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Q&A ffmpeg script outputs video with unexpected resolution and frame rate despite scaling and fps filtering

I'm having trouble with an ffmpeg script that's supposed to convert videos to a specific resolution and frame rate, but the output video has unexpected dimensions and frame rate. Here's my script a...

2 answers · posted 2mo ago by ShadowsRanger‭ · last activity 1mo ago by harmony‭

Question bash ffmpeg

#3: Post edited by

ShadowsRanger‭ · 2024-09-29T15:50:24Z (about 2 months ago)

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I'm having trouble with an ffmpeg script that's supposed to convert videos to a specific resolution and frame rate, but the output video has unexpected dimensions and frame rate. Here's my script and the issue:
```bash
#!/usr/bin/env bash
# Constants
MAX_RESOLUTION=540
MAX_FPS=15
MAX_BITRATE="500k"
CRF_VALUE=30
AUDIO_BITRATE="64k"
# Check if the directory argument is provided
if [ $# -eq 0 ]; then
echo "Usage: $0 <directory>"
exit 1
fi
TARGET_DIR="$1"
# Function to log messages
log() {
echo "$(date '+%Y-%m-%d %H:%M:%S') - $1"
}
# Function to handle errors
handle_error() {
log "Error occurred: $1"
exit 1
}
for FILE in $(find "$TARGET_DIR" -type f $ -iname "*.mp4" -o -iname "*.mkv" -o -iname "*.avi" -o -iname "*.mov" -o -iname "*.m4v" -o -iname "*.wmv" $); do
log "Processing: $FILE"
# Get video dimensions and frame rate
DIMENSIONS=$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 "$FILE")
WIDTH=$(echo $DIMENSIONS | cut -d'x' -f1)
HEIGHT=$(echo $DIMENSIONS | cut -d'x' -f2)
FPS=$(ffprobe -v error -select_streams v:0 -count_packets -show_entries stream=r_frame_rate -of csv=p=0 "$FILE" | bc -l | awk '{printf("%d\n",$1 + 0.5)}')
# Determine scaling only if necessary
SCALING=""
if [ $WIDTH -lt $HEIGHT ]; then
SHORTER_SIDE=$WIDTH
if [ $WIDTH -gt $MAX_RESOLUTION ]; then
SCALING="-vf scale=$MAX_RESOLUTION:-2"
fi
else
SHORTER_SIDE=$HEIGHT
if [ $HEIGHT -gt $MAX_RESOLUTION ]; then
SCALING="-vf scale=-2:$MAX_RESOLUTION"
fi
fi
# Add fps filter only if necessary
FPS_FILTER=""
if [ $FPS -gt $MAX_FPS ]; then
FPS_FILTER="-vf fps=$MAX_FPS"
fi
# Get codec info
CODEC_INFO=$(ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 "$FILE")
# Check if conversion is needed
if [[ "$CODEC_INFO" != "hevc" && "$CODEC_INFO" != "h265" ]] || [ "$FPS" -gt "$MAX_FPS" ] || [ $SHORTER_SIDE -gt $MAX_RESOLUTION ]; then
OUTPUT_FILE="${FILE%.*}.h265.mkv"
# Combine scaling, FPS filtering, and codec selection
ffmpeg_cmd=(
"-i" "$FILE"
$SCALING
$FPS_FILTER
"-c:v" "libx265"
"-preset" "slow"
"-crf" "$CRF_VALUE"
"-c:a" "aac"
"-b:a" "$AUDIO_BITRATE"
"-movflags" "+faststart"
"$OUTPUT_FILE"
)
log "Executing FFmpeg command: ${ffmpeg_cmd[*]}"
ffmpeg "${ffmpeg_cmd[@]}" || handle_error "FFmpeg failed to encode $FILE"
log "Conversion completed successfully."
else
log "No conversion needed for $FILE"
fi
done
```
The problem is that the output video has a different resolution and frame rate than I expect:
```
Input #0
Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67), 3840x2160, 94843 kb/s, 59.98 fps, 60 tbr, 600 tbn (default)
Output #0
Stream #0:0(und): Video: hevc, yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67, progressive), 406x720, q=2-31, 1000 kb/s, 60 fps, 1k tbn (default)
```
The output is 406x720 instead of the expected 1080x720, and 60 fps instead of the desired 30 fps. How can I fix this issue?
Please help me understand why this is happening and how to achieve the desired output resolution and frame rate.

