All Questions
39
questions
0
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answers
70
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 ...
1
vote
0
answers
260
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
0
votes
1
answer
113
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
1
vote
0
answers
299
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
1
answer
435
views
There is a greyscale in my alpha mask I extracted from a .mov file, is there any way to make the alpha mask .mov only white and black?
so what the title says. I've never used ffmpeg before but I really need to extract an alpha mask for a project. The problem is a grey color which should be white so when I merge it with the main video ...
- 13
0
votes
1
answer
648
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
1
vote
0
answers
6k
views
How to convert MOV (with Alpha) to MP4 (with ALpha) - using FFmpeg [closed]
I am trying to convert a MOV (with alpha channel) to WebM and Mp4 (with Alpha channel) using FFmpeg.
The WebM video is coming with the Alpha channel.
But the video is not supported in SAFARI Browser.
...
0
votes
1
answer
651
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
0
votes
1
answer
221
views
FFMpeg seek mkv x265 to x264 start + end generate bad duration and black output
I don't understand if I am missing a parameter or am I wrong to understand the documentation.
I have a program that forces me to use FFmpeg (so I can't use ffprobe). FFMpeg I am using "N-99928-...
- 31
0
votes
0
answers
744
views
Keeping metadata in FFmpeg image sequence to video
When creating a video from an image sequence with FFmpeg, how do I also copy the metadata from the first image in the image sequence (within reason: creation date, GPS coordinates, etc.; maybe not ...
- 111
2
votes
1
answer
1k
views
Why does QuickTime not play a video with CRF of 0, but is happy with 10?
I'm experimenting with video compression using ffmpeg (version 4.2.2), and used this command:
ffmpeg -i old.mp4 -c:v libx264 -crf 0 -preset fast newCrf0.mp4
but the resulting video would not play on ...
- 178
1
vote
1
answer
636
views
ffmpeg MOOV Atom on a ProRes file?
We have been asked by a client to create a ProRes QT file (.mov) but specifically asked to "The moov atom (movie index file) should be placed at the beginning of the file."
I have been reading around ...
- 15
1
vote
1
answer
1k
views
ffmpeg stuck in generating thumbnail of video
I'm currently writing a script to create thumbnails of videos in a folder, but as soon as ffmpeg hits a .mov video, it gets stuck. The videos were taken on an iphone at 4k 60fps and can be played back ...
- 21
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 ...
0
votes
1
answer
1k
views
How can I remove 14 of 16 audio channels from a MOV file using FFmpeg?
I'm new to FFMPEG so I need some help from some professional users.
I have a relative simple task:
I have some MOV files with a single audio track that contains 16 channels. I want to remove the ...
