Overwrite Issue When Integrating FFmpeg with PHP ==

	'''Error condition''':		'''Error condition''':

Planetoid at 07:48, 8 April 2025

2025-04-08T07:48:07Z

← Older revision		Revision as of 15:48, 8 April 2025
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	{{Tip \| tip='''What is FFmpeg?''' FFmpeg is a leading multimedia framework that supports decoding, encoding, transcoding, streaming, filtering, and playing virtually any multimedia format, from old and obscure to cutting-edge. It's highly portable and runs across various operating systems, including Linux, macOS, Windows, and more. Detail on [https://ffmpeg.org/about.html About FFmpeg]}}		{{Tip \| tip='''What is FFmpeg?''' FFmpeg is a leading multimedia framework that supports decoding, encoding, transcoding, streaming, filtering, and playing virtually any multimedia format, from old and obscure to cutting-edge. It's highly portable and runs across various operating systems, including Linux, macOS, Windows, and more. Detail on [https://ffmpeg.org/about.html About FFmpeg]}}

	== File Overwrite Issue When Integrating FFmpeg with PHP ==		== Troubleshooting of FFmpeg ==
			== File Overwrite Issue When Integrating FFmpeg with PHP ===

	'''Error condition''':		'''Error condition''':
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	Or implement the file overwrite control directly in your PHP script logic.		Or implement the file overwrite control directly in your PHP script logic.

			== Further readings ==
			* [https://zulko.github.io/moviepy/ MoviePy documentation — MoviePy documentation]

	[[Category: Software]]		[[Category: Software]]
	[[Category: Video]]		[[Category: Video]]
	[[Category: PHP]]		[[Category: PHP]]

Planetoid at 05:44, 7 April 2025

2025-04-07T05:44:17Z

← Older revision		Revision as of 13:44, 7 April 2025
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	{{Draft}}		{{Draft}}

			{{Tip \| tip='''What is FFmpeg?''' FFmpeg is a leading multimedia framework that supports decoding, encoding, transcoding, streaming, filtering, and playing virtually any multimedia format, from old and obscure to cutting-edge. It's highly portable and runs across various operating systems, including Linux, macOS, Windows, and more. Detail on [https://ffmpeg.org/about.html About FFmpeg]}}

	== File Overwrite Issue When Integrating FFmpeg with PHP ==		== File Overwrite Issue When Integrating FFmpeg with PHP ==

Planetoid: Created page with "Troubleshooting of FFmpeg issues {{Draft}} == File Overwrite Issue When Integrating FFmpeg with PHP == '''Error condition''': When integrating FFmpeg commands with PHP scripts, if the output file already exists, FFmpeg displays an overwrite confirmation prompt. However, this prompt is not visible in the PHP execution environment. This causes the PHP script to pause, waiting for user input, without any visible prompt. Original command:

 ffmpeg -i input.mp4 -vf sc..."

2025-04-07T04:30:49Z

Created page with "Troubleshooting of FFmpeg issues {{Draft}} == File Overwrite Issue When Integrating FFmpeg with PHP == '''Error condition''': When integrating FFmpeg commands with PHP scripts, if the output file already exists, FFmpeg displays an overwrite confirmation prompt. However, this prompt is not visible in the PHP execution environment. This causes the PHP script to pause, waiting for user input, without any visible prompt. Original command: <pre> ffmpeg -i input.mp4 -vf sc..."

New page

Troubleshooting of FFmpeg issues

{{Draft}}

== File Overwrite Issue When Integrating FFmpeg with PHP ==

'''Error condition''':
When integrating FFmpeg commands with PHP scripts, if the output file already exists, FFmpeg displays an overwrite confirmation prompt. However, this prompt is not visible in the PHP execution environment. This causes the PHP script to pause, waiting for user input, without any visible prompt.

Original command:
<pre>
ffmpeg -i input.mp4 -vf scale=720:404 -c:v libx264 -crf 23 -preset fast -c:a aac -b:a 128k output.mp4
</pre>

Prompt in terminal environment:
<pre>
File 'output.mp4' already exists. Overwrite? [y/N]
</pre>

'''Solution''':
Add parameters to the FFmpeg command to control file overwrite behavior:

First option: '''Auto-overwrite option''':
<pre>
ffmpeg -y -i input.mp4 -vf scale=720:404 -c:v libx264 -crf 23 -preset fast -c:a aac -b:a 128k output.mp4
</pre>

Second option: '''Skip if file exists option''':
<pre>
ffmpeg -n -i input.mp4 -vf scale=720:404 -c:v libx264 -crf 23 -preset fast -c:a aac -b:a 128k output.mp4
</pre>

Or implement the file overwrite control directly in your PHP script logic.

[[Category: Software]]
[[Category: Video]]
[[Category: PHP]]

← Older revision		Revision as of 10:32, 4 April 2026
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	== Further readings ==		== Further readings ==
	* [https://zulko.github.io/moviepy/ MoviePy documentation — MoviePy documentation]		* [https://zulko.github.io/moviepy/ MoviePy documentation — MoviePy documentation]
			* [[Speed_up_websites#Image_Compression \| Image Compression]]

	== References ==		== References ==

← Older revision		Revision as of 10:17, 4 April 2026
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	== Further readings ==		== Further readings ==
	* [https://zulko.github.io/moviepy/ MoviePy documentation — MoviePy documentation]		* [https://zulko.github.io/moviepy/ MoviePy documentation — MoviePy documentation]

			== References ==
			<references />

	[[Category: Software]]		[[Category: Software]]
	[[Category: Video]]		[[Category: Video]]
	[[Category: PHP]]		[[Category: PHP]]