I am trying to concatenate video files so that next one follows the one before it when it is played. The formatting for all of the files are the same. The files all have audio & video.
I think I am very close (hopefully!) to getting this to work, but I have one final problem. The command below takes all of the mp4 files in my folder and creates a big mp4 file, which is the right size in total MB, but the images for all videos after the first video are garbled. The audio is okay (continues just fine from video to video). Also, I don't get any error messages.
ffmpeg -f concat -i <(for f in /folder1/*.mp4; do echo "file '$f'"; done) -c copy /folder1/all.mp4
I'm not very familiar with ffmpeg yet, so I've just been trying the different suggestions I've found on the web. Can anyone suggest other things for me to try? (I've tried reading the FAQs, but I have to confess that I don't fully understand it. Also, there seems to be some posts about audio being missing after concatenation, but I haven't seen anything on images being garbled.) Thx in advance!
I have had good luck using this ... avconv is a fork of ffmpeg
avconv -i 1.mp4 1.mpeg
avconv -i 2.mp4 2.mpeg
avconv -i 3.mp4 3.mpeg
cat 1.mpeg 2.mpeg 3.mpeg | avconv -f mpeg -i - -vcodec mpeg4 -strict experimental output.mp4
Related
i would like to merge some music (video file) and singing (video file) into one video file.
i've tried with this:
ffmpeg -i music.mp4 -itsoffset 2 -i sing01.mp4 -filter_complex overlay=635:300 test.mp4
and everything is fine, except that i cannot hear the singing. what i should add to this command to do the job correctly?
thanks
I've a some hundreds of video files in a folder structure. All of them have video and audio streams, but some of them don't have any sound, despite having an audio stream. Is there a way to find out those files without having to resort to opening each file individually.
Most ways I know only check if there is an audio stream.
Thanks.
You can run the following in batch mode:
ffmpeg -hide_banner -i file.mp4 -af volumedetect -vn -f null - 2>&1 | grep mean_volume
The output for each file will be of the form
[Parsed_volumedetect_0 # 0000000002b1e800] mean_volume: -17.2 dB
Perfect digital silence will have a value of -91 dB, but anything below, say, -40 dB is probably just tape noise. Test and verify a few inputs manually and set a value.
I have a dummy client that is suppose to simulate a video recorder, on this client i want to simulate a video stream; I have gotten so far that i can create a video from bitmap images that i create in code.
The dummy client is a nodejs application running on an Raspberry Pi 3 with the latest version of raspian lite.
In order to use the video I have created, I need to get ffmpeg to dump the video to pipe:1. The problem is that I need the -f rawvideo as a input parameter, else ffmpeg can't understand my video, but when i have that parameter set ffmpeg refuses to write anything to stdio
ffmpeg is running with these parameters
ffmpeg -r 15 -f rawvideo -s 3840x2160 -pixel_format rgba -i pipe:0 -r 15 -vcodec h264 pipe:1
Can anybody help with a solution to my problem?
--Edit
Maybe i sould explain a bit more.
The system i am creating is to be set up in a way, where instead of my stream server ask the video recorder for a video stream, it will be the recorder that tells the server that there is a stream.
I have have slowed my problem on my own. (-:
i now have 2 solutions.
Is to change my -f rawvideo to -f data that works for me anyways.
I can encode my bitmaps as jpeg in code and pipe my jpeg images to stdin. This also requires me to change the ffmpeg parameters to -r 4 -f mjpeg -i pipe:0 -r 4 -vcodec copy -f mjpeg pipe:1 and is by far the slowest thing i have ever done. and i can't use a 4k input
thanks #Mulvya for trying to help.
#eFox Thanks for editing my stupid spelling and grammar mistakes
i've tried many ways to solve the problem, i also tried this code before
ffmpeg -i movie.mp4 -vf trim=3:8 cut.mp4
but for the result, the audio is still there but the video is gone. all i want is the video and audio both are removed.
can anyone help me how resolve this?
Use
ffmpeg -i movie.mp4 -vf "select='not(between(t,3,8))',setpts=N/FRAME_RATE/TB" -af aselect='not(between(t,3,8))',asetpts=N/SR/TB cut.mp4
I'm developing Android application, and im using ffmpeg for conversion of files.
I want my binary file to be as slim as possible since i don't have many input formats and output formats, and my operation is quite basic.And of course not to bloat the APK.
In my program ffmpeg receives a file, and copys the audio stream (-acodec copy), the audio stream will always be aac (mp4a). What i need is to save the stream to file.
My command looks like this : ffmpeg -i {Input} -vn -acodec copy output.aac.
What muxer do i need to for muxing aac to file? I have tried flv,mp3,mov but i always get
Unable to find a suitable output format for 'output.aac', so these options are wrong.
I don't need an encoder for stream copy btw.
Side note: this command work flawlessly on full installation of ffmpeg , but I don't know which muxer it uses. If there is a way to output the muxer it uses from regular ffmpeg run, it would work too.
A common file format for AAC is BMFF/MOV/MP4/M4A. If you specify the m4a file extension, FFmpeg will take care of it for you.
ffmpeg -i {input} -vn -acodec copy output.m4a
If you just want raw AAC, you can use ADTS as a lightweight container of sorts, as Mulvya suggested.
ffmpeg -i {input} -vn -acodec copy -f adts output.aac
I had to add the -f for me to work (on FFmpeg 3.22):
ffmpeg -i {input} -vn -acodec copy -f adts output.m4a
You have to add adts to --enable-muxer when configuring ffmpeg, eg. ./configure --disable-everything (...) --enable-muxer=adts. Then you will be able to save to .aac file