Not sure how FATE works but I suppose the pseudo-random becomes deterministic ?
In that case the size should always be the same. And if not having a fixed size
will make no difference.
If FATE can skip random parts of a file (which your patch would solve) it will
miss inconsitencies of UIDs that should be the same in two places of the file.
So IMO it's not good. I suggest to have a flag in the muxer to force the seed
to a fixed value when using FATE.
> On April 5, 2020 5:59 PM Andreas Rheinhardt <andreas.rheinha...@gmail.com>
> wrote:
>
>
> Using random values for TrackUID and FileUID (as happens when the
> AVFMT_FLAG_BITEXACT flag is not set) has the obvious downside of making
> the output indeterministic. This commit mitigates this by writing the
> potentially random values with a fixed size of eight byte, even if their
> actual values would fit into less than eight bytes. This ensures that
> even in non-bitexact mode, the differences between two files generated
> with the same settings are restricted to a few bytes in the header.
> (Namely the SegmentUID, the TrackUIDs (in Tracks as well as when
> referencing them via TagTrackUID), the FileUIDs (in Attachments as
> well as in TagAttachmentUID) as well as the CRC-32 checksums of the
> Info, Tracks, Attachments and Tags level-1-elements.) Without this
> patch, there might be an offset/a size difference between two such
> files.
>
> The FATE-tests had to be updated because the fixed-sized UIDs are also
> used in bitexact mode.
>
> Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@gmail.com>
> ---
> libavformat/matroskaenc.c | 16 +++++--
> tests/fate/matroska.mak | 2 +-
> tests/fate/wavpack.mak | 4 +-
> tests/ref/fate/aac-autobsf-adtstoasc | 4 +-
> tests/ref/fate/binsub-mksenc | 2 +-
> tests/ref/fate/matroska-flac-extradata-update | 4 +-
> tests/ref/fate/rgb24-mkv | 4 +-
> tests/ref/lavf-fate/av1.mkv | 4 +-
> tests/ref/lavf/mka | 4 +-
> tests/ref/lavf/mkv | 4 +-
> tests/ref/lavf/mkv_attachment | 4 +-
> tests/ref/seek/lavf-mkv | 44 +++++++++----------
> 12 files changed, 53 insertions(+), 43 deletions(-)
>
> diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
> index 135d5e3abd..cf2bb7b933 100644
> --- a/libavformat/matroskaenc.c
> +++ b/libavformat/matroskaenc.c
> @@ -226,6 +226,16 @@ static void put_ebml_num(AVIOContext *pb, uint64_t num,
> int bytes)
> avio_w8(pb, (uint8_t)(num >> i * 8));
> }
>
> +/**
> + * Write a (random) UID with fixed size to make the output more deterministic
> + */
> +static void put_ebml_uid(AVIOContext *pb, uint32_t elementid, uint64_t uid)
> +{
> + put_ebml_id(pb, elementid);
> + put_ebml_num(pb, 8, 0);
> + avio_wb64(pb, uid);
> +}
> +
> static void put_ebml_uint(AVIOContext *pb, uint32_t elementid, uint64_t val)
> {
> int i, bytes = 1;
> @@ -1104,7 +1114,7 @@ static int mkv_write_track(AVFormatContext *s,
> MatroskaMuxContext *mkv,
> track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
> put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
> mkv->is_dash ? mkv->dash_track_number : i + 1);
> - put_ebml_uint (pb, MATROSKA_ID_TRACKUID, mkv->tracks[i].uid);
> + put_ebml_uid (pb, MATROSKA_ID_TRACKUID, mkv->tracks[i].uid);
> put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing
> (yet)
>
> if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
> @@ -1485,7 +1495,7 @@ static int mkv_write_tag_targets(AVFormatContext *s,
> uint32_t elementid,
> *tag = start_ebml_master(pb, MATROSKA_ID_TAG, 0);
> targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 0);
> if (elementid)
> - put_ebml_uint(pb, elementid, uid);
> + put_ebml_uid(pb, elementid, uid);
