Tips & Tricks

What is the Best Video Codec for Streaming?

7 min read
Video Codec

Maintaining video quality is always a challenge in video streaming. The success and audience engagement of live streaming depend on the streaming quality. Various technical factors deal with streaming quality. Video compression technology, or codec, is one of the main factors. Multiple codecs, such as H 264, H 265, and VP9, are available. Each of these codecs has its own strengths and weaknesses. So, choosing the right one for streaming is important to ensure quality.

This blog will explain which one is the best video codec for streaming. Let’s get started!

What is A Video Codec?

A video codec is a software tool that compresses and decompresses digital video data. Video codecs are used to reduce the amount of data needed to store or transmit video while preserving as much quality as possible. This process is crucial for maintaining high video quality while reducing the file size. The efficiency of the codec used often determines the best video format for streaming.

Various video codecs are available, each designed to meet different needs in terms of compression, quality, and compatibility. Some of the well-known codecs include:

These video codecs are classified into two main categories:

  • Lossy codecs
  • Lossless codecs.

Modern video codecs are designed to balance video quality and compression. This balance ensures that videos can be streamed smoothly over the internet without taking up too much bandwidth and data loss. The codec choice can significantly affect the video quality and viewing experience.

Lossless VS. Lossy Video Codecs

Lossless codecs compress video data without losing any information, ensuring the original quality is preserved. On the other hand, lossy codecs reduce file size by removing some video data deemed less important.

Lossless codecs are ideal for professional video editing, where every detail matters—however, lossless compression results in larger file sizes, which might need to be more practical for online streaming.

Lossy codecs can affect the video quality, but the reduced file size makes streaming videos online easier. Maintaining good video quality and achieving manageable file sizes for efficient streaming is key.

How does Video Compression Work?

Video compression is a critical process that reduces large video file’ size. This process is essential for streaming online videos efficiently. Video codecs work by encoding and decoding digital video files. Encoding is the process of compressing video data, while decoding is decompressing the data to play the video.

The codec analyzes the video files during the encoding phase to identify and eliminate redundant or unnecessary information. This might include parts of the video that stay mostly the same from one frame to the next, such as a static background. By focusing on the differences between successive frames, codecs can significantly reduce the data required to represent a video.

After encoding, a compressed video file is much smaller and easier to transmit over the internet. The decoding process reverses the compression when a user wants to watch the video. It reconstructs the video data to be viewed at a quality that closely resembles the original.

The effectiveness of video encoding and decoding directly impacts the quality of online videos. A well-compressed video will stream smoothly even on slower internet connections, making it accessible to a wider audience. However, the challenge lies in balancing the compression to ensure that the video quality remains high while the file size is kept to a minimum. This balance is crucial for delivering a good viewing experience to users.

What is the Best Video Codec?

Determining the best video codec largely depends on the specific needs of a project. However, H264 and H265 both are the best video codecs for many. Both codecs stand out for their efficiency and quality. H264 is known for balancing high video quality with low bit rates. This makes it a go-to option for streaming and broadcasting.

H265 takes this further by offering even better compression. This means you can stream high-quality videos while using less data. H265 also supports higher resolutions, up to 8K. This makes it ideal for future-proofing content. Both codecs ensure that videos look great, even at lower bit rates. This is crucial for streaming over the internet.

When considering device compatibility, H264 stands out for its broad support across various devices. This codec is widely accepted and can be played on nearly all internet-connected devices. This includes smartphones, tablets, PCs, and smart TVs. Its universal acceptance makes H264 an excellent choice for ensuring your content is accessible to a wide audience without compatibility issues.

On the other hand, H265, while offering superior compression and quality, has slightly more limited device compatibility. It’s noteworthy that H.265 compatibility has significantly improved across modern devices. Most new smartphones, computers, and smart TVs now support H.265 natively.

Castr supports both H264 and H265. On Castr, you can choose the codec that best matches your streaming needs. Whether it’s the broad compatibility of H264 or the advanced features of H265, Castr has you covered. This flexibility ensures your content reaches your audience in the best quality possible.