I'm having trouble with an ffmpeg script that's supposed to convert videos to a specific resolution and frame rate, but the output video has unexpected dimensions and frame rate. Here's my script and the issue:
```bash
#!/usr/bin/env bash
# Constants
MAX_RESOLUTION=540
MAX_FPS=15
MAX_BITRATE="500k"
CRF_VALUE=30
AUDIO_BITRATE="64k"
# Check if the directory argument is provided
if [ $# -eq 0 ]; then
echo "Usage: $0 <directory>"
exit 1
fi
TARGET_DIR="$1"
# Function to log messages
log() {
echo "$(date '+%Y-%m-%d %H:%M:%S') - $1"
}
# Function to handle errors
handle_error() {
log "Error occurred: $1"
exit 1
}
for FILE in $(find "$TARGET_DIR" -type f $ -iname "*.mp4" -o -iname "*.mkv" -o -iname "*.avi" -o -iname "*.mov" -o -iname "*.m4v" -o -iname "*.wmv" $); do
log "Processing: $FILE"
# Get video dimensions and frame rate
DIMENSIONS=$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 "$FILE")
WIDTH=$(echo $DIMENSIONS | cut -d'x' -f1)
HEIGHT=$(echo $DIMENSIONS | cut -d'x' -f2)
FPS=$(ffprobe -v error -select_streams v:0 -count_packets -show_entries stream=r_frame_rate -of csv=p=0 "$FILE" | bc -l | awk '{printf("%d\n",$1 + 0.5)}')
# Determine scaling only if necessary
SCALING=""
if [ $WIDTH -lt $HEIGHT ]; then
SHORTER_SIDE=$WIDTH
if [ $WIDTH -gt $MAX_RESOLUTION ]; then
SCALING="-vf scale=$MAX_RESOLUTION:-2"
fi
else
SHORTER_SIDE=$HEIGHT
if [ $HEIGHT -gt $MAX_RESOLUTION ]; then
SCALING="-vf scale=-2:$MAX_RESOLUTION"
fi
fi
# Add fps filter only if necessary
FPS_FILTER=""
if [ $FPS -gt $MAX_FPS ]; then
FPS_FILTER="-vf fps=$MAX_FPS"
fi
# Get codec info
CODEC_INFO=$(ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 "$FILE")
# Check if conversion is needed
if [[ "$CODEC_INFO" != "hevc" && "$CODEC_INFO" != "h265" ]] || [ "$FPS" -gt "$MAX_FPS" ] || [ $SHORTER_SIDE -gt $MAX_RESOLUTION ]; then
OUTPUT_FILE="${FILE%.*}.h265.mkv"
# Combine scaling, FPS filtering, and codec selection
ffmpeg_cmd=(
"-i" "$FILE"
$SCALING
$FPS_FILTER
"-c:v" "libx265"
"-preset" "slow"
"-crf" "$CRF_VALUE"
"-c:a" "aac"
"-b:a" "$AUDIO_BITRATE"
"-movflags" "+faststart"
"$OUTPUT_FILE"
)
log "Executing FFmpeg command: ${ffmpeg_cmd[*]}"
ffmpeg "${ffmpeg_cmd[@]}" || handle_error "FFmpeg failed to encode $FILE"
log "Conversion completed successfully."
else
log "No conversion needed for $FILE"
fi
done
```
The problem is that the output video has a different resolution and frame rate than I expect:
```
Input #0
Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67), 3840x2160, 94843 kb/s, 59.98 fps, 60 tbr, 600 tbn (default)
Output #0
Stream #0:0(und): Video: hevc, yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67, progressive), 406x720, q=2-31, 1000 kb/s, 60 fps, 1k tbn (default)
❯ ffprobe -v error -select_streams v:0 -count_packets -show_entries stream=r_frame_rate -of csv=p=0 "$FILE"
60/1,
❯ ffprobe -v error -select_streams v:0 -count_packets -show_entries stream=r_frame_rate -of csv=p=0 "$FILE" | bc -l | awk '{printf("%d\n",$1 + 0.5)}'
(standard_in) 1: syntax error
```
The output is 406x720 instead of the expected 1080x720, and 60 fps instead of the desired 30 fps. How can I fix this issue?
Please help me understand why this is happening and how to achieve the desired output resolution and frame rate.

