具有多个PPS和SPS的H264 [英] H264 with multiple PPS and SPS

问题描述

我有一张卡，它直接在每个I帧之前按顺序生成带有SPS(序列参数集)和PPS(图像参数集)的H264流.我看到大多数H264流在第一个I帧中都包含PPS和SPS.

I have a card that produces a H264 stream with a SPS (Sequence Parameter Set) and a PPS (Picture Parameter Set), in that order, directly before each I-Frame. I see that most H264 streams contain a PPS and SPS at the first I-Frame.

这是推荐的吗?解码器/复用器通常是否支持多个PPS和SRS?

Is this recommended? Do decoders/muxers typically support multiple PPS and SRS?

推荐答案

H.264具有多种流格式.一种变体称为附件B".

H.264 comes in a variety of stream formats. One variation is called "Annex B".

(AUD)(SPS)(PPS)(I-Slice)(PPS)(P-Slice)(PPS)(P-Slice)...(AUD)(SPS)(PPS)(I-Slice)

(AUD)(SPS)(PPS)(I-Slice)(PPS)(P-Slice)(PPS)(P-Slice) ... (AUD)(SPS)(PPS)(I-Slice).

通常，您在每个I帧之前看到SPS/PPS，在其他切片之前看到PPS.

Typically you see SPS/PPS before each I frame and PPS before other slices.

大多数解码器/混合器都对附件B"和SPS/PPS的重复感到满意.

Most decoders/muxers are happy with "Annex B" and the repetition of SPS/PPS.

如果更改中间格式和SPS/PPS，大多数解码器/混合器将无济于事.

Most decoders/muxers won't do anything meaningful if you change the format and SPS/PPS midstream.

大多数解码器/复用器在设置过程中会解析第一个SPS/PPS，而忽略后续的SPS.

Most decoders/muxers parse the first SPS/PPS as part of a setup process and ignore subsequent SPSs.

某些解码器/复用器更喜欢没有(AUD)，起始代码和SPS/PPS的H.264. 然后，在设置解码器/复用器的过程中，必须带外馈送SPS/PPS.

Some decoders/muxers prefer H.264 without the (AUD), start codes and SPS/PPS. Then you have to feed SPS/PPS out of band as part of setting up the decoders/muxers.

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