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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.
Mike Brown's user avatar
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 ...
Gyan's user avatar
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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 ...
Sean Lynch's user avatar
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)...
Gyan's user avatar
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6 votes
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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 ...
Gyan's user avatar
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5 votes
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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 -...
Gyan's user avatar
  • 33.3k
4 votes
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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 ...
Gyan's user avatar
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4 votes
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.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
Gyan's user avatar
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4 votes
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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 (...
Michael Liebman's user avatar
4 votes
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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
shafi's user avatar
  • 343
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.
Gyan's user avatar
  • 33.3k
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
Gyan's user avatar
  • 33.3k
4 votes
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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 ...
Jason Conrad's user avatar
  • 4,504
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] [...
Duvrai's user avatar
  • 803
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 ...
Gyan's user avatar
  • 33.3k
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 ...
vjgalaxy's user avatar
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 ...
masterxilo's user avatar
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 ...
Gyan's user avatar
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3 votes
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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 ...
Gyan's user avatar
  • 33.3k
3 votes
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how to use h264_omx on RaspberryPi

The first priority here is to determine the bottleneck, particularly on the encoding end first, then moving on elsewhere. This is noted by the comment on the choppy video stream, indicating frame-...
Dennis Mungai's user avatar
3 votes
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Why can't my video play from where I drag the playback bar?

video1 has a very short keyframe interval - it has a keyframe every few frames. video2 doesn't. Some players have the ability to decode upto non-KF silently and start playing from seek point. If yours ...
Gyan's user avatar
  • 33.3k
3 votes
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Does increasing the framerate while not changing the content affects compression quality?

This depends on the specific encoder, and the compression standard, by itself, may not have anything to say about it. x264, which encodes to H.264, takes frame duration, into account, in its ...
Gyan's user avatar
  • 33.3k
3 votes
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Lossless color compression

Without knowing the video properties, my generic answer is ffmpeg -i in.mp4 -vf geq=lum='p(X,Y)':cb=128:cr=128 out.mp4 This will reset the color information, but pass the luma plane intact. Add -crf ...
Gyan's user avatar
  • 33.3k
3 votes
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AAC with no global headers is currently not supported

I assume you're the same poster as at ffmpeg-user who posted this. .aac stores a raw bitstream and the demuxer has no facility to extract the stream parameters as extradata. So, you can try streaming ...
Gyan's user avatar
  • 33.3k
3 votes

Why is my video file so large when there isn't any video?

You have 37 minutes and 14 seconds of audio, so it's going to be at least as large as the original audio file (36Mb) plus one image and a few bytes for each frame saying "the image has not ...
Alexis Wilke's user avatar
2 votes

How does YouTube encode my uploads and what codec should I use to upload?

Your question is "How does YouTube encode my uploads and what codec should I use to upload?". Digging deeper into your question I see: "Should I adjust my own encoding to "play nice" with Youtube's ...
Rob's user avatar
  • 847
2 votes
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Canon Vixia HF R600 - MP4 vs AVCHD

Generally, MP4 is better for compatibility, whereas AVCHD provides the better quality. MP4 (which by the way can mean a million different things, in this case it probably refers to MPEG-4 Part 14) ...
MoritzLost's user avatar
  • 5,412
2 votes
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best alternative to QuickTime .mov

Apple is dropping support for the player, so no new releases, but the format remains and can be decoded by recent versions of CC without needing Quicktime to be installed. See http://blogs.adobe.com/...
Gyan's user avatar
  • 33.3k

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