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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15 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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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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1answer
43 views

How to cut part of MP4 file using FFmpeg without reencoding?

I have MP4 file. It's duration is 18 minutes 22 seconds. I want to cut part form 7:35 to 14:01 and to save this part as another MP4 file without reencoding. How to do it using FFmpeg?
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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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1answer
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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 ...
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33 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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1answer
29 views

Video artifact removal and restoration - How can it be done? (Really?)

I have been researching this for the past couple of days, and all I could find on the subject were a bunch of research papers, a demonstration video of a model that isn't publicly available, and a ...
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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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1answer
71 views

Can ffmpeg calculate a new starting keyframe when being asked to split/copy on a non-keyframe?

I understand from a question here that keyframes can (and do) occur anywhere in an h.264 stream, so I'm wondering why most of the advice I see where users want to cut on a specific time or frame (that ...
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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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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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281 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
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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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FFMPEG Multiple Videos into single image sequence [duplicate]

I have multiple mp4s that I want to convert to a single jpg image sequence. Lets say I have 000000001.jpg, 000000002.jpg, 000000003.jpg from the first mp4. I want the second mp4 to name the first ...
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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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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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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
103 views

How to embed cover art into MP4 without errors?

I want to add artwork to my MP4 file. How do I do this successfully / without errors? I've tried these methods with numerous MP4 files, none worked. If you would like to replicate the errors / bugs, ...
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216 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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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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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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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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84 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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132 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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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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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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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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1answer
1k views

AAC stream in MP4 file has wrong duration. How to fix?

I've got an MP4 file that is actually 2:09:42 long. But when playing it in VLC player it is being shown as 7:13:45 long. I'm trying to fix this file. I remuxed it using ffmpeg -i input.mp4 -codec ...
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81 views

How can I convert a large file from MP4 to MOV?

I recorded a 5 minute video with my phone, it is a 565M MP4 file. I need to submit it as MOV, specifically. All online converters reject the file as 'too large' and all downloadable programs cost at ...
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547 views

“Unable to open key file” error when remuxing a set of encrypted .ts files (as a .m3u8 playlist) into .mp4 with FFmpeg

I'm trying to remux a set of encrypted .ts files (as a .m3u8 playlist) into a single .mp4 file with the next command: "C:\Users\~\Desktop\test\ffmpeg.exe" -allowed_extensions ALL \ -i "C:\Users\~\...
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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
101 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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1answer
85 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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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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1k views

Need help to fix a broken MP4 which lacks a MOOV atom

Please be forgiving to a video file format newbie, who has travelled far and wide all over the Web in search of a relatively simple question and hoped to get an answer (even a fairly complicated one ...
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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
709 views

How to prevent ffmpeg from dropping frames when trimming?

I'm using ffmpeg to trim a Zoom video recording (format: ISO Media, MP4 v2 [ISO 14496-14]) via this command: ffmpeg \ -ss 00:11:42 \ -to 01:11:22 \ -i input-original.mp4 \ -c copy \ output-...
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84 views

Smallest Possible Video File in H.264 Format

I am writing some unit-tests for a software that does some work with videos. To do so, I need a programmatically generated video file that is both small and legitimate in that it is actually a ...
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Video loss when converting MP4/h264/aac to Matroska/VP8/Vorbis/

I received a MP4 video with an h264 video stream and an aac sound stream. I want must convert it to (sic): Ogg Vorbis or Ogg Speex format for audio, and Matroska VP8 or Ogg Theora for video I ...
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231 views

How do I change output file format in ffmpeg batch, when using drag and drop?

I've been searching around for this for some time but can't find a working solution. I found this question, which is close, but not exactly what I need. I'm windows and ffmpeg to convert movs to mp4. ...
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2answers
404 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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How to extract each video scene with FFmpeg

I'm trying to detect scenes and save them as individual files with FFmpeg. I found this long command somewhere, but it fails with a good detection. I change the scenecut value, but I don't see any ...
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712 views

ffmpeg: Preserve timecode when converting mov to mp4

This seems simple enough. I want to do a basic conversion of a .mov file to a .mp4 file using ffmpeg. The hitch seems to be that I also need to preserve the timecode. I've looked at many posts from ...
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243 views

error editing a long video using VirtualDub2

I have several long video files that I need to edit (remove some initial parts, breaks and dead moments) and I always got errors when I try to save / export the edited file in mp4. The pcm_f32le: ...
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1answer
37 views

Some MP4s have keyframes on scene changes. Others seem to have random keyframes, or keyframes every X seconds. What causes this discrepancy?

Some MP4s have keyframes on scene changes; others have keyframes seemingly randomly placed, or placed every 5-10 seconds. I prefer the former, both for ease of editing and because, unless I'm ...
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2answers
827 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
810 views

Trim audio stream to video stream length

I have an mp4 file (converted from an mkv file) that has a longer audio than video stream. This file doesn't play back nicely in my media streaming app (or MPC-HC) when I reach the end of the file. ...
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5k 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 ...
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56 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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267 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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