学向勤中得，萤窗万卷书。这篇文章主要讲述Android 音视频深入 二十FFmpeg视频压缩相关的知识，希望能为你提供帮助。
项目源码
https://github.com/979451341/FFmpegCompress

这个视频压缩是通过类似在mac终端上输入FFmpeg命令来完成，意思是我们需要在android上达到能够执行FFmpeg命令。其实做到这一点还比较容易，这一次重在说说这压缩过程，不是看代码运行过程，通过log来观察代码运行的结果。

1.首先普及一下相关专业名词

视频尺寸：指的就是视频的分辨率，常见的分辨率有4096*2304,1920*1080,720*576等。视频编码：视频编码方式就是指通过特定的压缩技术，将某个视频格式的文件转换成另一种视频格式文件的方式。视频编码格式常见到的有：MPEG-2 TS、Divx、Xvid、H.264、WMV-HD和VC-1。音频编码：音频编码方式指通过特定的压缩技术对音频数据进行处理的方法。帧率：帧率（即视频更新率）是用于测量显示帧数的量度。测量单位为“每秒显示帧数”（Frame Per Second，FPS，帧率）或“赫兹”，单位用FPS用来描述视频每秒播放多少帧，而单位用赫兹用来描述显示器的画面每秒更新多少次。 一般帧率越高，视频画面越流畅。比特率：指每秒传送的比特(bit)数，即每秒传输的文件大小。比特率规定使用“比特每秒”（bit/s 或 bps）为单位。比特率越高，每秒传送的数据越大。采样率：采样率的单位是Hz，表示每秒采样的次数。单位时间内取样率越大，精度就越高，处理过的视频文件就越接近没有处理过的视频文件。码率：码率就是数据传输时单位时间传送的数据位数,一般我们用的单位是kbps即千位每秒。码率与体积成正比：码率越大，体积越大；码率越小，体积越小。由于文件体积与取样率是成正比的，所以几乎所有的编码格式都想用最低的码率达到最少的失真，“码率”就是失真度，码率越高越清晰，反之则画面粗糙而且马赛克多。视频部分的位深度：用于指定图像中的每个像素可以使用的颜色信息数量，用“位即bit”为单位。音频部分的位深度：单个声道的采样数据大小

2.执行FFmpeg的压缩命令
首先执行这个FFmpeg命令是在FFmpeg源码fftools文件夹下的ffmpeg.c的main函数来完成的,所以我们只用把命令传入这个main函数就可以了，然后需要注意的是他中途出现错误会使用exit_program(int)这个函数，如果我们直接使用main函数，调用了这个函数程序会直接被结束，所以我们需要在JNI层开启子线程来执行main函数。
然后就是在Android里运行这个main函数需要一些其他的在fftools文件夹下的文件才能编译成功，这里大家使用我的项目源码就可以了
现在需要在java层准备压缩命令了

int ret = FFmpegNativeBridge.runCommand(new String[]{"ffmpeg", "-i", et_input.getText().toString(), "-y", "-c:v", "libx264", "-c:a", "aac", "-vf", "scale=-2:640", "-preset", "ultrafast", "-b:v", "450k", "-b:a", "96k", et_output.getText().toString()});

说一下这个命令的含义，不过这个时候我们看看log里说了啥
开始分割命令行
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Splitting the commandline.
读取输入文件url
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Reading option ‘-i‘ ...
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG:matched as input url with argument ‘/storage/emulated/0/pauseRecordDemo/video/video.mp4‘.
当已存在输出路径文件，不提示是否覆盖。
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Reading option ‘-y‘ ...
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG:matched as option ‘y‘ (overwrite output files) with argument ‘1‘.
设置视频编码器
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Reading option ‘-c:v‘ ...
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG:matched as option ‘c‘ (codec name) with argument ‘libx264‘.
设置音频编码器
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Reading option ‘-c:a‘ ...
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG:matched as option ‘c‘ (codec name) with argument ‘aac‘.
设置输出视频尺寸
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Reading option ‘-vf‘ ...
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG:matched as option ‘vf‘ (set video filters) with argument ‘scale=-2:640‘.
配置AVOption转码速率为快速
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Reading option ‘-preset‘ ...
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG:matched as AVOption ‘preset‘ with argument ‘ultrafast‘.
