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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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 ...
3
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2answers
14k 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 ...
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0answers
1k 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 ...
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0answers
648 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 ...
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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
107 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 ...
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0answers
22 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 ...
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0answers
27 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 ...
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0answers
17 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 ...
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1answer
16 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 ...
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0answers
61 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 ...
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0answers
481 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 ...
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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 ...
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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 ...
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1answer
224 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 ...
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1answer
514 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 ...
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0answers
477 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 ...
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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. ...
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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
338 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 ...
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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 ...
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1answer
30 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:...
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27 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 ...
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2answers
21 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
39 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 ...
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0answers
114 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 ...
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1answer
17 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 -...
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0answers
354 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 ...
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3answers
48 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 ...
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0answers
6 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 ...
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0answers
27 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 ...
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0answers
264 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: ...
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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 ...
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0answers
17 views

Bitrate to export H.264 for same quality as AVCHD source video

I'm editing an AVCHD video in Premiere Pro (cutting and replacing audio) and when exporting I can't select the same codec (I understood that) so I export to H.264 (which is recommended all-over the ...
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0answers
106 views

FFMPEG Output with wrong frame rate

I am using python to combine several video files together using ffmpeg. Each of the videos files are exactly 20 seconds, 30.00fps, mp4 and the exact same resolution. When I concatenate the files, the ...
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0answers
173 views

checking errors in video files with FFMPEG

I have a collection of movies in mkv format which i keep in an external harddisk.Sometimes I loan the harddisk to my friends.One day my friend told me,he couldn't play an entire movie,it was crashing ...
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0answers
14 views

How can I reduce mpeg file size without losing quality?

I want to download some free videos from a website. There are two option there: DVD Video *.m2v with 2Gb and H.264 Video *.m4v (.mp4) with 400Mb. The second one has low quality. I want to know if I ...
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0answers
73 views

How to use FFMPEG frame transition slowly upward out of view while the next frame slides in the view from bottom to achieve a scrolling effect?

This question also follows another question: How to minimize no of frames/screenshots of web pages required to render a smooth scrolling video using FFMPEG? Scenario: Currently i'm stitching ...
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0answers
34 views

Audio bitrate limited to 192 kbps when exporting an mp4 file!

I have the new Magix MEP Premium 2020, when I try to export an Mpeg 4 (mp4, h.264), the highest kbps I get for audio coding is 192 kbps AAC, in the old version of magix that I had (video deluxe 17) I ...
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1answer
119 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 ...
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2answers
130 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 ...
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0answers
20 views

Windows MP4 player program(s) seek bar

What Windows MP4 player program(s) has a seek bar button that a) always stays where I put it (in pause mode) b) always shows the nearest frame corresponding its that position. (You might wonder why ...
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0answers
594 views

Constructing playable mp4 video file from MPEG-Dash segments

I am having an unencrypted MPEG-Dash manifest file and I am trying to re-construct from the downloaded segments a playable video file. I have so far tried to concatenate the initialization file to ...
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2answers
434 views

how can I convert slow motion video into normal speed without losing fps or audio sample rate?

I want to download a slow-motion video playlist (with the frame rate of the videos being either 480 fps or 1000 fps.) and be able to speed up the videos at least 16x without losing the frame rate or ...
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2answers
915 views

Injecting/embedding/adding/writing metadata to a .mp4 file so it's recognised as 360

I'm working on a library that injects/embeds/writes metadata into a .mp4 file to allow the video to be displayed correctly as a 360 video. The input file is a standard .mp4 file in the equirectangular ...
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1answer
62 views

Is public manifest.mpd a issue?

I have a public manifest.mpd file. Is it considered a security issue? It has something called cenc:pssh value so i am bit scared if its okay to be public or not?
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278 views

FFMPEG - Nero and Quicktime Format Chapters

Ok, I'm usually really good at finding the answers to my FFMPEG questions myself but I'm a bit stumped. I've got this file, an MP4, here is part of the MediaInfo: Menu 00:00:00.000 ...
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0answers
47 views

ffmpeg mp4 video created from mp3 with image has longer duration

I am trying to convert an mp3 to mp4 with images. Below are two ffmpeg commands I tried. Length of mp3: 23 sec Here, the length of the video is same as the mp3, but video's sound does not work when ...
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1answer
46 views

I have a .ts video containing a 720° video record it with an AllieCam360

Hi I have an AllieCam a camera to record 720 videos 360x2 lenses, the format it use is .ts, the program requires a login online, but the manufacturers drop the business and the web site is offline, so ...