VLC's H.264 + AAC (MP4) Profile: What It Is and How to Use It

What "Video - H.264 + AAC (MP4)" Means in VLC

When you open VLC's Convert/Save dialog, the profile dropdown shows a list of presets. Near the top is Video - H.264 + AAC (MP4). This is the most widely compatible general-purpose conversion preset VLC ships with, and it is the right starting point for most format conversion tasks.

Let's break down each component of the name:

• H.264 (also called AVC, Advanced Video Coding) is the video codec. It encodes the picture stream using a compression algorithm that has been the universal standard since around 2004. Every smartphone, browser, TV, game console, and media player released in the past fifteen years can decode H.264 without extra software. It is not the most efficient codec — H.265 achieves similar quality at half the file size — but it is the most compatible.

• AAC (Advanced Audio Coding) is the audio codec. It replaced MP3 as the default audio format for most digital distribution. AAC at 128 kbps is audibly equivalent to MP3 at 192 kbps. Like H.264, AAC is supported natively on every major platform.

• MP4 is the container format (technically MPEG-4 Part 14). It is the wrapper that holds the H.264 video stream and the AAC audio stream together in a single file. MP4 is not a codec; it is the box that carries both streams plus timing, chapter, and metadata information.

Together, H.264 video + AAC audio wrapped in an MP4 container is the most universally playable combination in digital video. If you need a file that "just works" everywhere — email attachments, USB drives, website uploads, social media, TV sticks — this profile produces it.

When to Use This Profile (and When Not To)

Use "Video - H.264 + AAC (MP4)" when:

• You have a video in an obscure or poorly-supported container (.flv, .avi, .wmv, .rmvb, .ts, .m2ts)
• You need the file to play on a device you do not control (a client's laptop, a classroom TV, a conference room projector)
• You need to upload to a web platform, social media site, or video hosting service
• You are sharing with someone who is not technically savvy
• You want a reliable archive copy in a well-understood format
• You have an MKV with H.264 video and AAC audio already inside — you can remux (change container only) rather than re-encode, which is faster and lossless

Do NOT use this profile when:

• Your source is already H.264 + AAC in an MP4 container — re-encoding the same codec introduces quality loss for no benefit. Use a remux tool or online converter that detects the codec and stream-copies instead of re-encodes.
• You need small file sizes for 4K content — H.265 (HEVC) achieves the same quality at roughly half the bitrate. For 4K archiving, H.264 produces large files.
• You need to keep multiple audio tracks, subtitles, or chapters — MP4 supports multiple audio tracks but subtitle format support is limited. MKV is better for content with multiple embedded streams.
• You need professional editing quality — use a lossless or ProRes format, not H.264, as your editing master.

Step-by-Step: Converting a Video Using This Profile in VLC

VLC's conversion feature is buried under a misleading menu item — it says "Convert/Save" which sounds like a file manager operation. Here is the full walkthrough.

On Windows and Linux

1. Open VLC. Do not open the video file first.
2. Go to Media → Convert/Save (or press Ctrl+R).
3. In the "Open Media" dialog, click Add and select your source file.
4. Click the Convert/Save button (not "Play").
5. In the "Convert" dialog:
   • Under Profile, select Video - H.264 + AAC (MP4) from the dropdown.
   • Under Destination, click Browse and choose where to save the output file. Make sure the filename ends in .mp4.
6. Click Start.

VLC will show a progress bar in the main window. The video playback controls will move as the conversion processes. Do not close VLC until it finishes.

On macOS

The steps are identical but the menu path is slightly different:

1. Open VLC.
2. Go to File → Convert / Stream.
3. Drag your source file into the "Convert & Stream" window.
4. Click Customize next to the profile if you want to adjust settings, or leave the default profile selected.
5. Under "Choose Profile", select Video - H.264 + AAC (MP4).
6. Click Save as File, choose a destination, and click Go!.

Understanding the Profile Settings

When you click the wrench/edit icon next to the profile in VLC, the profile editor shows three tabs: Encapsulation, Video codec, and Audio codec.

Encapsulation Tab

This sets the container. For this profile it is MP4/MOV — do not change it for this workflow.

Video Codec Tab

Key settings:

Bitrate vs quality: The default "0" in the bitrate field means VLC uses a constant rate factor (CRF) approach where quality is the primary target and file size varies. If you need a specific file size (e.g., email attachment limits), set a target bitrate instead. For 1080p content, typical bitrates are:

• 8,000 kb/s: high quality, ~60 MB per minute
• 4,000 kb/s: good quality, ~30 MB per minute
• 1,500 kb/s: acceptable for streaming, ~11 MB per minute

Audio Codec Tab

128 kb/s AAC is transparent for speech and most music. If your source is a music video or you notice audio quality loss, raise to 192.

Editing or Duplicating the Profile

VLC's built-in profiles are read-only, but you can duplicate them. In the Convert dialog, click the duplicate icon (two pages) next to the profile name. This creates an editable copy. Give it a name like "H.264 + AAC 720p" or "H.264 + AAC High Quality" and adjust the settings. Your custom profiles persist across VLC restarts.

