0
votes
0answers
10 views

Improve seeking precision for wma encoded in ffmpeg

Compressed audio formats (like compressed video) have trouble doing precise seeking. Is there something in the ffmpeg encode settings that I can change to make the resulting audio file allow more ...
0
votes
0answers
33 views

Mix arbitrary number of audio files into single stereo audio file using ffmpeg

I'm currently working on a karaoke application and need to merge arbitrary number (from 1 up to 12) input tracks together with a song track into single output audio file that should be stereo. I ...
0
votes
1answer
65 views

Unrecognized option 'b:v' when trying to convert a video

I get "Unrecognized option b:v" when I tried to convert a video. I'm using FFmpeg version SVN-r26402. Here is my error log: Raw Conversion Log Started on 2014-06-29 00:02:02 - 2014 Jun 29 Checking ...
0
votes
1answer
32 views

Using a screen capture program (ffmpeg with uscreencapture in my case) to record a Flash video playing on screen

I'm trying to capture my desktop, precisely a full screen video - think "YouTube video on full screen situation", or if you'd record a programme on iPlayer (or any other content deliverer) - what ...
0
votes
1answer
33 views

Fast-Play 1 Hr. Video (with Audio stream) in 2 min

For a Research Project in brain and cognition we need to show the subjects 1Hr. videos in 2 mins. I understand there is a function in most media players out there to speed up the video. But I'm not ...
0
votes
0answers
38 views

FFplay : How to play multi audio track at the same time?

I'm trying to play a video with multi audio track in it. It's a conversation on three different tracks. At the moment, I'm only able to play one track at a time. I can't find a player that work this ...
0
votes
1answer
24 views

How to replace part of audio in a video using the command line?

Part of a recorded audio contains sensitive information. I want to remove that information while keeping the video and rest of the audio intact. Ideally using command line and being able to exactly ...
0
votes
1answer
74 views

FFmpeg : mixing and setting each volume of a multi audio track file

I'm trying to mix all audio tracks from a multi audio track video file. I did it successfully but I noticed that the first is loud, the second is normal and the third is low. I would like to normalise ...
1
vote
1answer
63 views

ffmpeg: combine two mono live audio stream to single stereo stream

I have two live audio streams, they both are MONO streams. Now I want these two streams to merge in one stream and output to single new stream. I am merging two input streams with following command: ...
2
votes
1answer
33 views

Automated conversion of .dvdmedia(VOBs) to format Plex can handle on a Mac?

I'm super impressed by Plex, and I'd like to convert all my old dvdmedia files into a format that it can understand. I have quite a few of them (the product of a dvd library being ripped to work with ...
0
votes
0answers
40 views

Concatenate video files with mute audio

I am using FFmpeg commands to concatenate five video files. One of the files has only video, no audio. When I concatenate the files, the video is stitched properly but I have a problem with audio: the ...
0
votes
0answers
10 views

No audio with :start-time

Using the :start-time (or --start-time) option with VLC on the command line usually causes no audio to be played. There seem to be "sweet spots" where it does -- e.g. vlc foo.mkv :start-time=601 ...
0
votes
0answers
60 views

gstreamer: stream g726 encoded audio over rtp

I am trying to stream adpcm (G726: bitrate=32kbps, sampling=8000hz), audio from a host to a client through RTP: I have tried following commands from the client(receiver) and the host(sender). Both ...
0
votes
0answers
17 views

Change Audio title from English to Sinhalese using ffmpeg

I insert an extra Sound track in my video file and it works well. ffmpeg -i news.mov -i news.wav -map 0:0 -map 0:1 -map 1:0 -pass 1 -vcodec libx264 -preset fast -b 512k -minrate 512k -maxrate 512k ...
0
votes
1answer
83 views

How to batch multiplex audio and video track files with ffmpeg

I think that everybody knows that problem about downloading 480p & 1080p videos from Youtube, and that the only way available for many Download programs is to download the Video and Audio Tracks ...
0
votes
1answer
70 views

FFmpeg add multiple audio files to video at specific points

I have two audio files, each about 3 minutes long. I want to take the first 10 seconds of each file and add them each to a video file at specific points - 0 seconds and 10 seconds. So the resulting ...
0
votes
1answer
26 views

Sync two movies, frame-accurate?

