ffmpeg command line option makeup - 02

最新推荐文章于 2022-08-23 11:48:00 发布

fanbird2008

最新推荐文章于 2022-08-23 11:48:00 发布

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分类专栏： Stream Media/FFMPEG 文章标签： ffmpeg

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本文详细介绍使用FFmpeg进行音视频处理的各种实用案例，包括文件流处理、原始视频处理及网络流传输等，并深入探讨了如何配置不同类型的过滤器图表以实现复杂的音视频处理任务。

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ffmpeg -f mpegts -stream_loop -1 -re -i war.ts -c:v libx264 -s 1280x720 -b:v 1000k -c:a libfdk_aac -ar 48000 -f flv rtmp://localhost/hls/333333

ffmpeg -i war.ts -f mpegts -an -c:v rawvideo -pix_fmt yuyv422 ff422.yuv

ffmpeg -i input.mov -c:v libx264 -vf 'yadif,format=pix_fmts=yuv420p'
access.mp4

1. c:v c:a -- specifiy codec for video audio

-c:v mpeg4

-c:a libmp3lame

2. b:v b:a -- specify bitrate for video audio

-b:v 800k

-b:a 128k

3. f -- specify format for video

-f avi

4. s -- specify frame size for video

aspect -- specify video display aspect ratio

-s 720x480

-aspect 4:3

5. r -- specifiy fps for video

-r 25

6. map

The first -map option on the command line specifies the source for output stream 0, the second -map option specifies the source for output stream 1, etc.

6.1 ffmpeg -i input.avi -map 0 output.h264

to map ALL streams from the first input file to output

6.2For example, if you have two audio streams in the first input file, these streams are identified by "0:0"

and "0:1". You can use -map to select which streams to place in an output file. For example:

ffmpeg -i input.avi -map 0:1 output.wav

to map the input stream in ‘input.avi’ identified by "0:1" to the (single) output stream in ‘output.wav’.

6.3 For example, to select the stream with index 2 from input file ‘a.mov’

(specified by the identifier "0:2"), and stream with index 6 from input ‘b.mov’

(specified by the identifier "1:6"), and copy them to the output file ‘out.mov’:

ffmpeg -i a.mov -i b.mov -c copy -map 0:2 -map 1:6 out.mov

6.4 To select all video and the third audio stream from an input file

ffmpeg -i input.avi -map 0:v -map 0:a:2 output.h264

6.5 To map all the streams except the second audio, use negative mappings

ffmpeg -i input.avi -map 0 -map -0:a:1 output.h264

You can disable some of those video audio or subtitle stream by using -vn/-an/-sn options. For full manual control, use the -map option.

7. q and qscale

8. filtering

Before encoding, ffmpeg can process raw audio and video frames using filters from the libavfilter library. Several chained filters form a filter graph. ffmpeg distinguishes between two types of filtergraphs - simple and complex.

8.1 simple filtergraphs

Simple filtergraphs are those that have exactly one input and output, both of the same type. In the above diagram they can be represented by simply inserting an additional step between decoding and encoding:

 _________                        __________              ______________
|         |                      |          |            |              |
| decoded |  simple filtergraph  | filtered |  encoder   | encoded data |
| frames  | -------------------> | frames   | ---------> | packets      |
|_________|                      |__________|            |______________|

Simple filtergraphs are configured with the per-stream ‘-filter’ option (with ‘-vf’ and ‘-af’ aliases for video and audio respectively). A simple filtergraph for video can look for example like this:

 _______        _____________        _______        _____        ________
|       |      |             |      |       |      |     |      |        |
| input | ---> | deinterlace | ---> | scale | ---> | fps | ---> | output |
|_______|      |_____________|      |_______|      |_____|      |________|

8.2 complex filtergraphs

9. some examples

9.1 file streaming

ffmpeg -f mpegts -i film.v -an -c:v libx264 -f h264 film.h264

ffmpeg -f mpegts -i film.v -an -c:v libx264 -s 720x480 -aspect 4:3 -b:v(-vb) 1024k -f h264 film1.h264

ffmpeg -f mpegts -i film.v -f s16le -c:a pcm_s16le film.wav

ffmpeg -f mpegts -i fm352.ts -vn -ac 1 -f s16le -c:a pcm_s16le fm1.wav

ffmpeg -f s16le -i fm_01.wav -vn -c:a libfaac -ac 1 -ar 48000 -b:a 128k -f mp4 fm_aac_01.mp4

