ffmpeg

转换格式
ffmpeg -i input.mp4 -vcodec h264 output.mp4 

ffmpeg -i input.mp4 -vcodec mpeg4 output.mp4     这个支持微信播放

转换ts

ffmpeg -i b.mp4 -codec copy -bsf h264_mp4toannexb a.ts

ffmpeg -i input.mp4 output.avi
ffmpeg -i input_file -vcodec copy -an output_file_video　　//分离视频流
ffmpeg -i input_file -acodec copy -vn output_file_audio　　//分离音频流

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合并:

ffmpeg -i 1.mp4 -qscale 0 1.mpg
ffmpeg -i 2.mp4 -qscale 0 2.mpg
cat 1.mpg 2.mpg | ffmpeg -f mpeg -i - -qscale 0 -vcodec mpeg4 output.mp4

合并2

ffmpeg -i myfile1.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
ffmpeg -i myfile2.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
// now join
ffmpeg -i "concat:intermediate1.ts|intermediate2.ts" -c copy -bsf:a aac_adtstoasc output.mp4

ffmpeg -i input1 -i input2 -c copy -map 0 -map 1 output.mkv

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合并frames

In this example the input images are sequentially named img001.png, img002.png, img003.png, etc.

ffmpeg -framerate 24 -i img%03d.png output.mp4

For example if you want to start with img126.png then use the -start_number option:

ffmpeg -start_number 126 -i img%03d.png -pix_fmt yuv420p out.mp4

ffmpeg -framerate 10 -pattern_type glob -i '*.jpg' -c:v libx264 -pix_fmt yuv420p out.mp4

You can use cat or other tools to pipe to ffmpeg:

cat *.png | ffmpeg -f image2pipe -i - output.mkv

single image 

Example with output video duration set to 30 seconds with -t 30:

ffmpeg -loop 1 -i img.jpg -c:v libx264 -t 30 -pix_fmt yuv420p out.mp4

add audio to your images 

If you want to add audio (e.g. audio.wav) to one "poster" image, you need -shortest to tell it to stop after the audio stream is finished. The internal AAC encoder is used in this example, but you can use any other supported AAC encoder as well:
ffmpeg -loop 1 -i img.jpg -i audio.wav -c:v libx264 -c:a aac -b:a 192k -shortest out.mp4

If your audio file is using a codec that the output container supports (e.g. MP3 audio in AVI or M4A/AAC audio in MP4), you can stream copy (re-mux) it instead of re-encoding, which will preserve the audio quality:
ffmpeg -loop 1 -i img.jpg -i audio.m4a -c:v libx264 -c:a copy -shortest out.mp4

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video to images:

ffmpeg -i video.mpg image%d.jpg

video to mp3

ffmpeg -i source_video.avi -vn -ar 44100 -ac 2 -ab 192k -f mp3 sound.mp3

wav to mp3

ffmpeg -i son_origine.avi -vn -ar 44100 -ac 2 -ab 192k -f mp3 son_final.mp3

video to gif

ffmpeg -i video_origine.avi gif_anime.gif

mix sound with video

ffmpeg -i son.wav -i video_origine.avi video_finale.mpg

Exrs to video

ffmpeg -apply_trc iec61966_2_1 -start_frame 1100 -i input.$04d.exr output.mp4

bt709                        .D.V.... BT.709
 gamma                        .D.V.... gamma
 gamma22                      .D.V.... BT.470 M
 gamma28                      .D.V.... BT.470 BG
 smpte170m                    .D.V.... SMPTE 170 M
 smpte240m                    .D.V.... SMPTE 240 M
 linear                       .D.V.... Linear
 log                          .D.V.... Log
 log_sqrt                     .D.V.... Log square root
 iec61966_2_4                 .D.V.... IEC 61966-2-4
 bt1361                       .D.V.... BT.1361
 iec61966_2_1                 .D.V.... IEC 61966-2-1
 bt2020_10bit                 .D.V.... BT.2020 - 10 bit
 bt2020_12bit                 .D.V.... BT.2020 - 12 bit
 smpte2084                    .D.V.... SMPTE ST 2084
 smpte428_1                   .D.V.... SMPTE ST 428-1

another expansion:

C:/ffmpeg.exe -y -gamma 2.2 -i C:/seq_v001.%04d.exr -vcodec libx264 -pix_fmt yuv420p -preset slow -crf 18 -r 25 C:/out.mov