Given video recordings made on two (or more) cameras such as gopros or keychain cameras, and given a "clapperboard" event in each recording, what is a simple way to trim each recording to start with ...
0
votes
0answers
96 views

ffmpeg - complex filter putting 2 videos side by side results in audio out of sync

We have 2 videos. One is a professionally produced video by an artist that performs a song stopping in certain parts to let the user sing. The second video is a stream that is recorded while the user ...
1
vote
0answers
81 views

Play two files in VLC dummy and give sout parameters to both of them

I want to add multiple files to VLC's web interface. And the commands below do exactly that. Two files are added to the VLC's web interface's playlist. But as you can see, that's not all I wanted - ...
0
votes
0answers
46 views

Audio and video streams merging

I receive two streams. One of them is audio and the second is video. After that i mix them and send like "rtmp" stream. But the problem is video stream falls every 3-4 minutes and i need that "ffmpeg" ...
0
votes
1answer
45 views

FFmpeg map optional (audio) stream

I use this command to produce a file scaled and with an overlay image: ffmpeg -i input.* -i overlay.png -filter_complex "[0:v]...; ...[1:v]overlay=... ... [resultingvideo]" -map "[resultingvideo]" ...
1
vote
0answers
41 views

ffmpeg slow down video and audio leads to garbled audio

I am using this command: ffmpeg -i test-video.mp4 -filter_complex "[0:v]setpts=(2/1)*PTS[v];[0:a]atempo=.5[a]" -map "[v]" -map "[a]" slow-output.mp4 And the audio that comes out is very "digital" ...
0
votes
0answers
79 views

Creating a video with ffmpeg using a remote image file

I'm trying to create a video using ffmpeg, my goal is to put together 1 mp3 and 1 image file which are on a ftp server. When i use a local file as my input image, it works as expected: ffmpeg -loop ...
0
votes
0answers
39 views

FFMPEG - merge videos on different time intervals

I have 3 videos (video1/video2/video3). I would like to play them on different time intervals: video1 plays from 0-15s (video1 with sound, video2/video3 mute) video2 plays from 15-21s (video2 with ...
0
votes
1answer
156 views

FFMPEG H264 split demux a stream video

I've got an H264 video (Stored in an 264 file). With ffplay i see that: [NULL @ 00000000003454a0] start time for stream 0 is not set in estimate_timings _from_pts [mpeg @ 0000000000344560] Could ...
0
votes
2answers
138 views

ffmpeg export multichannel audio Stereo won't play

I am trying to export all audio channels from a multichannel quicktime file with ffmpeg which has the following audio configuration, but am unsure if the command below is correct. All the files look ...
1
vote
0answers
165 views

Conversion from MP4 to WAV results in desync with FFmpeg, but not when using VLC

Converstion to .wav from .mp4 video causes a desynchronization when the conversion is done with FFmpeg, but not when with VLC. I've been trying to figure this out for days now and any help is greatly ...
0
votes
0answers
180 views

Add audio to video using ffmpeg not working properly in android (4.4.2) kitkat

I am trying to mix an audio file to video file. The ffmpeg command I am using for that is written below: ffmpeg -i video.avi -i audio.mp3 -map 0:a:0 -map 1:v:0 -codec copy -shortest output_video.avi ...
0
votes
0answers
63 views

Does ffmpeg version 0.7 support -codec copy option?

I have to use ffmpeg version 0.7.15 to merge video (without audio) and audio file into one video file with audio. I would like to use command ffmpeg without re-encoding. I used this with newer ...
0
votes
1answer
72 views

Ffmpeg Video Segment Remove [duplicate]

I am removing multiple segment from a video using ffmepg I am referring to this link -How can I remove multiple segments from a video using FFmpeg? I am executing below command: String ...
0
votes
1answer
118 views

reduce background noise and optimize the speech from an audio clip using ffmpeg

I extract audio clips from a video file for speech recognition. These videos come from mobile/other handmade devices and hence contain a lot of noise. I want to reduce background noise of the audio so ...
1
vote
1answer
66 views

ffmpeg does not recognize any audio filters

I am trying to reduce noise from the audio files I extracted from videos. The objective is to recognize speech so I was trying to filter out the frequencies above 300 and below 3000hz. I tried to use ...
0
votes
0answers
16 views

ffmpeg audio filter to cleanup gaps/insert silence

I have something of a "lossy" audio input source (directshow). It might, for instance, have data from 0.0 to 1.0 seconds, then not have any from 1.0 to 1.5 seconds, continuing on, etc. IS there any ...
1
vote
1answer
325 views