配置视频码率为450k
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Reading option ‘-b:v‘ ...
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG:matched as option ‘b‘ (video bitrate (please use -b:v)) with argument ‘450k‘.
配置音频码率为96k
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Reading option ‘-b:a‘ ...
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG:matched as option ‘b‘ (video bitrate (please use -b:v)) with argument ‘96k‘.
读取输出文件路径
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Reading option ‘/storage/emulated/0/pauseRecordDemo/video/compress4.mp4‘ ...
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG:matched as output url.
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Finished splitting the commandline.
开始解析命令，并打开被压缩的文件
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Parsing a group of options: global .
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Applying option y (overwrite output files) with argument 1.
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Successfully parsed a group of options.
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Parsing a group of options: input url /storage/emulated/0/pauseRecordDemo/video/video.mp4.
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Successfully parsed a group of options.
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Opening an input file: /storage/emulated/0/pauseRecordDemo/video/video.mp4.
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Opening ‘/storage/emulated/0/pauseRecordDemo/video/video.mp4‘ for reading
03-10 10:35:29.541 30750-30822/org.voiddog.ffmpeg D/TAG: Setting default whitelist ‘file,crypto‘
03-10 10:35:29.542 30750-30822/org.voiddog.ffmpeg D/TAG: Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
03-10 10:35:29.542 30750-30822/org.voiddog.ffmpeg D/TAG: ISO: File Type Major Brand: mp42
03-10 10:35:29.542 30750-30822/org.voiddog.ffmpeg D/TAG: Unknown dref type 0x206c7275 size 12
stts和ctts是 MOVStreamContext 结构体的成员变量，MOVStreamContext结构用于保存从mov或mp4中进行拆包解复用从头部得到的信息。我也不太懂
03-10 10:35:29.568 30750-30822/org.voiddog.ffmpeg D/TAG: stts: 2668915 ctts: 18769, ctts_index: 649, ctts_count: 699
03-10 10:35:29.568 30750-30822/org.voiddog.ffmpeg D/TAG: stts: 2672669 ctts: 7508, ctts_index: 650, ctts_count: 699
03-10 10:35:29.568 30750-30822/org.voiddog.ffmpeg D/TAG: stts: 2676423 ctts: 0, ctts_index: 651, ctts_count: 699
03-10 10:35:29.568 30750-30822/org.voiddog.ffmpeg D/TAG: stts: 2680177 ctts: 3753, ctts_index: 652, ctts_count: 699
03-10 10:35:29.568 30750-30822/org.voiddog.ffmpeg D/TAG: stts: 2683930 ctts: 18769, ctts_index: 653, ctts_count: 699
获得输入视频帧率
03-10 10:35:29.570 30750-30822/org.voiddog.ffmpeg D/TAG: rfps: 23.976024 0.000000
03-10 10:35:29.570 30750-30822/org.voiddog.ffmpeg D/TAG: rfps: 23.976024 0.000000
03-10 10:35:29.570 30750-30822/org.voiddog.ffmpeg D/TAG: rfps: 47.952048 0.000000
03-10 10:35:29.570 30750-30822/org.voiddog.ffmpeg D/TAG: rfps: 47.952048 0.000000
03-10 10:35:29.571 30750-30822/org.voiddog.ffmpeg D/TAG: Before avformat_find_stream_info() pos: 7467210 bytes read:60806 seeks:1 nb_streams:2
获取输入视频的信息，比如尺寸、播放位置等。
03-10 10:35:29.678 30750-30822/org.voiddog.ffmpeg D/TAG: Parsing MediaFormat {image-data=https://www.songbingjia.com/android/java.nio.HeapByteBuffer[pos=0 lim=104 cap=104], mime=video/raw, crop-top=0, crop-right=1279, slice-height=720, color-format=21, height=720, width=1280, crop-bottom=719, crop-left=0, stride=1280}
03-10 10:35:29.678 30750-30822/org.voiddog.ffmpeg I/TAG: Output crop parameters top=0 bottom=719 left=0 right=1279, resulting dimensions width=1280 height=720
03-10 10:35:29.678 30750-30822/org.voiddog.ffmpeg D/TAG: MediaCodec 0xe4732080 started successfully
03-10 10:35:29.678 30750-30822/org.voiddog.ffmpeg I/TAG: MediaCodec started successfully, ret = 0
获取输入视频文件的信息，知道了输入文件的格式、码率、时长、比特率等
03-10 10:35:29.706 30750-30822/org.voiddog.ffmpeg D/TAG: After avformat_find_stream_info() pos: 1343 bytes read:93574 seeks:2 frames:4
