Questions tagged [mp4]

A digital multimedia container format most commonly used to store video and audio, but which can also be used to store other data such as subtitles and still images.

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1answer
17k views

Howto Repaire or fix the duration of a mp4 video

I'm having a film that's ffmpeg and other progs claims to be 07:03:52 long, but the real playtime is actually more like 2:35:00 ffprobe video.mp4 ffprobe version 3.0.2 Copyright (c) 2007-2016 the ...
3
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0answers
6k views

moov atom not found

I downloaded this video using youtube-dl's HLS downloader. The video was being HLS streamed using AES-128. Even though I could view it perfectly fine when it was being streamed in the browser, VLC ...
2
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0answers
25 views

Stabilize MP4 from gyroscope metadata? (Insta360)

I just got an Insta360 One R 1-inch sensor and the footage is shaky as hell. I realised that you need their desktop application to actually stabilise in post-production but since I'm on Linux this is ...
2
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0answers
50 views

Widely compatible video format with lossless audio

I'm a software developer. My software produces animated video files with music. The video files should be compatible with a wide range of software, and they should have excellent audio quality. The ...
2
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0answers
2k views

Sony AVC vs. MAGIX AVC vs. MainConcept MPEG-2: what's the difference?

In VEGAS Pro 16.0 I'm given (at least) three options if I want to render a 1080p 30fps video for YouTube upload: Sony AVC/MVC, template "Internet 1920x1080-30p" Use this setting to create the ...
2
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0answers
738 views

Extract file thumbnail from mp4 file

I'm currently converting a few mp4 file to mkv. In the process they lose their file thumbnails and I wanted to keep them. So I'm searching for a way to extract the custom thumbnails from the mp4 files ...
2
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0answers
33 views

what encoder can take advantage of 16-core setup? converting/ripping Blu-ray to mp4 format

I'm thinking of upgrading my 6-core setup (single CPU) setup to a 2x8-core/CPU setup. I'm wondering what software will allow me to fully utilize all the cores. I've been using handbrake but I do not ...
2
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0answers
10k views

Using GoPro Studio to edit non-GoPro videos

I'm trying to use GoPro Studio to create a video that includes GoPro video as well as HD video from an iPhone. GoPro Studio was not able to deal with the .MOV file from the iPhone (the audio was ...
2
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0answers
110 views

Set ipad compatible thumbs for mp4 videos based on a frame of the video with command line

I have a directory of 100 mp4 files. All are working well on my ipad but most of them do not have a working thumb. I want to generate these thumbs with a command line command (on macosx) based on a ...
1
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0answers
8 views

same image MP4 and png color differences

I'm making a 3D animation but, parts of it need to be static. I can use png renders for that, but pang format have slightly another color than mp4's. Because of this, ther's a visible difference when ...
1
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0answers
34 views

VLC doesn't play mp4v video converted with VLC to h264/h265

VLC reports the original video as: Codec: MPEG-4 Video (mp4v) Video resolution: 8192x8192 Frame rate: 7.549296 I am using the Convert / Save option to convert the video using the following profile: ...
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0answers
32 views

How to convert Fast Mpeg 4v2 (mp4v) with ffmpeg

I have problem with ffmpeg properly recognizing a video encoded with Microsoft Fast Mpeg 4v2 codec. Apparently it's a software codec. VLC plays the video fine. The codec reported by VLC is: Codec: ...
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0answers
33 views

Why does audio not work for this mp4 when played on IPad with headphones plugged?

I'm hosting this video : https://itype.techforge.com.au/assets/videos/repeated/WordRat.mp4. It seems to work fine unless you happen to be on an IPad and plug the headphones in. With the headphones ...
1
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0answers
23 views

Merge mp3 with jpg and add moving volume as background

I'm trying to put an image with a song and save it as a mp4. But I need some app makes me able to add simple moving edits to the background like Volumes moving Something like this : I wish you can ...
1
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1answer
27 views

Premiere Pro on Windows 10 N version - Can't import MP4

I've tried to install various codecs - not working. I still can download whole Media Feature, but that's what I would like to avoid, since N version is way lightier. Can you please advice me how I ...
1
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0answers
84 views

Screen-Video with 7 FPS (in Davinci Resolve - or other tools?)

I currently edit/cut a lot of computer screen recording footage. The original mp4 files have 7 FPS and I am totally happy with that quality. If I now edit the files in Davinci Resolve 16, the lowest ...
1
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0answers
568 views

MP4 Video created with ffmpeg C++ api does not show in OSX

I am writing a MP4 video from scratch using the C++ API (libav* 4.1.1). This video can be played back just fine using ffplay or VLC. But the Finder Preview and the Quicktime Player on OSX (10.13 and ...
1
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0answers
2k views

What's wrong with VLC seeking and/or MKV created by ffmpeg?

