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• Trying to compile ffmpeg and mpv in Arch Linux : error "undefined reference to pl_log_create_341" [closed]

  4 février 2024, par Mike Nguyen

  Ever since yesterday, I have been struggling to compile ffmpeg, and to a further extent, mpv, on Arch Linux due to the following error that is probably unique to my install :

  


  /usr/bin/ld: libavfilter/libavfilter.so: undefined reference to pl_log_create_341
collect2: error: ld returned 1 exit status
make: *** [Makefile:133: ffplay_g] Error 1
make: *** Waiting for unfinished jobs....
/usr/bin/ld: libavfilter/libavfilter.so: undefined reference to `pl_log_create_341'
collect2: error: ld returned 1 exit status
make: *** [Makefile:133: ffprobe_g] Error 1
/usr/bin/ld: libavfilter/libavfilter.so: undefined reference to `pl_log_create_341'
collect2: error: ld returned 1 exit status
make: *** [Makefile:133: ffmpeg_g] Error 1


  


  I was trying to install mpd on my system, but pacman forced me to remove a ton of essential packages relating to multimedia, Qt, etc. I have since been able to reinstall most of these packages.

  


  However, my ffmpeg has been corrupted (as well as mpv failing to start) due to another error that apparently no one else has been getting (I have searched Google for this) :

  


  symbol lookup error: /usr/lib/libavfilter.so.9: undefined symbol: pl_tone_map_auto


  


  I have both libavfilter.so.9.12.100 and libavfilter.so.9.13.100 in my /usr/lib directory, and I am forced to run sudo ln -s /usr/lib/libavfilter.so.9.12.100 /usr/lib/libavfilter.so.9 every time I run pacman.

  


  I have spent countless hours browsing the web about what solutions are available, but as I said, I seem to be the only one getting these errors.

  


  Whether it's installing ffmpeg-git via the AUR, or removing and reinstalling mpv, nothing seems to fix the problem. And no one else is having this problem.

  


  I might be forced to do a clean install of Arch Linux, but I don't have the time for it.

  


• FFmpeg scale and watermark filters with VAAP gives error "Cannot allocate memory." [closed]

  8 février 2024, par Diz-X

  I'm attempting to transcode any uploaded video on our website into H.264 using an ARC GPU (VAAPI). While I've achieved functionality, ffmpeg crashes after a certain period, displaying the error message : "Error while filtering : Cannot allocate memory."

  


  The following is the ffmpeg command is used transcode videos to H.264 :

  


  


  ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD129 -y -i '/Media/001.mp4' -codec:v h264_vaapi -movflags +faststart -f mp4 -b:v 500k -maxrate 1000k -bufsize 500k -vf "movie=/Watermarks/video-watermark.png,hwupload [watermark] ; [in] scale_vaapi=trunc(iw/2)*2:trunc(ih/2)*2 [scale] ; [scale][watermark] overlay_vaapi=main_w-overlay_w:main_h-overlay_h [out]" -an -pass 1 -passlogfile /tmp/91f13b11b0ccd5195b588fb204da6626 -map_metadata -1 /dev/null

  


  


  We ensure that the video is scaled to the appropriate video dimensions expected by H.264 codec , we use the "scale_vaapi=trunc(iw/2)*2:trunc(ih/2)*2" filter for this. We also apply a watermark to the video using the "overlay_vaapi=main_w-overlay_w:main_h-overlay_h" filter.

  


  If I omit the ",hwupload" after the "movie=" statement, I encounter the following error : "Impossible to convert between the formats supported by the filter 'Parsed_movie_0' and the filter 'auto_scale_0'."

  


  The "-filter-complex" results in the identical error : "Error while filtering : Cannot allocate memory.".

  


  Does anyone have insights on how to enable hardware-accelerated transcoding for this ?

  


• cv2/ffmpeg "grabFrame packet read max attempts exceeded" error after exactly reading certain number of frames

  6 février, par banjaxing

  I am using OpenCV to extract frames from videos, run a segmentation AI model, and save the frames and masks to a folder. When I run my code to extract the frame from I encounter the error "grabFrame packet read max attempts exceeded" after processing a certain number of frames. This issue occurs consistently for the same videos across multiple environments.

  


  Error message :

  


  [ WARN:0@379.898] global cap_ffmpeg_impl.hpp:1541 grabFrame packet read max attempts exceeded, if your video have multiple streams (video, audio) try to increase attempt limit by setting environment variable OPENCV_FFMPEG_READ_ATTEMPTS (current value is 10000)


  


  Minimum Reproducible Example

  


  import os
import cv2

videofilename = "test.mp4"
capture = cv2.VideoCapture(videofilename)
frameNum = 0

createfolder = os.getcwd() + '/' + videofilename.split(".")[0] + '/'
if not os.path.exists(createfolder):
    os.makedirs(createfolder)
    os.makedirs(createfolder + "/frames/")

while True:
    success, frame = capture.read()
    if success is False:
        break
    frameNum += 1
    framedownloadname = videofilename.split(".")[0] + '-fr' + str(frameNum) + '.jpg'
    framedownloadloc = createfolder + '/frames/' + framedownloadname
    print(framedownloadloc)
    cv2.imwrite(framedownloadloc, frame)
    img = cv2.imread(framedownloadloc)
    img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)

capture.release()


  


  As suggested in error, I increased the OPENCV_FFMPEG_READ_ATTEMPTS env variable up to 10000. However, this seems to have little to no effect on the number of frames before the error appears.