Vid
1s Color MP4
1s Color MP4 is a MPEG-4 Part 14 sample generated for file format testing. It can be used to test downloads, parsers, previews, and file type detection.
color-1s.mp4Type Sample
2.2 KB DownloadVideo
MP4 MPEG-4 Part 14
MPEG-4 Part 14 is a video format commonly identified by .mp4, .m4v. Use the listed signatures, MIME types, and structure notes to validate files beyond the extension.
Extensions .mp4, .m4v
MIME video/mp4
Magic numbers
Analyze your fileoffset 4 MPEG-4 Part 14 signature at byte offset 4
66 74 79 70 ftypStructure
- ftyp box
- moov box
- mdat box
Caveats
- Do not trust the extension alone. Check the MIME type, the first bytes such as 66 74 79 70, and format-specific structure when possible.
- Container formats and damaged files can share the same opening bytes, so deeper validation may be required for production upload, preview, or conversion flows.
Detection example
SIGNATURE = bytes.fromhex("66747970")
OFFSET = 4
def is_mp4(path: str) -> bool:
with open(path, "rb") as f:
f.seek(OFFSET)
head = f.read(len(SIGNATURE))
return head == SIGNATUREconst SIGNATURE = [0x66, 0x74, 0x79, 0x70];
const OFFSET = 4;
// bytes: a Uint8Array / Buffer holding the start of the file
export function isMp4(bytes) {
return SIGNATURE.every((byte, i) => bytes[OFFSET + i] === byte);
}package fileid
import "bytes"
var ismp4Signature = []byte{0x66, 0x74, 0x79, 0x70}
const ismp4Offset = 4
func IsMp4(b []byte) bool {
end := ismp4Offset + len(ismp4Signature)
if len(b) < end {
return false
}
return bytes.Equal(b[ismp4Offset:end], ismp4Signature)
}const SIGNATURE: &[u8] = &[0x66, 0x74, 0x79, 0x70];
const OFFSET: usize = 4;
fn is_mp4(bytes: &[u8]) -> bool {
bytes.get(OFFSET..OFFSET + SIGNATURE.len()) == Some(SIGNATURE)
}<?php
$signature = "\x66\x74\x79\x70";
$offset = 4;
function is_mp4(string $bytes): bool {
global $signature, $offset;
return substr($bytes, $offset, strlen($signature)) === $signature;
}Practical usage
Use cases
MPEG-4 Part 14 is used for video previews, encoding checks, responsive UI testing, and upload flows. Container format and codecs are separate concerns, so leading bytes alone do not prove playability.
Common detection mistakes
- The .mp4 / .m4v extension alone does not prove the file contents. Upload and conversion flows should combine extension, MIME type, leading bytes, and format-specific structure checks.
- MPEG-4 Part 14 can start with signatures such as 66 74 79 70, but related containers and damaged files may require additional validation.
Security notes
Media files can still stress decoders through corrupt metadata, extreme dimensions, long durations, or unusual chunks. Read size, dimensions, and duration before processing.
Using samples
11 samples help test duration handling, playback startup, metadata reads, and download behavior.
Sample files
11 / 11 filesVid
Cloud Flight MP4 0.5s
Cloud Flight MP4 0.5s is a MPEG-4 Part 14 sample based on Wikimedia Commons, 160 x 284, 0.5s. It can be used to test downloads, parsers, previews, and file type detection.
01-flight-over-clouds.mp4Resolution 160 x 284 45 Kpx
8.1 KB SHA-256
3124ee6bdaa1142bdbc2ebf477978400df31a7fcabf0562affb499de8c290f5eVid
Cloud Flight MP4 1s
Cloud Flight MP4 1s is a MPEG-4 Part 14 sample based on Wikimedia Commons, 240 x 426, 1s. It can be used to test downloads, parsers, previews, and file type detection.
02-flight-over-clouds.mp4Resolution 240 x 426 102 Kpx
21 KB SHA-256
d11350777aacf7aa8c3364c7ca3f0989b287296b5671359dfca3287618142915Vid
Cloud Flight MP4 1.5s
Cloud Flight MP4 1.5s is a MPEG-4 Part 14 sample based on Wikimedia Commons, 320 x 568, 1.5s. It can be used to test downloads, parsers, previews, and file type detection.
