Category: Linux

Convert Video For Streaming

ffmpeg -y -i FILE_NAME.wmv -c:v libx264 -c:a aac -coder 1 -b:v 500k -threads 0 -b:a 96k FILE_NAME.mp4

if you want to scale the video to a specific size, use -vf scale option, for example

ffmpeg -y -i FILE_NAME.wmv -vf scale=720:480 -c:v libx264 -c:a aac -coder 1 -b:v 500k -threads 0 -b:a 96k FILE_NAME.mp4

Inject metadata

qt-faststart FILE_NAME.mp4 FILE_NAME-meta.mp4

Convert Video to MP4

This is verified method, and works good, i converted many videos, no quality lose

ffmpeg  -i FILE_NAME.INPUT_EXTN -crf 25.0 -c:v libx264 -c:a libfaac -ar 48000 -b:a 160k -coder 1 -threads 0 FILE_NAME_nm.mp4

If you get error related to libfaac, try changing it with aac.

To cut a video during transcoding

time ffmpeg -ss 00:34:00 -t 00:02:00 -i FILE_NAME.INPUT_EXTN -crf 25.0 -c:v libx264 -c:a libfaac -ar 48000 -b:a 160k -coder 1 -threads 0 FILE_NAME_nm.mp4

Other Methods, Need to experiment

To convert video to H.264 (mp4) format

ffmpeg -i 'input.mpg' -acodec libfaac -ab 96k -vcodec libx264 -vpre hq -crf 22 -threads 0 output.mp4

ffmpeg -i 'input.mpg' -vcodec libx264 -vpre hq -b 1M -bt 1M -threads 0 outfile.mp4

ffmpeg -i test.avi -acodec libfaac -ab 128k -ar 44100 -s 704x400 -r 20 -vcodec libx264 -b 256000 -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -me_method umh -subq 5 -trellis 1 -refs 2 -bf 1 -coder 1 -me_range 16 -g 300 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 256000 -maxrate 4M -bufsize 4M -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 21 test.mp4

ffmpeg -y -i source.avi -vcodec libx264 -b BITRATE -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -flags2 +mixed_refs -me umh -subq 5 -trellis 1 -refs 5 -bf 3 -b_strategy 1 -coder 1 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt "$vbitrate" -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 41 -acodec libfaac -ac 2 -ar 48000 -ab "$abitrate" -f mov out.mov

Using ffmpeg and x264

Example two-pass encoding script:

#!/bin/bash
# Two-Pass x264 Encoding Script
# Usage: ./264encode.sh input output.mp4

# Pass 1
ffmpeg -y -i $1 -pass 1 -b 512k -bt 512k -vcodec libx264 -an -threads 0 -coder 1 -flags +loop -cmp +chroma -partitions -parti8x8-parti4x4-partp8x8-partp4x4-partb8x8 -me_method dia -subq 1 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -b_strategy 1 -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -bf 16 -refs 1 -directpred 1 -bidir_refine 0 -trellis 0 -flags2 -bpyramid-wpred-mixed_refs-dct8x8+fastpskip -f mp4 /dev/null

# Pass 2
ffmpeg -y -i $1 -pass 2 -b 512k -bt 512k -vcodec libx264 -acodec libfaac -ab 128k -ac 2 -threads 0 -coder 1 -flags +loop -cmp +chroma -partitions +parti8x8+parti4x4+partp8x8+partb8x8 -me_method umh -subq 8 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -b_strategy 1 -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -bf 16 -refs 4 -directpred 3 -trellis 1 -flags2 +bpyramid+wpred+mixed_refs+dct8x8+fastpskip -f mp4 $2

To use

sh 264encode.sh input.avi output.mp4

See ffmpeg

Create thumbnail with ffmpeg

To create thumbnail from video using ffmpeg, use

ffmpeg -y -ss HH:MM:SS -i VIDEO.AVI -f image2 -vframes 1 1.jpg

Here

HH:MM:SS = replace with time where you want to take screen shot.

1.jpg = is the tumbnail image generated.

Create thumbnail with mplayer

METHOD 1

mkdir out
mplayer VIDEO.AVI -ss 0:8:0 -nosound -vo jpeg:outdir=out -frames 2

-ss = you can specify time in seconds or in hh:mm:ss format.

-frames 2 = create 2 thumbnails with name 00000001.jpg and 00000002.jpg

-ss 0:8:0 = thumbnail from 8th minutes

METHOD 2

mencoder -ss 00:25:00 -endpos 0.001 -ovc copy -nosound VIDEO.AVI -o tmpfile1
mplayer -nosound -vo jpeg tmpfile1

Create thumbnail with avconv

avconv -ss 00:01:00 -i VIDEO_FILE.mp4 -f image2 -frames:v 1 1.jpeg

This will create thumbnail 1.jpeg from video.

-ss 00:01:00 – Time from where image is taken.

See ffmpeg

To Scape a Video using ffmpeg, run

ffmpeg -i FILE_NAME.avi -vf scale=1280:720 FILE_NAME_OUT.avi

See ffmpeg

To cut a video using ffmpeg, use

ffmpeg -ss 00:17:00 -i IN_FILE.avi -t DURATION_IN_SECONDS -acodec copy -vcodec copy -async 1 OUT_FILE.avi

To cut a video and encoding it

ffmpeg -ss 00:17:00 -i IN_FILE.avi -t DURATION_IN_SECONDS -crf 25.0 -c:v libx264 -c:a aac -ar 48000 -b:a 160k -coder 1 -threads 0 OUT_FILE.mp4

DURATION_IN_SECONDS specify duration of new clip. If you specify 60, it will cut 60 seconds of video start from time specified in -ss. In this cause, from 00:17:00 to 00:18:00.

For more info, see “Cutting small sections” part of ffmpeg documentation.

https://trac.ffmpeg.org/wiki/Seeking

ffmpeg -ss 00:34:00 -t 00:02:00 -i IN_FILE.wmv -crf 25.0 -c:v libx264 -c:a libfaac -ar 48000 -b:a 160k -coder 1 -threads 0 OUT_FILE.mp4

In this example

-ss 0:34:00 -t 0:02:00

Means cut video from 00:34:00 to 00:36:00

If you want to cut a video from time 01:00:00 to 01:20:00, use

-ss 01:00:00 -t 00:20:00

10-Apr-2013 This command works great, i tested on many videos.

Cut video with avconv

avconv -y -ss 00:04:00 -i BootstrapWebDesign-03.mov -t 00:00:30 -crf 25.0 -c:v libx264 -c:a libvo_aacenc -ar 48000 -b:a 160k -coder 1 -threads 0 1.mp4

Cut video with mencoder

mencoder -ss 01:00:00 -endpos 00:00:30 -ovc copy -oac copy 1.avi -o 2.avi

-ss = start time in hh:mm:ss format

-endpos = Duration in hh:mm:ss format

Example

Following with create a video “out.avi” from MSFT.avi from 00:24:00 to 00:25:00

mencoder -ss 00:24:00 -endpos 00:01:00 -ovc copy -oac copy MSFT.avi -o out.avi

21 April 2011 verified and working

See ffmpeg