03-10 10:35:29.706 30750-30822/org.voiddog.ffmpeg I/TAG: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ‘/storage/emulated/0/pauseRecordDemo/video/video.mp4‘:
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:Metadata:
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:major_brand:
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: mp42
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:minor_version:
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: 512
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:compatible_brands:
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: isomiso2avc1mp41
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:encoder:
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: HandBrake 0.10.0 2014112200
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:Duration:
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: 00:00:31.81
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: , start:
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: 0.083000
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: , bitrate:
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: 1878 kb/s
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:Stream #0:0
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: (und)
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg D/TAG: , 3, 1/90000
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: : Video: h264 (avc1 / 0x31637661), nv12, 1280x720, 1728 kb/s
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: ,
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: 23.98 fps,
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: 23.98 tbr,
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: 90k tbn,
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: 90k tbc
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:(default)
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:Metadata:
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:handler_name:
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: VideoHandler
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:Stream #0:1
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: (und)
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg D/TAG: , 1, 1/48000
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: : Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 146 kb/s
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:(default)
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:Metadata:
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG:handler_name:
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg I/TAG: Stereo
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg D/TAG: Successfully opened the file.
创建并配置输出视频文件
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg D/TAG: Parsing a group of options: output url /storage/emulated/0/pauseRecordDemo/video/compress4.mp4.
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg D/TAG: Applying option c:v (codec name) with argument libx264.
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg D/TAG: Applying option c:a (codec name) with argument aac.
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg D/TAG: Applying option vf (set video filters) with argument scale=-2:640.
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg D/TAG: Applying option b:v (video bitrate (please use -b:v)) with argument 450k.
03-10 10:35:29.707 30750-30822/org.voiddog.ffmpeg D/TAG: Applying option b:a (video bitrate (please use -b:v)) with argument 96k.
03-10 10:35:29.708 30750-30822/org.voiddog.ffmpeg D/TAG: Successfully parsed a group of options.
03-10 10:35:29.708 30750-30822/org.voiddog.ffmpeg D/TAG: Opening an output file: /storage/emulated/0/pauseRecordDemo/video/compress4.mp4.
03-10 10:35:29.710 30750-30822/org.voiddog.ffmpeg D/TAG: Setting default whitelist ‘file,crypto‘
03-10 10:35:29.711 30750-30822/org.voiddog.ffmpeg D/TAG: Successfully opened the file.
03-10 10:35:29.711 30750-30822/org.voiddog.ffmpeg D/TAG: nal_unit_type: 7, nal_ref_idc: 3
获取编码器