03-flight-over-clouds.mp4Resolution 320 x 568 182 Kpx
44 KB SHA-256
fa15aeb91a3c364ab3b5b6092182fe0c4e80b2a7b8e771f93bb2cac91e7755d5Vid
Cloud Flight MP4 2s
Cloud Flight MP4 2s is a MPEG-4 Part 14 sample based on Wikimedia Commons, 480 x 854, 2s. It can be used to test downloads, parsers, previews, and file type detection.
04-flight-over-clouds.mp4Resolution 480 x 854 410 Kpx
111 KB SHA-256
23afe1e134a5aeaa69a47431901cd19de3ebc43fc92b4cc1d604aad8ac46c7d6Vid
Cloud Flight MP4 3s
Cloud Flight MP4 3s is a MPEG-4 Part 14 sample based on Wikimedia Commons, 640 x 1138, 3s. It can be used to test downloads, parsers, previews, and file type detection.
05-flight-over-clouds.mp4Resolution 640 x 1138 728 Kpx
286 KB SHA-256
f3a3c73d5b310686bdd689e6a132f3cff37259005500e9442c67af3aa1f3b104Vid
Cloud Flight MP4 4s
Cloud Flight MP4 4s is a MPEG-4 Part 14 sample based on Wikimedia Commons, 720 x 1280, 4s. It can be used to test downloads, parsers, previews, and file type detection.
06-flight-over-clouds.mp4Resolution 720 x 1280 922 Kpx
476 KB SHA-256
d22be9a592f3ca948c729150f45d5d2b83da9ff01a9cd8fb7b082a9daa9561c6Vid
Cloud Flight MP4 5s
Cloud Flight MP4 5s is a MPEG-4 Part 14 sample based on Wikimedia Commons, 854 x 1518, 5s. It can be used to test downloads, parsers, previews, and file type detection.
07-flight-over-clouds.mp4Resolution 854 x 1518 1.3 MP
806 KB SHA-256
1858f74816bb37cf927db55f8e4cfc38ca55335575647fcf00a25bec3f23f7afVid
Cloud Flight MP4 6s
Cloud Flight MP4 6s is a MPEG-4 Part 14 sample based on Wikimedia Commons, 960 x 1706, 6s. It can be used to test downloads, parsers, previews, and file type detection.
08-flight-over-clouds.mp4Resolution 960 x 1706 1.6 MP
1.13 MB SHA-256
a72e5fc64521419d8e95b825f1542df2c1d13c1730fa36594156030dd4b854c7Vid
Cloud Flight MP4 8s
Cloud Flight MP4 8s is a MPEG-4 Part 14 sample based on Wikimedia Commons, 1080 x 1920, 8s. It can be used to test downloads, parsers, previews, and file type detection.
09-flight-over-clouds.mp4Resolution 1080 x 1920 2.1 MP
1.83 MB SHA-256
720bb0e33645c5adca2ef6f89ebd71dfecd4493c355c880842cf97ac9c348801Vid
NASA Clouds MP4
NASA Clouds MP4 is a MPEG-4 Part 14 sample based on NASA Image and Video Library, 480 x 270, 2s. It can be used to test downloads, parsers, previews, and file type detection.
nasa-clouds-orbit.mp4Resolution 480 x 270 130 Kpx
142 KB SHA-256
f9c04946c8e8510a5acca1db961cfa14839a7d8e95dfc6157b93f824fc001e8eFrequently asked questions
What is the magic number (file signature) of MPEG-4 Part 14?
MPEG-4 Part 14 files begin with the byte signature 66 74 79 70 ("ftyp"). Detect the format by reading these leading bytes rather than trusting the file extension alone.
What is the MIME type of MPEG-4 Part 14?
The MIME type for MPEG-4 Part 14 is video/mp4.
What file extension does MPEG-4 Part 14 use?
MPEG-4 Part 14 files use the .mp4, .m4v extension. The extension is a convention only and does not guarantee the file contents, so combine it with signature and structure checks.