Hi,
recently when testing I stumbled over the situation that a specific
10-bit YUV input file was encoded separately using two different
loss-less encoders V210 and FFV1. When comparing the FrameMD5 checksum
of both output files most of the checksums did match, but some of them
where different (approx. 3% of the frames).
When trying to reproduce the scenario with the attached batch script
using a video source filter the resulting files even differ in every
frame. My assumption would have been that the FrameMD5 checksums of both
files would be the same, as they originate from the same input file and
the intermediate encoding should be loss-less.
Can someone give a hint where the differences come from? Is there some
command-line option for bit-exactness missing, or is there something
going wrong in the decoder/encoders?
Regards,
Tobias
ffmpeg version N-109026-ge17628b Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
configuration: --disable-network --enable-libsoxr --enable-libtwolame
--enable-libmp3lame --enable-libvorbis --enable-libfreetype --enable-static
--disable-shared --prefix=/usr/local
libavutil 57. 42.100 / 57. 42.100
libavcodec 59. 52.100 / 59. 52.100
libavformat 59. 34.101 / 59. 34.101
libavdevice 59. 8.101 / 59. 8.101
libavfilter 8. 50.100 / 8. 50.100
libswscale 6. 8.112 / 6. 8.112
libswresample 4. 9.100 / 4. 9.100
Stream mapping:
format:default -> Stream #0:0 (ffvhuff)
Press [q] to stop, [?] for help
Output #0, avi, to './temp/ffmpeg-10bit-test-input.avi':
Metadata:
ISFT : Lavf59.34.101
Stream #0:0: Video: ffvhuff (FFVH / 0x48564646), yuv422p10le(tv,
progressive), 720x576 [SAR 1:1 DAR 5:4], q=2-31, 200 kb/s, 25 fps, 25 tbn
Metadata:
encoder : Lavc59.52.100 ffvhuff
frame= 0 fps=0.0 q=0.0 size= 0kB time=-577014:32:22.77 bitrate=
-0.0kbits/s speed=N/A
frame= 25 fps=0.0 q=-0.0 Lsize= 6869kB time=00:00:00.96
bitrate=58617.6kbits/s speed=9.06x
video:6863kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 0.092806%
ffmpeg version N-109026-ge17628b Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
configuration: --disable-network --enable-libsoxr --enable-libtwolame
--enable-libmp3lame --enable-libvorbis --enable-libfreetype --enable-static
--disable-shared --prefix=/usr/local
libavutil 57. 42.100 / 57. 42.100
libavcodec 59. 52.100 / 59. 52.100
libavformat 59. 34.101 / 59. 34.101
libavdevice 59. 8.101 / 59. 8.101
libavfilter 8. 50.100 / 8. 50.100
libswscale 6. 8.112 / 6. 8.112
libswresample 4. 9.100 / 4. 9.100
Input #0, avi, from './temp/ffmpeg-10bit-test-input.avi':
Metadata:
software : Lavf59.34.101
Duration: 00:00:01.00, start: 0.000000, bitrate: 56272 kb/s
Stream #0:0: Video: ffvhuff (FFVH / 0x48564646), yuv422p10le, 720x576, 58563
kb/s, SAR 1:1 DAR 5:4, 25 fps, 25 tbr, 25 tbn
Stream mapping:
Stream #0:0 -> #0:0 (ffvhuff (native) -> v210 (native))
Press [q] to stop, [?] for help
Output #0, avi, to './temp/ffmpeg-10bit-test-output01.avi':
Metadata:
software : Lavf59.34.101
Stream #0:0: Video: v210 (v210 / 0x30313276), yuv422p10le(progressive),
720x576 [SAR 1:1 DAR 5:4], q=2-31, 221184 kb/s, 25 fps, 25 tbn
Metadata:
encoder : Lavc v210
frame= 0 fps=0.0 q=-0.0 size= 0kB time=00:00:00.00 bitrate=N/A
