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Recent questions tagged ffmpeg

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782 views

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ffmpeg - generate video containing scrolling image

I want to generate a video [let's say 800x600] from a 800x10000 still image. The image has to scroll, from top ... a hint? Thanks for your time! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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477 views

1 answer

ffmpeg watermark first 30 second

ffmpeg -i v.3gp -acodec copy -vf "movie=w.png [logo]; [in][logo] overlay=10:main_h-overlay_h-10 [out] ... only first 30 seconds. Any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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499 views

1 answer

ffmpeg - VideoCapture is not working in OpenCV 2.4.2

I recently installed OpenCV 2.4.2 in Ubuntu 12.04. cap = VideoCapture(0) is working. but I can't grab ... avformat.h What's the problem here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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944 views

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ffmpeg - "The encoder 'aac' is experimental but experimental codecs are not enabled"

While converting flv to mp4 conversion using FFMPEG it's showing following error [aac @ 0x2b4b640] The encoder 'aac' is ... you want to use it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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663 views

1 answer

ffmpeg - How to change keyframe interval?

How to set the keyframe interval to 5 seconds using FFmpeg? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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744 views

1 answer

ffmpeg - encode video in reverse?

Does anyone know if it is possible to encode a video using ffmpeg in reverse? (So the resulting video plays in ... is an FLV video. Thank you See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

589 views

1 answer

ffmpeg create blank screen with text video

I would like to create a video consisting of some text. The video will only be 0.5 seconds long. The background ... help me ? Thanks in advance See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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380 views

1 answer

ffmpeg video to opengl texture

I'm trying to render frames grabbed and converted from a video using ffmpeg to an OpenGL texture to be put on ... datenwolf for all your help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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404 views

1 answer

ffmpeg - Simulating TV noise

I have googled a bit but was never able to find an answer. What should be my first approach to simulate ... possible form of the signal? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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755 views

1 answer

ffmpeg - Rotate mp4 videos without re-encoding

I'm looking for a way to rotate videos shot with my Nexus 4 on my Debian Wheezy sytem. The videos are ... am I missing another important point? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

789 views

1 answer

ffmpeg add watermark libx264 width not divisible by 2 (853x480)

I want to add watermark for video. My code: ffmpeg -i final_480p.mov -i watermark480p.png -filter_complex overlay=10: ... .v..). Tks for reading See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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538 views

1 answer

ffmpeg - Multiple side-to-side video streams in one file without transcoding

I am investigating a possibility to store video streams which are coming from few sources already coded in h264 ... one big h264 stream. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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616 views

1 answer

ffmpeg filename output format

When using ffmpeg to output a series of frames as images, the only format I can find documentation for is ... timestamp of the specific frame. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

679 views

1 answer

ffmpeg - Checking keyframe interval?

How can I check keyframe interval of a video file? all I can see in ffmpeg output is: Metadata: metadatacreator : Yet ... , mono, s16p, 64 kb/s See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.1k views

1 answer

ffmpeg - How to dump raw RTSP stream to file?

Is it possible to dump a raw RTSP stream to file and then later decode the file to something playable? Currently ... 2013-04-30 17_18_34.703.mp4 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

569 views

1 answer

ffmpeg moving text drawtext

I'm using ffmpeg library to draw text on video in specific time and i'm success to do that Now i need ... =65" -acodec copy outputVideo.mp4 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

937 views

1 answer

ffmpeg wrong audio file after conversion in AAC

I have a problem with encoding in acc with FFmpeg. I have au mp4 file with aac audio. I tried to copy ... convert from audacity. Thanks a lot See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

927 views

1 answer

ffmpeg command line write output to a text file

I'm using this script for shot detection in ffmpeg. ffprobe -show_frames -of compact=p=0 -f lavfi "movie= ... this? Any help is appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

585 views

1 answer

ffmpeg - how to apply filters without losing quality

Here is a simple request, it has an input, output, and two watermarks. From what I gathered I can't ... watermark without losing video quality? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

634 views

1 answer

ffmpeg - Getting green screen in ffplay: Streaming desktop (DirectX surface) as H264 video over RTP stream using Live555

I'm trying to stream the desktop(DirectX surface in NV12 format) as H264 video over RTP stream using Live555 & Windows ... frame size on H264 MFT out type"); hr = MFSetAttributeR...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

684 views

1 answer

ffmpeg - Live streaming dash content using mp4box

I'm trying to live stream H.264 content to HTML5 using the media source extensions API. The following method ... a never-ending dashed MP4. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

454 views

1 answer

ffmpeg - Superimposing two videos onto a static image?

I have two videos that I'd like to combine into a single video, in which both videos would sit on top of a ... ]:v -map 0:a OutputVideo.m4v See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

545 views

1 answer

ffmpeg - Crop MP3 to first 30 seconds

Original Question I want to be able to generate a new (fully valid) MP3 file from an existing MP3 file to ... suggests, with: -acodec copy See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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