參考資料：https://gist.github.com/XueshiQiao/c50fd1f088d431ceb1f59bd4ec40c6d7
HEVC編碼的FLV格式視訊 --> https://download.csdn.net/download/qq_36236684/13686337
Flash Video（簡稱FLV），是一種網絡視訊格式，用作串流媒體格式，它的出現有效地解決了視訊檔案導入Flash後，使導出的SWF檔案體積龐大，不能在網絡上有效使用等缺點。
HEVC是High Efficiency Video Coding的縮寫(又稱為H.265和MPEG-H第2部分)，是一種新的視訊壓縮标準，用來以替代H.264/AVC編碼标準，2013年1月26号，HEVC正式成為國際标準。
前言：
最近團隊需要編解碼FLV封裝的HEVC編碼的視訊，但是FFmpeg因為某種原因，沒有原生支援上述封裝。是以在網上搜尋之後找到了相關的解決方案，在此記錄一下。
FFMpeg版本：3.4.5
1. 修改部分，可以使用patch指令直接合到自己的項目中
需要注意的是 FLV_CODECID_HEVC = 14,可以根據實際情況更改，一般情況下國内使用的都是14，也有用12的
commit 35b84e7ff5ea2dd314eb9e14fe9698e3c3b1bb09
Author: xxx <[email protected]>
Date: Mon Dec 14 11:06:49 2020 +0800
add h265 dec & enc in flv
diff --git a/libavformat/flv.h b/libavformat/flv.h
index df5ce3d..2b025bb 100644
--- a/libavformat/flv.h
+++ b/libavformat/flv.h
@@ -109,6 +109,7 @@ enum {
FLV_CODECID_H264 = 7,
FLV_CODECID_REALH263= 8,
FLV_CODECID_MPEG4 = 9,
+ FLV_CODECID_HEVC = 14,
};
enum {
diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index 2d89bef..bc0ae18 100644
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -36,6 +36,7 @@
#include "internal.h"
#include "avio_internal.h"
#include "flv.h"
+#include "hevc.h"
#define VALIDATE_INDEX_TS_THRESH 2500
@@ -291,6 +292,8 @@ static int flv_same_video_codec(AVCodecParameters *vpar, int flags)
return vpar->codec_id == AV_CODEC_ID_VP6A;
case FLV_CODECID_H264:
return vpar->codec_id == AV_CODEC_ID_H264;
+ case FLV_CODECID_HEVC:
+ return vpar->codec_id == AV_CODEC_ID_HEVC;
default:
return vpar->codec_tag == flv_codecid;
}
@@ -340,6 +343,11 @@ static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream,
par->codec_id = AV_CODEC_ID_MPEG4;
ret = 3;
break;
+ case FLV_CODECID_HEVC:
+ par->codec_id = AV_CODEC_ID_HEVC;
+ vstream->need_parsing = AVSTREAM_PARSE_NONE;
+ ret = 3; // not 4, reading packet type will consume one byte
+ break;
default:
avpriv_request_sample(s, "Video codec (%x)", flv_codecid);
par->codec_tag = flv_codecid;
@@ -1149,10 +1157,11 @@ retry_duration:
if (st->codecpar->codec_id == AV_CODEC_ID_AAC ||
st->codecpar->codec_id == AV_CODEC_ID_H264 ||
- st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
+ st->codecpar->codec_id == AV_CODEC_ID_MPEG4 ||
+ st->codecpar->codec_id == AV_CODEC_ID_HEVC) {
int type = avio_r8(s->pb);
size--;
- if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
+ if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4 || st->codecpar->codec_id == AV_CODEC_ID_HEVC) {
// sign extension
int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;
pts = dts + cts;
@@ -1168,7 +1177,7 @@ retry_duration:
}
}
if (type == 0 && (!st->codecpar->extradata || st->codecpar->codec_id == AV_CODEC_ID_AAC ||
- st->codecpar->codec_id == AV_CODEC_ID_H264)) {
+ st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_HEVC)) {
AVDictionaryEntry *t;
if (st->codecpar->extradata) {
diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
index e966c36..3d2de1b 100644
--- a/libavformat/flvenc.c
+++ b/libavformat/flvenc.c
@@ -34,7 +34,7 @@
#include "libavutil/opt.h"
#include "libavcodec/put_bits.h"
#include "libavcodec/aacenctab.h"
-
+#include "hevc.h"
static const AVCodecTag flv_video_codec_ids[] = {
{ AV_CODEC_ID_FLV1, FLV_CODECID_H263 },
@@ -46,6 +46,7 @@ static const AVCodecTag flv_video_codec_ids[] = {
{ AV_CODEC_ID_VP6, FLV_CODECID_VP6 },
{ AV_CODEC_ID_VP6A, FLV_CODECID_VP6A },
{ AV_CODEC_ID_H264, FLV_CODECID_H264 },
+ { AV_CODEC_ID_HEVC, FLV_CODECID_HEVC },
{ AV_CODEC_ID_NONE, 0 }
};
@@ -486,7 +487,7 @@ static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par) {
FLVContext *flv = s->priv_data;
if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
- || par->codec_id == AV_CODEC_ID_MPEG4) {
+ || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC) {
int64_t pos;
avio_w8(pb,
par->codec_type == AVMEDIA_TYPE_VIDEO ?
