12
votes
Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
The usual solution for this situation: -fflags +genpts
It should eliminate the warning, but there's no guarantee your sync issues will be solved.
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8
votes
Accepted
ffmpeg: how to convert to DNxHR in Windows 10?
There's a single decoder/encoder which reads/converts to both DNxHD and DNxHR.
You have to set the correct profile switch. Available options are
dnxhd E..V....
dnxhr_444 ...
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7
votes
Is there a video type for vector animation?
SVG supports animation using JavaScript and the animate element. That means using a browser or embeddable renderer like WebKit to render it, though.
Older games often used their own vector animation ...
- 171
6
votes
How can encode video with images like these (overlay a video over a fixed image) with ffmpeg?
To overlay a half-sized version of a video in the center of an image, use
ffmpeg -loop 1 -i image -i video
-filter_complex "[1]scale=iw/2:-1[ovrl];
[0][ovrl]overlay=(main_w-overlay_w)...
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6
votes
Accepted
Understanding containers and codecs
MPEG-4 is not a container specification. It's a suite of specifications. Parts 12 and 14 define containers (MP4). Part 2 defines a video codec, whose encoder implementations are DivX and Xvid. Part 10 ...
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4
votes
Accepted
Streamable Container for HEVC (H.265)
MPEG -TS. See here:
All MPEG-2 TS operations from GPAC (client and MP42TS) are supported on
HEVC. MP42TS can be used to generate TS files usable for DASH or for
injection in modulation ...
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4
votes
Accepted
Do a sort of HEAC - High Efficiency Audio Codec exists?
I think HE-AAC fits that bill.
High-Efficiency Advanced Audio Coding (HE-AAC) is an audio coding
format for lossy data compression of digital audio defined as an
MPEG-4 Audio profile in ISO/IEC ...
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4
votes
Accepted
.mkv file not playing in HEVC/H.265 supported player
Both files that don't play feature Opus as the audio codec. As per this site, Opus is not one of the supported audio codecs.
Transcode the audio:
ffmpeg -i in.mkv -c:v copy out.mkv
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4
votes
Accepted
What does codec stand for?
One of the earliest articles in the IEEE database that uses the term, defines it as "coders and decoders."
However, newer material does not seem to be consistent. One of the Wikipedia page's sources (...
- 2,405
4
votes
Accepted
Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
this worked for me as an option to ffmpeg: -use_wallclock_as_timestamps 1
- 323
4
votes
Accepted
Is MP4 a valid or common container for ProRes?
No, officially, ProRes is not a registered codec for the ISOBMFF family, of which MP4 is a member.
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4
votes
Accepted
Smallest Possible Video File in H.264 Format
A one frame H264 stream would have to consist of an intra-coded frame, so there is a size floor in effect.
This ffmpeg command produces a 1.7 kiB file
ffmpeg -f lavfi -i color=blue:s=1280x720 -...
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4
votes
How to make video play with correct aspect ratio
For a H264 stream, use the h264_metadata bitstream filter
ffmpeg -i in.mp4 -c copy -bsf:v "h264_metadata=sample_aspect_ratio=4/3" out.mp4
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4
votes
Accepted
How can I find out which chroma subsampling (if any) is used in a video file?
Mediainfo is a free, open source, cross-platform solution, available in 37 languages. https://en.m.wikipedia.org/wiki/MediaInfo
When run from the command line it outputs chrome subsampling info by ...
- 4,444
4
votes
How can I find out which chroma subsampling (if any) is used in a video file?
Using the ffprobe command (part of FFmpeg, also a command line tool)
ffprobe -show_entries stream=pix_fmt <VIDEO FILE>
The output will look like this:
...
[STREAM]
pix_fmt=yuv420p
[/STREAM]
[...
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3
votes
Reduce render file size in After Effects
You need to change the encoding settings. By default, AE uses the AVI animation codec, which is very good at retaining quality but creates incredibly large files. Using an intermediary codec like ...
- 1,004
3
votes
ffv1 realtime capture throws out a lot of frame dropped messages!
I get the same result with your commands, however if I skip the pixel format conversion and use the input pixel format 'bgr0', then except for an initial frame drop, I get no further drops. Note that ...
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3
votes
Accepted
ffmpeg bgr vs rgb and other similiar pixel formats
The order of the components in RGB32 seems to do with endianness:
PIX_FMT_RGB32 is handled in an endian-specific manner. An RGBA color
is put together as: (A << 24) | (R << 16) | (G &...
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3
votes
ffmpeg bgr vs rgb and other similiar pixel formats
While I always guessed that the big / little endian was more a matter of patents rather than performance,
Nope little endian was developed as a performance optimization whern moving to multi byte ...
- 1,060
3
votes
Accepted
Predict file size of a Huffyuv codec video stream
The answer is No. Besides the frame dimensions, there's the matter of content complexity. Without scanning the video and doing a first-pass as it were, it's not possible to predict the output size. A ...
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3
votes
VLC Alternative for fine review media with possibly frames control and detailed codec informations
I haven't used VLC as my primary player since 2007. I switched over initially to KMPlayer and then Potplayer. Potplayer allows fairly flexible splitter and codec assignment for decoding. It also ...
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3
votes
How to encode Apple ProRes on Windows or Linux?
This is the command line I have used to encode ProRes 4444. If you do not include -bits_per_mb you will get low res results in Windows 10. Many posts do not mention this little aspect.
ffmpeg -y -f ...
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3
votes
Is there a video type for vector animation?
Here is some research about this topic:
Resolution Independent 2D Cartoon Video Conversion
https://www.researchgate.net/publication/305390110_Resolution_Independent_2D_Cartoon_Video_Conversion
Video ...
- 131
3
votes
Accepted
Video format can't be played or converted
Use this ffmpeg* command:
ffmpeg -i "20151105-175532.dad" -c:v copy "20151105-175532.mp4"
*get 32-bit static build.
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3
votes
Record desktop at 1080p60 in high quality
Try lossless encoding with ffmpeg
First, with YUV444P
ffmpeg -f gdigrab -framerate 60 -i desktop -crf 0 -pix_fmt yuv444p -preset ultrafast yuv-cap.mp4
If not clear enough,
ffmpeg -f gdigrab -...
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3
votes
Is there something like nvenc for free codecs (VP8/9)?
There is a hardware-accelerated VP8 encoder recently released by the University of Milan. Source and standalone binary for 64-bit Linux and compute 3.5, 5.0 and 5.2 capable NVidia GPU cards available ...
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3
votes
ffmpeg convert mp4 to mov with dnxhd codec
Your output has to match one of the requested profiles.
For the 5th profile listed,
[dnxhd @ 0000000002be23a0] Frame size: 1920x1080p; bitrate: 115Mbps; pixel format: yuv422p; framerate: 24000/1001
...
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3
votes
Accepted
encoding with ffmpeg libx265 -pix_fmt gray gives unplayable vid
Plays fine here in VLC, ffplay and Potplayer. Doesn't play with mplayer. Its H265 decoder probably doesn't support gray.
Workaround is to store it as YUV420P after discarding the chroma.
ffmpeg -i ...
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