Useful custom profile variations:

720p downscale:

• Video codec tab → Width: 1280, Height: 720
• Good for reducing 4K or 1080p source files for web sharing

High-quality archive:

• Video codec tab → Bitrate: 8000
• Audio codec tab → Bitrate: 192
• Produces larger files but maximises quality

Small-file social media:

• Video codec tab → Bitrate: 2500
• Audio codec tab → Bitrate: 128
• Under 15 MB per minute — suitable for most social media upload limits

Common Problems and Fixes

VLC Produces a 0 KB or Empty File

This almost always means the output path had a problem — the destination folder does not exist, or VLC does not have write permission. Fix:

• Choose a simple destination like C:\Users\YourName\Desktop\output.mp4 (Windows) or ~/Desktop/output.mp4 (Linux/macOS)
• Avoid paths with special characters or network shares on first attempt
• Make sure you clicked Browse and set a filename — if the destination field is blank, VLC creates no output

The Output File Has Video But No Audio

The source file uses an audio codec that VLC's AAC encoder could not transcode from. Check the source audio codec (Media → Codec Information in VLC during playback). If the source is DTS, Dolby TrueHD, or certain PCM variants, VLC may fail silently. Try setting the audio codec in the profile to MP3 first to confirm the audio path works, then switch back to AAC.

Conversion Is Extremely Slow

VLC's software H.264 encoder does not use GPU acceleration by default. On older hardware, 1080p encoding may take 3–5× real-time (a 10-minute video takes 30–50 minutes). To speed up:

• In the video codec tab, set Codec to h264_nvenc (Nvidia) or h264_vaapi (Intel/AMD on Linux) to enable hardware encoding. These accelerated encoders encode at real-time or faster but VLC's codec name must match what your hardware supports.
• If hardware encoding is not available, lower the output resolution (to 720p) to reduce encoding workload.

The Output MP4 Does Not Seek Correctly

Some MP4 files produced by VLC place the moov atom (the file's index) at the end rather than the beginning. Some players and streaming services expect it at the start for fast start / progressive download. Fix by running ffmpeg or a similar tool on the output file:

ffmpeg -i input.mp4 -c copy -movflags +faststart output.mp4

The -c copy flag remuxes without re-encoding; -movflags +faststart moves the moov atom to the front. This is a quick post-process step, not a full re-encode.

Audio and Video Are Out of Sync in the Output

Sync drift is common when the source file has variable frame rates (VFR) — common with screen recordings and content captured by smartphones. VLC does not handle VFR well in the H.264 encoder. For VFR sources, use FFmpeg directly:

ffmpeg -i input.mp4 -vf fps=30 -c:v libx264 -c:a aac output.mp4

The -vf fps=30 filter normalises to constant 30 fps, which eliminates the sync drift.

When VLC Is Not the Right Tool for the Job

VLC's Convert/Save is designed as a convenience feature, not a professional transcoder. It works well for occasional single-file conversions. For anything more complex, dedicated tools produce better results.

FFmpeg (command line) gives you full control over every encoding parameter — bitrate modes, filter chains, metadata, hardware acceleration, and batch processing. See FFmpeg advanced filters guide for examples.

Online converter — if you need to convert one or two files and do not want to configure any tool, ConvertIntoMP4 handles MOV to MP4, AVI to MP4, MKV to MP4, and dozens of other combinations in the browser. The converter automatically detects whether a stream-copy (lossless remux) is possible and avoids unnecessary re-encoding — something VLC always re-encodes even when unnecessary. For one-off conversions where file quality matters, this is often the faster option.

The video converter hub lists all supported input and output formats if you need something outside the common H.264 + AAC + MP4 combination.

Frequently Asked Questions

Does re-encoding to H.264 + AAC in VLC reduce quality?

Yes, any lossy-to-lossy transcode degrades quality. The degree depends on the bitrate you set. If your source is already H.264 + AAC in an MP4 container, avoid re-encoding entirely — just copy the file or use a remux tool to change the container without touching the streams.

What is the difference between this profile and "Video for MPEG4 720p TV/device"?

The MPEG4 720p device profile uses the older MPEG-4 Part 2 video codec (sometimes called "XviD" or "DivX" quality), not H.264. "Video - H.264 + AAC (MP4)" uses the more modern and efficient H.264 codec. For everything except very old devices that only support MPEG-4 Part 2, use the H.264 profile.

Can I use this profile to convert audio-only files?

You can, but it is not ideal. For audio-only output, use the "Audio - MP3" or "Audio - AAC" profiles in VLC's profile list. Using the video profile on an audio source creates an MP4 with a video stream of 0 bytes, which some players handle poorly.

How do I convert a whole folder of videos in VLC?

VLC's Convert/Save dialog handles one file at a time. For batch conversion, use FFmpeg in a shell loop (see the batch processing files guide) or ConvertIntoMP4's API for programmatic batch jobs.

Why does my converted MP4 not play on my Samsung TV?

Samsung Smart TVs support H.264 Baseline and Main profiles up to a certain level. VLC's H.264 encoder defaults to High profile, which some older Samsung TVs reject. In the profile editor, under Video codec → Advanced settings, set Profile to baseline or main and Level to 4.0. This maximises compatibility with older TV hardware.

Is "Video - H.264 + AAC (MP4)" the same as "MP4" conversion everywhere?

Not exactly. "MP4" describes the container only. A file can be MP4 container with HEVC video, or MP4 with MPEG-4 Part 2 video. "Video - H.264 + AAC (MP4)" specifically means the H.264 video codec and AAC audio codec inside an MP4 container — which is indeed the most common and compatible combination, but not the only way to make an MP4 file.

Summary

VLC's Video - H.264 + AAC (MP4) profile converts nearly any video format into the most universally playable output: H.264 video codec, AAC audio codec, MP4 container. Use it through Media → Convert/Save (Windows/Linux) or File → Convert / Stream (macOS). Set a target bitrate in the profile editor if you need size control; otherwise leave the defaults for automatic quality. For batch work or more precise control over encoding parameters, FFmpeg or an online converter will serve you better.