> end_ebml_master(pb, targets);
> return 0;
> }
> @@ -1684,7 +1694,7 @@ static int mkv_write_attachments(AVFormatContext *s)
>
> put_ebml_string(dyn_cp, MATROSKA_ID_FILEMIMETYPE, mimetype);
> put_ebml_binary(dyn_cp, MATROSKA_ID_FILEDATA,
> st->codecpar->extradata, st->codecpar->extradata_size);
> - put_ebml_uint(dyn_cp, MATROSKA_ID_FILEUID, track->uid);
> + put_ebml_uid(dyn_cp, MATROSKA_ID_FILEUID, track->uid);
> end_ebml_master(dyn_cp, attached_file);
> }
> end_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_ATTACHMENTS, 0, 0);
> diff --git a/tests/fate/matroska.mak b/tests/fate/matroska.mak
> index 4b9ee7a872..8cc35d52da 100644
> --- a/tests/fate/matroska.mak
> +++ b/tests/fate/matroska.mak
> @@ -12,7 +12,7 @@ fate-matroska-prores-header-insertion-bz2: CMD = framecrc
> -i $(TARGET_SAMPLES)/m
> FATE_MATROSKA-$(call DEMMUX, MATROSKA, MATROSKA) += fate-matroska-remux
> fate-matroska-remux: CMD = md5pipe -i
> $(TARGET_SAMPLES)/vp9-test-vectors/vp90-2-2pass-akiyo.webm -color_trc 4 -c:v
> copy -fflags +bitexact -strict -2 -f matroska
> fate-matroska-remux: CMP = oneline
> -fate-matroska-remux: REF = 49a60ef91cf7302ab7276f9373f8a429
> +fate-matroska-remux: REF = 8369f24de64aaa52cf57a699dcdc7d58
>
> FATE_MATROSKA-$(call ALLYES, MATROSKA_DEMUXER VORBIS_PARSER) +=
> fate-matroska-xiph-lacing
> fate-matroska-xiph-lacing: CMD = framecrc -i
> $(TARGET_SAMPLES)/mkv/xiph_lacing.mka -c:a copy
> diff --git a/tests/fate/wavpack.mak b/tests/fate/wavpack.mak
> index bc7a5cc92f..e3cf4ec632 100644
> --- a/tests/fate/wavpack.mak
> +++ b/tests/fate/wavpack.mak
> @@ -91,12 +91,12 @@ fate-wavpack-matroskamode: CMD = md5 -i
> $(TARGET_SAMPLES)/wavpack/special/matros
> FATE_WAVPACK-$(call DEMMUX, WV, MATROSKA) += fate-wavpack-matroska_mux-mono
> fate-wavpack-matroska_mux-mono: CMD = md5pipe -i
> $(TARGET_SAMPLES)/wavpack/num_channels/mono_16bit_int.wv -c copy -fflags
> +bitexact -f matroska
> fate-wavpack-matroska_mux-mono: CMP = oneline
> -fate-wavpack-matroska_mux-mono: REF = a9da0444604848080b08e32de19f42d9
> +fate-wavpack-matroska_mux-mono: REF = 7ebd447336f0ba76b41a3f32d1551f05
>
> FATE_WAVPACK-$(call DEMMUX, WV, MATROSKA) += fate-wavpack-matroska_mux-61
> fate-wavpack-matroska_mux-61: CMD = md5pipe -i
> $(TARGET_SAMPLES)/wavpack/num_channels/eva_2.22_6.1_16bit-partial.wv -c copy
> -fflags +bitexact -f matroska
> fate-wavpack-matroska_mux-61: CMP = oneline
> -fate-wavpack-matroska_mux-61: REF = 60812e377937456863a3c899ee068060
> +fate-wavpack-matroska_mux-61: REF = c95bca3c3023230a324c633942c453d5
>
> FATE_SAMPLES_AVCONV += $(FATE_WAVPACK-yes)
> fate-wavpack: $(FATE_WAVPACK-yes)
> diff --git a/tests/ref/fate/aac-autobsf-adtstoasc
> b/tests/ref/fate/aac-autobsf-adtstoasc
> index 45b68b62bd..f1c6f889d4 100644
> --- a/tests/ref/fate/aac-autobsf-adtstoasc
> +++ b/tests/ref/fate/aac-autobsf-adtstoasc
> @@ -1,5 +1,5 @@
> -d10b73732b32f6b2f08885b40c41c77f
> *tests/data/fate/aac-autobsf-adtstoasc.matroska
> -6606 tests/data/fate/aac-autobsf-adtstoasc.matroska
> +9d0c81ce285a84c0137316004d091d95
> *tests/data/fate/aac-autobsf-adtstoasc.matroska
> +6620 tests/data/fate/aac-autobsf-adtstoasc.matroska
> #extradata 0: 2, 0x0030001c
> #tb 0: 1/1000
> #media_type 0: audio
> diff --git a/tests/ref/fate/binsub-mksenc b/tests/ref/fate/binsub-mksenc
> index 3266501de6..b4c08e57dd 100644
> --- a/tests/ref/fate/binsub-mksenc
> +++ b/tests/ref/fate/binsub-mksenc
> @@ -1 +1 @@
> -03d376cc2e8622e7af540d4d9809dbf7
> +3dd15fa67a1df541aa89565ceb7047cf
> diff --git a/tests/ref/fate/matroska-flac-extradata-update
> b/tests/ref/fate/matroska-flac-extradata-update
> index f274e1a75d..dfb2851b0f 100644
