ffmpeg使用说明(3)：ffmpeg音视频格式转换，裁剪，合并
格式转换
封装格式
- 保持音频编码
ffmpeg -i cctv1.mp4 -codec copy cctv1.ts
$ ffmpeg -i cctv1.mp4 -codec copy cctv1.ts
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cctv1.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 00:00:23.72, start: 0.000000, bitrate: 2154 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 2088 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 78 kb/s (default)
Metadata:
handler_name : SoundHandler
Output #0, mpegts, to 'cctv1.ts':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, q=2-31, 2088 kb/s, 25 fps, 25 tbr, 90k tbn, 12800 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 78 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
编码格式
- 改变音频编码
ffmpeg -i cctv1.flv -acodec aac cctv1.mp4
$ ffmpeg -i cctv1.flv -acodec aac cctv1.mp4
Input #0, flv, from 'cctv1.flv':
Metadata:
encoder : Lavf58.20.100
Duration: 00:00:23.69, start: 0.000000, bitrate: 1793 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
Stream #0:1: Video: flv1, yuv420p, 1920x1080, 200 kb/s, 25 fps, 25 tbr, 1k tbn
Stream mapping:
Stream #0:1 -> #0:0 (flv1 (flv) -> h264 (libx264))
Stream #0:0 -> #0:1 (mp3 (mp3float) -> aac (native))
Output #0, mp4, to 'cctv1.mp4':
Metadata:
encoder : Lavf58.29.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080, q=-1--1, 25 fps, 12800 tbn, 25 tbc
Metadata:
encoder : Lavc58.54.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc58.54.100 aac
- 改变视频格式
ffmpeg -i cctv1.flv -vcodec h264 cctv1.mp4
$ ffmpeg -i cctv1.flv -vcodec h264 cctv1.mp4
Input #0, flv, from 'cctv1.flv':
Metadata:
encoder : Lavf58.20.100
Duration: 00:00:23.69, start: 0.000000, bitrate: 1793 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
Stream #0:1: Video: flv1, yuv420p, 1920x1080, 200 kb/s, 25 fps, 25 tbr, 1k tbn
Stream mapping:
Stream #0:1 -> #0:0 (flv1 (flv) -> h264 (libx264))
Stream #0:0 -> #0:1 (mp3 (mp3float) -> aac (native))
Output #0, mp4, to 'cctv1.mp4':
Metadata:
encoder : Lavf58.29.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080, q=-1--1, 25 fps, 12800 tbn, 25 tbc
Metadata:
encoder : Lavc58.54.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc58.54.100 aac
- 音频编码和视频编码全部变更
ffmpeg -i cctv1.flv -acodec aac -vcodec h264 cctv1.mp4
$ ffmpeg -i cctv1.flv -acodec aac -vcodec h264 cctv1.mp4
Input #0, flv, from 'cctv1.flv':
Metadata:
encoder : Lavf58.20.100
Duration: 00:00:23.69, start: 0.000000, bitrate: 1793 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
Stream #0:1: Video: flv1, yuv420p, 1920x1080, 200 kb/s, 25 fps, 25 tbr, 1k tbn
Stream mapping:
Stream #0:1 -> #0:0 (flv1 (flv) -> h264 (libx264))
Stream #0:0 -> #0:1 (mp3 (mp3float) -> aac (native))
Output #0, mp4, to 'cctv1.mp4':
Metadata:
encoder : Lavf58.29.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080, q=-1--1, 25 fps, 12800 tbn, 25 tbc
Metadata:
encoder : Lavc58.54.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc58.54.100 aac
帧率
ffmpeg -i cctv1.mp4 -r 15 cctv1_15fps.mp4
$ ffmpeg -i cctv1.mp4 -r 15 cctv1_15fps.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cctv1.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 00:00:23.72, start: 0.000000, bitrate: 2154 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 2088 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 78 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Output #0, mp4, to 'cctv1_15fps.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080, q=-1--1, 15 fps, 15360 tbn, 15 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.54.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
encoder : Lavc58.54.100 aac
码率: -b:v 视频码率， -b:a 音频码率
ffmpeg -i cctv1.mp4 -b:v 400k -b:a 100k cctv1_15fps.mp4
$ ffmpeg -i cctv1.mp4 -b:v 400k -b:a 100k cctv1_15fps.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cctv1.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 00:00:23.72, start: 0.000000, bitrate: 2154 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 2088 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 78 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Output #0, mp4, to 'cctv1_15fps.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080, q=-1--1, 400 kb/s, 25 fps, 12800 tbn, 25 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.54.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/400000 buffer size: 0 vbv_delay: -1
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 100 kb/s (default)
Metadata:
handler_name : SoundHandler
encoder : Lavc58.54.100 aac
视频分辨率
ffmpeg -i cctv1.mp4 -s 1280x720 cctv1_1280x720.mp4
$ ffmpeg -i cctv1.mp4 -s 1280x720 cctv1_1280x720.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cctv1.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 00:00:23.72, start: 0.000000, bitrate: 2154 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 2088 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 78 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Output #0, mp4, to 'cctv1_1280x720.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720, q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.54.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
encoder : Lavc58.54.100 aac
音频采样率
$ ffmpeg -i cctv1.mp4 -ar 44100 cctv1_44100.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cctv1.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 00:00:23.72, start: 0.000000, bitrate: 2154 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 2088 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 78 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Output #0, mp4, to 'cctv1_44100.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080, q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.54.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
encoder : Lavc58.54.100 aac
裁剪
ffmpeg -i cctv1.mp4 -ss 5 -t 3 -codec copy 1.mp4
- -ss 裁剪开始时刻
- -t 裁剪时长(s)
$ ffmpeg -i cctv1.mp4 -ss 5 -t 3 -codec copy 1.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cctv1.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 00:00:23.72, start: 0.000000, bitrate: 2154 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 2088 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 78 kb/s (default)
Metadata:
handler_name : SoundHandler
Output #0, mp4, to '1.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, q=2-31, 2088 kb/s, 25 fps, 25 tbr, 12800 tbn, 12800 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 78 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
frame= 0 fps=0.0 q=-1.0 Lsize= 48kB time=00:00:02.97 bitrate= 132.5kbits/s speed=1.08e+03x
合并
-
编写concat文件
file '1.mp4' file '2.mp4' -
ffmpeg -f concat -i filelist.txt -codec copy output.mp4
$ ffmpeg -f concat -i filelist.txt -codec copy output.mp4
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x559349f6e500] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from 'filelist.txt':
Duration: N/A, start: -0.021333, bitrate: 3796 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 3668 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s
Metadata:
handler_name : SoundHandler
Output #0, mp4, to 'output.mp4':
Metadata:
encoder : Lavf58.29.100
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, q=2-31, 3668 kb/s, 25 fps, 25 tbr, 12800 tbn, 12800 tbc
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x559349f7f080] Auto-inserting h264_mp4toannexb bitstream filter
frame= 150 fps=0.0 q=-1.0 Lsize= 2646kB time=00:00:06.04 bitrate=3588.7kbits/s speed= 267x
video:2548kB audio:93kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.191427%
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 00:00:03.02, start: 0.000000, bitrate: 3778 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 3668 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 00:00:03.00, start: 0.000000, bitrate: 3422 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 3287 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 00:00:06.06, start: 0.000000, bitrate: 3575 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 3465 kb/s, 24.91 fps, 50 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 126 kb/s (default)
Metadata:
handler_name : SoundHandler
本文来自博客园，作者：flxx，转载请注明原文链接：https://www.cnblogs.com/faithlocus/p/15559269.html