I have creeated a video using FFmpeg. It is a result of putting 4 videos together, tiled, using -filter_complex with overlays. Following the how-to here, I have it created as MKV. When playing this ...
1
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0answers
12 views

Audio in source footage cuts out and starts over a third of the way through (Premiere Pro CS6)

This is a very odd issue that I have been experiencing with a particular video clip. I have a 2 hour long clip that stops the audio at exactly 00:45:21:03 and starts over, as in the audio from the ...
1
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1answer
259 views

ffmpeg: How to avoid “start: 0.033333” when extraction audio from mp4

When extracting audio and video separately from a mp4 and recombining again ffmpeg -accurate_seek -ss 30 -t 10 -i input.mp4 -vn output-audio.mp4 ffmpeg -accurate_seek -ss 30 -t 10 -i input.mp4 -an ...
1
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1answer
611 views

Concat files of different encodings?

I have nearly 130 files that I want to burn onto a DVD as an end result. I've gone down a bit of a rabbit hole and ended up at ffmpeg trying to combine all the files into a single giant 2 and a half ...
1
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0answers
497 views

Change resolution according to bandwidth at the start of the video

The use case described here is very much the same as the YouTube's feature where a lower resolution of the video is selected if the user's network speed is low. But, I'd like to do this only at the ...
1
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0answers
1k views

FFMPEG MXF -> MP4 - Cannot get proper audio on output file

I am software developer working on a project that requires my video files to be an mp4 format, as this is what most vendors support. I am trying to use ffmpeg, to rewrap the MXF file, into an mp4. ...
1
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0answers
76 views

ffmpeg h264 crashes IE intermittently

First for moderators, this is relevant because I have incorporated ffmpeg in a program to render videos needed for a web-app. My problem is that the videos I render randomly crash IE 11. Other ...
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0answers
341 views

Losing audio in re-encoding with ffmpeg

I have some DVDs I want to save MP4s from. The video files are VOB files. I can play them if I change the extension to .mp4, but I can't use the seek bar in Windows Media Player. Also, the files are ...
1
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0answers
2k views

Switching between H.264 video streams on the fly?

I have several H.264 encoded MP4 files, as well as still images. From these I want to generate a single video stream that I can broadcast. The stream will be composed of alternating still images and ...
0
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0answers
15 views

embed an image in an MP3 and convert to MP4

The Situtation: I have the following situation: about 150 mp3 files, about 1 hour to 3 hours long, I need a quick way to convert it to mp4 with a standardized and unique thumb / cover art image that ...
0
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0answers
28 views

I want to convert .mp4 to .ts using H264 at constant framerate 25fps

I've been trying to do this conversion for a couple of days reading through forums ffmpeg -i in1.mp4 -vcodec libx264 -s 720x576 -vf "fps=25"-vsync cfr -b:v 2300k -acodec aac -b:a 128k out1....
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0answers
38 views

What is the difference between .mts and .mp4 video files?

I know that .mts video files use MPEG-4 video compression. But why then don't they just have the .mp4 file name extension? Since they don't, this means they are not digitally nor conceptually ...
0
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0answers
23 views

Streaming MP4 files through HTTP without HLS or DASH?

I am building a web application that consists of a web client and a server. The web client needs to play a continuous stream of MP4 files to the user, preferably through a player like video.js. The ...
0
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0answers
26 views

Moov atom not found on Raspberry Pi platform (Linux)

I have asked this question on innumerable sites but I haven’t been able to get an answer to solve my problem. The question Need help to fix a broken MP4 which lacks a MOOV atom Seems to be on point ...
0
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0answers
18 views

concat a/v desync (only in MPC-HC)

I'm concatenating .ts chunks intended for an HLS player into a single .mp4 video. Unlike in other questions these chunks possess same stream properties, However, some chunks have audio stream shorter ...
0
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0answers
12 views

ovelays not embedding properly and no audio

I have a bunch of small mp4 files (without audio), and an mp3 audio file. Using the concat protocol, I concatenated them with -shortest flag ffmpeg -f concat -safe 0 -i "list.txt" -i ".....
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0answers
8 views

Should I keep any of the auxiliary files associated with an .MTS file?