#2: Post edited by

ShadowsRanger‭ · 2024-09-29T15:44:53Z (about 2 months ago)

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I'm having trouble with an ffmpeg script that's supposed to convert videos to a specific resolution and frame rate, but the output video has unexpected dimensions and frame rate. Here's my script and the issue:
```bash
#!/usr/bin/env bash
if [ $# -eq 0 ]; then
echo "Usage: $0 <directory>"
exit 1
fi
~~MAX_RESOLUTION=720~~
~~MAX_FPS=30~~
TARGET_DIR="$1"
~~MAX_BITRATE="1M"~~
~~CRF_VALUE=28~~
~~AUDIO_BITRATE="128k"~~
~~# Find all video files recursively in the given directory~~
~~find "$TARGET_DIR" -type f $ -iname "*.mp4" -o -iname "*.mkv" -o -iname "*.avi" -o -iname "*.mov" -o -iname "*.m4v" -o -iname "*.wmv" $ -print0 | while IFS= read -r -d '' FILE; do~~
CODEC_INFO=$(ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 "$FILE")
~~BASENAME=$(basename -- "$FILE")~~
~~NAME="${BASENAME%.*}"~~
~~EXT="${BASENAME##*.}"~~
~~OUTPUT_FILE="${FILE%.*}.h265.mkv"~~
DIMENSIONS=$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 "$FILE")
WIDTH=$(echo $DIMENSIONS | cut -d'x' -f1)
HEIGHT=$(echo $DIMENSIONS | cut -d'x' -f2)
FPS=$(ffprobe -v error -select_streams v:0 -count_packets -show_entries stream=r_frame_rate -of csv=p=0 "$FILE" | bc -l | awk '{printf("%d\n",$1 + 0.5)}')
SCALING=""
if [ $WIDTH -lt $HEIGHT ]; then
SHORTER_SIDE=$WIDTH
if [ $WIDTH -gt $MAX_RESOLUTION ]; then
SCALING="-vf scale=$MAX_RESOLUTION:-2"
fi
else
SHORTER_SIDE=$HEIGHT
if [ $HEIGHT -gt $MAX_RESOLUTION ]; then
SCALING="-vf scale=-2:$MAX_RESOLUTION"
fi
fi
FPS_FILTER=""
if [ $FPS -gt $MAX_FPS ]; then
FPS_FILTER="-vf fps=$MAX_FPS"
fi
if [[ "$CODEC_INFO" != "hevc" && "$CODEC_INFO" != "h265" ]] || [ "$FPS" -gt "$MAX_FPS" ] || [ $SHORTER_SIDE -gt $MAX_RESOLUTION ]; then
~~ffmpeg -i "$FILE" $SCALING $FPS_FILTER -c:v libx265 -b:v $MAX_BITRATE -crf $CRF_VALUE -c:a aac -b:a $AUDIO_BITRATE -preset slow "$OUTPUT_FILE"~~
fi
done
```
The problem is that the output video has a different resolution and frame rate than I expect:
```
Input #0
Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67), 3840x2160, 94843 kb/s, 59.98 fps, 60 tbr, 600 tbn (default)
Output #0
Stream #0:0(und): Video: hevc, yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67, progressive), 406x720, q=2-31, 1000 kb/s, 60 fps, 1k tbn (default)
```
The output is 406x720 instead of the expected 1080x720, and 60 fps instead of the desired 30 fps. How can I fix this issue?
Please help me understand why this is happening and how to achieve the desired output resolution and frame rate.