speed=N/A
frame= 25 fps=0.0 q=-0.0 Lsize= 27006kB time=00:00:00.96
bitrate=230452.7kbits/s speed=6.92x
video:27000kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.022888%
ffmpeg version N-109026-ge17628b Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
configuration: --disable-network --enable-libsoxr --enable-libtwolame
--enable-libmp3lame --enable-libvorbis --enable-libfreetype --enable-static
--disable-shared --prefix=/usr/local
libavutil 57. 42.100 / 57. 42.100
libavcodec 59. 52.100 / 59. 52.100
libavformat 59. 34.101 / 59. 34.101
libavdevice 59. 8.101 / 59. 8.101
libavfilter 8. 50.100 / 8. 50.100
libswscale 6. 8.112 / 6. 8.112
libswresample 4. 9.100 / 4. 9.100
Input #0, avi, from './temp/ffmpeg-10bit-test-input.avi':
Metadata:
software : Lavf59.34.101
Duration: 00:00:01.00, start: 0.000000, bitrate: 56272 kb/s
Stream #0:0: Video: ffvhuff (FFVH / 0x48564646), yuv422p10le, 720x576, 58563
kb/s, SAR 1:1 DAR 5:4, 25 fps, 25 tbr, 25 tbn
Stream mapping:
Stream #0:0 -> #0:0 (ffvhuff (native) -> ffv1 (native))
Press [q] to stop, [?] for help
[ffv1 @ 0x229a9c0] bits_per_raw_sample > 8, forcing range coder
Output #0, avi, to './temp/ffmpeg-10bit-test-output02.avi':
Metadata:
software : Lavf59.34.101
Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv422p10le(progressive),
720x576 [SAR 1:1 DAR 5:4], q=2-31, 200 kb/s, 25 fps, 25 tbn
Metadata:
encoder : Lavc ffv1
frame= 0 fps=0.0 q=-0.0 size= 0kB time=00:00:00.00 bitrate=N/A
speed=N/A
frame= 25 fps=0.0 q=-0.0 Lsize= 231kB time=00:00:00.96
bitrate=1969.5kbits/s speed=4.12x
video:224kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 2.845928%
ffmpeg version N-109026-ge17628b Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
configuration: --disable-network --enable-libsoxr --enable-libtwolame
--enable-libmp3lame --enable-libvorbis --enable-libfreetype --enable-static
--disable-shared --prefix=/usr/local
libavutil 57. 42.100 / 57. 42.100
libavcodec 59. 52.100 / 59. 52.100
libavformat 59. 34.101 / 59. 34.101
libavdevice 59. 8.101 / 59. 8.101
libavfilter 8. 50.100 / 8. 50.100
libswscale 6. 8.112 / 6. 8.112
libswresample 4. 9.100 / 4. 9.100
Input #0, avi, from './temp/ffmpeg-10bit-test-output01.avi':
Duration: 00:00:01.00, start: 0.000000, bitrate: 221234 kb/s
Stream #0:0: Video: v210 (v210 / 0x30313276), yuv422p10le, 720x576, 230400
kb/s, SAR 1:1 DAR 5:4, 25 fps, 25 tbr, 25 tbn
Stream mapping:
Stream #0:0 -> #0:0 (v210 (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, framemd5, to './temp/ffmpeg-10bit-test-output01.avi.framemd5':
Stream #0:0: Video: rawvideo (Y3[10][10] / 0xA0A3359),
yuv422p10le(progressive), 720x576 [SAR 1:1 DAR 5:4], q=2-31, 207360 kb/s, 25
fps, 25 tbn
Metadata:
encoder : Lavc rawvideo
frame= 0 fps=0.0 q=-0.0 size= 0kB time=00:00:00.00 bitrate=N/A
speed=N/A
frame= 25 fps=0.0 q=-0.0 Lsize= 2kB time=00:00:00.96 bitrate=
18.2kbits/s speed=17.4x
video:40500kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
ffmpeg version N-109026-ge17628b Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
configuration: --disable-network --enable-libsoxr --enable-libtwolame
--enable-libmp3lame --enable-libvorbis --enable-libfreetype --enable-static