When recording on a video camera, it not only generates the video in .mts format, but also some auxiliary files in various other folders that seem to be bookmarking cues and thumbnails for the video ...
0
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1answer
14 views

Should color grading be performed on raw clips, or final sequence?

Camcorders that record in .mts (.mp4) files usually split recorded files according to some maximum time limit per clip. For example, after recording straight for 30 minutes, we might find the entire ...
0
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1answer
34 views

ffmpeg convert 1 jpeg frame to 10 sec video

I have a 952x600 jpeg image, generated by a PHP script. I want to create another PHP script that uses ffmpeg, which converts that jpeg image to a mp4 video, which has only 1 frame that lasts for 10 ...
0
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1answer
100 views

ffmpeg mov_text subtitle too small when converting mkv to mp4

I want to remux a mkv file into mp4. I used the following command. ffmpeg -i "input.mkv" -c:v copy -c:a copy -map 0:0 -map 0:1 -map 0:2 -map 0:3 -c:s mov_text "output.mp4" Problem:...
0
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0answers
88 views

How can I check the Initialization vector (IV) of fmp4 init file

I am trying to debug a DRM problem, I have with one of my HLS streams. I want to extract the IV (initialization vector) value for the segments. Normally if it is used constant_IV the IV the ...
0
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2answers
36 views

Merging mp4 files and preserving subtitles

I'm in the process of digitizing my entire movie collection. For the most part, it's pretty smooth. I'm using Handbrake to put everything in mp4 format, and it's getting moved to my Plex server. The ...
0
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1answer
159 views

ffmpeg - Slow down video and loop/repeat audio

I am trying to use ffmpeg to slow down a video speed by 25% (75% speed) without changing the audio speed. ffmpeg -i input_video.mkv -filter:v "setpts=1.3*PTS" "SlowVideo25.mp4" On ...
0
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0answers
245 views

Merging MP4 files with VLC results in a file with all the video but only a fraction of the audio

I'm using VLC 3.0.11 on Windows 10. I have 24 .mp4 files containing audio and video that add up to 17 minutes, 28 seconds. I ran the following VLC command to merge them into a single .mp4 file: set ...
0
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1answer
50 views

How to Merge Multiple MP4 videofiles using concat of ffmpeg while transposing 180 degrees two MP4 videofiles

How to Merge Multiple MP4 videofiles using concat while transposing 180o two MP4 videofiles? Currently, i am using the following ffmpeg (concat) command: ffmpeg -f concat -safe 0 -i VIDEOFILES.txt -...
0
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0answers
685 views

ffmpeg non-existing SPS 0 referenced in buffering period

Hello Guys I just wanna ask if this log is normal or not? I'm just curious. I can play the output mp4 without problem. I just want to know what is this log I used ffmpeg version 4.2 because the ...
0
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3answers
325 views

How to solve audio/video sync issue on my mp4 screenrecording?

I'm relatively new to video editing and struggling to solve a problem whereas the video (i.e my lips) is out of sync with the audio (i.e my voice). The beginning of the video is fine but by the end ...
0
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0answers
8 views

Samsung Galaxy MP4 videos twitch after saving with AVIDemux without recompression

I encounter strange jitter after just saving videos produced by Samsung Galaxy S2 / S3 native camera app (a part of stock ROM). Here are steps to reproduce this odd result: Choose a video with an ...
0
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0answers
47 views

Editing issues with variable framerate input footage (Whatsapp videos)

I have to make a video for social media, mixing several short clips which have been sent to me via Whatsapp. I'm using Da Vinci Resolve 16. When taking the videos into the timeline, I get several ...
0
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0answers
530 views

FFMPEG concat with constant frame rate

I'm concatenating 2 video files 00000 and 00001: ffmpeg -y -f concat -safe 0 -i file_list.txt -loglevel error -c copy test.mp4 file_list.txt: file '00000.mp4' file '00001.mp4' 00000.mp4: Duration: ...
0
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0answers
18 views

how to store and playback segments of video in different fps?

I am working on video compression techniques and was trying to segment the video into important and unimportant parts. Unimportant parts are stored in 30 fps and important parts of the video are ...
0
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1answer
218 views

Issues with transcoding to a MXF container

I'm new here, so hi to all :). I'm new to FFmpeg too, and I'm trying to transcode a HEVC file to a mxf file and I'm having some issues. The original file is a rip I made from a Bluray HDR movie a ...
0
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2answers
381 views

How to convert ts to mp4

I have a lot of videos needed to convert from ts to mp4, how can I convert it without losing quality? I mean a lot like 30+ each week. I did a search already but none can do it fast enough, doing it ...