I have a 3-hour long .mp4 video that has sensible breaks roughly every 30 minutes or so. I want to export this into multiple videos of each section, but have run into nothing but problems trying to do so. This isn't something I do often so I don't really want to invest in commercial tools for this one task, but as yet I can't find any free tool capable of this job. I really would prefer to just cut this up without having to decode and re-encode the file(s) all over again. I'd like to just mark the sections I want, and spit them out as standalone .mp4s. No other edits, no corrections, no effects, no anything... just cut & export without any formatting changes at all. I thought Handbrake could do this, but if it can I can't figure out how. I then thought maybe iMovie (10.x as I'm on Mavericks), but that's been nothing but headache and appears to decode the entire movie first before working with it anyway. Quicktime itself seems only able to direct export as .mov and I don't want to re-encode to mp4 all over again. I keep running into free/open source programs that either are only free in a very limited fashion (like 5 minute max exports, or nasty watermarks, etc.) or that won't run on Mavericks. Is what I'm looking to do just not possible without commercial software? Is it really so difficult to split one long mp4 into several shorter ones?

I have a screen capture of my computer screen using QuickTime's Screen Recording feature, but that saves it to an MOV format. I'd like to export it to MP4. Is that possible without installing anything else? I'm using Yosemite, and I'm pretty sure I could do that with Mavericks.

I have private MP3, MP4 and WAV files that are not available via the itunes store, as they are private. I use Linux, so how can I download them from a web server, save them on the iPhone, manage them and play them? Is the Files app the means of doing that?

Open with the document App, only the file name and file type will be displayed, and the general video can be played directly. So, I switched to AVplayer to play this video with only sound but no picture. mp4info:

File:
  major brand:      mp42
  minor version:    0
  compatible brand: mp42
  compatible brand: mp41
  fast start:       yes

Movie:
  duration:   18842880 (media timescale units)
  duration:   209365 (ms)
  time scale: 90000
  fragments:  no

Found 2 Tracks
Track 1:
  flags:        1 ENABLED
  id:           1
  type:         Video
  duration: 209320 ms
  language: eng
  media:
    sample count: 5233
    timescale:    25000
    duration:     5233000 (media timescale units)
    duration:     209320 (ms)
    bitrate (computed): 9592.363 Kbps
  display width:  1920.000000
  display height: 1080.000000
  frame rate (computed): 25.000
  Sample Description 0
    Coding:       avc1 (H.264)
    Codec String: avc1.640029
    AVC Profile:          100 (High)
    AVC Profile Compat:   0
    AVC Level:            41
    AVC NALU Length Size: 4
    AVC SPS: [67640029ac2ca501e0111f7350101014000003000400000300ca10]
    AVC PPS: [68e881135250]
    Width:       1920
    Height:      1080
    Depth:       24
Track 2:
  flags:        1 ENABLED
  id:           2
  type:         Audio
  duration: 209320 ms
  language: eng
  media:
    sample count: 9814
    timescale:    48000
    duration:     10049536 (media timescale units)
    duration:     209365 (ms)
    bitrate (computed): 317.376 Kbps
  Sample Description 0
    Coding:       mp4a (MPEG-4 Audio)
    Codec String: mp4a.40.2
    Stream Type: Audio
    Object Type: MPEG-4 Audio
    Max Bitrate: 407250
    Avg Bitrate: 317375
    Buffer Size: 1536
    MPEG-4 Audio Object Type: 2 (AAC Low Complexity)
    MPEG-4 Audio Decoder Config:
      Sampling Frequency: 48000
      Channels: 2
    Sample Rate: 48000
    Sample Size: 16
    Channels:    2

I used the video conversion tool to convert it to fit the iPhone：

File:
  major brand:      isom
  minor version:    200
  compatible brand: isom
  compatible brand: iso2
  compatible brand: avc1
  compatible brand: mp41
  fast start:       yes

Movie:
  duration:   209320 (media timescale units)
  duration:   209320 (ms)
  time scale: 1000
  fragments:  no

