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Sur d’autres sites (10258)

  • Merge two videos with different HTTP Range header bytes

    5 avril 2022, par Mohammad Momeni

    I want to save 10 seconds from any part of a video by using its URL (without downloading it completely).
the server supports the Range header and it's possible to get specific byte ranges, the video is ok when I save it with something like Range: bytes=0-102400 but when I change the start byte and save a video with Range: bytes=307200-614400 it's no longer playable.

    


    I know maybe it lacks a MIME/header type that should be at the beginning of a file, but the first bytes are not in this response to specify the correct format of the file.
so I saved the video from 0-102400, which is ok and playable, and wanted to get that specific range and somehow append it after the first file to have both a correct file header (less than 1 sec) and that middle part of the video.

    


    first.webm Range : bytes=0-102400 (valid playable file)

    


    middle.webm Range : bytes=307200-614400 (not playable file)

    


    I tried to merge them using this command recommended by this answer

    


    ffmpeg -f concat -i list.txt -c copy merged.webm


    


    logs :

    


    [matroska,webm @ 000002143c3e77c0] File ended prematurely00 bitrate=3752.0kbits/s speed=N/A
[matroska,webm @ 000002143c429e40] Format matroska,webm detected only with low score of 1, misdetection possible!
[matroska,webm @ 000002143c429e40] EBML header parsing failed
[concat @ 000002143c3dda80] Impossible to open 'middle.webm'
list.txt: Invalid data found when processing input
frame=   42 fps=0.0 q=-1.0 Lsize=      10kB time=00:00:01.64 bitrate=  48.7kbits/s speed= 231x    
video:9kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 8.500000%


    


    generated video only shows the first video (which was already playable before merging) and ends.
I inspired this idea from this answer and don't want to download the complete video. If I can't merge them is it possible and how to write a MIME/header for the middle.webm manually to make it a valid playable video ?

    


  • lavc/libopenh264 : Support full range videos in transcoding

    18 avril 2023, par Jun Zhao
    lavc/libopenh264 : Support full range videos in transcoding

    Support full range videos when transcoding, enabled the
    
YUVJ420P to avoid auto scale from YUVJ420P to YUV420P
    

    Signed-off-by : Jun Zhao <barryjzhao@tencent.com>
    • [DH] libavcodec/libopenh264enc.c

  • FFmpeg DLL console command-line wrapper for C# use

    4 novembre 2015, par williamtroup

    I’ve been studying the FFmpeg project for a while, using mainly the command line to generate videos, extract audio, joined videos (etc). I like the flexibility of the command line and its a very useful and fast tool.

    I was wondering, however, would it be possible to convert the C source code for the project and wrap it in a DLL, making the command line callable from a DLL entry point method ?

    Does something like this already exist ?

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