M4V → MKV

DRM bron bob amser. Mae rhai M4V ffeiliau wedi eu cêl- ysgrifo ar lefel bitstream gan y siop neu feddalwedd a gyhoeddodd nhw, ac ni ellir datgodio llif cêl- ysgrifedig gan ni na dim arall heb yr allwedd drwydded. Mae ffeiliau rydych chi wedi eu recordio, eu hallforio neu eu lawrlwytho heb eu diogelu yn trawsnewid yn arferol; ni fydd pryniant trwyddededig yn gwneud hynny, ac ni all unrhyw drawsnewidydd ddealladwy ddisgwyl y gwrthwyneb. Ni ellir trosi pryniadau M4V sydd wedi'u diogelu gan DRM gan unrhyw beth; dim ond ffeiliau M4V heb eu diogelu sy'n trosiadwy, ac mae chwaraewyr nad ydynt yn Apple yn aml yn angen ail-enwi'r estyniad.

Efallai na fydd. Mae M4V yn cael ei ddatgodio gan silicon arbenigol ar ffôn, tabled a theledu, a dyna pam mae'n chwarae heb rwygo'r batri. Mae MKV yn arfer mynd yn ôl at ddatgodio meddalwedd ar yr un caledwedd - llwyth CPU uwch, dyfais fwy poeth, a ffrâmau wedi eu gollwng ar ddeunydd 4K. Ar gyfer targed dyfais, M4V yw'r cynhwysydd diogel i aros ynddo. Nid oes gan MKV bron unrhyw gynhaliaeth caledwedd naturiol - mae angen VLC neu remux ar ffôn, porwr a theledu fel arfer cyn y gallant ei chwarae.

Cadw pa un bynnag sy' n cydweddu â lle mae' r ffeil yn mynd, oherwydd nid yw' r naill na' r llall yn well yn y disgrifiad. Adeiladir un o' r ddau yma ar gyfer cydnawsedd chwarae a' r llall ar gyfer cadw popeth y gallai ffeil ei gynnwys, ac maent yn masnachu yn erbyn ei gilydd yn union ar hyd y llinell hon. Y ateb pragmatig ar gyfer y rhan fwyaf o llyfrgelloedd yw archifo yn y cynhwysydd sy' n llawn nodweddion ac allforio i' r un cydnaws ar gais. Mae M4V yn cadw marciau pennod, gwaith celf a traciau isdeitlau yn y ffurf y disgwylir gan y rhaglen Apple TV, sy'n aml yn colli MP4 arferol. MKV yw'r cynhwysydd archif dewisol oherwydd mae'n storio traciau sain diderfyn, isdeitlau meddal, marciau pennod a lluniau cylchdro mewn un ffeil.

It depends on the MKV container. MP4, MOV and MKV output use H.264, which plays on practically every phone, browser and TV. WebM output uses VP9. AVI, WMV and MPEG output use the older codecs those formats were designed for. Matroska yw MKV, cynhwysydd agored a ddyluniwyd yn 2002 heb gyfyngiadau trwydded na therfyn ar yr hyn y gall ei gynnwys.

Yes, the main audio track comes through, re-encoded to a codec the MKV container plays, for example AAC in MP4 and MOV or Opus in WebM. Most conversions keep only that one track (the one with the most channels), so alternate languages and commentary are dropped. MP4 to MOV, and AVI, WMV, MPEG, FLV, VOB or M4V to MKV, keep every audio track.

Yes. The frame rate is kept unless you change it: a 24 fps M4V stays 24 fps in the MKV. The Frame Rate setting can also convert to 60, 30 or 24 fps. It changes the rate only; it does not deinterlace the video or remove 3:2 pulldown.

It depends on what happens to the video. MKV to MP4 or MOV with the default settings copies the video stream unchanged, so the size stays close to the source. Most other pairs re-encode it: a high-bitrate M4V usually comes out smaller, while an already heavily compressed one can grow. Smaller File under Quality gives the smallest output, and H.265 in the Codec setting (MP4, MOV and MKV) is usually smaller than H.264 at similar quality but plays on fewer devices.

MP4 with H.264 plays on practically every phone, browser and TV. MOV with H.264 plays on Apple devices and most TVs but not on every older Android phone. MKV needs an app such as VLC on iOS, and WebM is at home in browsers. There is no device preset on this page, so choose the target format your device supports.

There is no fixed time: it depends on the length, the resolution and the target format. Conversions run on our servers' CPUs with software encoders; there is no GPU acceleration. MKV to MP4 or MOV with the default settings copies the video stream and is the quickest. A re-encode to H.264 takes longer, and WebM (VP9) is the slowest target, several times slower than H.264 in our tests.

The converter has no resolution cap of its own; the limit is the upload size allowed on your plan, and the resolution stays as it is unless you choose 1080p, 720p or 480p. There is no HDR processing or tone mapping. When the video stream is copied (MKV to MP4 or MOV with the default settings), HDR10 passes through untouched. A re-encode drops the HDR10 mastering metadata, and with a Quality, Resolution or Frame Rate setting some pairs also reduce the video to 8-bit colour, so an HDR M4V can look washed out.

Yes. Uploaded M4V files are processed on our own conversion servers, no person reviews them, and they are never shared. The upload and the converted MKV are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.