man ffmpeg Command

Man page for apt-get ffmpeg Command

Man Page for ffmpeg in Linux

Ubuntu Man Command : man ffmpeg

Man Ffmpeg  Command

This tutorial shows the man page for man ffmpeg in linux.

Open terminal with 'su' access and type the command as shown below:
man ffmpeg

Result of the Command Execution shown below:

FFMPEG(1)                                                                                                                                                  FFMPEG(1)



NAME
ffmpeg FFmpeg video converter

SYNOPSIS
ffmpeg [[infile options][ i infile]]... {[outfile options] outfile}...

DESCRIPTION
As a general rule, options are applied to the next specified file. Therefore, order is important, and you can have the same option on the command line
multiple times. Each occurrence is then applied to the next input or output file.

* To set the video bitrate of the output file to 64kbit/s:

ffmpeg i input.avi b 64k output.avi

* To force the frame rate of the output file to 24 fps:

ffmpeg i input.avi r 24 output.avi

* To force the frame rate of the input file (valid for raw formats only) to 1 fps and the frame rate of the output file to 24 fps:

ffmpeg r 1 i input.m2v r 24 output.avi

The format option may be needed for raw input files.

By default, FFmpeg tries to convert as losslessly as possible: It uses the same audio and video parameters for the outputs as the one specified for the
inputs.

OPTIONS
Main options
L Show license.

h Show help.

version
Show version.

formats
Show available formats, codecs, bitstream filters, protocols, and frame size and frame rate abbreviations.

The fields preceding the format and codec names have the following meanings:

D Decoding available

E Encoding available

V/A/S
Video/audio/subtitle codec

S Codec supports slices

D Codec supports direct rendering

T Codec can handle input truncated at random locations instead of only at frame boundaries

f fmt
Force format.

i filename
input file name

y Overwrite output files.

t duration
Restrict the transcoded/captured video sequence to the duration specified in seconds. "hh:mm:ss[.xxx]" syntax is also supported.

fs limit_size
Set the file size limit.

ss position
Seek to given time position in seconds. "hh:mm:ss[.xxx]" syntax is also supported.

itsoffset offset
Set the input time offset in seconds. "[ ]hh:mm:ss[.xxx]" syntax is also supported. This option affects all the input files that follow it. The offset
is added to the timestamps of the input files. Specifying a positive offset means that the corresponding streams are delayed by 'offset' seconds.

timestamp time
Set the timestamp.

metadata key=value
Set a metadata key/value pair.

For example, for setting the title in the output file:

ffmpeg i in.avi metadata title="my title" out.flv

v number
Set the logging verbosity level.

target type
Specify target file type ("vcd", "svcd", "dvd", "dv", "dv50", "pal vcd", "ntsc svcd", ... ). All the format options (bitrate, codecs, buffer sizes) are
then set automatically. You can just type:

ffmpeg i myfile.avi target vcd /tmp/vcd.mpg

Nevertheless you can specify additional options as long as you know they do not conflict with the standard, as in:

ffmpeg i myfile.avi target vcd bf 2 /tmp/vcd.mpg

dframes number
Set the number of data frames to record.

scodec codec
Force subtitle codec ('copy' to copy stream).

newsubtitle
Add a new subtitle stream to the current output stream.

slang code
Set the ISO 639 language code (3 letters) of the current subtitle stream.

Video Options
b bitrate
Set the video bitrate in bit/s (default = 200 kb/s).

vframes number
Set the number of video frames to record.

r fps
Set frame rate (Hz value, fraction or abbreviation), (default = 25).

s size
Set frame size. The format is wxh (ffserver default = 160x128, ffmpeg default = same as source). The following abbreviations are recognized:

sqcif
128x96

qcif
176x144

cif 352x288

4cif
704x576

qqvga
160x120

qvga
320x240

vga 640x480

svga
800x600

xga 1024x768

uxga
1600x1200

qxga
2048x1536

sxga
1280x1024

qsxga
2560x2048

hsxga
5120x4096

wvga
852x480

wxga
1366x768

wsxga
1600x1024

wuxga
1920x1200

woxga
2560x1600

wqsxga
3200x2048

wquxga
3840x2400

whsxga
6400x4096

whuxga
7680x4800

cga 320x200

ega 640x350

hd480
852x480

hd720
1280x720

hd1080
1920x1080

aspect aspect
Set aspect ratio (4:3, 16:9 or 1.3333, 1.7777).

croptop size
Set top crop band size (in pixels).

cropbottom size
Set bottom crop band size (in pixels).

cropleft size
Set left crop band size (in pixels).

cropright size
Set right crop band size (in pixels).

padtop size
Set top pad band size (in pixels).

padbottom size
Set bottom pad band size (in pixels).

padleft size
Set left pad band size (in pixels).

padright size
Set right pad band size (in pixels).

padcolor hex_color
Set color of padded bands. The value for padcolor is expressed as a six digit hexadecimal number where the first two digits represent red, the middle two
digits green and last two digits blue (default = 000000 (black)).