One of the most widely used codecs is H264, also known as Advanced Video Coding (AVC). This codec is renowned for its efficiency in balancing quality and compression ratio, making it a preferred choice for various applications.

H264 has become a standard in video file formats, offering a high level of compatibility across devices and platforms. Its ability to provide high-quality video at relatively low bitrates makes it an excellent choice for streaming online content. The codec achieves this through sophisticated compression techniques that minimize file size without significantly impacting visual quality.

The versatility of the H264 codec extends to a wide range of file formats, making it a go-to option for both high-definition video content and lower-resolution videos. Its widespread adoption is partly due to its excellent quality and compression ratio, ensuring that videos look good even with limited bandwidth. This balance makes H264 a cornerstone in the realm of digital video.

Key Features of H264

  • Efficiency: Provides high-quality video at significantly lower bit rates without increasing complexity or cost.
  • Flexibility: Suitable for various applications, from low to high bit rates and resolutions across various networks and systems.
  • Profiles: Features a family of standards with multiple profiles, with the “High profile” being the most commonly used.
  • Compression Techniques: Utilizes reduced-complexity integer DCT, variable block-size segmentation, and multi-picture inter-picture prediction for efficient compression.
  • Standardization: Jointly standardized by ITU-T VCEG and ISO/IEC MPEG, ensuring identical technical content in both standards.
  • Extensions: Includes Fidelity Range Extensions for higher quality, Scalable Video Coding (SVC) for scalability, and Multiview Video Coding (MVC) for multiple scene views.
  • Widespread Use: Dominant in Blu-ray Discs, streaming services (e.g., Netflix, Hulu, YouTube), web software, and HDTV broadcasts.
  • Licensing: Subject to royalties, though exceptions exist for free-to-end-user internet streaming.


H265 is a new way of making video files smaller and better. It is also called HEVC, which stands for High Efficiency Video Coding.

Key Features of H265

  • Improved Compression: H.265 offers 25% to 50% better compression efficiency than H.264, maintaining quality at lower bitrates.
  • Higher Resolution Support: Supports 8192×4320 resolutions, including 8K UHD.
  • Enhanced Bit Depth: Supports higher fidelity with the Main 10 profile, going beyond 8-bit depth.
  • Variable Block Sizes: Uses coding tree units (CTUs) ranging from 4×4 to 64×64 for flexible compression.
  • Improved Intra-frame Prediction: Features 33 directional modes for more accurate intra-frame predictions.
  • Advanced Inter-frame Prediction: Enhances pixel prediction from other frames for better efficiency.
  • Improved Parallel Processing: Introduces tiles and wavefront parallel processing for efficient decoding/encoding.
  • Better Filtering Techniques: Employs deblocking and sample adaptive offset (SAO) filters to reduce artifacts.
  • High Efficiency: Designed for low-bit-rate encoding while maintaining video quality.
  • HDR and Wide Color Gamut Support: Supports Rec. 2020 and Rec. 2100 for HDR content and wider color ranges.
  • Flexible Entropy Coding: Uses context-adaptive binary arithmetic coding (CABAC) for higher throughput.


In conclusion, choosing the right video codec ensures high-quality video streaming. Both H264 and H265 codecs offer a balance between maintaining video quality and managing file sizes, making them ideal for streaming purposes. While H264 is widely supported and offers great compatibility, H265 provides superior compression and supports higher resolutions. The decision on which codec to use depends on your specific needs, including the type of content you’re streaming and the devices your audience uses.

For those looking to stream high-quality videos efficiently, Castr offers a comprehensive live-streaming solution that supports both H264 and H265 codecs. With Castr, you can ensure your content reaches your audience in the best quality possible, regardless of their device or internet connection. Try Castr today and take your live-streaming experience to the next level.

Join 200,000+ satisfied streamers

Still on the fence? Take a sneak peek and see what you can do with Castr.

No Castr Branding

No Castr Branding

We do not include our branding on your videos.

No Commitment

No Commitment

No contracts. Cancel or change your plans anytime.

24/7 Support

24/7 Support

Highly skilled in-house engineers ready to help.

  • Check Free 7-day trial
  • CheckCancel anytime
  • CheckNo credit card required

Related Articles