Questions tagged [ffmpeg]
`ffmpeg` is a free software project aimed at producing tools (libraries and programs) for handling multimedia data.
671 questions
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Hit noise when playing part of wave file with ALSA PCM interface
I am working a WAVE file playing with ALSA PCM interface in Linux, and I heard noise when I played the file quickly and partially.
Here is my playing function.
static int playback_function(uint8_t *...
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1
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14
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Failed to get PTS from live audio stream with ffmpeg in Linux
I am working on audio playing in Linux with ffmpeg-4.4.4.
Now I found sometimes the PTS in the live audio stream is 0, which caused failure of calculating current position when playing the stream (....
- 551
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42
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audio to video with ffmpeg
I would like to know if it is possible to combine video with audio using ffmpeg batch converter but the video should end when the audio sound ends. Does anyone know how to do this?
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ffmpeg with NVenc does not seem to utilize my GPU
I tried to convert a high-resolution video to 2k. I used this command:
ffmpeg -i input_video.mp4 -vf scale=1920:1080 -c:v h264_nvenc -preset slow -b:v 8M output_video.mp4
Based on the top and nvidia-...
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yt-dlp -- how to add ffmpeg conversion after download
I'm using a rather long yt-dlp command to download and convert the downloaded files into mp4 format. However, the resulting mp4 files sometimes cause problems. That's why I would like to add a ffmpeg ...
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36
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How to trim beginning AND fade in at the same time with ffmpeg
Using ffmpeg, there are suggestions on how to trim or how to fade in, but how can you do both in one command?
The video should start black at 00:10:07 with a fade in for 1 second, so at 00:10:08 it ...
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39
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How to stream a local video to virtual webcam using ffmpeg?
I created the virtual camera "abdullah". How to use ffmpeg to steam that local video trial_video.mp4 to the virtual camera?
I am using windows 11.
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Map streams in ffmpeg based on title (to remove language variant)
I have a few video files with English audio track and French audio track, because the family wants French and I prefer VO. With ffmpeg I can easily filter all tracks to keep eng and fre, the problem ...
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52
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Cannot compile ffmpeg with nvdec on Jetson Orin NX
I struggle with compiling ffmpeg for Jetson Orin NX with hardware acceleration enabled
I checked the default package using this command ffmpeg -hwaccels and I saw that only cuda and drm are enabled. I ...
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How to convert Opus audio file to mp3 with maximum quality use FFmpeg?
How to convert Opus audio file to mp3 with maximum quality use FFmpeg? Linux.
Source audio file is Opus, stereo 48 kHz, 138 kbps, Bits per sample:32
I used
ffmpeg -i audio.opus -c:a libmp3lame -q:a 0 ...
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I want to write a script that simultaneously renders what's on my webcam to a window on my screen and records a video
I have tried a combination of:
v4l2loopback
ffmpeg
mpv
But either the web-cam view, or the web-cam record works, but never both together.
Can anyone provide a script that achieves this?
This is what ...
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49
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inotifywait to convert (ffmpeg) multiple files
I want to automatize a job, i.e. the conversion of videos (taken by mobile phones) with ffmpeg on my nextcloud server. The bashscript I run manually runs fine:
#!/bin/bash
for i in *.3gp *.avi *.m4v *...
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1
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FFmpeg: To trim a video using 'trim' and specify time using HH:MM:SS format [closed]
FFmpeg 7.0.1. I want to understand whether it is possible to trim a video using trim and to specify start and end time using the HH:MM:SS format instead of just seconds.
That is, the following command ...
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FFmpeg: The option 'to' works differently depending on where we put it. Why is it so?
Could anybody explain, why
ffmpeg -i input.mov -ss 00:00:10 -to 00:00:15 output1.mov
produces a 5-second video, from second 10 to second 15, whereas
ffmpeg -ss 00:00:10 -i input.mov -to 00:00:15 ...
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149
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Trimming a video using FFmpeg leads to black screen [closed]
I try to figure out how to use FFmpeg to trim videos. I have created a 30 second .mov screen capture using Apple's QuickTime player, and then tried to trim it using three different ways:
Using -...
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28
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ffmpeg causes do loop to exit after first iteration [duplicate]
I have this loop to find mp4 files that I want to convert to webm.
find "./$1" -type f -iname "*.mp4" | while IFS== read -r f; do
echo "found: $f"
fn=$( ...