> --- a/tests/ref/fate/matroska-flac-extradata-update
> +++ b/tests/ref/fate/matroska-flac-extradata-update
> @@ -1,5 +1,5 @@
> -5070c157123b54e218c7e0a45d5606c8
> *tests/data/fate/matroska-flac-extradata-update.matroska
> -1977 tests/data/fate/matroska-flac-extradata-update.matroska
> +83aca2772c52f6f802cac288f889382b
> *tests/data/fate/matroska-flac-extradata-update.matroska
> +2019 tests/data/fate/matroska-flac-extradata-update.matroska
> #extradata 0: 34, 0x7acb09e7
> #extradata 1: 34, 0x7acb09e7
> #extradata 2: 34, 0x443402dd
> diff --git a/tests/ref/fate/rgb24-mkv b/tests/ref/fate/rgb24-mkv
> index 686c45ebfb..fc73604ebc 100644
> --- a/tests/ref/fate/rgb24-mkv
> +++ b/tests/ref/fate/rgb24-mkv
> @@ -1,5 +1,5 @@
> -f9feab2a7ed8f1049df1b70982291505 *tests/data/fate/rgb24-mkv.matroska
> -58192 tests/data/fate/rgb24-mkv.matroska
> +661b2d8ad9b7c5bf7389d3408c3695c4 *tests/data/fate/rgb24-mkv.matroska
> +58206 tests/data/fate/rgb24-mkv.matroska
> #tb 0: 1/10
> #media_type 0: video
> #codec_id 0: rawvideo
> diff --git a/tests/ref/lavf-fate/av1.mkv b/tests/ref/lavf-fate/av1.mkv
> index bd8ae6eefa..28a8c890c7 100644
> --- a/tests/ref/lavf-fate/av1.mkv
> +++ b/tests/ref/lavf-fate/av1.mkv
> @@ -1,3 +1,3 @@
> -be4903a6a6710043383c8f38a535a8d3 *tests/data/lavf-fate/lavf.av1.mkv
> -55636 tests/data/lavf-fate/lavf.av1.mkv
> +339f457b665fb5e8652fd50f2d3c4823 *tests/data/lavf-fate/lavf.av1.mkv
> +55650 tests/data/lavf-fate/lavf.av1.mkv
> tests/data/lavf-fate/lavf.av1.mkv CRC=0x7c27cc15
> diff --git a/tests/ref/lavf/mka b/tests/ref/lavf/mka
> index f212097bac..b3c4117d92 100644
> --- a/tests/ref/lavf/mka
> +++ b/tests/ref/lavf/mka
> @@ -1,3 +1,3 @@
> -9bd06ae5291de75c19a60c3f39db4c09 *tests/data/lavf/lavf.mka
> -43538 tests/data/lavf/lavf.mka
> +0d48d93057f14704f6b839bb15e7328a *tests/data/lavf/lavf.mka
> +43552 tests/data/lavf/lavf.mka
> tests/data/lavf/lavf.mka CRC=0x3a1da17e
> diff --git a/tests/ref/lavf/mkv b/tests/ref/lavf/mkv
> index 04b554bb56..014ea06003 100644
> --- a/tests/ref/lavf/mkv
> +++ b/tests/ref/lavf/mkv
> @@ -1,3 +1,3 @@
> -85ef0666b3ad642221793b1c4f985011 *tests/data/lavf/lavf.mkv
> -320418 tests/data/lavf/lavf.mkv
> +06c38b55305367672a7fc4efb71947bc *tests/data/lavf/lavf.mkv
> +320446 tests/data/lavf/lavf.mkv
> tests/data/lavf/lavf.mkv CRC=0xec6c3c68
> diff --git a/tests/ref/lavf/mkv_attachment b/tests/ref/lavf/mkv_attachment
> index 08c9c1ebdb..f297d407c8 100644
> --- a/tests/ref/lavf/mkv_attachment
> +++ b/tests/ref/lavf/mkv_attachment
> @@ -1,3 +1,3 @@
> -6f68dccaaaf875a0671f47e5b21c8cca *tests/data/lavf/lavf.mkv_attachment
> -472566 tests/data/lavf/lavf.mkv_attachment
> +cf27537eabb1f4f222e7391aa4f5250d *tests/data/lavf/lavf.mkv_attachment
> +472601 tests/data/lavf/lavf.mkv_attachment
> tests/data/lavf/lavf.mkv_attachment CRC=0xec6c3c68
> diff --git a/tests/ref/seek/lavf-mkv b/tests/ref/seek/lavf-mkv
> index a3dce35d86..e9f1e521f2 100644
> --- a/tests/ref/seek/lavf-mkv
> +++ b/tests/ref/seek/lavf-mkv
> @@ -1,48 +1,48 @@
> -ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 666 size:
> 208
> +ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 694 size:
> 208
> ret: 0 st:-1 flags:0 ts:-1.000000
> -ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size:
> 27837
> +ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size:
> 27837
> ret: 0 st:-1 flags:1 ts: 1.894167
> -ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292298 size:
> 27834
> +ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size:
> 27834
> ret: 0 st: 0 flags:0 ts: 0.788000
> -ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292298 size:
