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Questions tagged [video-encoding]

100 questions
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3 answers

Re-encoding video library in x265 (HEVC) with no quality loss

I am trying to convert my video library to HEVC format to gain space. I ran the following command on all of the video files in my library: #!/bin/bash for i in *.mp4; do #Output new files by prepending "X265" to the names avconv -i "$i"…
shivams
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28
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4 answers

Convert a video to a fixed screen size by cropping and resizing

I've tried to figure this out myself, but the myriad of options just baffles me. I want to use ideally either ffmpeg or mencoder (or something else, but those two I know I have working) to convert any incoming video to a fixed screen size. If the…
Andy Jeffries
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26
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4 answers

Converting PNG frames to video at 1 FPS

I have video frames in PNG format at 1 FPS and I'm trying to convert them into a video using ffmpeg. If I do something like this: ffmpeg -i data/input-%4d.png data/output.mp4 I get a video at 25FPS which is basically a very fast-forward of the input…
Assaf Lavie
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13
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7 answers

FFMPEG - Interpolate frames or add motion blur

I just watched the trailer for the hobbit, and a trailer for the avengers which both feature an increased framerate. A lot of the comments state that this isn't "true" 60fps since it was not shot at 60fps, but actually a lower frame-rate that has…
Programster
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1 answer

How to significantly lower a video file size with ffmpeg without quality loss?

I see there are videos on youtube with 1080p resolution that are more than 10 minutes long and only 50-60 mb in size. I have a video only 3 minutes long and only 720p resolution but unable to bring it down below 90mb in size. I checked another…
Sanchit
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11
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3 answers

How to convert a VOB file to avi?

I am trying to convert a VOB file copied from a DVD into an avi in Ubuntu 13.10. I tried dvdrip, which failed due to a frame count error or something. I tried acidrip as well, but it always choose an audio track I did not want to use. I would prefer…
Alex
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9
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2 answers

Interactively concatenate video files

How to concatenate (join) multiple MP4 video files into one file interactively? There are a lot of programs that do this for two files from the command line. For instance: ffmpeg avconv MP4Box But we frequently need a solution to do this…
Slyx
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8
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4 answers

Trouble getting VLC to record from the webcam via command line

my ~/.bashrc contains the following function webcamrecord () { vlc v4l2:// :v4l-vdev="/dev/video0" :v4l-adev="/dev/audio2" :v4l-norm=3 :v4l-frequency=-1 :v4l-caching=300 :v4l-chroma="" :v4l-fps=-1.000000 :v4l-samplerate=44100 :v4l-channel=0…
ixtmixilix
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How to re-encode a DVD into a single file?

A DVD file layout has a directory named "VIDEO_TS" which contains a variety of files. These files can include multiple video and audio channels, subtitles, and menu structure (UI). Is there a format than can contain all of these, but in a single…
tshepang
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Handbrake new VP9 codec is grayed out

Handbrake new VP9 codec is grayed out and could not be used. I installed Linux Mint fresh from ppa repo that is referenced on their homepage. libav and the vpx-tools are installed. What have I missed? What can I check?
zanglerecke
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2 answers

Convert image based subtitle to text based subtitle inside MKV file

How do I convert a hdmv_pgs_subtitle (which is image based) to a text based subtitle in a MKV file? I have tried ffmpeg -i in.mkv -c:v copy -c:a copy -c:s mov_text out.mkv but that results with the following error: Stream mapping: Stream #0:0 ->…
Oskar Persson
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Trans-coding hevc / x265 video file using VLC and viewing it on a chromecast

I've been successful at getting VLC to stream a x264 encoded file from a network file share to an old chromecast (which mine doesn't support hevc / x265 directly) using the commands below. vlc -vv --sout "#chromecast"…
Rick T
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5
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Don't wait for audio stream with ffmpeg/avconv using named pipes

I have two named pipes, audio_conv and video, for s16le and h264 streams, respectively. I want to convert them to webm format on fly. Data to these pipes proceeds from my application, that parses proprietary format and converts audio. But sometimes…
FunkyCat
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5
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1 answer

Text to movie from commandline

I need a script called myslide which does the following: myslide -f 15 -t 20 "Hello World" produces a movie file (to be played by mplayer), which just displays "Hello World" in the center of the screen in font size 15 for 20 seconds. Is there an…
student
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5 answers

H.264 support in Firefox (Iceweasel) 24

I am using Firefox (Iceweasel) 24 in Debian Wheezy. When I go to https://www.youtube.com/html5 it shows me that my browser does not support H.264 When I go to the same URL with Chrome, it shows H.264 is supported After googling, I found few debian…
Martin Vegter
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