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36
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Behavior of ffmpeg when recording a stream and then network does not work for a while
I think it would be good, if ffmpeg would exit with error, if it finds out that network is not working and it thus can not record the given URL. But in my experience it just leaves there and can not ...
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73
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How to extract song lyrics from an m4a subtitle stream?
I have these .m4a files for which ffprobe (on Debian 12.1) reports:
Stream #0:1[0x2](eng): Data: bin_data (text / 0x74786574), 0 kb/s
Metadata:
handler_name : SubtitleHandler
...
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71
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Fast test for audio file bitrate
I'm trying to identify files with high/low bitrate in my audio collection using a shell script. Doing file test.mp3 is very fast:
$time file test.mp3
test.mp3: Audio file with ID3 version 2.3.0, ...
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138
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FFPLAY - loop sound until signal received
I have a bash script which starts ffplay in background, looping a short sound sample indefinitely. Then it does some other work, and finally it kills ffplay.
foo() {
ffplay -loop 0 sound.wav &&...
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Can I Store the Output of FFmpeg to a Different PC?
I have a question about storing the output of a screen recording using FFmpeg.
Currently, I want to use the:
ffmpeg -video_size 1024x768 -framerate 25 -f x11grab -i :0.0 output.mp4
command to grab a ...
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596
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Convert swf files to mp4
I came accross this nice web. There are swf and mp3 files.
I'd like to convert them to mp4 or something, so it is viewable.
I tried gnash and ffmpeg without success.
I'm on Lubuntu 22.04
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58
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Passing video from v4l2loopback to v4l2src (edgetpuvision) using netcat
I am trying to use webcam from a tablet as stream source for TensorFlow Model on Coral Dev Board.
My idea is to pass the stream from the tablet using netcat:
ffmpeg -i /dev/video0 -filter:v fps=30 -f ...
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173
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How to limit FFmpeg bitrate while recording an RTSP stream with codec copy?
I am trying to record a short video from an RTSP stream using FFmpeg.
And I am facing the following problem: the video size is too large.
Using the command ffmpeg -i file.mp4, I've come to the ...
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771
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How to get proper ffplay output with UVC camera?
My end goal is to use a UVC webcam with esp32 or Raspberry PI. I was hoping to learn while doing some fun projects.
I have an old UVC webcam (Creative model ct6840) but I can't seem to get it to work ...
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ffmpeg: error while loading shared libraries: libavdevice.so.58: cannot open shared object file: Error 74
Since today when I run ffmpeg I have the error in the title of this question.
I tried this, but can't apply the solution because I have a directory /etc/ld.so.conf.d and in that directory there are ...
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FFMPEG: Impossible to convert between the formats supported by the filter 'graph 0 input from stream 1:0' and the filter 'auto_scale_0'
this my ffmpeg call in script:
ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128 \
-i "_$v" -i /home/john/Web/blackblog/_meta/graphics/watermark.png \
...
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139
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Flag parameter in bash script misunderstood as file , “no such file or directory"
I’m writing a simple bash script named video2png, using the ffmpeg to turn certain frame of a video into png:
#!/bin/bash
ffmpeg -ss 30:00 -i "$1" -frames 1 -s 1280x880 -f image2 "$2&...
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1
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95
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How to detect if a process runs longer than X seconds, then do something with it?
I’m on debian.
I am calling a ffmpeg process to generate a mp3. this gets called from a php script using shell_exec. This works fine 99% of the time.
Sometimes, the ffmpeg process doesn’t exit and I’m ...
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136
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Use `xautolock` to run script which captures image with `ffmpeg` after unlocking
I'm using i3wm and I want a script to run after I've unlocked my
screen. I can get this to work when I manually lock my screen,
e.g. using the steps outlined in
this
post.
But I can't get this to work ...
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Linux I/O issue? Multiple FFMPEG saving streams as HLS, lose segments despite low CPU and Memory consumption
I'm capturing an RTMP stream as HLS (saving playlist files) using FFMPEG wihout any stream processing, merely copying it.
Thanks to such setup I'm able to run tens of processes (I've tried 80 at most),...
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221
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grep the output of FFmpeg
I can use grep to manipulate the output of all applications i use (or do something with sed or other tools). This doesn't work with FFmpeg. This is the output when i convert an audio file:
ffmpeg ...
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41
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ffmpeg inside while loop with find unintentionally alters iteration variable
Can someone please explain to me what is happening here? This is what I have reduced my situation down to:
# make 20 test gifs out of the same source file.
for i in {1..20}; do cp -p ../some-random-...
