resolve_convert.sh misdetects video files as audio-only due to trailing comma in ffprobe CSV output

Description

The get_media_type function in resolve_convert.sh uses ffprobe -of csv=p=0 to detect whether a
file contains video or audio. However, the CSV output format includes a trailing comma (e.g.,
video, instead of video), causing the string comparison [[ "$has_video" == "video" ]] to fail.
As a result, video files are incorrectly detected as audio-only and converted to .wav instead
of .mov.

Steps to Reproduce

1. Place a video file (e.g., DJI drone MP4) in a folder
2. Run ./resolve_convert.sh /path/to/folder
3. Observe that some files are converted to .wav instead of .mov

Minimal Reproduction

  # This is what the script currently does:
  $ ffprobe -v quiet -select_streams v:0 -show_entries stream=codec_type -of csv=p=0 file.mp4 |
head -1
  video,

  # The trailing comma causes this comparison to fail:
  $ [[ "video," == "video" ]]; echo $?
  1

Expected Behavior

Video files should be detected as video and converted to .mov with DNxHR + PCM audio.

Actual Behavior

Video files are detected as audio and converted to .wav (audio-only), losing the video stream
entirely.

Root Cause

In get_media_type():

  has_video=$(ffprobe -v quiet -select_streams v:0 \
    -show_entries stream=codec_type -of csv=p=0 "$file" 2>/dev/null | head -1)

csv=p=0 outputs video, (with trailing comma). The comparison [[ "$has_video" == "video" ]]
fails, falling through to the audio branch.

Environment

• OS: Arch Linux / CachyOS
• ffmpeg version: 7.x
• Script version: Latest main branch

Suggested Fix

Strip trailing commas from ffprobe output:

  has_video=$(ffprobe -v quiet -select_streams v:0 \
    -show_entries stream=codec_type -of csv=p=0 "$file" 2>/dev/null | head -1 | sed 's/,$//')
  has_audio=$(ffprobe -v quiet -select_streams a:0 \
    -show_entries stream=codec_type -of csv=p=0 "$file" 2>/dev/null | head -1 | sed 's/,$//')

Start in resolve_convert.sh at the get_media_type function and reproduce the ffprobe CSV output described in the issue. Verify that video files are classified as video and converted to .mov, while audio-only files remain eligible for .wav conversion.