--disable-shared --prefix=/usr/local
libavutil 57. 42.100 / 57. 42.100
libavcodec 59. 52.100 / 59. 52.100
libavformat 59. 34.101 / 59. 34.101
libavdevice 59. 8.101 / 59. 8.101
libavfilter 8. 50.100 / 8. 50.100
libswscale 6. 8.112 / 6. 8.112
libswresample 4. 9.100 / 4. 9.100
Input #0, avi, from './temp/ffmpeg-10bit-test-output02.avi':
Duration: 00:00:01.00, start: 0.000000, bitrate: 1890 kb/s
Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv422p10le, 720x576, 1915
kb/s, SAR 1:1 DAR 5:4, 25 fps, 25 tbr, 25 tbn
Stream mapping:
Stream #0:0 -> #0:0 (ffv1 (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, framemd5, to './temp/ffmpeg-10bit-test-output02.avi.framemd5':
Stream #0:0: Video: rawvideo (Y3[10][10] / 0xA0A3359),
yuv422p10le(progressive), 720x576 [SAR 1:1 DAR 5:4], q=2-31, 207360 kb/s, 25
fps, 25 tbn
Metadata:
encoder : Lavc rawvideo
frame= 0 fps=0.0 q=-0.0 size= 0kB time=00:00:00.00 bitrate=N/A
speed=N/A
frame= 25 fps=0.0 q=-0.0 Lsize= 2kB time=00:00:00.96 bitrate=
18.2kbits/s speed=7.19x
video:40500kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
Files ./temp/ffmpeg-10bit-test-output01.avi.framemd5 and
./temp/ffmpeg-10bit-test-output02.avi.framemd5 differ
=== TEST FAILED ===
#!/bin/bash
set -e
# =========================================================================
# Configuration
BASE_PATH="./temp"
INPUT_FILE="$BASE_PATH/ffmpeg-10bit-test-input.avi"
OUTPUT_FILE01="$BASE_PATH/ffmpeg-10bit-test-output01.avi"
OUTPUT_FILE02="$BASE_PATH/ffmpeg-10bit-test-output02.avi"
FFMPEG_PATH="."
FFMPEG_BIN="$FFMPEG_PATH/build-linux/ffmpeg"
FFMPEG_BITEXACT_OPTS="-flags +bitexact -sws_flags +accurate_rnd+bitexact
-fflags +bitexact -threads 1"
# =========================================================================
# Create Input File
mkdir -p "$BASE_PATH"
$FFMPEG_BIN \
-lavfi "yuvtestsrc=size=720x576:rate=25,format=yuv422p10le" \
-f avi -vcodec ffvhuff -g 1 \
-t 1.0 -y "$INPUT_FILE"
# =========================================================================
# Create Output Files
$FFMPEG_BIN \
$FFMPEG_BITEXACT_OPTS -i "$INPUT_FILE" \
-f avi -map 0:v -vcodec v210 -g 1 -pix_fmt +yuv422p10le \
$FFMPEG_BITEXACT_OPTS -y "$OUTPUT_FILE01"
$FFMPEG_BIN \
$FFMPEG_BITEXACT_OPTS -i "$INPUT_FILE" \
-f avi -map 0:v -vcodec ffv1 -g 1 -level 3 -pix_fmt +yuv422p10le \
$FFMPEG_BITEXACT_OPTS -y "$OUTPUT_FILE02"
# =========================================================================
# Create Frame-MD5 Files
$FFMPEG_BIN \
$FFMPEG_BITEXACT_OPTS -i "$OUTPUT_FILE01" \
-f framemd5 -map 0:v -map_metadata -1 \
$FFMPEG_BITEXACT_OPTS -y "$OUTPUT_FILE01.framemd5"
$FFMPEG_BIN \
$FFMPEG_BITEXACT_OPTS -i "$OUTPUT_FILE02" \
-f framemd5 -map 0:v -map_metadata -1 \
$FFMPEG_BITEXACT_OPTS -y "$OUTPUT_FILE02.framemd5"
diff -q "$OUTPUT_FILE01.framemd5" "$OUTPUT_FILE02.framemd5" && result=$? ||
result=$?
if [ $result -eq 0 ]; then
echo "=== TEST SUCCEEDED ===";
else
echo "=== TEST FAILED ===";
fi
_______________________________________________
ffmpeg-user mailing list
[email protected]
https://ffmpeg.org/mailman/listinfo/ffmpeg-user
To unsubscribe, visit link above, or email
[email protected] with subject "unsubscribe".
