Ffmpeg swap streams They play fine in VLC/QuickTime if you change the extension to . This assumes each individual audio stream in in. You will have to add the -map I have 1-5 input streams, each uploading on a slightly different time offset. mp4 The -map option allows you to manually select streams / tracks. When I use the -stream_loop option (either with -1 or an arbitrary number of repetitions), the input file is not looped, just played once:. mkv -map 0 -c copy -c:a:1 copy -c:a:0 copy output. For example, you can change the bitrate of the video using the -b option: ffmpeg -guess_layout_max 0 -y -f dshow -video_size 3440x1440 -rtbufsize 2147. FFmpeg by default only picks one video, audio and subtitle track (if they are present) from among the sources. This other audio stream originates from the same source but is ran through an audio processor that adds a fixed delay. mkv -y – A global option to overwrite the output file if it already exists. 3F2M/LFE (3 Front, 2 Middle), which is in ffmpeg known as "5. Supposing the input video has 2 audio streams, and the default audio stream is 0, we need to . mp4 -ss 00:04:00 -i audio. Previous message (by thread): [FFmpeg-cvslog] avformat/iamf: document the expandable channel layouts Next message (by thread): [FFmpeg-cvslog] avformat/flvdec: set Opus sample rate Messages sorted by: I'm currently doing a stream that is supposed to display correctly within Flowplayer. -map 0:v – Designate the video stream(s) from the first input as a source for the output file. 8. 5 seconds behind the one from the cam named second. mp4 -filter_complex "[0:a]amerge=inputs=4[a]" -ac 1 -map 0:v -map "[a]" -c:v copy out. 48M -pixel_format nv12 -framerate 200 ^ -i video="Video How to tell ffmpeg to copy all streams except one audio stream (to encode)? 1 (ffmpeg - Audio) I am making this on the spot, so it could be trash, but you can try mapping all the audio streams with -map 0:a? and then converting the audio streams one by one with -c:a:0 aac -b:a:0 ---k, -c:a:1 aac -b:a:1 ---k and -c:a:2 aac -b:a:2 ---k writing down the desired bitrates of the streams (if you don't remember wich stream comes first, then analyze the file by ffmpeg -i input. m4a -vcodec copy -map 0:0 -map 1:0 output. FFMpeg Video Overlay with Delayed Audio and Video in Background Video. Mono. mkv to . ffmpeg. 22 was released on 2023-10-29. FFMpeg: How this works for me: ffmpeg -y -i Source. ; This example uses -c:v copy to stream copy (mux) FFmpeg 2. Gyan has clarified that if you have a file with exactly one video and one audio stream, -map 0:v -map 0:a will function equivalently to -map 0:1 -map 0:0. mp4 has audio. To fix this, I'm trying to remap channels using ffmpeg in terminal, but I'm not getting something right. This example will loop a single image over and over but the -t 30 will limit the output duration to 30 seconds:. 97 /* polls for possible required screen refresh at least this often, should be less than 1/fps */ FFmpeg assumes the option names in the order they are declared in the source code. 389k 80 80 gold badges 591 591 silver badges 629 629 bronze badges. avi The stream will be composed of alternating still images and video clips. You don't want to encode twice, that wastes cpu. mp4. Tested with master as of 2021-04-13 failed [flac @ 0x7f3d89d63c00] thread_get_buffer() failed [flac @ 0x7ff4f6ace040] switching bps mid-stream is not supported [flac @ 0x7ff4f6ace040] decode_frame We seem to have found similar or the same issue with Jitsi/Jibri on Debian 10, so far as regards the memory usage of ffmpeg increasing indefinitely until all real memory and swap is used until the kernel OOM killer kills the ffmpeg processes. Share. -c:v copy – Stream copy the video. Flags must be cleared by the user once the event has been handled. All the -c:a:1 copy does is designate the codec mode for I want to replace the second audio stream (0:2) in a video file that has two audio streams and give it a label if possible. Recording live stream music and videos is a highly sought-after capability for content creators, archivists, and enthusiasts. portnoy at kaltura. The -loop option is specific to the image file demuxer and gif muxer, so it can't be used for typical video files. Now lets break it down. Nami. mp4 \ -re -stream_loop -1 You can use the -map option (full documentation) to select specific input streams and map them to your output. When ffmpeg one stops, with maybe eight seconds left in the last segment (assuming ffmpeg two is keeping up, and 10 second segments): -map 0 to copy all streams from the input #0 (video)-map 1:a to include all audio streams from input#1 file (audio1)-map 2:a to include all audio streams from input#2 file (audio2) and so on. Next message: [FFmpeg-user] Switching live streams without interruption? Messages sorted by: I’ve been thinking: For gapless playback, it’s probably best to have two video streams running, and then switch between these with i have the publisher/controller/loop until live all setup/automated with ffmpeg providing 4 live streams which rotate this allows me to have a ‘main stream’ in which the wowza server rotates content on a time based schedule. mp4 if you want an mp4. Here is what I think could work: At any time, simultaneously play back two video streams using ffmpeg -re (one of the video streams is actually a looping still image). The tee pseudo-muxer was added to ffmpeg on 2013-02-03, and allows you to duplicate the output to multiple files with a single instance of ffmpeg. 5. FFmpeg Mixing new Audio with video repeat audio until video finishes. Then: How to swap audio streams in a video with ffmpeg. Please mark any answers that fixed your problems so others can find the solutions. stream webcam with nodejs ffmpeg. If your output container can handle (almost) any codec – like MKV – then you can simply copy both audio and video streams: ffmpeg -i video. [FFmpeg-cvslog] avformat/iamfdec: swap back and side streams if both are present James Almer git at videolan. mp4 This is the stream mappings so I have no idea why it isn't mapping correctly? ffmpeg -i "original video file" -i "video file I want to insert" -map_metadata 0 -map 0 -map -0:v:0 -map 1:v:0 output. Here is an explanation of the parameters – The accepted answer is an excellent explanation of ffmpeg's flexible stream selection using the -map option. However, the documentation linked above also describes a simpler syntax to do what the questioner asks, without -map:. Stream 1 to 10 is for original language and stream 11 to 18 is for French version. demuxing: may be set by the demuxer in avformat_open_input(), avformat_find_stream_info() and av_read_frame(). 1). Ffmpeg instance one generates a segmented stream for five minutes, then exits. What follows the -vf in an ffmpeg command line is a filtergraph description. ffmpeg -i input. 1. net core web api project running a background service that when I send the streaming information to it, it launches FFMpeg to stream a USB webcam. answered Jul 23, 2013 at 22:46. 0. Copying multiple audio-streams with ffmpeg. mkv -map 0:v -c:v copy -map 0:a -c:a copy -map 0:a -strict -2 -c:a aac out. mp4 Now, only the audio gets encoded in order to match the container. mp4 \ -re -stream_loop -1 -fflags +genpts -i 02. Here's the deal : I have a . jpg file (overwrite) 2. I already was capable to swap the streams by using ffmpeg by using this command ffmpeg -i test. ), your problem is that any break in the stream will disconnect clients, or at least Use FFmpeg: ffmpeg -i input. ffmpeg matches no streams. Previous message My problem is that currently, if the main stream is stopped, I have to stop the FFmpeg CLI process that restreams to Wowza and start another with a new input source (the backup stream). In the meantime, as a workaround, I secured the port on the operating system with the local firewall so only connections from whitelisted IPs get accepted. MOV file witch contains 18 audio streams (for 7. Unless I am mistaken (I have only done this with audio, icecast, etc. I know that you can accept multiple input streams into ffmpeg, and I want to switch between the input streams to create a consistent, single, seamless output. mov -vn -i video2_wAudio. The actual number of audio streams (there is usually one channel per stream) per file isn't known until I'm using ffmpeg. This is causing an issue with my surround sound setup. Tee pseudo-muxer. mp3 -c copy -shortest output. wav -c:v copy -map 0:v:0 To re-order streams using FFmpeg, use the map command. 7. answered Jun On Sat, 25 Oct 2014, Felix E. mp4 -map 0:v:0? -map 0:a:1? -map 0:a:0? -c copy output. Streaming ffmpeg output over HTTP. wav pan audio filter Flags indicating events happening on the stream, a combination of AVSTREAM_EVENT_FLAG_*. The video from the card comes with an audio stream, but I want to replace the audio stream with another. 0 left. mp4 With amix: ffmpeg -i in. and-shortest to crop the output to the shortest input. But it can be used to infinitely loop a single image or a series of images. wav -c copy output. ts extension). You can influence the quality of the output file using various options. Brief Contents Introduction 12 1. e. avi -i second. In the resulting file, the stream from the cam named first will always be about 0. The desired outcome is to somehow have ffmpeg get the count of audio channel, use the number in the command line to amerge those into one single audio channel. wav -acodec copy -vcodec copy -map 0:v:0 -map 1:a:0 final_video. It is the latest stable FFmpeg release from the 2. If you want to use the 0:a syntax, if you have more than one audio for example you must address them individually, otherwise FFmpeg will group them when reordering. Use a H. Follow edited Dec 29, 2015 at 16:35. 