vn Disable video recording.

bt tolerance
Set video bitrate tolerance (in bits, default 4000k). Has a minimum value of: (target_bitrate/target_framerate). In 1 pass mode, bitrate tolerance
specifies how far ratecontrol is willing to deviate from the target average bitrate value. This is not related to min/max bitrate. Lowering tolerance too
much has an adverse effect on quality.

maxrate bitrate
Set max video bitrate (in bit/s). Requires bufsize to be set.

minrate bitrate
Set min video bitrate (in bit/s). Most useful in setting up a CBR encode:

ffmpeg i myfile.avi b 4000k minrate 4000k maxrate 4000k bufsize 1835k out.m2v

It is of little use elsewise.

bufsize size
Set video buffer verifier buffer size (in bits).

vcodec codec
Force video codec to codec. Use the "copy" special value to tell that the raw codec data must be copied as is.

sameq
Use same video quality as source (implies VBR).

pass n
Select the pass number (1 or 2). It is used to do two pass video encoding. The statistics of the video are recorded in the first pass into a log file
(see also the option passlogfile), and in the second pass that log file is used to generate the video at the exact requested bitrate. On pass 1, you
may just deactivate audio and set output to null, examples for Windows and Unix:

ffmpeg i foo.mov vcodec libxvid pass 1 an f rawvideo y NUL
ffmpeg i foo.mov vcodec libxvid pass 1 an f rawvideo y /dev/null

passlogfile prefix
Set two pass log file name prefix to prefix, the default file name prefix is ``ffmpeg2pass''. The complete file name will be PREFIX N.log, where N is a
number specific to the output stream.

newvideo
Add a new video stream to the current output stream.

Advanced Video Options
pix_fmt format
Set pixel format. Use 'list' as parameter to show all the supported pixel formats.

sws_flags flags
Set SwScaler flags (only available when compiled with swscale support).

g gop_size
Set the group of pictures size.

intra
Use only intra frames.

vdt n
Discard threshold.

qscale q
Use fixed video quantizer scale (VBR).

qmin q
minimum video quantizer scale (VBR)

qmax q
maximum video quantizer scale (VBR)

qdiff q
maximum difference between the quantizer scales (VBR)

qblur blur
video quantizer scale blur (VBR) (range 0.0 1.0)

qcomp compression
video quantizer scale compression (VBR) (default 0.5). Constant of ratecontrol equation. Recommended range for default rc_eq: 0.0 1.0

lmin lambda
minimum video lagrange factor (VBR)

lmax lambda
max video lagrange factor (VBR)

mblmin lambda
minimum macroblock quantizer scale (VBR)

mblmax lambda
maximum macroblock quantizer scale (VBR)

These four options (lmin, lmax, mblmin, mblmax) use 'lambda' units, but you may use the QP2LAMBDA constant to easily convert from 'q' units:

ffmpeg i src.ext lmax 21*QP2LAMBDA dst.ext

rc_init_cplx complexity
initial complexity for single pass encoding

b_qfactor factor
qp factor between P and B frames

i_qfactor factor
qp factor between P and I frames

b_qoffset offset
qp offset between P and B frames

i_qoffset offset
qp offset between P and I frames

rc_eq equation
Set rate control equation (default = "tex^qComp").

rc_override override
rate control override for specific intervals

me_method method
Set motion estimation method to method. Available methods are (from lowest to best quality):

zero
Try just the (0, 0) vector.

phods
log
x1
hex
umh
epzs
(default method)

full
exhaustive search (slow and marginally better than epzs)

dct_algo algo
Set DCT algorithm to algo. Available values are:

0 FF_DCT_AUTO (default)

1 FF_DCT_FASTINT

2 FF_DCT_INT

3 FF_DCT_MMX

4 FF_DCT_MLIB

5 FF_DCT_ALTIVEC

idct_algo algo
Set IDCT algorithm to algo. Available values are:

0 FF_IDCT_AUTO (default)

1 FF_IDCT_INT

2 FF_IDCT_SIMPLE

3 FF_IDCT_SIMPLEMMX

4 FF_IDCT_LIBMPEG2MMX

5 FF_IDCT_PS2

6 FF_IDCT_MLIB

7 FF_IDCT_ARM

8 FF_IDCT_ALTIVEC

9 FF_IDCT_SH4

10 FF_IDCT_SIMPLEARM

er n
Set error resilience to n.