03-10 10:35:29.748 30750-30822/org.voiddog.ffmpeg D/TAG: Parsing MediaFormat {image-data=https://www.songbingjia.com/android/java.nio.HeapByteBuffer[pos=0 lim=104 cap=104], mime=video/raw, crop-top=0, crop-right=1279, slice-height=720, color-format=21, height=720, width=1280, crop-bottom=719, crop-left=0, stride=1280}
03-10 10:35:29.748 30750-30822/org.voiddog.ffmpeg I/TAG: Output crop parameters top=0 bottom=719 left=0 right=1279, resulting dimensions width=1280 height=720
03-10 10:35:29.748 30750-30822/org.voiddog.ffmpeg D/TAG: MediaCodec 0xe4732200 started successfully
03-10 10:35:29.748 30750-30822/org.voiddog.ffmpeg I/TAG: MediaCodec started successfully, ret = 0
03-10 10:35:29.749 30750-30822/org.voiddog.ffmpeg I/TAG: Stream mapping:
03-10 10:35:29.749 30750-30822/org.voiddog.ffmpeg I/TAG:Stream #0:0 -> #0:0
03-10 10:35:29.749 30750-30822/org.voiddog.ffmpeg I/TAG:(h264 (h264_mediacodec) -> h264 (libx264))
03-10 10:35:29.749 30750-30822/org.voiddog.ffmpeg I/TAG:Stream #0:1 -> #0:1
03-10 10:35:29.749 30750-30822/org.voiddog.ffmpeg I/TAG:(aac (native) -> aac (native))
还是配置输出文件格式信息
03-10 10:35:29.858 30750-30822/org.voiddog.ffmpeg I/TAG: Output MediaFormat changed to {image-data=https://www.songbingjia.com/android/java.nio.HeapByteBuffer[pos=0 lim=104 cap=104], mime=video/raw, crop-top=0, crop-right=1279, slice-height=720, color-format=21, height=720, width=1280, crop-bottom=719, crop-left=0, stride=1280}
03-10 10:35:29.858 30750-30822/org.voiddog.ffmpeg D/TAG: Parsing MediaFormat {image-data=https://www.songbingjia.com/android/java.nio.HeapByteBuffer[pos=0 lim=104 cap=104], mime=video/raw, crop-top=0, crop-right=1279, slice-height=720, color-format=21, height=720, width=1280, crop-bottom=719, crop-left=0, stride=1280}
03-10 10:35:29.858 30750-30822/org.voiddog.ffmpeg I/TAG: Output crop parameters top=0 bottom=719 left=0 right=1279, resulting dimensions width=1280 height=720
03-10 10:35:29.859 30750-30822/org.voiddog.ffmpeg D/TAG: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
03-10 10:35:29.860 30750-30822/org.voiddog.ffmpeg D/TAG: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
03-10 10:35:29.862 30750-30822/org.voiddog.ffmpeg D/TAG: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
03-10 10:35:29.863 30750-30822/org.voiddog.ffmpeg D/TAG: Got output buffer 0 offset=0 size=1382400 ts=0 flags=0
03-10 10:35:29.865 30750-30822/org.voiddog.ffmpeg D/TAG: Frame: width=1280 stride=1280 height=720 slice-height=720 crop-top=0 crop-bottom=719 crop-left=0 crop-right=1279 encoder=OMX.IMG.MSVDX.Decoder.AVC
destination linesizes=1280,1280,0
03-10 10:35:29.878 30750-30822/org.voiddog.ffmpeg D/TAG: Setting ‘w‘ to value ‘-2‘
03-10 10:35:29.878 30750-30822/org.voiddog.ffmpeg D/TAG: Setting ‘h‘ to value ‘640‘
03-10 10:35:29.878 30750-30822/org.voiddog.ffmpeg D/TAG: Setting ‘flags‘ to value ‘bicubic‘
03-10 10:35:29.878 30750-30822/org.voiddog.ffmpeg V/TAG: w:-2 h:640 flags:‘bicubic‘ interl:0
03-10 10:35:29.878 30750-30822/org.voiddog.ffmpeg D/TAG: Setting ‘video_size‘ to value ‘1280x720‘
03-10 10:35:29.878 30750-30822/org.voiddog.ffmpeg D/TAG: Setting ‘pix_fmt‘ to value ‘25‘
03-10 10:35:29.879 30750-30822/org.voiddog.ffmpeg D/TAG: Setting ‘time_base‘ to value ‘1/90000‘
03-10 10:35:29.879 30750-30822/org.voiddog.ffmpeg D/TAG: Setting ‘pixel_aspect‘ to value ‘0/1‘
03-10 10:35:29.879 30750-30822/org.voiddog.ffmpeg D/TAG: Setting ‘sws_param‘ to value ‘flags=2‘
03-10 10:35:29.879 30750-30822/org.voiddog.ffmpeg D/TAG: Setting ‘frame_rate‘ to value ‘24000/1001‘
03-10 10:35:29.879 30750-30822/org.voiddog.ffmpeg V/TAG: w:1280 h:720 pixfmt:nv12 tb:1/90000 fr:24000/1001 sar:0/1 sws_param:flags=2
03-10 10:35:29.879 30750-30822/org.voiddog.ffmpeg D/TAG: compat: called with args=[yuv420p|yuvj420p|yuv422p|yuvj422p|yuv444p|yuvj444p|nv12|nv16|nv21]
03-10 10:35:29.879 30750-30822/org.voiddog.ffmpeg D/TAG: Setting ‘pix_fmts‘ to value ‘yuv420p|yuvj420p|yuv422p|yuvj422p|yuv444p|yuvj444p|nv12|nv16|nv21‘
03-10 10:35:29.881 30750-30822/org.voiddog.ffmpeg D/TAG: query_formats: 4 queried, 3 merged, 0 already done, 0 delayed