@@ -533,7 +534,11 @@ static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par) {
avio_w8(pb, par->codec_tag | FLV_FRAME_KEY); // flags
avio_w8(pb, 0); // AVC sequence header
avio_wb24(pb, 0); // composition time
- ff_isom_write_avcc(pb, par->extradata, par->extradata_size);
+ if (par->codec_id == AV_CODEC_ID_HEVC) {
+ ff_isom_write_hvcc(pb, par->extradata, par->extradata_size, 0);
+ } else {
+ ff_isom_write_avcc(pb, par->extradata, par->extradata_size);
+ }
}
data_size = avio_tell(pb) - pos;
avio_seek(pb, -data_size - 10, SEEK_CUR);
@@ -836,7 +841,7 @@ end:
AVCodecParameters *par = s->streams[i]->codecpar;
FLVStreamContext *sc = s->streams[i]->priv_data;
if (par->codec_type == AVMEDIA_TYPE_VIDEO &&
- (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4))
+ (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC))
put_avc_eos_tag(pb, sc->last_ts);
}
}
@@ -887,13 +892,13 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A ||
par->codec_id == AV_CODEC_ID_VP6 || par->codec_id == AV_CODEC_ID_AAC)
flags_size = 2;
- else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4)
+ else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC)
flags_size = 5;
else
flags_size = 1;
if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
- || par->codec_id == AV_CODEC_ID_MPEG4) {
+ || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC) {
int side_size = 0;
uint8_t *side = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &side_size);
if (side && side_size > 0 && (side_size != par->extradata_size || memcmp(side, par->extradata, side_size))) {
@@ -956,6 +961,10 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
if (par->extradata_size > 0 && *(uint8_t*)par->extradata != 1)
if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
return ret;
+ } else if (par->codec_id == AV_CODEC_ID_HEVC) {
+ if (par->extradata_size > 0 && *(uint8_t*)par->extradata != 1)
+ if ((ret = ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL)) < 0)
+ return ret;
} else if (par->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
(AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
if (!s->streams[pkt->stream_index]->nb_frames) {
@@ -1028,7 +1037,7 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
(FFALIGN(par->height, 16) - par->height));
} else if (par->codec_id == AV_CODEC_ID_AAC)
avio_w8(pb, 1); // AAC raw
- else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
+ else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC) {
avio_w8(pb, 1); // AVC NALU
avio_wb24(pb, pkt->pts - pkt->dts);
}
2. 編譯：
./configure --prefix=/usr/local --enable-libx265 --enable-gpl --enable-ffplay
make
make install
3. 轉碼為h265：
-i 為輸入，-acodec 為音頻編碼，-vcodec為視訊編碼
ffmpeg -y -i xxx.mp4 -acodec copy -vcodec libx265 xxx.flv
4. 播放
ffplay xxx.flv
![FFmpeg視訊解碼為YUV像素資料檔案[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)