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164
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ffmpeg fails to read m2ts files from libaacs
I have a bluray disc that I am attempting to convert on Manjaro Linux using libbluray and libaacs.
AACS handled shows "yes". Additionally, VLC plays the bluray with no problem. but when I ...
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657
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mpv fails to play youtube videos
I've been using mpv for a while, but now whenever I try to play a youtube video the following output shows up:
[ffmpeg] https: HTTP error 403 Forbidden
Failed to open https://rr5. . .
EDL: Could not ...
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577
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ffmpeg redirect stdout and stderr to each file and both to another in correct order
Running a simple ffmpeg command:
ffmpeg -i in.avi out.mp4 -loglevel info
I want the following result:
stdout to both stdout.log and both.log
stderr to both stderr.log and both.log
The important thing ...
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239
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ISO Media Videos thumbnails not showing in pop_os 22.04 LTS
all videos that are ISO media doesn't have thumbnails.
I have tried the solutions here, but it didn't work (EDIT: im a noob, so its possibly those didnt work because im using pop_os distro, and those ...
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2
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848
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Batch convert flac to ogg with ffmpeg
I'm trying to turn this command into one that will convert a whole directory from flac to ogg:
ffmpeg -i musicfile.flac musicfile.ogg
I've read through the man page. But honestly it's a bit over my ...
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312
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Referencing ffmpeg dependencies for PyAV installation
I need to install PyAV for loading and using videos as input (as a Tensor) to a pytorch model. When I try to install the package in my virtual environment I get the following build error:
Collecting ...
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369
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Capture screen using FFMPEG on a headless VPS
I need a solution to run a graphical application on a Ubuntu VPS and capture the screen using FFMPEG software.
the steps I tried already:
###Create a virtual desktop
Xvfb :1 -screen 0 1920x1080x24
## ...
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40
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How to have the subtitles occupy full screen for an ogg audio file with an srt subtitles files converted into an mp4 video file?
I can embed an mp4 file from an ogg file with embedded subtitles from an srt file alright, thanks to stack*** forums and other internet resources, in two steps:
First create a black png file for ...
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257
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Stacking two videos with a precise time offset
I'm trying to use FFmpeg to produce a stereoscopic side-by-side video (Full 3D SBS) from a left-right pair of videos.
If the two source videos were perfectly in sync, I could use:
ffmpeg -i left.mp4 -...
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50
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How to prevent messages from clogging terminal?
Recently, I have been programming a small game to run in the Linux Terminal. The game involves running an MP3 file from the terminal. However, when this runs using FFMPEG, it sends messages into the ...
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818
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How to remove unneeded languages from video files using ffmpeg?
I have a number of video files (500+) with lots of audio and subtitle streams for languages that I don't need and would thus like to remove to conserve storage space.
I tinkered around with ffmpeg, ...
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455
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How to copy all FLAC tags using ffmpeg?
I'm using ffmpeg to perform audio filtering on my music library. However, it is not copying all FLAC tags (in particular, it's dropping chapter information).
Copy all tags from one FLAC file to ...
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1
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142
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Chromium cannot read camera: Dequeued v4l2 buffer contains invalid length #561
I installed the v4l2loopback kernel module on my machine and enabled it with sudo modprobe v4l2loopback exclusive_caps=1.
I created a camera on /dev/video0 with the rust bindings and started piping a ...
- 101
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1
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640
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FFMPEG converting FLAC to OPUS with cover image
I got a gigantonormic script to convert my FLACs to OPUS files but I'm struggling with one specific issue. When converting and trying to copy the cover image, it throws an error. Preamble, this is the ...
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1
answer
60
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How to extend sustain in batch wav files?
I have a batch of sound samples which are too short (2.15 sec), and I want to extend the sustain to a total of about 10 seconds, meaning stretch the last 0.50 second of the file to 10 seconds.
I can ...
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410
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Internal Data Stream Error Reading v4l2 Virtual Cameras with Gstreamer Pipeline
I'm using v4l2loopback to create 2 virtual cameras that I can then stream an mp4 into and simultaneously read from those cameras with a gstreamer pipeline as if the mp4 was the video being recorded by ...
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453
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ffmpeg doesn't record RTSP stream
I'm trying to record RTSP stream from Dahua IP camera which is located on 10.10.10.10 (for example purpose), on Windows it works well and on previous ubuntu version I had (18) it was also working well....
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