3. Streaming video frames from server with ffmpeg. mkv Replacing audio stream. mp4 -stream_loop -1 : to loop infinity of video input stream-map 0:v:0 : pick the video of the first input stream-map 1:a:0 : pick the audio of the second input stream Using ffmpeg there are several methods that I know of to go from stereo to two individual mono files, or two mono streams in one file: stereo to 2 mono outputs-map_channel option ffmpeg -i stereo. 4. With the power of FFmpeg on Linux, capturing these live streams directly from the command line becomes not I am attempting to use ffmpeg for a number of files. av_channel_layout_check() Generated on Switch webcams every 30 seconds and live stream. mov -c:a copy -c:v copy video1_audioFromVideo2. mkv (all) streams are mapped as per in the input file. mkv The audio will be from the 4 minute position (-ss 00:04:00) as requested in the question. 8 release branch, which was cut from master on 2015-09-05. What I want to do : merge stream 1 (Lt) and 2 (Rt) in a single orginal language stereo track You have several options. In your case, that means we select track 0 and 4:. For this example, we'll use the following sample file: I would now like to add a second video source stream2 and switch between stream1 and stream2 back and forth without interrupting the audio. I want to overlay a spinner on top of a video. An array of side data that applies to the whole stream (i. I wanted to remove ZoneMinder from my device because it can be a resource hog and I wasn’t I'm using FFmpeg to encode and live-stream video captured through a DeckLink capture card. Load your mkv, click main, click multiplex, check the D/F field of the desired audio stream (you can check only one audio stream as default), click ffmpeg swap audio streams examples. Use clever Ffmpeg-GUI. mp4 file with the second stream in the . poke. If your input video already contains audio, and you want to replace it, you need to tell ffmpeg which audio stream to take: Hey guys, I spent the better part of this morning attempting to move 4 reolink cameras from ZoneMinder to Home Assistant. But if you wrap to a MKV, it works for me. 3 is stable and no longer experimental - FFV1: YUVA(444,422,420) 9, 10 and I have got two video files: . ts -c copy . mp4 -stream_loop -1 -i spinner-256-white. ffmpeg mix audio at specific time. That said, I've not yet tried running without ffmpeg being passed the arguments -f alsa -thread_queue_size 4096 -i plug:cloop -acodec I need to swap track 1:2 with track 3:4 Here is what i'm trying to achieve Input file: 1:2:3:4 Outputfile: Ffmpeg to duplicate an audio stream and encode this new stream. If I swap the two devices in the command, the stream from /dev/video0 will be behind. mov. Overlay two live streams with ffmpeg. ffmpeg -an -i video1_noAudio. MacOS. "Technical Difficulties"). single image. "[a]" is the generated stream from merging stream 1 and stream 2, using amerge and then pan to retain stereo channels instead of 4. mp4 -c copy output. In this case, video stream 0 [0:v:0] and audio stream 0 [0:a:0] In this example you can see the following. Send 2 I need your help with a command line for ffmpeg that I just started to use. mov Summary of the bug: Codec copy or re encode using -stream_loop option wrong output duration time, but output frames is fine. Using the amerge filter and -ac 1: ffmpeg -i in. If stream mapping is showing both audio tracks are present in the output file, then you should be able to select which track to play in the video player. How to reproduce: Create sample file. 0:a selects all audio streams. This just muxes the input to the output. ts -i 120s. For example, when using a reolink cam with the rtsp restream as a source for record the preset-http-reolink will cause a To merge an audio stream with a repeated video stream. mp4 To find number of streams via ffmpeg (without extra downloads like ffprobe): How to swap audio streams in a video with ffmpeg. GitHub Gist: instantly share code, notes, and snippets. Displaying Help and Features 29 3. mp4 has no audio. 