All Questions
21
questions with no upvoted or accepted answers
4
votes
0
answers
2k
views
How do I extract a QuickTime text track using FFMPEG?
I have a .mov container with a QuickTime text track which QuickTime uses to display chapter markers. In the QuickTime 7 Pro User's Guide, the description for how to do this is in Editing and Authoring ...
- 425
4
votes
1
answer
4k
views
How to accurately split and combine videos with ffmpeg respecting inpoint/outpoint
I'm learning how to split and combine videos with ffmpeg. Presently I'm practicing on a 799 KB MP4, one_through_ten-timestamped.mp4, where each frame has a burnt-in "frame number" (up to frame 40, the ...
- 425
3
votes
0
answers
711
views
Why doesn't my audio work in Quicktime (but does in other players) when combining an mp3 and video file using FFmpeg?
I'm trying to denoise the audio in a video. I've determined that this isn't really possible in ffmpeg, so I've extracted the audio from the video this way.
$ ffmpeg -i found1-1.mp4 audio.mp3
$ ffmpeg ...
- 1,014
1
vote
0
answers
271
views
Stream an MP4 file via HTTP in a QuickTime-compatible format using FFmpeg
QuickTime supports streaming from an HTTP server, for instance try opening https://ia801307.us.archive.org/18/items/kontikipart2/kontikipart2.mp4 via File -> Open Location.
However, streaming the ...
- 11
1
vote
0
answers
311
views
ffmpeg last frame freezes, audio keeps playing
I'm using fffmpeg to cut an H.264 video into specific shots. I need it to be frame accurate, which isnt a problem if I only encode video (now that I know how to calculate the ms from the number of ...
- 11
1
vote
0
answers
259
views
How can I imitate the video codec of a Canon DSLR?
I have a Canon EOS Rebel SL1 (100D) with a stuck pixel in the screen that really bothers me out. I'm trying to play one of these "dead pixel fixer" videos on the camera in order to bring it to life ...
1
vote
1
answer
627
views
Quicktime .mov - Specify a Movie Header timescale of 24000
When I run my 24fps Quicktime mov files through an FFmpeg transcode they are coming out with a Movie Header timescale of 1000, when the source file has a timescale of 24000. This low timescale value ...
- 315
1
vote
1
answer
935
views
Trimming videos - quicktime vs. mplayer/ffmpeg stack
I have several mp4 video files (H.264, AAC) from which I want to trim a few seconds at the beginning and the end. I used Quicktime Player 7 and MPEG Streamclip for this. The generated files are a bit ...
- 611
1
vote
0
answers
690
views
what is missing in this ffmpeg statement to create a working video conversion
I want to convert videos to a format that my camera reads with ffmpeg.
I have some sample videos from the camera and analyzed them with
mplayer -frames 0 -identify DSCN0001.mov
and with
ffprobe ...
- 1,978
1
vote
0
answers
2k
views
.MOV video compressed with PNG has no alpha channel
I have a QuickTime file .mov with alpha channel compressed with PNG codec. What I need is to create smaller version of this file using ffmpeg. Everything works except new mov has no alpha (Adobe After ...
- 21
1
vote
2
answers
4k
views
ffmpeg - creating DNxHD MFX files with alphas
I'm struggling with something in FFMpeg at the moment...
I'm trying to make DNxHD 1080p/24, 36Mb/s MXF files from a sequence of PNG files.
My current command-line is:
ffmpeg -y -f image2 -i /tmp/...
- 1,211
0
votes
0
answers
74
views
ffmpeg png to mov keep exact colors
When I convert a PNG sequence to a h264 (yuv420p) movie and read the color values via FFmpeg's rawvideo pipe output, the values on each pixel is slightly modified.
This is how I write my image:
import ...
0
votes
1
answer
114
views
Enabling all sound tracks in a .mov via ffmpeg
I run the following command:
ffmpeg -i "SToutput.wav" -filter_complex "[0:a]channelsplit=channel_layout=stereo[left][right]" -map "[left]" -map "[right]" -c:a ...
- 11
0
votes
1
answer
652
views
Mp4 file that plays fine on Windows Quicktime but video frames not in order and out of sync with audio in VLC
Someone has sent me a video that I wish to embed into a presentation I'm building. However, it doesn't play back as the author intended either embedded or standalone. I suspect was encoded on a Mac, ...
- 1
0
votes
1
answer
657
views
What ffmpeg command would convert a video for iPad/iPhone in 2021?
One of the answers almost a year ago was to use the following command:
ffmpeg -i input.mp4 -vcodec libx264 -profile:v main -level 3.1 -preset medium -crf 23 -x264-params ref=4 -acodec copy -movflags +...
- 1