1 FF_ER_CAREFUL (default)

2 FF_ER_COMPLIANT

3 FF_ER_AGGRESSIVE

4 FF_ER_VERY_AGGRESSIVE

ec bit_mask
Set error concealment to bit_mask. bit_mask is a bit mask of the following values:

1 FF_EC_GUESS_MVS (default = enabled)

2 FF_EC_DEBLOCK (default = enabled)

bf frames
Use 'frames' B frames (supported for MPEG 1, MPEG 2 and MPEG 4).

mbd mode
macroblock decision

0 FF_MB_DECISION_SIMPLE: Use mb_cmp (cannot change it yet in FFmpeg).

1 FF_MB_DECISION_BITS: Choose the one which needs the fewest bits.

2 FF_MB_DECISION_RD: rate distortion

4mv
Use four motion vector by macroblock (MPEG 4 only).

part
Use data partitioning (MPEG 4 only).

bug param
Work around encoder bugs that are not auto detected.

strict strictness
How strictly to follow the standards.

aic
Enable Advanced intra coding (h263+).

umv
Enable Unlimited Motion Vector (h263+)

deinterlace
Deinterlace pictures.

ilme
Force interlacing support in encoder (MPEG 2 and MPEG 4 only). Use this option if your input file is interlaced and you want to keep the interlaced
format for minimum losses. The alternative is to deinterlace the input stream with deinterlace, but deinterlacing introduces losses.

psnr
Calculate PSNR of compressed frames.

vstats
Dump video coding statistics to vstats_HHMMSS.log.

vstats_file file
Dump video coding statistics to file.

vhook module
Insert video processing module. module contains the module name and its parameters separated by spaces.

top n
top=1/bottom=0/auto= 1 field first

dc precision
Intra_dc_precision.

vtag fourcc/tag
Force video tag/fourcc.

qphist
Show QP histogram.

vbsf bitstream_filter
Bitstream filters available are "dump_extra", "remove_extra", "noise", "h264_mp4toannexb", "imxdump", "mjpegadump".

ffmpeg i h264.mp4 vcodec copy vbsf h264_mp4toannexb an out.h264

Audio Options
aframes number
Set the number of audio frames to record.

ar freq
Set the audio sampling frequency (default = 44100 Hz).

ab bitrate
Set the audio bitrate in bit/s (default = 64k).

aq q
Set the audio quality (codec specific, VBR).

ac channels
Set the number of audio channels (default = 1).

an Disable audio recording.

acodec codec
Force audio codec to codec. Use the "copy" special value to specify that the raw codec data must be copied as is.

newaudio
Add a new audio track to the output file. If you want to specify parameters, do so before " newaudio" (" acodec", " ab", etc..).

Mapping will be done automatically, if the number of output streams is equal to the number of input streams, else it will pick the first one that
matches. You can override the mapping using " map" as usual.

Example:

ffmpeg i file.mpg vcodec copy acodec ac3 ab 384k test.mpg acodec mp2 ab 192k newaudio

alang code
Set the ISO 639 language code (3 letters) of the current audio stream.

Advanced Audio options:
atag fourcc/tag
Force audio tag/fourcc.

absf bitstream_filter
Bitstream filters available are "dump_extra", "remove_extra", "noise", "mp3comp", "mp3decomp".

Subtitle options:
scodec codec
Force subtitle codec ('copy' to copy stream).

newsubtitle
Add a new subtitle stream to the current output stream.

slang code
Set the ISO 639 language code (3 letters) of the current subtitle stream.

sn Disable subtitle recording.

sbsf bitstream_filter
Bitstream filters available are "mov2textsub", "text2movsub".

ffmpeg i file.mov an vn sbsf mov2textsub scodec copy f rawvideo sub.txt

Audio/Video grab options
vc channel
Set video grab channel (DV1394 only).

tvstd standard
Set television standard (NTSC, PAL (SECAM)).

isync
Synchronize read on input.

Advanced options
map input_stream_id[:sync_stream_id]
Set stream mapping from input streams to output streams. Just enumerate the input streams in the order you want them in the output. sync_stream_id if
specified sets the input stream to sync against.

map_meta_data outfile:infile
Set meta data information of outfile from infile.

debug
Print specific debug info.

benchmark
Add timings for benchmarking.

dump
Dump each input packet.

hex
When dumping packets, also dump the payload.

bitexact
Only use bit exact algorithms (for codec testing).

ps size
Set packet size in bits.

re Read input at native frame rate. Mainly used to simulate a grab device.

loop_input
Loop over the input stream. Currently it works only for image streams. This option is used for automatic FFserver testing.

loop_output number_of_times
Repeatedly loop output for formats that support looping such as animated GIF (0 will loop the output infinitely).

threads count
Thread count.

vsync parameter
Video sync method. Video will be stretched/squeezed to match the timestamps, it is done by duplicating and dropping frames. With map you can select from
which stream the timestamps should be taken. You can leave either video or audio unchanged and sync the remaining stream(s) to the unchanged one.

async samples_per_second
Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps, the parameter is the maximum samples per second by which the audio is
changed. async 1 is a special case where only the start of the audio stream is corrected without any later correction.

copyts
Copy timestamps from input to output.

shortest
Finish encoding when the shortest input stream ends.

dts_delta_threshold
Timestamp discontinuity delta threshold.

muxdelay seconds
Set the maximum demux decode delay.

muxpreload seconds
Set the initial demux decode delay.

Preset files
A preset file contains a sequence of option=value pairs, one for each line, specifying a sequence of options which would be awkward to specify on the command
line. Lines starting with the hash ('


Related Topics

Apt Get Commands