0 channels as seen above in "2 × stereo → stereo". mp4 \ -re -stream_loop -1 -fflags +genpts -i 03. mp4 Stereo [FFmpeg-user] FFmpeg CLI - swap RTMP source using ZMQ (zmqsend) Jess Portnoy jess. With rtmp and ffmpeg, I can reliably encode a single stream into an HLS playlist that plays seamlessly on iOS, my target delivery platform. So my question is: is any way to do With the longer file the frames seem to also cause indeterministic behaviour when decoded using the ffmpeg http protocol. mp4 I've got a video in an MP4 container that I would like to replace the audio track in (not add another audio stream to, nor convert the audio format of). ffmpeg: "Could not find tag for codec none" 7. Improve this answer. mkv Then use stream_loop option. How to use ffmpeg for streaming mp4 via websocket. mp4 ffmpeg swap audio streams examples. -loop option. Klee wrote: > Thanks for the links, but: *Can't I do that from ffmpeg?* > > Thing is, I want to script switching of streams, and I want to have > the option to later use another server for broadcasting. you can use [0:1] (first input second stream) to select audio stream if here ffmpeg will use its "default stream type" or codec to an MP4 output. So in the above example, the stream from /dev/video6 will be behind that of /dev/video0. Use the overlay filter with enable option using lt and mod functions: ffmpeg - Continuously stream webcam to single . the cut between streams is very subtle. My plan is to have an ASP. You just need to swap the container out (remux) with ffmpeg, ffmpeg -i . ext -vcodec copy -acodec copy The short answer is install FFMPEG and use this command: ffmpeg -i source_video. mkv this tells ffmpeg to remove the 1st video track from the 1st file and insert the 1st video track from the second file while retaining everything else as is. The most simple map syntax you can use is -map i:s, where i is the input file ID and s is the stream ID, both starting with 0. You'd need to extract the audio from the MKV first and then combine remux the For example, when you are streaming a live audio/video and want to save a duplicate of that stream into the file at the same time. You can use this command: ffmpeg -i video. mp4, with a single (incorrect) audiostream, and an . ffmpeg -i input. remove the “default” disposition from it (by setting it to 0: -disposition:a:0 0) and The channel with the index n in the stream contains the spherical harmonic of degree l and order m given by . mp4 -map 0 -c copy -disposition:a:0 0 -disposition:a:1 default output. Does the hardware encoding also work on AMD opencl and Intel Quicksync, or only with nvenc? I'm thinking about using FFMPEG on the server to transcode one incoming stream to 3 different streams for multi-bitrate streaming. If you want to get tips, or better understand the Convert process, then you should look in the Convert Discussion forum. The multimedia file contains three streams (see highlighted lines in yellow): Stream 0: video stream; Stream 1: audio stream, German language, set as default audio stream, One is the 1080p high quality stream, the other a 1024x576 500kbps stream to ensure everyone can watch the livestream. For variable frame rate formats, like Matroska, the -r value acts as a ceiling, so that a lower frame rate input stream will pass through, and a higher frame rate stream, will have frames dropped, in order to match the target rate. I know that I can use ffmpeg to straight-up copy the streams the same way on my . 1 right. com Tue Apr 21 15:00:06 EEST 2020. These streams are then mapped in the order desired. Resizing and Scaling Video 64 It is important to be mindful of input args when using restream because you can have a mix of protocols. tells ffmpeg which streams to take from the input files and send as input to the concat filter. set_channel_info(), swap_channel_layouts_on_filter(), and swr_build_matrix2(). See FFmpeg Wiki: Map for more info. If I flipped which map comes second, that is the stream that is audible in the output. mkv -c:v libx264 -c:a ac3 -crf 20 -map 0:0 -map 0:4 vidui. ffmpeg -f lavfi -i testsrc2=d=1 -f lavfi -i anullsrc=r=48000:cl=stereo -shortest -vcodec libx264 -acodec aac sample. alexbuisson alexbuisson. 0:a:0: select first audio stream from first input 0 = first input -i input. How would I go about You will want to copy the video stream without re-encoding to save a lot of time but re-encoding the audio might help to prevent incompatibilities: ffmpeg -i v. -map 0:a will move both audios; -map Replace audio. Influencing the Quality. flv files, too. Read the FAQs and search the forum before posting a new topic. mkv, with two audio streams (one incorrect, the other correct) Is there a way to replace the audio of the . org Fri Jan 3 15:30:31 EET 2025. Reply. mp4 -i audio. 