I'm having trouble with an ffmpeg script that's supposed to convert videos to a specific resolution and frame rate, but the output video has unexpected dimensions and frame rate. Here's my script and the issue:
```bash
#!/usr/bin/env bash
# Constants
MAX_RESOLUTION=540
MAX_FPS=15
MAX_BITRATE="500k"
CRF_VALUE=30
AUDIO_BITRATE="64k"
# Check if the directory argument is provided
if [ $# -eq 0 ]; then
echo "Usage: $0 <directory>"
exit 1
fi
TARGET_DIR="$1"
# Function to log messages
log() {
echo "$(date '+%Y-%m-%d %H:%M:%S') - $1"
}
# Function to handle errors
handle_error() {
log "Error occurred: $1"
exit 1
}
for FILE in $(find "$TARGET_DIR" -type f $ -iname "*.mp4" -o -iname "*.mkv" -o -iname "*.avi" -o -iname "*.mov" -o -iname "*.m4v" -o -iname "*.wmv" $); do
log "Processing: $FILE"
# Get video dimensions and frame rate
DIMENSIONS=$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 "$FILE")
WIDTH=$(echo $DIMENSIONS | cut -d'x' -f1)
HEIGHT=$(echo $DIMENSIONS | cut -d'x' -f2)
FPS=$(ffprobe -v error -select_streams v:0 -count_packets -show_entries stream=r_frame_rate -of csv=p=0 "$FILE" | bc -l | awk '{printf("%d\n",$1 + 0.5)}')
# Determine scaling only if necessary
SCALING=""
if [ $WIDTH -lt $HEIGHT ]; then
SHORTER_SIDE=$WIDTH
if [ $WIDTH -gt $MAX_RESOLUTION ]; then
SCALING="-vf scale=$MAX_RESOLUTION:-2"
fi
else
SHORTER_SIDE=$HEIGHT
if [ $HEIGHT -gt $MAX_RESOLUTION ]; then
SCALING="-vf scale=-2:$MAX_RESOLUTION"
fi
fi
# Add fps filter only if necessary
FPS_FILTER=""
if [ $FPS -gt $MAX_FPS ]; then
FPS_FILTER="-vf fps=$MAX_FPS"
fi
# Get codec info
CODEC_INFO=$(ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 "$FILE")
# Check if conversion is needed
if [[ "$CODEC_INFO" != "hevc" && "$CODEC_INFO" != "h265" ]] || [ "$FPS" -gt "$MAX_FPS" ] || [ $SHORTER_SIDE -gt $MAX_RESOLUTION ]; then
OUTPUT_FILE="${FILE%.*}.h265.mkv"
# Combine scaling, FPS filtering, and codec selection
ffmpeg_cmd=(
"-i" "$FILE"
$SCALING
$FPS_FILTER
"-c:v" "libx265"
"-preset" "slow"
"-crf" "$CRF_VALUE"
"-c:a" "aac"
"-b:a" "$AUDIO_BITRATE"
"-movflags" "+faststart"
"$OUTPUT_FILE"
)
log "Executing FFmpeg command: ${ffmpeg_cmd[*]}"
ffmpeg "${ffmpeg_cmd[@]}" || handle_error "FFmpeg failed to encode $FILE"
log "Conversion completed successfully."
else
log "No conversion needed for $FILE"
fi
done
```
The problem is that the output video has a different resolution and frame rate than I expect:
```
Input #0
Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67), 3840x2160, 94843 kb/s, 59.98 fps, 60 tbr, 600 tbn (default)
Output #0
Stream #0:0(und): Video: hevc, yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67, progressive), 406x720, q=2-31, 1000 kb/s, 60 fps, 1k tbn (default)
```
The output is 406x720 instead of the expected 1080x720, and 60 fps instead of the desired 30 fps. How can I fix this issue?
Please help me understand why this is happening and how to achieve the desired output resolution and frame rate.