Found 2 Tracks
Track 1:
  flags:        3 ENABLED IN-MOVIE
  id:           1
  type:         Video
  duration: 209320 ms
  language: eng
  media:
    sample count: 5233
    timescale:    12800
    duration:     2679296 (media timescale units)
    duration:     209320 (ms)
    bitrate (computed): 11996.339 Kbps
  display width:  1920.000000
  display height: 1080.000000
  frame rate (computed): 25.000
  Sample Description 0
    Coding:       avc1 (H.264)
    Codec String: avc1.640033
    AVC Profile:          100 (High)
    AVC Profile Compat:   0
    AVC Level:            51
    AVC NALU Length Size: 4
    AVC SPS: [27640033ac1316c0780227e5c05a8080809818002ee0000bb82f7be0f8442370]
    AVC PPS: [28ee1f2c]
    Width:       1920
    Height:      1080
    Depth:       24
Track 2:
  flags:        3 ENABLED IN-MOVIE
  id:           2
  type:         Audio
  duration: 209320 ms
  language: eng
  media:
    sample count: 9812
    timescale:    48000
    duration:     10047360 (media timescale units)
    duration:     209320 (ms)
    bitrate (computed): 317.379 Kbps
  Sample Description 0
    Coding:       mp4a (MPEG-4 Audio)
    Codec String: mp4a.40.2
    Stream Type: Audio
    Object Type: MPEG-4 Audio
    Max Bitrate: 317379
    Avg Bitrate: 317379
    Buffer Size: 0
    MPEG-4 Audio Object Type: 2 (AAC Low Complexity)
    MPEG-4 Audio Decoder Config:
      Sampling Frequency: 48000
      Channels: 2
    Sample Rate: 48000
    Sample Size: 16
    Channels:    2

The AVC Level and bitrate both higher than the first video, but it plays normally。 So why can't the first video play? I want to know which MP4 videos the iPhone can't play. Apple doesn't have specific specs, but says it supports MP4 and H.264

I've downloaded a video which is being shown as a document file in finder. When clicked on, it opens with TextEdit instead of QuickTime player. When I run the following command in terminal,

vid

the output is "vid: ISO Media, MP4 Base Media v1 [IS0 14496-12:2003]." I have other mp4 videos which give the same output as above but open normally with QuickTime Player. How do I convert the document file to a playable mp4 file?

Background info: Apple provides hardware acceleration support for encoding h264 and h265 videos through VideoToolbox. ffmpeg has built-in support for VideoToolbox through the h264_videotoolbox codec. Problem: I have a bunch of .png images I want to make into a high-quality mp4 video. Using "-crf 18" works fine without hardware acceleration, as in the following:

ffmpeg -pattern_type glob -i '*.png' -framerate 25 -c:v libx264 -crf 18 -preset veryslow out.mp4

But this takes forever. I can force a bitrate and use my Mac's hardware acceleration by doing something like this:

ffmpeg -hwaccel videotoolbox -pattern_type glob -i '*.png' -framerate 25 -c:v h264_videotoolbox -b:v 7000k out.mp4

...which encodes at 100fps rather than E..V..... Profile (from 0 to 4) (default 0) baseline E..V..... Baseline Profile main E..V..... Main Profile high E..V..... High Profile -level E..V..... Level (from 0 to 52) (default 0) 1.3 E..V..... Level 1.3, only available with Baseline Profile 3.0 E..V..... Level 3.0 3.1 E..V..... Level 3.1 3.2 E..V..... Level 3.2 4.0 E..V..... Level 4.0 4.1 E..V..... Level 4.1 4.2 E..V..... Level 4.2 5.0 E..V..... Level 5.0 5.1 E..V..... Level 5.1 5.2 E..V..... Level 5.2 -coder E..V..... Entropy coding (from 0 to 2) (default 0) cavlc E..V..... CAVLC entropy coding vlc E..V..... CAVLC entropy coding cabac E..V..... CABAC entropy coding ac E..V..... CABAC entropy coding -a53cc E..V..... Use A53 Closed Captions (if available) (default true) -allow_sw E..V..... Allow software encoding (default false) -require_sw E..V..... Require software encoding (default false) -realtime E..V..... Hint that encoding should happen in real-time if not faster (e.g. capturing from camera). (default false) -frames_before E..V..... Other frames will come before the frames in this session. This helps smooth concatenation issues. (default false) -frames_after E..V..... Other frames will come after the frames in this session. This helps smooth concatenation issues. (default false) ``` What is "level"? How do "baseline"/"main"/"high" differ and what is a "profile"...? I'd appreciate examples of how to use h264_videotoolbox properly with ffmpeg and specifically how to achieve something like the CRF option that exists with the default h264 codec.

