// From pad-added callback when decodebin creates new pads
let caps = src_pad.current_caps().unwrap();
let struct_ = caps.structure(0).unwrap();
let width = struct_.get::<i32>("width").unwrap_or(1920) as u32;
let height = struct_.get::<i32>("height").unwrap_or(1080) as u32;
thank you! seems you need to see the video to understand this issue, I see. Unfortunately, the video is from a sensitive psychotherapy session, so I cannot share it on the web. The video was recorded with two special cameras for a scientific project. However, the final video was created using the script I wrote below. I will try to reproduce this issue with a “dummy” video and share it on GitLab, but the script I wrote works fine for my own regular videos.
If I can do that, I’ll create a new thread on GitLab and add the link here. Thank you all!
# Enes Altun, August 14, 2022, MIT LICENCE
# A script to merge two videos side-by-side
OUTPUT_HEIGHT=1080
OUTPUT_FILE_PREFIX="merged_sbs"
function show_usage() {
echo "Usage: ./merge_videos.sh <video1> <video2> [--mute1 | --mute2 | --mix]"
echo ""
echo "Options:"
echo " --mute1 Mute the first video and use audio from the second."
echo " --mute2 Mute the second video and use audio from the first."
echo " --mix Mix the audio from both videos together."
echo ""
echo "Example:"
echo " ./merge_videos.sh left_cam.mp4 right_cam.mov --mute2"
}
function has_audio() {
ffprobe -v error -select_streams a:0 -show_entries stream=codec_type \
-of default=noprint_wrappers=1:nokey=1 "$1" 2>/dev/null | grep -q audio
}
if ! command -v ffmpeg &> /dev/null; then
echo "Error: ffmpeg is not installed or not in your system's PATH."
exit 1
fi
if [ "$#" -ne 3 ]; then
show_usage
exit 1
fi
VIDEO1="$1"
VIDEO2="$2"
AUDIO_OPTION="$3"
if [ ! -f "$VIDEO1" ]; then
echo "Error: Input file not found: '$VIDEO1'"
exit 1
fi
if [ ! -f "$VIDEO2" ]; then
echo "Error: Input file not found: '$VIDEO2'"
exit 1
fi
HAS_AUDIO1=false
HAS_AUDIO2=false
has_audio "$VIDEO1" && HAS_AUDIO1=true
has_audio "$VIDEO2" && HAS_AUDIO2=true
echo "Video1 has audio: $HAS_AUDIO1"
echo "Video2 has audio: $HAS_AUDIO2"
echo "Inputs validated. Preparing to merge videos..."
VIDEO_FILTER="[0:v]scale=-2:${OUTPUT_HEIGHT}[v0];[1:v]scale=-2:${OUTPUT_HEIGHT}[v1];[v0][v1]hstack=inputs=2:shortest=0[v]"
case "$AUDIO_OPTION" in
--mute1)
echo "Using audio from the second video ('$VIDEO2')."
if $HAS_AUDIO2; then
FILTER_COMPLEX="${VIDEO_FILTER}; anullsrc=channel_layout=stereo:sample_rate=44100[sil1]; [sil1][1:a:0]amix=inputs=2[aout]"
else
FILTER_COMPLEX="${VIDEO_FILTER}; anullsrc=channel_layout=stereo:sample_rate=44100[aout]"
fi
;;
--mute2)
echo "Using audio from the first video ('$VIDEO1')."
if $HAS_AUDIO1; then
FILTER_COMPLEX="${VIDEO_FILTER}; anullsrc=channel_layout=stereo:sample_rate=44100[sil2]; [0:a:0][sil2]amix=inputs=2[aout]"
else
FILTER_COMPLEX="${VIDEO_FILTER}; anullsrc=channel_layout=stereo:sample_rate=44100[aout]"
fi
;;
--mix)
echo "Mixing audio from both videos."
if $HAS_AUDIO1 && $HAS_AUDIO2; then
FILTER_COMPLEX="${VIDEO_FILTER}; [0:a:0][1:a:0]amix=inputs=2[aout]"
elif $HAS_AUDIO1; then
FILTER_COMPLEX="${VIDEO_FILTER}; anullsrc=channel_layout=stereo:sample_rate=44100[sil2]; [0:a:0][sil2]amix=inputs=2[aout]"
elif $HAS_AUDIO2; then
FILTER_COMPLEX="${VIDEO_FILTER}; anullsrc=channel_layout=stereo:sample_rate=44100[sil1]; [sil1][1:a:0]amix=inputs=2[aout]"
else
FILTER_COMPLEX="${VIDEO_FILTER}; anullsrc=channel_layout=stereo:sample_rate=44100[aout]"
fi
;;
*)
echo "Error: Invalid audio option '$AUDIO_OPTION'."
show_usage
exit 1
;;
esac
TIMESTAMP=$(date +%Y%m%d_%H%M%S)
OUTPUT_FILE="${OUTPUT_FILE_PREFIX}_${TIMESTAMP}.mp4"
echo "Output will be saved to: $OUTPUT_FILE"
echo "Processing... This may take a while depending on video length and your computer's speed."
ffmpeg \
-i "$VIDEO1" \
-i "$VIDEO2" \
-filter_complex "$FILTER_COMPLEX" \
-map "[v]" \
-map "[aout]" \
-c:v libx264 \
-preset veryfast \
-crf 23 \
-c:a aac \
-b:a 192k \
-pix_fmt yuv420p \
-shortest \
-y \
"$OUTPUT_FILE"
if [ $? -eq 0 ]; then
echo ""
echo "Success! Video merged successfully."
echo "Output file: $OUTPUT_FILE"
else
echo ""
echo "Error: FFmpeg failed to process the videos."
exit 1
fi
Yeah there seems to be something specifically wrong with that video.
You could share the “headers” only, specifically the moov box which you can find either at the beginning (goes until the string mdat then), or at the very end of the file. That wouldn’t contain any sensitive media data.
