#利用簡單工具進行客觀視頻質量分析shell
ffmpeg, eavlvidbash
其中eavlvid的下載地址:http://www2.tkn.tu-berlin.de/research/evalvid/EvalVid/evalvid-2.7.tar.bz2工具
其實只使用了psnr,編譯的時候,用「make psnr」便可。編碼
psnr命令行使用方法: psnr x y <YUV format> <src.yuv> <dst.yuv> [multiplex] [ssim]命令行
例如: ./psnr 1920 1080 420 haoshengyin_420.yuv qsv-1080p.yuv ssim > qsv_ssim.csv設計
源YUV文件 -> ffmpeg編碼(硬編或軟編)-> ffmpeg解碼生成YUV文件 -> YUV文件比對,生成psnr和ssim數據 -> 圖表分析數據 -> 得出結論code
編碼語言用shell便可。orm
用例生成模塊:視頻
因子: 編碼方式(軟編或硬編), 碼率, GOP值, preset, profile, 生成用例 -> 調用單個文件比對單元ip
單個文件比對單元:
源YUV文件 -> ffmpeg編碼 -> 解碼成YUV -> 利用工具獲取yuv比對數據 -> 刪除解碼生成的yuv文件 傳入參數: 源YUV文件路徑, YUV比對數據路徑, 編碼方式(軟編或硬編), 碼率, GOP值, preset, profile
#!/bin/bash # functions function exit_if_error() { if [ "$?" != "0" ]; then echo "error!!!!! " echo "++++++++++stack top++++++++++" declare i declare level=${#FUNCNAME[@]} for((i=1;i<level;i++)) do [ x"${FUNCNAME[$i]}" != x ] && \ echo -e "in ${FUNCNAME[$i]}() at ${BASH_SOURCE[$i]}: ${BASH_LINENO[((i-1))]}" done echo "----------stack buttom-------" exit 1 fi } function do_one_analysis() { echo "use encode_type:"$1 "bit_rate:"$2 "gop_size:"$3 "preset:"$4 "profile:"$5 encode_type=$1 bit_rate=$2 gop_size=$3 preset=$4 profile=$5 # to generate ffmpeg command, #e.g: ./ffmpeg -s 1920x1080 -i haoshengyin_420.yuv -vcodec h264_qsv -b 1000k -s 1280x720 -f mp4 -y qsv.mp4 dst_path="$dst_dir/${encode_type}_${bit_rate}_gop${gop_size}_${preset}_${profile}.mp4" encod_cmd="${ffmpeg_path} -s ${src_width}x${src_height} -i $src_yuv -vcodec $encode_type -b $bit_rate -s ${src_width}x${src_height} -g ${gop_size} -preset $preset -profile $profile -f mp4 -y $dst_path" echo "encod_cmd: $encod_cmd" # to encode ${ffmpeg_path} -s ${src_width}x${src_height} -i $src_yuv -vcodec $encode_type -b $bit_rate -s ${src_width}x${src_height} -g ${gop_size} -preset $preset -profile $profile -f mp4 -y $dst_path exit_if_error dst_yuv_path="${dst_path}.yuv" decode_com="${ffmpeg_path} -i ${dst_path} -pix_fmt yuv420p -y ${dst_yuv_path}" echo "decode_com: $decode_com" # to decode ${ffmpeg_path} -i ${dst_path} -pix_fmt yuv420p -y ${dst_yuv_path} exit_if_error # to generate analysis cmd # e.g: ./psnr 1920 1080 420 haoshengyin_420.yuv qsv-1080p.yuv ssim > qsv_ssim.csv analysis_cmd_psnr="${analysis_bin} ${src_width} ${src_height} 420 ${src_yuv} ${dst_yuv_path} > ${dst_path}_psnr.csv" echo "analysis_cmd_psnr:${analysis_cmd_psnr}" ${analysis_bin} ${src_width} ${src_height} 420 ${src_yuv} ${dst_yuv_path} > ${dst_path}_psnr.csv exit_if_error analysis_cmd_ssim="${analysis_bin} ${src_width} ${src_height} 420 ${src_yuv} ${dst_yuv_path} ssim > ${dst_path}_ssim.csv" echo "analysis_cmd_ssim:${analysis_cmd_ssim}" ${analysis_bin} ${src_width} ${src_height} 420 ${src_yuv} ${dst_yuv_path} ssim > ${dst_path}_ssim.csv exit_if_error # clean the no need yuv file rm -rf ${dst_yuv_path} } function Analysis() { echo "Analysis begin" for rate in $g_bit_rate do #echo "use bit_rate:"$rate for gop in $g_gop_size do #echo "use gop_size:"$gop for preset in $g_presets do #echo "use preset:"$preset for profile in $g_profiles do #echo "use profile:"$profile for codec in $g_encode_type do #echo "use codec:"$codec do_one_analysis $codec $rate $gop $preset $profile done done done done done } # globle params g_encode_type="libx264 h264_qsv" g_bit_rate="1000k 1500k 2000k 2500k" g_gop_size="25 50 100" g_presets="veryfast medium veryslow" g_profiles="baseline main high" # the source yuv path src_yuv="/home/haoshengyin_420_deinterlace.yuv" src_width=1920 src_height=1080 dst_dir="/home/test" ffmpeg_path="/home/ffmpeg" analysis_bin="/home/psnr" # to analysis Analysis