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A codec determines how video is compressed; an encoder is the software or hardware that applies that compression. For a live stream, choose a codec your streaming service accepts and your viewers’ devices can play, then make sure your encoder, bitrate, keyframes, and delivery format suit the stream. H.264 is often a practical compatibility-first starting point, but the destination’s current requirements—not a general rule—should decide.
What a codec does—and what an encoder does
Video consists of a sequence of frames. Sending every frame uncompressed would require far more data than most live workflows can reasonably carry, so encoding compresses the video. A codec is the coding format: H.264/AVC, HEVC/H.265, and AV1 are examples. An encoder is a particular software or hardware implementation that compresses the frames using a codec. x264, for example, is a software H.264 encoder; NVENC is a family of hardware encoding implementations available on supported NVIDIA hardware.
These terms describe different parts of the process. Selecting H.264 identifies a format, not a specific encoder, preset, or quality level. The implementation and its settings affect encoding load and the resulting video. A hardware encoder can shift work from the CPU to specialized hardware, but available codecs and features depend on the device, its generation, and the software using it.
Codec, container, and delivery are not interchangeable
The codec describes how the video is compressed. A container or media format packages encoded audio and video, while a delivery protocol carries media to viewers. HLS is one delivery workflow; it is not itself a video codec. A format that can be authored for HLS is not automatically accepted by every live-streaming service. Check the ingest requirements for your destination and the playback support of the devices you want to reach.
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Which codec should you use for a live stream?
Start with the destination service’s current ingest specifications and your audience’s devices. OBS’s published format guidance describes H.264 as the most broadly supported streaming codec among the options discussed here. Apple’s HLS authoring guidance includes H.264, HEVC, Dolby Vision, and AV1, but that applies to its HLS context; it does not establish that any live platform accepts every listed format.
| Format | When to consider it | Important qualification |
|---|---|---|
| H.264/AVC | A compatibility-first choice when the service and audience requirements point to broad device support. Apple’s cited HLS guidance recommends High Profile in preference to Main or Baseline for that authoring use case. | Confirm the live service’s current requirements. Apple’s HLS authoring rules and OBS’s guidance are not guarantees for every destination. |
| HEVC/H.265 | Consider it when the service, encoder, delivery path, and target playback devices all support it. | Support and encoder availability vary. Apple’s cited HLS guidance requires fragmented MP4 (fMP4) for HEVC; do not assume it is a drop-in H.264 replacement. |
| AV1 | Consider it where the encoder and the entire delivery route support it. | Apple includes AV1 in its HLS guidance, which requires fMP4 in that context. OBS documents platform and hardware constraints; universal live-ingest support is not established. |
There is no universally best codec independent of the workflow. Compare the candidates using service and device support, quality at the available bitrate for your actual content, real-time encoding capacity, latency and packaging requirements, and the combined effects of resolution, frame rate, and HDR or SDR. Fast motion, fine detail, and noisy images can behave differently from simple scenes, so a theoretical efficiency claim is not a substitute for testing your own stream.
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What bitrate should you use?
Bitrate is the amount of encoded data produced or delivered over time. It is not determined by resolution alone. Apple’s HLS guidance identifies codec, encoder implementation, resolution, frame rate, HDR or SDR, content complexity, and desired subjective quality as factors in bitrate selection. Available upload capacity, destination limits, and viewer playback support also constrain a live workflow.
Apple publishes HLS bitrate ladders as initial targets for that delivery context, not universal live-stream prescriptions. A ladder pairs different resolutions and frame rates with multiple bitrate variants so adaptive delivery can offer a suitable stream as viewing conditions change. If you are building an HLS workflow, treat those values as starting points to evaluate against your content and route. For a platform that provides its own ingest recommendations or limits, use its current guidance instead.
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- Choose resolution and frame rate for the content and the bandwidth you can sustain, rather than maximizing both by default.
- Set bitrate with the codec and encoder implementation in mind, and account for motion, fine detail, noise, and HDR or SDR.
- Leave enough network capacity for a stable upload; a setting that exceeds what the connection can sustain can undermine delivery regardless of codec.
