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2answers
50 views

Using nested while loops for ffmpeg processing

I'm trying to use ffmpeg's signature function to perform a duplicate analysis on several thousand video files that are listed in the text file vids.list. I need to have it so that every file is ...
0
votes
1answer
18 views

FFMPEG - Extracting a frame from .mov doesnt work (multiply errors)

When I tra to extract q frame at second 1 from a video file it says this: (running via ssh on synology diskstation with ffmpeg installed) Error with output (COMMAND ON TOP) (https://i.stack.imgur.com/...
1
vote
0answers
25 views

ffmpeg vaapi encode causes black bar on the right side

I'm trying to transcode an 854x480 h264 mp4 video to an h265 mp4 video using vaapi. The video does come out nice looking, And encodes very quickly. But there is a black bar on the right side of the ...
3
votes
1answer
278 views

How can I stream my desktop/screen to /dev/video1 as a (fake) “webcam” on Linux?

I have two commands, one that lets me record my screen to an AVI video file, and another which lets me stream a video file as a (fake) "webcam". This is really useful in apps that doesn't support ...
2
votes
0answers
157 views

Why is VLC Media Player playing videos like this?

Please see the short GIF recorded screencast of the problem in action. This is how all videos open and play, I cannot see a darn thing, just these big colored bars where the color is taken from the ...
0
votes
0answers
246 views

ffmpeg black screen recording

When I record my desktop or recording video with ffmpeg it generates a black video. My operating system is Ubuntu 18:04 bionic kernel 4.16 Here is the command I'm using : ffmpeg -f x11grab -s ...
0
votes
1answer
408 views

error ffmpeg Cannot open display :0.0+0,0, error 1. :0.0+0,0: Input/output error

Hello I get this error when i want to capture my screen on linux with ffmpeg ubuntu 16:04 : the command i'am using : $ ffmpeg -f x11grab -r 15 -s 1920x1080 -i :0.0+0,0 -vcodec rawvideo -pix_fmt ...
0
votes
0answers
85 views

convert two channels into a single channel left or right with ffmpeg

I have some .wav files and I would like to convert their frequency (fs) and number of channels (nchannels). I am using ffmpeg on a jupyter notebook, python3.6 but using linux command line with a ...
5
votes
2answers
259 views

Duplicate screen Xorg over network (Xpra ?)

I'm looking for a way to duplicate my desktop on a network. (Something that would work on a web browser client would be amazing.) I tried to use vnc / x11vnc but quality/framerate is too low. (cpu ...
1
vote
0answers
100 views

ffmpeg bash script doesn't not work with subtitles when it comes to a filename with spaces

Here is my current script #!/bin/bash while true do for f in *.mkv; do /home5/user/ffmpeg_folder/./ffmpeg-git-20181101-64bit-static/ffmpeg \ -i "$f" -c:v h264 -maxrate 12M -crf 16 -c:a copy -vf ...
1
vote
1answer
117 views

How to log a process's uptime and restarts

I know that I can check a process's uptime with the following: ps -o etime= -p "PID" where PID = pid number. I would like to write to a log when this process ends, and include it's uptime. The ...
1
vote
1answer
207 views

How I can to cut line segment video with ffmpeg?

I want to cut video from long-video with ffmpeg, I use this command: ffmpeg -i /home/nantembo/VideoPerl/1.mp4 -f avi -vcodec copy -acodec copy -ss 0:14:47 -t 0:58:55 /home/nantembo/VideoPerl/2.mp4 ...
3
votes
1answer
523 views

How to stream a local video to webcam using ffmpeg?

