Commands tagged ffmpeg

A simple command to extract audio from flv/mp4 video file.

Just change extentions...

Takes all the .3gp files in the directory, rotates them by 90 degrees, and saves them in the lossless ffv1 encoding.

If this rotates in the wrong direction, you may want transponse=1

Re-encoding to ffv1 may result in a significant increase in file size, as it is a lossless format. Other applications may not recognize ffv1 if they don't use ffmpeg code. "huffyuv" might be another option for lossless saving of your transformations.

The audio may be re-encoded as well, if the encoding used by your 3gp file doesn't work in a avi container.

ffprobe is specially intended to get video information

Faster thumbnail creation than '-itsoffset'

sxga ==> 1280x1024

vga ==> 800x600

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-map 0.0:0

map the video of video.mp4 to the video of mix.mp4

-map 1.0:1

map the audio of audio.mp3 to the audio of mix.mp4

make sure that video.mp4 and audio.mp3 have the same duration

With the -vn switch we make our intentions clear and ask FFmpeg not to bother itself with the video. Next we specify the audio codec copy, which tells FFmpeg to use the same codec to encode the audio, which it uses to decode it. To keep things simple, we'll just keep the sampling and bitrate values the same.

ffmpeg [source specification if needed] -i $src -an -vcodec libx264 -coder 0 -threads 0 -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -level 13 -g 15 -crf 25 -s 320x224 -aspect 16:9 -r 15 -b 186000 -vb 186000 -minrate 176700 -maxrate 195300 -bt 9300 -bufsize 262500 -muxrate 195300 -vglobal 1 -f rtp rtp://$dstIP:$dstVideoPort1 -vn -acodec libfaac -async 2 -flags +global_header -ac 1 -ar 44100 -ab 64000 -f rtp rtp://$dstIP:$dstAudioPort1 -newaudio -an -vcodec libx264 -coder 0 -threads 0 -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -level 13 -g 20 -crf 25 -s 320x224 -aspect 16:9 -r 20 -b 286000 -vb 286000 -minrate 271700 -maxrate 300300 -bt 14300 -bufsize 367500 -muxrate 300300 -vglobal 1 -f rtp rtp://$dstIP:$dstVideoPort2 -newvideo -vn -acodec libfaac -async 2 -flags +global_header -ac 1 -ar 44100 -ab 64000 -f rtp rtp://$dstIP:$dstAudioPort2 -newaudio -an -vcodec libx264 -coder 0 -threads 0 -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -level 30 -g 25 -crf 25 -s 480x336 -aspect 16:9 -r 25 -b 386000 -vb 386000 -minrate 366700 -maxrate 405300 -bt 19300 -bufsize 472500 -muxrate 405300 -vglobal 1 -f rtp rtp://$dstIP:$dstVideoPort3 -newvideo -vn -acodec libfaac -async 2 -flags +global_header -ac 2 -ar 44100 -ab 64000 -f rtp rtp://$dstIP:$dstAudioPort3 -newaudio -an -vcodec libx264 -coder 0 -threads 0 -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -level 30 -g 25 -crf 25 -s 480x336 -aspect 16:9 -r 25 -b 686000 -vb 686000 -minrate 651700 -maxrate 720300 -bt 34300 -bufsize 787500 -muxrate 720300 -vglobal 1 -f rtp rtp://$dstIP:$dstVideoPort4 -newvideo -vn -acodec libfaac -async 2 -flags +global_header -ac 2 -ar 44100 -ab 64000 -f rtp rtp://$dstIP:$dstAudioPort4 -newaudio

Gives stereo, 16bit, 44.1kHz (default in Ubuntu/Medibuntu ffmpeg).

-aq 2 = 220-250kbit/s VBR, lower number is better quality. 2 or 3 should be good for most people. If you want the best mp3 q you should remove -aq and use -ab 320k to get 320kbit/s, but that is probably overkill for most .flv videos.

squeezed the monster (and nifty ☺) command from 7776 from 531 characters to 284 characters, but I don't see a way to get it down to 255. This is definitely a kludge!

Creates a 5 minute flv file, with the given sequence of images and audio with 0.5 fps.

The images were created using the following command:

for x in `seq 0 300`; do cp ../head.PNG head-`printf '%03d' $x`.png; done

You can also inject metadata to seek easier using yamdi as follows:

yamdi -i muxed.flv -o video.flv

To rip DVD movie to ogg format using ffmpeg, follow these steps.

1) find the vob files on the mounted video DVD in VIDEO_TS that stores the movie itself. There would be a few other VOB files that stores splash screen or special features, the vob files for the movie itself can be identified by its superior size. You can verify these vob files by playing them directly with a player (e.g. mplayer)

2) concatenate all such vob files, pipe to ffmpeg

3) calculate the video size and crop size. The ogg video size must be multiple of 16 on both width and height, this is inherit limitation of theora codec. In my case I took 512x384.

The -vcodec parameter is necessary because ffmpeg doesn't support theora by itself. -acodec is necessary otherwise ffmpeg uses flac by default.

I'm not well enough versed in the differences between ffmpeg & mencoder to know which one is better.

i have a large video file, 500+ MB, so i cant upload it to flickr, so to reduce the size i split it into 2 files. the command shows the splitting for the first file, from 0-4 minutes. ss is start time and t is duration (how long you want the output file to be).

credit goes to philc: http://ubuntuforums.org/showthread.php?t=480343

NOTE: when i made the second half of the video, i got a *lot* of lines like this:

frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbit

just be patient, it is working =)

ffmpeg

-i = input file name

-s = set frame size, qcif=176x144

-vcodec = force video codec

-r = frame-rate [default = 25]

-b = bit-rate [200 kb/s]

-acodec = force audio codec

-ab = audio bitrate in bits/s [64k]

-ac = no. of audio channels [1]

-ar = audio sampling frequency [44100 Hz]

optional:

-sameq = use same video quality as source (implies VBR)

-f = force format

-y = overwrite output files

Yet another x11grab using ffmpeg. I also added mic input to the capturing video stream using alsa. Yet I need to find out how to capture audio which is currently playing.

This command takes a set of images (from a render, for example), and converts them into a format conforming to the Blu-ray spec, or at least the version on the Wikipedia page.

Convert those .mov files that your digital camera makes to .avi

Adjust the bitrate (-b) to get the appropriate file size. A larger bitrate produces a larger (higher quality) .avi file and smaller bitrate produces a smaller (lower quality) .avi file.

Requires ffmpeg (see man page for details)

(tested with canon camera MOV files)

Other examples:

Record audio to an MP3 file via ALSA. Adjust -i argument according to arecord -l output.

Record from a webcam, audio using ALSA encoded as MP3, video as MPEG-4.