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Autres articles (42)

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Sur d’autres sites (4976)

  • Single M3U8 playlist file with different bitrate support

    22 avril 2017, par SetV

    I need to share a m3u8 playlist with support for different bitrate and resolution.

    The master playlist consist of different bitrate playlist.

    #EXTM3U
    
#EXT-X-STREAM-INF:BANDWIDTH=256000
    
bbb_30sec_256.m3u8
    
#EXT-X-STREAM-INF:BANDWIDTH=768000
    
bbb_30sec_768.m3u8

    Instead is it possible to get a single playlist with all bitrates files included.

    #EXTM3U
    
#EXT-X-VERSION:3
    
#EXT-X-MEDIA-SEQUENCE:0
    
#EXT-X-ALLOW-CACHE:YES
    
#EXT-X-TARGETDURATION:16
    
#EXT-X-STREAM-INF:BANDWIDTH=256000,RESOLUTION=480x270
    
#EXTINF:15.833333,
    
bbb_30sec_256_00000.ts
    
#EXTINF:14.250000,
    
bbb_30sec_256_00001.ts
    
#EXT-X-STREAM-INF:BANDWIDTH=768000,RESOLUTION=640x360 
    
#EXTINF:15.833333,
    
bbb_30sec_768_00000.ts
    
#EXTINF:14.250000,
    
bbb_30sec_768_00001.ts

    Apple HLS document doesn’t gave any scope for that. I was curious to know is this can be achieved in any other possible way ?

  • Get 'creation_time' of video using ffmpeg and regex

    5 février 2014, par Foysal

    I have a metadata text of a video file which is produced by ffmpeg.

    Metadata:
    
    major_brand     : qt  
    
    minor_version   : 0
    
    compatible_brands: qt  
    
    creation_time   : 2011-09-10 21:44:22
    
    model           : iPhone 4
    
    model-deu       : iPhone 4
    
    encoder         : 4.3.5
    
    encoder-deu     : 4.3.5
    
    date            : 2011-09-10T17:44:22-0400
    
    date-deu        : 2011-09-10T17:44:22-0400
    
    location        : +40.7329-073.9864/
    
    location-deu    : +40.7329-073.9864/
    
    make            : Apple
    
    make-deu        : Apple

    I want to get the *'creation_time'* value using regex of the above text. I am using C#.

  • Write Live Photo metadata to video using FFMPEG

    13 août 2021, par Luke Burns

    According to Apple Live Photo file format, there are three pieces of metadata that need to be written for a JPEG and MOV to be accepted as a live photo. I can use exiftool and ffmpeg to write the necessary content identifier metadata.

    


    For the JPEG :

    


    exiftool -TagsFromFile reference.jpeg -makernotes -ContentIdentifier image.jpeg
exiftool -ContentIdentifier="$id" image.jpeg


    


    Similarly, ffmpeg can be used to write the top-level Quicktime metadata with matching id.

    


    However I'm having trouble with the timed metadata : ["com.apple.quicktime.still-image-time" : 0xFF].

    


    I can't even manage to produce a copy of an existing live photo MOV file using ffmpeg that preserves the necessary timed metadata.

    


    ffmpeg -i original.mov -map 0 -c copy -movflags use_metadata_tags copy.mov


    


    copies the global metadata (i.e. com.apple.quicktime.content.identifier), but loses the necessary still-image-time which can be confirmed using exiftool :

    


    > exiftool -G -U -ee original.mov | grep 'Still Image Time'
[QuickTime]     Still Image Time                : -1
> exiftool -G -U -ee copy.mov | grep 'Still Image Time'
> 


    


    How can I write the timed metadata using ffmpeg—specifically the still-image-time data ?

    


    Edit : it looks like this may be happening because ffmpeg does not know how to handle the mebx tag on data streams :

    


    [mov @ 0x7fb232091400] Unknown hldr_type for mebx, writing dummy values


    


    And ffmpeg doesn't seem to have a way to copy unknown streams. This appears to also be a problem for dealing with the fdsc tag in GoPro metadata streams (e.g. see https://gist.github.com/radimklaska/8974637522a751adb49db0de3be482c9#file-gopro_hevc_to_dnxhd-sh-L125), so it's often copied over as gpmd data, which ensures it's not overwritten with dummy values, but this trick doesn't work in the case of live photos mebx metadata.

    


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