03-10 10:35:29.898 30750-30822/org.voiddog.ffmpeg V/TAG: w:1280 h:720 fmt:nv12 sar:0/1 -> w:1138 h:640 fmt:nv12 sar:0/1 flags:0x4
然后读取输入视频文件的一帧数据，然后按码率转换数据
03-10 10:35:30.514 30750-30822/org.voiddog.ffmpeg D/TAG: Clipping frame in rate conversion by 0.000206
03-10 10:35:30.522 30750-30822/org.voiddog.ffmpeg D/TAG: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
03-10 10:35:30.525 30750-30822/org.voiddog.ffmpeg D/TAG: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
03-10 10:35:30.527 30750-30822/org.voiddog.ffmpeg D/TAG: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
向输出视频文件写入数据，并显示相关数据，每一次编码完成都统计一次
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg I/TAG: video:1674kB audio:315kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg I/TAG: 0.846781%
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: Input file #0 (/storage/emulated/0/pauseRecordDemo/video/video.mp4):
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG:Input stream #0:0 (video):
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: 761 packets read (6857052 bytes);
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: 761 frames decoded
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: ;
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG:Input stream #0:1 (audio):
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: 1491 packets read (582072 bytes);
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: 1491 frames decoded
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG:(1526784 samples)
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: ;
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG:Total: 2252 packets (7439124 bytes) demuxed
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: Output file #0 (/storage/emulated/0/pauseRecordDemo/video/compress4.mp4):
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG:Output stream #0:0 (video):
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: 761 frames encoded
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: ;
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: 761 packets muxed (1714451 bytes);
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG:Output stream #0:1 (audio):
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: 1491 frames encoded
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG:(1526784 samples)
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: ;
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG: 1492 packets muxed (322676 bytes);
03-10 10:36:07.483 30750-30822/org.voiddog.ffmpeg V/TAG:Total: 2253 packets (2037127 bytes) muxed
最后输出视频编码完成，得到相关yuv等数据
03-10 10:36:07.514 30750-30822/org.voiddog.ffmpeg D/TAG: 2252 frames successfully decoded, 0 decoding errors
03-10 10:36:07.516 30750-30822/org.voiddog.ffmpeg D/TAG: Statistics: 60 seeks, 2299 writeouts
03-10 10:36:07.516 30750-30822/org.voiddog.ffmpeg I/TAG: frame I:4Avg QP:29.75size: 10897
03-10 10:36:07.517 30750-30822/org.voiddog.ffmpeg I/TAG: frame P:757Avg QP:33.43size:2206
03-10 10:36:07.517 30750-30822/org.voiddog.ffmpeg I/TAG: mb II16..4: 100.0%0.0%0.0%
03-10 10:36:07.517 30750-30822/org.voiddog.ffmpeg I/TAG: mb PI16..4:9.2%0.0%0.0%P16..4: 11.0%0.0%0.0%0.0%0.0%skip:79.8%
03-10 10:36:07.517 30750-30822/org.voiddog.ffmpeg I/TAG: final ratefactor: 36.31
03-10 10:36:07.517 30750-30822/org.voiddog.ffmpeg I/TAG: coded y,uvDC,uvAC intra: 7.9% 10.5% 3.0% inter: 2.6% 2.3% 0.1%
03-10 10:36:07.517 30750-30822/org.voiddog.ffmpeg I/TAG: i16 v,h,dc,p: 59% 22% 12%8%
03-10 10:36:07.517 30750-30822/org.voiddog.ffmpeg I/TAG: i8c dc,h,v,p: 78% 11%9%2%
03-10 10:36:07.517 30750-30822/org.voiddog.ffmpeg I/TAG: kb/s:431.97
03-10 10:36:07.529 30750-30822/org.voiddog.ffmpeg I/TAG: Qavg: 11519.111
03-10 10:36:07.529 30750-30822/org.voiddog.ffmpeg D/TAG: Statistics: 7522283 bytes read, 2 seeks
03-10 10:36:07.531 30750-30821/org.voiddog.ffmpeg I/System.out: ret: 0, time: 37992
效果
【Android 音视频深入 二十FFmpeg视频压缩】参考文章
https://www.cnblogs.com/liusx0303/p/7572050.html
https://www.jianshu.com/p/ceaa286d8aff

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