#1: Initial revision by

ShadowsRanger‭ · 2024-09-29T15:27:49Z (about 2 months ago)

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ffmpeg script outputs video with unexpected resolution and frame rate despite scaling and fps filtering

I'm having trouble with an ffmpeg script that's supposed to convert videos to a specific resolution and frame rate, but the output video has unexpected dimensions and frame rate. Here's my script and the issue:

```bash
#!/usr/bin/env bash

if [ $# -eq 0 ]; then
    echo "Usage: $0 <directory>"
    exit 1
fi

MAX_RESOLUTION=720
MAX_FPS=30
TARGET_DIR="$1"
MAX_BITRATE="1M"
CRF_VALUE=28
AUDIO_BITRATE="128k"

# Find all video files recursively in the given directory
find "$TARGET_DIR" -type f \( -iname "*.mp4" -o -iname "*.mkv" -o -iname "*.avi" -o -iname "*.mov" -o -iname "*.m4v" -o -iname "*.wmv" \) -print0 | while IFS= read -r -d '' FILE; do
    CODEC_INFO=$(ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 "$FILE")
    
    BASENAME=$(basename -- "$FILE")
    NAME="${BASENAME%.*}"
    EXT="${BASENAME##*.}"
    
    OUTPUT_FILE="${FILE%.*}.h265.mkv"
    
    DIMENSIONS=$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 "$FILE")
    WIDTH=$(echo $DIMENSIONS | cut -d'x' -f1)
    HEIGHT=$(echo $DIMENSIONS | cut -d'x' -f2)
    FPS=$(ffprobe -v error -select_streams v:0 -count_packets -show_entries stream=r_frame_rate -of csv=p=0 "$FILE" | bc -l | awk '{printf("%d\n",$1 + 0.5)}')
    
    SCALING=""
    if [ $WIDTH -lt $HEIGHT ]; then
        SHORTER_SIDE=$WIDTH
        if [ $WIDTH -gt $MAX_RESOLUTION ]; then
            SCALING="-vf scale=$MAX_RESOLUTION:-2"
        fi
    else
        SHORTER_SIDE=$HEIGHT
        if [ $HEIGHT -gt $MAX_RESOLUTION ]; then
            SCALING="-vf scale=-2:$MAX_RESOLUTION"
        fi
    fi

    FPS_FILTER=""
    if [ $FPS -gt $MAX_FPS ]; then
        FPS_FILTER="-vf fps=$MAX_FPS"
    fi

    if [[ "$CODEC_INFO" != "hevc" && "$CODEC_INFO" != "h265" ]] || [ "$FPS" -gt "$MAX_FPS" ] || [ $SHORTER_SIDE -gt $MAX_RESOLUTION ]; then
        ffmpeg -i "$FILE" $SCALING $FPS_FILTER -c:v libx265 -b:v $MAX_BITRATE -crf $CRF_VALUE -c:a aac -b:a $AUDIO_BITRATE -preset slow "$OUTPUT_FILE"
    fi
done
```

The problem is that the output video has a different resolution and frame rate than I expect:

```
Input #0
  Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67), 3840x2160, 94843 kb/s, 59.98 fps, 60 tbr, 600 tbn (default)

Output #0
  Stream #0:0(und): Video: hevc, yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67, progressive), 406x720, q=2-31, 1000 kb/s, 60 fps, 1k tbn (default)
```

The output is 406x720 instead of the expected 1080x720, and 60 fps instead of the desired 30 fps. How can I fix this issue?

Please help me understand why this is happening and how to achieve the desired output resolution and frame rate.

bash ffmpeg

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