All Questions
19
questions
0
votes
1
answer
1k
views
ffmpeg with libfdk_aac: AAC-HE-V2 profile doesn't work for mono sound?
Whenever I use ffmpeg with libfdk_aac to convert a piece of audio to AAC, I noticed the aac_he_v2 profile does not work if the source audio is mono. For example:
ffmpeg -i mono.wav -c:a libfdk_aac -...
- 1,172
1
vote
1
answer
1k
views
FFmpeg audio normalization from multi-channel audio to stereo to fix the quiet dialogues
When playing 5.1 surround sound audio on stereo, the dialogues come out quiet low but the other sound effect comes out heavily loud. Fortunately, FFmpeg already has built-in filters to fix this issue ...
- 119
0
votes
1
answer
1k
views
How can I properly normalise surround audio to stereo(2 channels)
This question has been asked before but my query is different and more specific. In MPV player I use this command af=format=channels=stereo,dynaudnorm which is like live normalising the audio. However,...
- 119
2
votes
1
answer
2k
views
ffmpeg combining both -af and -filter_complex filters (use left track to create mono only track *and* normalise audio)
I have lossless video captures of videotapes that I'm going to convert to FFV1 and FLAC. For a select few tapes, in the process, I also need to convert the audio to mono (only the left track exists as ...
0
votes
1
answer
417
views
How to use FFMPEG to stack two equirectangular images to top/bottom format?
This command line does what I need, but it is a little tricky...
ffmpeg -i left.jpg -i right.jpg -filter_complex "[0]scale=iw:ih*2[grande],[grande][0]overlay=x=0:y=0[base],[base][1]overlay=x=0:y=...
- 435
0
votes
0
answers
2k
views
What is the recommended way to downmix 5.1 or 7.1 to 2.1?
I've been trying to downmix a 5.1 DTS HD-MA (specifically arranged as C L R Ls Rs LFE) track into 2.1 (with LFE), but I'm not sure of the recommended/standard way that doesn't mess up the audio.
I ...
0
votes
1
answer
1k
views
ffmpeg libtwolame mp2 how set options like mode or copyright
How I can change the audio mode (and other option flags) for libtwolame (mp2) encoder in ffmpeg?
I've tried with
ffmpeg -f jack -i ffmpeg -r 48000 -c:a mp2 -mode "m" -b:a 128k
and also
-mode 'm'
-...
0
votes
1
answer
1k
views
ffmpeg take channels 7+8 and make a stereo
I have a 8 audio track mov file which I want to encode to mp4 using ffmpeg BUT take the tracks 7+8 and put them as stereo with 320k and 48KHz to that mp4.
My line is this:
ffmpeg -i %source% -map 0:0 ...
- 15
0
votes
1
answer
1k
views
Converting image sequence to stereo H.264 video
I have an image sequence of JPG files exported from Blender. I would like to create a stereo side-by-side (left/right) H.264 video using ffmpeg using libx264.
My image sequence is as follows:
...
- 2,307
1
vote
1
answer
3k
views
Is LFE channel completely lost when downmixing 5.1 to stereo using ffmpeg?
so, I've been reading a lot about downmixing 5.1 to stereo, but as documentation provides, it creates L and R channels, so is the LFE channel being included down the mix? Is it completely lost? I've ...
- 13
2
votes
1
answer
2k
views
flac to "stereo mp3" not "joint stereo" using ffmpeg
After reading and trying contents of the post talking about flac to mp3 conversion, I didn't find the solution
I try this command again and again for converting flac to "stereo" mp3:
ffmpeg -i ...
- 131
0
votes
1
answer
1k
views
How to set the version of an output MP3 file in FFmpeg
I want to split a stereo MP3 file into two mono MP3 files using FFmpeg such that each of the mono files is MPEG-1 Layer 3 Version 1:
I use this command:
ffmpeg -i input.mp3 -map_channel 0.0.0 left....
- 131
2
votes
3
answers
3k
views
FFMPEG: Amplify one channel of audio file
Okay, so I have one audio file that's in .mp3 and need to amplify only left channel. I have found out how to do i on the whole file using this command:
ffmpeg -i input.wav -af "volume=1.5" output....
- 45
0
votes
1
answer
1k
views
ffmpeg downmix to 5.1+2.0 from 5.1
I need output of 5.1 + 2.0 (PCM, 6 mono tracks + 1 stereo track) from a 5.1 source. This means I need:
first 6 channels input --> ch1, 2, 3, 4, 5, 6 (mono tracks)
+
first 6 channels --> ch7-8 (stereo ...
- 3
0
votes
1
answer
939
views
ffmpeg stereo3d not working with scale
I used this command to recode stereo video:
ffmpeg -i seav.mp4 -vf stereo3d=abl:sbsl -c:a copy seah.mp4
But when I add scale it fails:
ffmpeg -i seav.mp4 -vf stereo3d=abl:sbsl scale=2560x720 -c:a ...
- 103