--enable-libx264 \
--enable-encoder=rawvideo \
--enable-decoder=rawvideo \
--enable-encoder=libx264 \
--enable-decoder=h264 \
--enable-encoder=mp3 \
--enable-decoder=mp3 \
--enable-encoder=pcm_s16le \
--enable-decoder=pcm_s16le \
--enable-encoder=aac \
--enable-decoder=aac \
--disable-muxers \
--enable-muxer=mpegts \
--enable-muxer=h264 \
--enable-muxer=aac \
--enable-muxer=pcm_s16le \
--disable-demuxers \
--enable-demuxer=mpegts \
--enable-demuxer=aac \
--enable-demuxer=pcm_s16le \

ffmpeg -f mpegts -i film.v -f s16le -c:a pcm_s16le film.wav

ffmpeg -f mpegts -i fm352.ts -vn -ac 1 -f s16le -c:a pcm_s16le fm1.wav

ffmpeg -f rawvideo -s 768x432 -i cap.yuv -an -c:v libx264 -f h264 cap.h264

ffmpeg -f mpegts -i film.v -c:a libfaac -ac 1 -c:v libx264 -s 720x480 -aspect 4:3 -b:v 512k -r 16 -f mpegts fm.ts

ffmpeg -i input -c:v libx264 -preset slow -crf 22 -x264opts keyint=123:min-keyint=20 -c:a copy output.mkv

ffmpeg -f mpegts -i film.v -c:a libfaac -c:v libx264 -s 352x288 -b:v 200k -f 3gp Battle1.3gp

ffmpeg -f mpegts -i film352.ts -c:a libopencore_amrnb -ar 8000 -ac 1 -c:v libx264 -s qcif -f 3gp Battle2.3gp

Notes: amrnb only support single channel, therefore the option -ac 1 is a must.

9.2 rawvideo

ffmpeg -i test3.264 -s 352x288 -pix_fmt yuv420p test31.yuv

ffmpeg -s 352x288 -i /.live_stream_fifo -pix_fmt yuv420p -vcodec rawvideo -s 176x144 test31.yuv

9.3 network streaming

ffmpeg -i rtsp://192.168.0.158:8000/sample_h264_300kbit.mp4 -c:a libfaac -c:v libx264 -f mpegts sample.ts

ffmpeg -i rtsp://admin:admin@192.168.0.109:554/mpeg4cif -c:v rawvideo -s 352x255 -f rawvideo 111.yuv

./ffmpeg -re -f mpegts -i film.v -c:a libfaac -ac 1 -c:v libx264 -s 352x288 -aspect 4:3 -b:a 100k -b:v 200k -preset fast -f flv 'rtmp://192.168.0.158/live/sss1'

./ffmpeg -re -f mpegts -i film.v -c:a libfaac -ac 1 -c:v libx264 -s 352x288 -aspect 4:3 -b:a 100k -b:v 200k -preset fast -f flv 'rtmp://192.168.0.158/live/sss1 live=1'

./ffmpeg -re -f mpegts -i film.v -c:a libfaac -ac 1 -c:v libx264 -s 352x288 -aspect 4:3 -b:a 100k -b:v 200k -preset fast -f flv 'rtmp://192.168.0.158/live/sss1.flv'

./ffmpeg -re -f mpegts -i film.v -c:a libfaac -ac 1 -c:v libx264 -s 352x288 -aspect 4:3 -b:a 100k -b:v 200k -preset fast -f flv 'rtmp://192.168.0.158/live/sss1.flv live=1'

ffmpeg -re -i 'rtmp://192.168.137.66/live/sss1 live=1' -an -c:v rawvideo -s 352x288 -f rawvideo tt.yuv

ffmpeg -f mpegts -i ../film.v -an -c:v libx264 -s 720x480 -b:v 1000k -flags +global_header -f rtp rtp://192.168.0.58:55002 -vn -c:a libfaac -b:a 128k -flags +global_header-f rtp rtp://192.168.0.58:55004 >111.sdp

ffmpeg -i ./film1.ts -f mpegts -vn -c:a libfaac -ac 1 -f adts fm.aac.adts

ffmpeg -i ./film1.ts -f mpegts -vn -c:a ac3 -ac 1 -f adts fm.ac3.adts

ffmpeg -i ./film1.ts -f mpegts -vn -c:a g722 -ac 1 -f rtp rtp://224.135.6.17:5556

