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Sur d’autres sites (9912)

  • Thread Safety of LibAv/FFMpeg ?

    14 septembre 2022, par user71512

    Is LibAV/FFMpeg thread safe ? For example. Could I read from a file using AVFormatContext* in one thread and decode the read packet it in another with simple additions of mutexes or is the thread safetyness of the library a "don't know don't care" type deal ? I know that libav has basic support for encoder threads but I'm trying more of a blackbox type approach where I break it up into multiple threads (Source -> Decoder -> Filter -> Encoder -> Sink) and trying to understand the complications of such.

    


    Anyone with any experience with ffmpeg and threads and would like to chime in with any other info pertinent to this would also be greatly appreciated.

    


  • ffmpeg underutilizes cpu on AWS EC2 instance [closed]

    20 décembre 2024, par Denis

    i'm running video encoding with ffmpeg on EC2 instance (c5.xlarge - 4 vcpus)

    


      ffmpeg \
    -i "$INPUT_URL" \
    -c:v libvpx-vp9 -b:v 1M -threads 4 \
    -tile-columns 1 -frame-parallel 1 \
    -row-mt 1 \
    -cpu-used 0 \
    -quality 1 \
    -speed 3 \
    -r 6 \
    -f segment -segment_time "$SEGMENT_DURATION" -reset_timestamps 1 \
    "$OUTPUT_DIR/$OUTPUT_FILE_PREFIX$(date +%s)%03d.webm" > ffmpeg.log 2>&1 &


    


    I expected the CPU utilization to be around 390%, but I observed it to be around 170% via top

    


    why and what i'm doing wrong ?

    


  • Scripting FFmpeg to move text in y co-ordinate by some delta at specific time-codes

    27 février 2019, par distro.obs

    I’m using the basic drawtext command like this

    ffmpeg -i output.mp4 -vf \
    
'drawtext=textfile='textfile.txt':x=0:y=0 \
    
:fontsize=30:fontcolor=white:borderw=3 \
    
:bordercolor=black:box=0' output.mp4"

    which puts stationary text at location (x, y) = (0,0)

    What I want to do is move this text by 10 points in y plane at certain time codes.

    at 00:00:10, y would be 0
    
at 00:00:11, y would be 10
    
at 00:00:43, y would be 20
    
...
    
...
    
at 00:10:44, y would be 30

    so the ’y’ co-ordinate has a fix increment of 10 at ’keytimes’

    Is there a way to do that ?

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