我正在使用 HM 12.1 参考代码。我必须从编码的 h.265 位流中找到以字节或 KB 为单位的帧大小。我对视频处理很陌生,我陷入了困境。请帮忙!
问问题
4495 次
2 回答
8
如果您使用最新版本的ffmpeg,则非常简单:
ffprobe -show_frames file.hevc
寻找以pkt_size
例子:
$ ~/src/ffmpeg/ffprobe -show_frames BQMall_832x480_60_QP22.hevc | grep pkt_size
pkt_size=67941
pkt_size=12235
pkt_size=13024
pkt_size=13026
pkt_size=12534
pkt_size=13778
pkt_size=13589
pkt_size=13039
pkt_size=12035
pkt_size=12582
pkt_size=13186
pkt_size=15519
pkt_size=15930
pkt_size=15616
pkt_size=15311
pkt_size=15430
pkt_size=14608
pkt_size=14423
pkt_size=16044
pkt_size=18246
ffprobe
非常酷,与 gnuplot 一起,您可以生成漂亮的帧大小图,例如:
目前它不适用于 HEVC,因为 ffprope 无法检测到正确的 slize-types 但希望在未来得到修复
执行上述操作的代码是:
#!/bin/bash
# If not in path
FFPROBE=/home/xxxx/src/ffmpeg/ffprobe
# If in path
#FFPROBE=ffprobe
cat <<EOF > /tmp/plot.txt
# GNUPLOT "plot.txt"
#Use the 3 lines below to store plot to file
#set terminal png size 1280,720
#set term png
#set output "bitrate.png"
set title "$(basename $1)"
set ylabel "Bytes per frame"
set xrange [-2:*]
set lmargin 12
set rmargin 2
set grid
set pointsize 2
set label 1 "I frames"
set label 1 at graph .85, .96 tc lt 1
set label 2 "P frames"
set label 2 at graph .85, .92 tc lt 2
set label 3 "B frames"
set label 3 at graph .85, .88 tc lt 3
plot '/tmp/column.dat' using 3:1:2 notitle with i lc rgb variable
EOF
awk '
BEGIN{
FS="="
OFS="\t"
fnum=0
}
/pkt_size/ {size=$2}
/pict_type/{
sub(/I/, "167116800", $2)
sub(/P/, "65280", $2)
sub(/B/, "255", $2)
sub(/\?/, "65280", $2)
type=$2
}
/coded_picture_number/{
# sub(/0/, fnum, $2)
num=$2
# fnum=fnum+1
print size, type, num
}' <(${FFPROBE} -show_frames $1 2>/dev/null) > /tmp/column.dat
gnuplot -persist /tmp/plot.txt
更新
JCT-VC 的好人已经考虑过这一点,并且在参考软件中,你会得到一个名为的二进制文件annexBbytecountStatic
,它几乎可以做到这一点。只需使用原始 hevc-bitstream 作为唯一参数来调用它。使用与上面相同的文件作为示例:
$ ./annexBbytecountStaticd BQMall_832x480_60_QP22.hevc | grep NumBytesInNALunit
NumBytesInNALunit: 25
NumBytesInNALunit: 31
NumBytesInNALunit: 10
NumBytesInNALunit: 67858
NumBytesInNALunit: 12231
NumBytesInNALunit: 13020
NumBytesInNALunit: 13022
NumBytesInNALunit: 12530
NumBytesInNALunit: 13774
NumBytesInNALunit: 13585
NumBytesInNALunit: 13035
NumBytesInNALunit: 12031
NumBytesInNALunit: 12578
NumBytesInNALunit: 13182
NumBytesInNALunit: 15515
NumBytesInNALunit: 15926
NumBytesInNALunit: 15612
NumBytesInNALunit: 15307
NumBytesInNALunit: 15426
NumBytesInNALunit: 14604
NumBytesInNALunit: 14419
NumBytesInNALunit: 16040
NumBytesInNALunit: 18243
NumBytesInNALunit: 338004
NumBytesInNALunit: 270121
NumBytesInNALunit: 0
NumBytesInNALunit: 67883
于 2014-02-21T23:01:38.703 回答
0
请注意:
ffprobe -show_frames file.hevc | grep pkt_size
如果您需要存储顺序使用,命令会按显示顺序返回帧:
ffprobe -show_packets file.hevc | grep size
于 2020-04-16T18:38:30.230 回答