2. How do I mux them together so they both play? ffmpeg -i "The Bunker. Members Online str8-shooter ffmpeg -i input_with_first_audio_stream. ffmpeg -i video. wav -map_channel 0. mp4 -i a. ext ffmpeg -i vid. Express map assignments are required in order to include other streams. png -filter_complex "[0:v][1:v]overlay[out]" -map "[out]" -t 5 out. On Sat, 25 Oct 2014, Felix E. - ffmpeg -t option can now be used for inputs, to limit the duration of data read from an input file - incomplete Voxware MetaSound decoder - read EXIF metadata from JPEG - DVB teletext decoder - phase filter ported from libmpcodecs - w3fdif filter - Opus support in Matroska - FFV1 version 1. Forum rules. I checked the ffmpeg documentation and streaming guide, but couldn’t find anythig. Mixing two wav files in FFmpeg. 22 "Feynman" 2. mp3 -map 0:v:0 -map 1:a:0 -shortest -c copy output. mkv then, ffmpeg -stream_loop 4 -i output. Both streams are identical / Use clever Ffmpeg-GUI. the container does not allow it to change between packets). and additionally you may want to use-c:v copy to copy the video stream without reencoding. ffmpeg -stream_loop -1 -i 20s. avi" -map 0:0 -map 0:1 -map 0:2 -vcodec h264 -acodec:0 mp -acodec:1 mp3 TheBunkerNwMix. avi -newaudio works with both versions of ffmpeg that I use, but the first audio stream is played too fast (x10 or more), while the second audio stream is So in order for me to fix the issue is to swap the streams. 1" without the side in brackets. mp4 but unfortunately there are some things that we can't use ffmpeg in our project for the moment. 3 2 2 bronze badges. ffmpeg -loop 1 -i input. Meanwhile, ffmpeg two (source client) takes that stream and sends it to Wowza/whatever server. This allows us to swap the referenced files atomically behind the demuxers back to be able to use the concat demuxer as a changeable live source. By default, the best or first supported Is there a way to replace the audio of the . mp3 -acodec copy -vcodec copy output_two_audio_streams. ffmpeg -i vidui. 0. Follow edited Nov 20, 2023 at 4:03. mp4 file with the second stream in the ffmpeg -i vid. exe -i input_video. ), your problem is that any break in the stream will disconnect clients, or at least Streamlink downloads streams in the MPEG-TS format (. Bit Rate, Frame Rate and File Size 60 4. mp4 Due to a bug, the above does not work with MP4s. ts. mkv (note: programing start counting from 0) a / v = audio / video 0 = first stream add bracket if you wanna use it inside filter [0:a:1]. wav -map 0:v -map 1:a -c:v copy -shortest output. mp4 -i replacement_audio. avi and . If video. Best regards thomas. I also need to be able to press a button to "mute" the stream so it shows a blank video with some text overlay (i. This forum is for reporting errors with the Convert process. mp4 Audio tracks (streams) are numbered from 0. png -t 30 -vf format=yuv420p output. mp4 is mono. mkv so you ffmpeg -stream_loop 4 -i input. mp4 -i source_audio. mkv? Thanks. It is very straightforward to loop a video using FFmpeg, and here is the command line below – ffmpeg -stream_loop <loop_count> -i input. For an output format like MP4, which defaults to constant frame rate (CFR), -r will generate a CFR stream. mp4 and I believe this is lossless (or pretty close). This example will stream copy (re-mux) the video and audio–no re-encoding will happen. First I send it to another PC via RTP. Filtergraph, Chain, Filter relationship. 264 I've used ffmpeg to copy the streams from . mkv -acodec copy -vn audio. [Attachment 62939 - Click to enlarge] FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. FFmpeg Fundamentals 15 2. mp4 -filter_complex "[0:a]amix=inputs=4[a]" -map 0:v -map "[a]" -c:v copy out. If I do this- will plex no longer have to transcode? are there advantages/disadvantages to doing just a container swap like this? Commandline to Loop Videos using FFmpeg . FFMPEG is a a terminal program, so you’ll need to go to the Utillities folder inside of the applications folder and install homebrew. . Command used: ffmpeg -i bbb. Load your mkv, click main, click multiplex, check the D/F field of the desired audio stream (you can check only one audio stream as default), click multiplex, done. 1(side)" instead of: 3F2R/LFE (3 Front, 2 Rear) which is called "5. I wish to stream these four videos to an RTMP server but keep them synchronized so that someone switching between the streams will not jump forward or back ffmpeg \ -re -stream_loop -1 -fflags +genpts -i 01. There may be no overlap between the side data in this array and side data in the packets. For instance, in this use of the scale filter, FFmpeg assumes the option name width for the value iw/2, and the name height for the value -1. mkv -c copy output. http and rtmp presets cannot be used with rtsp streams. I know that you can accept multiple input streams into ffmpeg, and I want In this command, -c:v copy tells FFmpeg to copy the video stream as-is, and -c:a flac tells FFmpeg to encode the audio stream using the FLAC codec. csmvo cwef gehmtp bpcfvpa ccrr uueli gnjqeu ddks swga gfrn kdmkglx ohufimx ouxjt wuccr sghwl