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Sur d’autres sites (8379)

  • ffmpeg hls output files - hosting on cdn and conflicting fileNamespaces

    24 avril 2018, par Robert Rowntree

    env - ffmpeg running on cloud
    ffmpeg outputs 2, tmp files < m3u8, binData.ts >

    CDN hosting means the cloud-temp files above need to be uploaded from temp FS on cloud host where ffmpeg is run to final CDN for media. This uploading changes the file names , breaking the fileRef contained in the .m3u8 pointing to ’binData.ts’

    Possible workaround -

    upload binData.ts to the CDN as a single, unacompanied file, wait for CDN response to this file POST , using the response with ’newPrefixCDN-binData.ts’ to run a SED-script editing the original .m3u8 < details on edit below >

    and then uploading the edited m3u8 to the CDN where it correctly points at its binData.ts.

    Im reluctant to code this workaround.

    Is there a better way of doing this ? like using some lib

    Details

    ffmpeg ... -hls_playlist_type vod -hls_segment_filename binData_%03d.ts my.m3u8
    

    
#EXTM3U
    
#EXT-X-VERSION:3
    
#EXT-X-MEDIA-SEQUENCE:0
    
#EXT-X-ALLOW-CACHE:YES
    
#EXT-X-TARGETDURATION:10
    
#EXTINF:10.000000,
    
binData_000.ts

    but then uploading ’binData.ts’ to CDN results in name change to

    /S3-bucket/dd911142f64f-binData_000.ts

    and without an edit , the original m3u8 output from ffmpeg now points at nothing ??

    #EXT-X-TARGETDURATION:10
    
#EXTINF:10.000000,
    
binData_000.ts   ****  changed after upload to CDN, could be edited

    —PS—
    AFAIK .. native, mobile browsers and html5 syntax seem to want 2, related , static files on the CDN that preserve a line in .m3u8 pointing to the static dot-ts file...

    <video class="vjs-tech" tabindex="-1"><source src="https://s3.eu-west-2.amazonaws.com/mybucket/my.m3u8" type="application/x-mpegURL"></source></video>
    
...
    

    
    #EXT-X-TARGETDURATION:10
    
    #EXTINF:10.000000,
    
    {CDN-prefix}-binData_000.ts 
    

    
...

    static file in CDN of type ’.ts’ with the prefixed, CDN name above

    CDN-prefix-binData_000.ts

  • Linux : Create a file for writing with controlled flushing to disk in large chunks [closed]

    12 août 2023, par Pete

    On Linux I have a process (ffmpeg) that writes very slowly (even slower than 1kb / s sometimes) to disk. Ffmpeg can buffer this to 256kb chunks that get written infrequently but ffmpeg hangs occasionally and if I try to detect these hangs by checking that the file is being updated I need to wait a long time between updates, up to 10 or 15 mins, otherwise I can sometimes mistakenly kill the ffmpeg process when it appears to have stopped writing when it fact its still filling its internal buffer.

    &#xA;

    Theres no way to detect this it seems unless I use strace (that I can find anyway). So I am wondering about turning off buffering in ffmpeg and writing unbuffered to disk from ffmpeg.

    &#xA;

    This will result in the disk constantly making tiny writes and wasting power (and probably, if I use a SSD, mess with wear levelling too).

    &#xA;

    So I would like to make ffmpeg write to a 'virtual file' (in memory - either kernel memory or a process) which I can specify the flushing characteristics of. The idea being to perhaps specify flush every 2 minutes, then I can keep an eye on the file size and make sure its still being written.

    &#xA;

    I don't think I've missed any other ways to do this job - even if I could watch the socket stream incoming to ffpmeg the process itself could still stop writing and lose data. Doing the buffering outside of ffmpeg seems like the best way.

    &#xA;

    Is there a built in way to do this in Linux or does it mean a custom process ? I guess I know how to do this with a small C program and pipe the data in but I wonder if theres a neater way.

    &#xA;

  • lavu/tx : improve 3-point fixed precision

    14 février 2020, par Lynne
    lavu/tx : improve 3-point fixed precision

    There's just no reason not to when its so easy (albeit messy) and its also
    
reducing the precision of all non-power-of-two transforms that use it.
    • [DH] libavutil/tx_priv.h
    • [DH] libavutil/tx_template.c

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