- Test representative content, including the most demanding scenes, through the actual service and delivery path.
No single bitrate figure is reliable for every codec, encoder, resolution, frame rate, and kind of footage. Treat any published ladder as context-specific guidance, not a promise of a particular visual result.
Keyframes and packaging: settings that affect interoperability
Keyframes provide points from which a decoder can begin reconstructing a stream. Their timing can affect delivery compatibility and latency. Apple recommends IDR keyframes every two seconds in its HLS authoring guidance. That is an HLS recommendation, not a universal setting for every live service: follow the destination’s current keyframe requirements if it specifies them.
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Packaging requirements can also depend on the codec. In Apple’s cited HLS rules, H.264 may use fragmented MP4 or MPEG transport stream, while HEVC requires fragmented MP4. Do not infer from those rules that another service uses the same packaging or accepts the same codec. Confirm the entire route—from encoder output through ingest and delivery to viewer playback—before settling on a configuration.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Should you use CPU or GPU encoding?
Software and hardware encoding are different ways to perform encoding work, not different codecs. Software encoding uses the processor through a software implementation; hardware encoding uses supported specialized components. Hardware encoding can reduce CPU work, but whether it is the right choice depends on the required codec, the available device, its generation, the encoder implementation, and whether it can sustain the chosen real-time workload.
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OBS’s advanced NVENC documentation describes options that are limited to particular codecs, such as HEVC or AV1, or to specific GPU generations. Therefore, the presence of a hardware encoder does not imply support for every codec or advanced setting. Check the encoder options available in your software and verify that the machine can keep up at the resolution, frame rate, and settings you intend to stream. If it cannot sustain real-time encoding, lower the workload or use a supported alternative.
A practical setup sequence
- Check the destination first. Read the streaming service’s current ingest requirements for accepted codecs, resolution and frame rate, bitrate limits, keyframe interval, and any required output or packaging format. Check playback support for the devices your viewers use as well.
- Choose a suitable picture format. Match resolution and frame rate to your content and available network capacity. For a compatibility-first workflow, H.264 is often a reasonable candidate, but use another format only when the service, encoder, and playback route support it.
- Select the encoder implementation. Choose a software or hardware encoder that supports the required codec and can encode the selected workload in real time. Confirm which settings are actually available on your system.
- Set bitrate for the whole workflow. Consider codec, implementation, resolution, frame rate, HDR or SDR, scene complexity, desired quality, upload capacity, and platform limits together. Use a platform-specific recommendation or an HLS ladder only in its stated context, then evaluate it with your actual footage.
- Set keyframes and packaging to match the route. Follow the live service’s requirements. Apple’s two-second IDR guidance and its HLS container rules apply to its documented HLS authoring context, not automatically to other ingest paths.
- Run a representative test. Test the actual encoder and service with typical scenes and demanding motion or detail. Check for encoding overload, unstable delivery, playback failures, and device compatibility, then adjust one relevant setting at a time.
Common codec and encoding problems
- The service rejects the stream: The chosen codec, profile, packaging, keyframe cadence, or other ingest setting may not meet the destination’s current requirements. Recheck its specification and match the output exactly; do not assume that HLS format support proves live-ingest support.
- Viewers cannot play the stream on some devices: The playback clients may not support the chosen codec or delivery format. Verify client support and use a more widely supported option, such as H.264 where appropriate, if broad compatibility is more important than using another format.
- The encoder cannot keep up: The software or hardware implementation may not sustain the selected real-time workload. Check that the intended encoder is selected and supports the codec and features you enabled; reduce resolution, frame rate, or other workload demands if necessary.
- Quality is poor despite a high bitrate: Bitrate alone does not establish quality. Review the codec and encoder implementation, content complexity, resolution, frame rate, and HDR or SDR configuration, then test adjustments with representative scenes.
- HLS output does not interoperate: The codec signaling, keyframes, or container may not match the HLS authoring requirements for that path. Check the applicable specification; Apple’s cited guidance calls for fMP4 with HEVC and permits fMP4 or MPEG transport stream with H.264.
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Quick Recap
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