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Recent questions tagged FFmpeg

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ffmpeg - Decoding Raw H264 stream in android?

I have a project where I have been asked to display a video stream in android, the stream is raw H.264 and ... Android version is not an issue. See Question&Answers more detail:os...

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

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ffmpeg - Every 30 seconds is to cut a video 3s

I have a 30 minute video. I want to skip 3 seconds every 30 seconds. And continue to the end of the ... ending video Please help me write it See Question&Answers more detail:os...

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

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ffmpeg - Using ffprobe to check if file is audio or video only

Is there an ffprobe command I can run to see if an mov file that I have is audio-only or contains video as ... are audio dubs and some of which are full videos. Question&Answers:os...

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

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ffmpeg for a android (using tutorial: "ffmpeg and Android.mk")

I am trying to compile ffmpeg for a android. I have found several posts on this theme but non of these seems ... -android [3] http://ffmpeg.org/download.html Question&Answers:os...

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

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1.1k views

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ffmpeg in a bash pipe

I have a rmvb file path list, and want to convert this files to mp4 files. So I hope to use bash pipeline ... pipe exits. So, does ffmpeg affect the bash pipe? Question&Answers:os...

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

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ffmpeg video won't play in certain players

I'm generating a video in /folder/ from a stack of images in /folder/tmp/ using the following command ... .com/questions/65843863/ffmpeg-video-wont-play-in-certain-players...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ffmpeg - How to merge 2 streams and send the stream to youtube?

Trying to merge 2 rtmp url from one youtube account and sending the merged stream to another youtube account Details: We ... /how-to-merge-2-streams-and-send-the-stream-to-youtube...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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ffmpeg subtitles command not showing text, tried with .srt and .ass file. with and without -filter_complex same result

I have tried almost every suggestion on how to make subtitles work, in windows it works all the time, on android it ... command-not-showing-text-tried-with-srt-and-ass-file-with-a...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ffmpeg - Overlaying a transparent webm on an MP4 freezes at the start sometimes

I'm currently using the command ffmpeg -i mainvideo.mp4 -vcodec libvpx -i myoverlay.webm -filter_complex "overlay = 5: ... (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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ffmpeg opperation not permtted on rtmp

I am trying to make a internet radio using ffmpeg. I have a folder full of mp3 and have a 5sec ... ://stackoverflow.com/questions/65863337/ffmpeg-opperation-not-permtted-on-rtmp...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ffmpeg - what is the meaning of the v4l2-ctl --list-device?

The High level Problem: I have a custom multi-camera array that I have attached to a Raspberry Pi via some USB ... /65865266/what-is-the-meaning-of-the-v4l2-ctl-list-device...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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ffmpeg combine multiple images - output video incorrect xfade transition time, and total length

I want to merge 5 images with transition at specific times 4.00, 10.0, 16.0, 22.0, with a ... 65867640/ffmpeg-combine-multiple-images-output-video-incorrect-xfade-transition-time-a...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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ffmpeg xfade custom transition expression - Fetch pixel value at specifc x, y from vid1, vid2?

I am using xfade with transition=custom, and trying to build expression. I am referring to official documentation ... transition-expression-fetch-pixel-value-at-specifc-x-y-fr...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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ffmpeg - How to call AAC audio streaming functionality via ssh

I have a USB audio dongle connected to the USB port on the QNAP NAS. I have on the NAS a script ... com/questions/65889945/how-to-call-aac-audio-streaming-functionality-via-ssh...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.8k views

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ffmpeg - MOOV atom not found - is there a way how to extract the audio from corrupted mp4?

I'm trying to recover mp4 video file. Having a video would be nice, having an audio is crucial. I've recorded the ... -is-there-a-way-how-to-extract-the-audio-from-corrupted-mp4...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

1 answer

ffmpeg - How to read a video stream(H.264) bitrate via ffprobe if the video is VBR

if the video stream is VBR, which means the bitrate is variable, so how to read the bitrate via ffprobe? How to get ... -a-video-streamh-264-bitrate-via-ffprobe-if-the-video-is-vbr...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

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ffmpeg - How to set H264 NVENC encoding parameters to output high-quality video stream?

I use NVENC (nvEncodeAPI) interface hardware encoding H264, and then RTMP to stream out, when using ffplay to ... h264-nvenc-encoding-parameters-to-output-high-quality-video-stream...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

1 answer

ffmpeg - Concatenating two.mov files results in identical sized file

I try to concatenate two video files a.mov & b.mov on Win 10 using ffmpeg with the following command ... /65904567/concatenating-two-mov-files-results-in-identical-sized-file...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

1 answer

ffmpeg - overlay line chart over video clip, having that line go up or down based on excel time series data

I have a question, if this can be done with ffmpeg. If not, please suggest a plugin or a tool. My basic need is, ... -over-video-clip-having-that-line-go-up-or-down-based-on-exce...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

1 answer

ffmpeg windows av_interleaved_write_frame(): Operation not permitted failure

I'm trying to share my computer's camera with the remote computer. Local machine is linux(ubuntu 20. ... /ffmpeg-windows-av-interleaved-write-frame-operation-not-permitted-failure...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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ffmpeg - make a seemless loop

I'm trying to make a seamless loop in ffmpeg The video has a length of 10 Seconds. This is the source ... :https://stackoverflow.com/questions/65911012/ffmpeg-make-a-seemless-loop...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

1 answer

ffmpeg - burning subtitles onto mp4, such that they always show, and cannot be turned off

I have successfully create a command line that allows subtitles to be displayed, I can see them when I select the track ... -mp4-such-that-they-always-show-and-cannot-be-turned-off...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.3k views

1 answer

ffmpeg failed to drawbox and set volume

I don't know what is wrong in my command with ffmpeg. Lets say I have a video and I want to make ... //stackoverflow.com/questions/65914491/ffmpeg-failed-to-drawbox-and-set-volume...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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ffmpeg filter_complex trim out-sync

command line: ffmpeg -i <INPUT> -filter-complex "<FILTER_COMPLEX>" -map "[ofa]" -map "[ofv]" -acodec ... ://stackoverflow.com/questions/65914729/ffmpeg-filter-complex-trim-out-sync...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.1k views

1 answer

ffmpeg - Bash script to recursive find and convert movies

in my large movie collection I would like to search for movies with the primary (first) audio track with ... /questions/65617649/bash-script-to-recursive-find-and-convert-movies...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.2k views

1 answer

ffmpeg - How to speed up a video in order to shorten its length and embed a timestamp to represent time as it was recorded?

I have a video recorded at 5 fps that I want to speed up to 30 fps to shorten it. That is simple enough as: ... -a-video-in-order-to-shorten-its-length-and-embed-a-timestamp-to...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.1k views

1 answer

ffmpeg - Recieve audio data from RTP... filtered by port

I am having some trouble with recieving RTP stream using ffmpeg, This is the SDP I'm using: v=0 o=- ... .com/questions/65670855/recieve-audio-data-from-rtp-filtered-by-port...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

1 answer

ffmpeg, libav: Recording RTSP at reduced frame rate without re-encoding

I'm trying to record a chunk of an RTSP video stream (say 5 minutes) to an mp4 file. The RTSP ... 65601879/ffmpeg-libav-recording-rtsp-at-reduced-frame-rate-without-re-encoding...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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