I have a local video and I want to stream it to a dummy webcam video device from v4l2loopback. I created the dummy device at /dev/video1. How to use ffmpeg to steam that local video trial_video.mp4 to ...
1
vote
2answers
1k views

FFMPEG: change input without stoping proccess

how i can change input on ffmpeg without stop process on linux Debian 9? im user decklink input and i need to change to file mp4 input. ffmpeg -f decklink -i 'DeckLink Mini Recorder' -vf setpts=PTS-...
0
votes
1answer
592 views

ffmpeg add video to the start and end of another

So I am using the following to convert all our videos in /home/vids to mp4 and output them in /home/vids2 but now I would like to add another video that plays before and after each video in /home/vids....
1
vote
1answer
292 views

ffmpeg mass transcode videos in directory

I have loads of videos named different things and different extensions (some mp4 some wmv etc). I would like to run the command below but on every video in a specific directory and then save that in ...
1
vote
1answer
35 views

Start playing a video at a certain time

I want to play a video at a certain time. Like an alarm. for instance, at 07:00 play video.mp4 I have tried this with crontab and with at, but no success yet
1
vote
1answer
183 views

Create CBR TS file from MXF file

I am looking for a way to create CBR TS file from a high bitrate MXF input file. I have tried to use ffmpeg, but apparently it doesn't do a good job of creating CBR output file so right now I am a bit ...
1
vote
1answer
90 views

bash parallel encoding and uploading

I am working on a bash script for encoding videos with ffmpeg in a special format. To save the resulting videos I want to upload the video as soon as the encoding is finished. Therefore I want to use ...
1
vote
0answers
471 views

Pipe viewer (PV) not working?

I'm trying to use Pipe Viewer on a video pipe that I'm both writing and reading from. The below command works perfectly when I pass temp_video.h264 as an -i input to ffmpeg. However, when I attempt ...
1
vote
1answer
451 views

FFMPEG glue MPEG TS

I have movie split in many parts with duration 10-30 seconds. All movies are MPEG TS files. I want to merge them. I try to make following: ffmpeg -f concat -i join.txt OUTPUT.TS and ffmpeg -i "...
1
vote
1answer
750 views

Mirror not found when trying to install FFMPEG on CENTOS7

I'm on a dedicated server with Root access. not familiar with servers. Im trying to install FFMpeg on my server. I'm getting errors can't figure out how to solve it. So any light on this will be very ...
0
votes
1answer
2k views

How to formulate FFmpeg command for ZERO latency streaming to VR headset?

How would one formulate a command for point-to-point 2K 60-90Hz streaming from one PC to another with lowest possible latency using ffmpeg? Full story: I built a VR headset from an eyebox off Amazon,...
1
vote
0answers
186 views

Record fullscreen program with avconv/ffmpeg?

I'm trying to record a fullscreen program (snes9x) with avconv, aka ffmpeg. I have avconv set up to use my whole screen, but it doesn't capture snes9x when I run it. #!/bin/bash avconv \ -f ...
1
vote
1answer
4k views

FFMpeg : Creating a video clip of approx. 10 seconds when video duration is unknown without audio-

I am working on a project where I am looking to extract a video clip from an input video. I have found many links(Eg : link) which do this task, but in all this I have to specify video duration. ...
0
votes
1answer
109 views

Achieving a high-availability ffmpeg system?

I wonder if there's a way to realize a sort of "high-availability" ffmpeg system. Let's say, I have two Linux servers: server1 and server2, dedicated to do some video conversion with ffmpeg. With a ...
2
votes
1answer
588 views

FFMpeg : Converting a video file to a gif with multiple images from video

I am working on a project in which the user can upload videos. Is there any way with FFmpeg I can take some images from the video and create a GIF out of it? As the project is in Java, I have a way ...
1
vote
1answer
2k views

FFMpeg : GIF to MP4 conversion throws code error.