Record audio and video by using FFmpeg

I tried to record audio and video at the same time by using FFmpeg. However, several problems occurred. Here is my code: ffmpeg -f alsa -ar 24000 -i plughw:1 -acodec aac -strict experimental -f ...
0
votes
0answers
93 views

ffmpeg map_channel mutes the second mono file

I am having trouble with -map_channel options. I am using two seperate scripts (yeah I know I could do this in one script). ffmpeg -threads "16" -i example.mov -acodec pcm_s24le -ar 48000 -ac 1 ...
2
votes
1answer
140 views

Generate sine wave with ffmpeg

I would like to generate an audio file with a sinus wave with ffmpeg. I know there is a sine filter but that's as far as it goes. I tried ffmpeg -filter "sine=48:1:5" -c:a pcms16le test to create ...
0
votes
0answers
31 views

Put audio and video tracks all together

I have one video track (xvid) and two audio tracks (ac3) in three different files, and I want to put them together. I succeeded, but there is a problem. This is the command I use: ffmpeg -i ...
0
votes
0answers
63 views

FFmpeg: Insert a segment from a audio track into another? [duplicate]

Using ffmpeg: How to insert seconds 15 to 20 from "f2.ac3" (5.1) into "f1.mp3" (stereo) at position 44s, thus producing stereo "final.mp3" 5s longer than "f1.mp3", if possible ? final.mp3 = ...
1
vote
2answers
318 views

ffmpeg placing audio at specific location with complex filters [closed]

I have got few input sources and i want to place the audio at specific location in the output Currently the complex filter expression is cutting the original audio and placing it at same location ...
0
votes
1answer
286 views

ffmpeg live smooth streaming stereo to 2 mono channels

I'm trying to stream live smooth streaming using ffmpeg, which I can manage just fine. However, the input audio is a single stereo channel, which I need to split to separate audio feeds, as they are ...
0
votes
1answer
169 views

Ffmpeg add new audio in video (mixing 2 audio)

I want to add an audio to video at specific duration. Now before/after that intended duration, original audio of the video should be playing; and at the intended duration only inserted audio should ...
0
votes
1answer
256 views

FFmpeg add background audio to video but not completely muting the original audio

It is merging, but I don't want to remove the original audio of the video. I want to overlay the audio in the background. Is there a way to achieve this behavior? I am using this command to merge ...
1
vote
1answer
387 views

Add audio at specific time in video using ffmpeg

I want to add an M4A audio of 5s duration to an MP4 video file. I have already tried the -itsoffset command of ffmpeg. ffmpeg -i a.mp4 -itsoffset 00:00:10 -i b.m4a -map 0:0 -map 1:0 -preset ultrafast ...
2
votes
1answer
895 views

FFMPEG: Convert m4a files to mp3 without significant loss of information / quality. Automated bitrate

I have a load of audio files (about 1000) which I want to convert from m4a to mp3 so I can use play them on a CD player which has a USB port. I tried doing something simple like: ffmpeg -i FILE.m4a ...
2
votes
1answer
175 views

Ffmpeg Sync when extracting parts of video

This question can be seen as an extension of this question. I am using the ffmpeg 2.0.1 . The following commands is useful when you want to extract parts of one big video file given time makers. ...
1
vote
2answers
542 views

Ffmpeg Audio Stereo to Mono using only left channel

I use the following command to extract video parts of an '.MTS' record (video). ffmpeg -i 00402.MTS -s 1280x720 -r 25 -ss 0:00:05.38608 -vcodec libxvid -qscale:v 2 -acodec ac3 -ar 48000 -ab 256k -t ...
0
votes
1answer
165 views

Ffmpeg : Audio/Video mixing but no sound

I'm trying to add an audio file to a video file generated from images with FFmpeg. The command i am using on a Debian distrib is this one ffmpeg -r 1 -i edit%0d.jpg outputName.mp4 -i Test.mp3 ...
1
vote
0answers
393 views

FFmpeg audio and video out of sync

I know there's a ton of questions on here about video and audio being out of sync when using ffmpeg, however I couldn't find a single one that solved my problem, so I'm hoping you all can help. I'm ...
1
vote
1answer
154 views

ffmpeg amix dropping audio levels

I am attempting to take one video file and 2 audio files (.mp3 and .wav, though I could do 2 .mp3's - not limited to specific format) and combine them into one video. I have it working with the amix ...
0
votes
1answer
78 views

using ffmpeg to stitch together image files, having troubles with audio synchronization

I'm going to be stitching together images recorded alongside a video, and then use the audio track from the original video. To make sure things work as expected, I run a simple test that splits a ...