ffmpeg -re -i ./film1.ts -f mpegts -vn -c:a g722 -ac 1 -f rtp rtp://224.135.6.17:50056 >test.sdp

v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
t=0 0
a=tool:libavformat 55.48.100
m=video 55002 RTP/AVP 96
c=IN IP4 224.235.6.17
b=AS:1000
a=rtpmap:96 H264/90000
a=fmtp:96 packetization-mode=1; sprop-parameter-sets=Z2QAHqzZQLQ9v/AC8AHhAAADA+kAALuADxYtlg==,aOvssiw=; profile-level-id=64001E
m=audio 55004 RTP/AVP 97
c=IN IP4 224.235.6.17
b=AS:128
a=rtpmap:97 MPEG4-GENERIC/48000/2
a=fmtp:97 profile-level-id=1;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3; config=1190

ffmpeg -f mpegts -re -i ./film1.ts -an -c:v libx264 -s 720x480 -b:v 1000k -flags +global_header -f rtp rtp://192.168.1.149:55002 >111.sdp

v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 192.168.1.149
t=0 0
a=tool:libavformat 55.48.100
m=video 55002 RTP/AVP 96
b=AS:1000
a=rtpmap:96 H264/90000
a=fmtp:96 packetization-mode=1; sprop-parameter-sets=Z2QAHqzZQLQ9v/AC8AHhAAADA+kAALuADxYtlg==,aOvssiw=; profile-level-id=64001E

在 192.168.1.149 PC 机上，用VLC打开111.sdp, VLC 将能播放rtp视频流。

ffmpeg -f mpegts -re -i ./film1.ts -an -c:v libx264 -s 720x480 -b:v 512k -flags +global_header -f rtp rtp://192.168.1.149:55002 -vn -c:a libfaac -b:a 32k -flags +global_header -f rtp rtp://192.168.1.149:55004 >111.sdp

v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
t=0 0
a=tool:libavformat 55.48.100
m=video 55002 RTP/AVP 96
c=IN IP4 192.168.1.149
b=AS:512
a=rtpmap:96 H264/90000
a=fmtp:96 packetization-mode=1; sprop-parameter-sets=Z2QAHqzZQLQ9v/AC8AHhAAADA+kAALuADxYtlg==,aOvssiw=; profile-level-id=64001E
m=audio 55004 RTP/AVP 97
c=IN IP4 192.168.1.149
b=AS:32
a=rtpmap:97 MPEG4-GENERIC/48000/2
a=fmtp:97 profile-level-id=1;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3; config=1190

在 192.168.1.149 PC 机上，用VLC打开111.sdp, VLC 将能播放rtp音视频流。

====================================================================================

ffmpeg -f mpegts -re -i ./film1.ts -an -c:v libx264 -s 720x480 -b:v 512k -flags +global_header -f rtp rtp://192.168.1.149:55002 -vn -c:a adpcm_g722 -ac 1 -flags +global_header -f rtp rtp://192.168.1.149:55004 >111.sdp

v=0^M
o=- 0 0 IN IP4 127.0.0.1^M
s=No Name^M
t=0 0^M
a=tool:libavformat 55.48.100^M
m=video 55002 RTP/AVP 96^M
c=IN IP4 192.168.1.149^M
b=AS:512^M
a=rtpmap:96 H264/90000^M
a=fmtp:96 packetization-mode=1; sprop-parameter-sets=Z2QAHqzZQLQ9v/AC8AHhAAADA+kAALuADxYtlg==,aOvssiw=; profile-level-id=64001E^M
m=audio 55004 RTP/AVP 97^M
c=IN IP4 192.168.1.149^M
b=AS:128^M
a=rtpmap:97 G722/8000/1^M

ffmpeg -f mpegts -i ./film1.ts -an -c:v rawvideo -s 720x480 -pix_fmt yuv420p -f rawvideo fm.yuv

ffmpeg -i ./film1.ts -f mpegts -c:a libfaac -b:a 512k -ac 2 -ar 48000 -c:v libx264 -b:v 1536k -f mpegts ff.ts

./x264 --input-res 1280x720 --input-csp i420 --bitrate 1536 --fps 30 --profile high --level 52 -o fm720.h264 fm720p.yuv

1. AVIOContext

(AVIOContext *)->(URLContext *)opaque->(FileContext *)priv_data

2. AVFormatContext

(AVFormatContext *)->(MpegTSContext *)priv_data

(MpegTSFilter *)->(MpegTSContext *)u.section_filter.opaque