I am trying to convert a GIF to a MP4. I am getting an error while doing that with specific parameters. What am I doing wrong? Any help would be nice. I would like a mp4 video with high quality, size ...
2
votes
2answers
5k views

ffmpeg: nvenc mit crf option - very low bitrate

I bought a new computer some time ago.. I installed nvenc for ffmpeg to encode my videos with the h264 codec. To optimize i used the -crf option but something went wrong.. I want to encode a full ...
1
vote
2answers
1k views

bash: ffmpeg libx265 prevent output

I'd like to use the new codec x265 (libx265) to encode my video collection. For this I created a lovely bash script under linux which works in general very well! But something is strange: I prohibit ...
-1
votes
1answer
991 views

how to convert video into webm format using ffmpeg in centos

how to convert video into webm format using ffmpeg and libvpx in centos I have install ffmpeg and libvpx in centos.but it's doesn't convert mp4 format into webm format. but in windows i have check, ...
14
votes
3answers
56k views

How to check if a shared library is installed?

My question originates from my problem in getting ffmpeg started. I have installed ffmpeg and it is displayed as installed: whereis ffmpeg ffmpeg: /usr/bin/ffmpeg /usr/bin/X11/ffmpeg /usr/share/...
0
votes
2answers
2k views

Alternative to ffplay for Raw Video Playback without X Windows

I am successfully capturing frames from a small USB IR camera on the small Raspberry Pi Linux board. I am using the 'libseek' code to do this: https://github.com/zougloub/libseek I can see alot of ...
0
votes
0answers
115 views

timout command is not timing out

I have a timeout command that is not timing out. user@db:~$ ps aux | grep 'timeout' user 4979 0.0 0.0 4440 628 pts/144 S+ 18:52 0:00 sh -c timeout 16 mycommand user 4980 0.0 ...
2
votes
1answer
621 views

Application specific DNS problem?

I'm working on a live stream transcoder application using nginx + ffmpeg. Everything works fine when I use avconv to transcode, but if I use ffmpeg, I get this error: [tcp @ 0xb4e9da0] Failed to ...
0
votes
3answers
9k views

Alsa Pulse Audio cannot open audio device pulse (No such file or directory) pulse: Input/output error

I'm trying to stream my Gnome Desktop I installed on my OpenVZ VPS Server, and I'm not trying to run this from SSH, but the terminal inside the GNOME desktop, I know it probably doesn't have a sound ...
5
votes
3answers
12k views

How to enable libass on Linux?

I tried to enable libass for ffmpeg with this --enable-libass in command but it didn't recognise the command. Does anyone know how to enable libass on Linux?
0
votes
1answer
1k views

FFMPEG Conversion Fails

Bad file? I'm using FFMPEG so how can I better debug and trace these issues? ffmpeg -i /home/videospace/public_html/labo/lion.3gp new_video.flv ffmpeg version N-57647-g1880294 Copyright (c) 2000-...
1
vote
1answer
2k views

ffmpeg with mp3 support: How to install (use) in user mode?

I want to use ffmpeg and libmp3lame on a stable Debian box. Alas, Debian does not support the libmp3lame package. So, I downloaded the sources for ffmpeg and the lame encoder, configured and installed ...
0
votes
0answers
2k views

ffmpeg: problems when copying the audio

When I run this ffmpeg -i video.mp4 -codec copy video.avi I get a broken audio: a crackling like a stuck LP. The input-audio is aac When I re-encode the audio like this ffmpeg -i video.mp4 -codec:v:0 ...
11
votes
2answers
31k views

How get the best quality when converting from mp4 to avi with ffmpeg?

When I use this, the quality doesn't look bad. ffmpeg -same_quant -i video.mp4 video.avi In the ffmpeg documentation is written: "Note that this is NOT SAME QUALITY. Do not use this option unless ...
8
votes
3answers
10k views

How can you trim mp3 files using `ffmpeg`?

Here is a Linux audio MP3 puzzle that has been bugging me for awhile: How to trim the beginning few seconds off an MP3 audio file? (I can't get ffmpeg -ss to work with either 00:01 or 1.000 format) ...
2
votes
3answers
3k views

installing ffmpeg-php on centos

With the help of this guide, I am trying to install ffmpeg using these commands: # cd ffmpeg-php/branches/ffmpeg-php/ffmpeg-php-0.6.1/ # replace 'PIX_FMT_RGBA32' 'PIX_FMT_RGB32' -- * # phpize # ....