So I have a simple task that I do a lot: trimming a video's head and tail off. On Windows, I open the photo, click edit, drag the bars to where I would like to cut, and I save. It will save as mp4 and I can overwrite the video by selecting the original video before saving (giving the new video the same name). However, on mac, it's not so easy. Method 1: Quicktime -- Open the MP4 video in Quicktime, trim it using an ios-like interface, and save the video as a MOV (no option to overwrite or to save as MP4). Import this MOV into Premiere Rush (which takes a long time to launch and is slow), tell premiere to export to mp4, and wait a minute. Then delete the original mp4 and the mov, and I've finally got the trimmed mp4. Method 2: VLC -- https://www.videoproc.com/troubleshoot-vlc/cut-or-trim-video-in-vlc-on-mac.htm It's clunky, but faster than Quicktime and better suited to my needs. One downside is that I cant tweak the start point once I start recording, I cant see ahead and if it goes too far ill have to trim it a second time, and there are pauses at the beginning and end. Method 3: iMovie -- this is my go-to method for splicing clips together and complex trimming (removing segments in the middle). However, it's slow to export and about as slow as the Quicktime method. I after researching, I could not find one app that trims as easily as Windows Video Player. I am asking the community if there is a simple, Quicktime-like video trimmer for mac that exports in MP4 instead of MOV. I am working with files that are usually 2-3 GB and therefore try to stay away from online services as much as possible (hence why I don't use cloud convert for mov to mp4). Edit: It needs to be free. **Solution:** along with losslesscut specified in the answer below, another solution is the Quick Look function. I'm not 100% sure if this is lossless, but if you want to simply trim video Quick Look has a simple video trimmer that allows you to replace existing video or create a new video in the original format. It is quite fast, making me think it is lossless.

I'm using manim (Python) to create animations. When I preview the 4k MP4 files it generates with Quicktime player, the app displays the whole content at its original size. But I would like those MP4 files to open at a smaller window size. And at this point, I generate about 50 preview files an hour, so resizing them to a smaller size each and every time is tedious. Is there a way to make sure that the QuickTime window opens by default to a size I want, no matter what the native resolution is? A way for QuickTime to remember the size of its last window opened would be perfect. Thanks.

What tool can I use to edit the subtitles embedded in my MP4 video on osx 12.5 ? I tried Aegisub, it loads my video but not its subtitles. Then I tried Jubbler (7.0.3) which froze at video opening.

$ ffmpeg -i myvideo.mp4
ffmpeg version 5.0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/5.0.1_3 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'myvideo.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 512
    compatible_brands: mp42iso2avc1mp41
    creation_time   : 2022-08-03T21:58:07.000000Z
    encoder         : HandBrake 1.5.1 2022011000
  Duration: 00:11:05.40, start: 0.000000, bitrate: 1635 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt470bg/bt470bg, progressive), 712x576 [SAR 16:15 DAR 178:135], 1454 kb/s, 25 fps, 25 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2022-08-03T21:58:07.000000Z
      handler_name    : VideoHandler
      vendor_id       : 
  Stream #0:1[0x2](bre): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 162 kb/s (default)
    Metadata:
      creation_time   : 2022-08-03T21:58:07.000000Z
      handler_name    : Stereo
      vendor_id       : 
  Stream #0:2[0x3](bre): Subtitle: dvd_subtitle (mp4s / 0x7334706D), 720x576, 6 kb/s (default)
    Metadata:
      creation_time   : 2022-08-03T21:58:07.000000Z
      handler_name    : Brezhoneg
  Stream #0:3[0x4](fra): Subtitle: dvd_subtitle (mp4s / 0x7334706D), 720x576, 6 kb/s
    Metadata:
      creation_time   : 2022-08-03T21:58:07.000000Z
      handler_name    : Français
At least one output file must be specified

I have a script that I wrote that uses HandBrakeCLI to convert files from .MOV to .MP4, but then also attempts to preserve various EXIF metadata by using exiftool by using the -TagsFromFile operation to copy tags from the older MOV to the newer MP4 (and then a subsequent additional run for -FileModifyDate