> 27834
> +ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size:
> 27834
> ret: 0 st: 0 flags:1 ts:-0.317000
> -ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size:
> 27837
> +ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size:
> 27837
> ret:-1 st: 1 flags:0 ts: 2.577000
> ret: 0 st: 1 flags:1 ts: 1.471000
> -ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320139 size:
> 209
> +ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320167 size:
> 209
> ret: 0 st:-1 flags:0 ts: 0.365002
> -ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146850 size:
> 27925
> +ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146878 size:
> 27925
> ret: 0 st:-1 flags:1 ts:-0.740831
> -ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size:
> 27837
> +ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size:
> 27837
> ret:-1 st: 0 flags:0 ts: 2.153000
> ret: 0 st: 0 flags:1 ts: 1.048000
> -ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292298 size:
> 27834
> +ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size:
> 27834
> ret: 0 st: 1 flags:0 ts:-0.058000
> -ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 666 size:
> 208
> +ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 694 size:
> 208
> ret: 0 st: 1 flags:1 ts: 2.836000
> -ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320139 size:
> 209
> +ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320167 size:
> 209
> ret:-1 st:-1 flags:0 ts: 1.730004
> ret: 0 st:-1 flags:1 ts: 0.624171
> -ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146850 size:
> 27925
> +ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146878 size:
> 27925
> ret: 0 st: 0 flags:0 ts:-0.482000
> -ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size:
> 27837
> +ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size:
> 27837
> ret: 0 st: 0 flags:1 ts: 2.413000
> -ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292298 size:
> 27834
> +ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size:
> 27834
> ret:-1 st: 1 flags:0 ts: 1.307000
> ret: 0 st: 1 flags:1 ts: 0.201000
> -ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 666 size:
> 208
> +ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 694 size:
> 208
> ret: 0 st:-1 flags:0 ts:-0.904994
> -ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size:
> 27837
> +ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size:
> 27837
> ret: 0 st:-1 flags:1 ts: 1.989173
> -ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292298 size:
> 27834
> +ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size:
> 27834
> ret: 0 st: 0 flags:0 ts: 0.883000
> -ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292298 size:
> 27834
> +ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size:
> 27834
> ret: 0 st: 0 flags:1 ts:-0.222000
> -ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size:
> 27837
> +ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size:
> 27837
> ret:-1 st: 1 flags:0 ts: 2.672000
> ret: 0 st: 1 flags:1 ts: 1.566000
> -ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320139 size:
> 209
> +ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320167 size:
> 209
> ret: 0 st:-1 flags:0 ts: 0.460008
> -ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146850 size:
> 27925
> +ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146878 size:
> 27925
> ret: 0 st:-1 flags:1 ts:-0.645825
> -ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size:
> 27837
> +ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size:
> 27837
> --
> 2.20.1
>
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