[FFmpeg-devel] [PATCH] avformat/mov: add support for multiple decryption keys

Adrien Guinet adrien at guinet.me
Mon Nov 13 10:40:19 EET 2023


This commit introduces new options to support more than one decryption
keys:
* add a decryption_keys option to MOV, that supports a dictionnary of
  KID=>key (in hex), using AV_OPT_TYPE_DICT
* add the corresponding cenc_decryption_keys option to DASH
---
 doc/demuxers.texi                          | 12 +++-
 libavformat/dashdec.c                      |  6 +-
 libavformat/isom.h                         |  5 +-
 libavformat/mov.c                          | 80 ++++++++++++++++++----
 tests/fate/mov.mak                         | 12 ++++
 tests/ref/fate/mov-3elist-encrypted-kid    | 57 +++++++++++++++
 tests/ref/fate/mov-frag-encrypted-kid      | 57 +++++++++++++++
 tests/ref/fate/mov-tenc-only-encrypted-kid | 57 +++++++++++++++
 8 files changed, 269 insertions(+), 17 deletions(-)
 create mode 100644 tests/ref/fate/mov-3elist-encrypted-kid
 create mode 100644 tests/ref/fate/mov-frag-encrypted-kid
 create mode 100644 tests/ref/fate/mov-tenc-only-encrypted-kid

diff --git a/doc/demuxers.texi b/doc/demuxers.texi
index ca1563abb0..9d0ab6025c 100644
--- a/doc/demuxers.texi
+++ b/doc/demuxers.texi
@@ -281,7 +281,11 @@ This demuxer accepts the following option:
 @table @option
 
 @item cenc_decryption_key
-16-byte key, in hex, to decrypt files encrypted using ISO Common Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
+Default 16-byte key, in hex, to decrypt files encrypted using ISO Common Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
+
+ at item cenc_decryption_keys
+Dictionary of 16-byte key ID => 16-byte key, both in hex, to decrypt files encrypted using ISO Common Encryption
+(CENC/AES-128 CTR; ISO/IEC 23001-7).
 
 @end table
 
@@ -769,7 +773,11 @@ Fixed key used for handling Audible AAX/AAX+ files. It has been pre-set so shoul
 specify.
 
 @item decryption_key
-16-byte key, in hex, to decrypt files encrypted using ISO Common Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
+Default 16-byte key, in hex, to decrypt files encrypted using ISO Common Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
+
+ at item decryption_keys
+Dictionary of 16-byte key ID => 16-byte key, both in hex, to decrypt files encrypted using ISO Common Encryption
+(CENC/AES-128 CTR; ISO/IEC 23001-7).
 
 @item max_stts_delta
 Very high sample deltas written in a trak's stts box may occasionally be intended but usually they are written in
diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
index 1215407f3c..091deac854 100644
--- a/libavformat/dashdec.c
+++ b/libavformat/dashdec.c
@@ -153,6 +153,7 @@ typedef struct DASHContext {
     AVDictionary *avio_opts;
     int max_url_size;
     char *cenc_decryption_key;
+    char *cenc_decryption_keys;
 
     /* Flags for init section*/
     int is_init_section_common_video;
@@ -1903,6 +1904,8 @@ static int reopen_demux_for_component(AVFormatContext *s, struct representation
 
     if (c->cenc_decryption_key)
         av_dict_set(&in_fmt_opts, "decryption_key", c->cenc_decryption_key, 0);
+    if (c->cenc_decryption_keys)
+        av_dict_set(&in_fmt_opts, "decryption_keys", c->cenc_decryption_keys, 0);
 
     // provide additional information from mpd if available
     ret = avformat_open_input(&pls->ctx, "", in_fmt, &in_fmt_opts); //pls->init_section->url
@@ -2344,7 +2347,8 @@ static const AVOption dash_options[] = {
         OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
         {.str = "aac,m4a,m4s,m4v,mov,mp4,webm,ts"},
         INT_MIN, INT_MAX, FLAGS},
-    { "cenc_decryption_key", "Media decryption key (hex)", OFFSET(cenc_decryption_key), AV_OPT_TYPE_STRING, {.str = NULL}, INT_MIN, INT_MAX, .flags = FLAGS },
+    { "cenc_decryption_key", "Media default decryption key (hex)", OFFSET(cenc_decryption_key), AV_OPT_TYPE_STRING, {.str = NULL}, INT_MIN, INT_MAX, .flags = FLAGS },
+    { "cenc_decryption_keys", "Media decryption keys by KID (hex)", OFFSET(cenc_decryption_keys), AV_OPT_TYPE_STRING, {.str = NULL}, INT_MIN, INT_MAX, .flags = FLAGS },
     {NULL}
 };
 
diff --git a/libavformat/isom.h b/libavformat/isom.h
index 3d375d7a46..83bacb96a1 100644
--- a/libavformat/isom.h
+++ b/libavformat/isom.h
@@ -312,8 +312,8 @@ typedef struct MOVContext {
     void *audible_iv;
     int audible_iv_size;
     struct AVAES *aes_decrypt;
-    uint8_t *decryption_key;
-    int decryption_key_len;
+    uint8_t *decryption_default_key;
+    int decryption_default_key_len;
     int enable_drefs;
     int32_t movie_display_matrix[3][3]; ///< display matrix from mvhd
     int have_read_mfra_size;
@@ -328,6 +328,7 @@ typedef struct MOVContext {
     } *avif_info;
     int avif_info_size;
     int interleaved_read;
+    AVDictionary* decryption_keys;
 } MOVContext;
 
 int ff_mp4_read_descr_len(AVIOContext *pb);
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 34ca8095c2..550bce86f5 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -7118,19 +7118,62 @@ static int mov_read_dfla(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     return 0;
 }
 
+static int get_key_from_kid(uint8_t* out, int len, MOVContext *c, AVEncryptionInfo *sample) {
+    AVDictionaryEntry *key_entry_hex;
+    char kid_hex[16*2+1];
+
+    if (c->decryption_default_key && c->decryption_default_key_len != len) {
+        av_log(c->fc, AV_LOG_ERROR, "invalid default decryption key length: got %d, expected %d\n", c->decryption_default_key_len, len);
+        return -1;
+    }
+
+    if (!c->decryption_keys) {
+        av_assert0(c->decryption_default_key);
+        memcpy(out, c->decryption_default_key, len);
+        return 0;
+    }
+
+    if (sample->key_id_size != 16) {
+        av_log(c->fc, AV_LOG_ERROR, "invalid key ID size: got %u, expected 16\n", sample->key_id_size);
+        return -1;
+    }
+
+    ff_data_to_hex(kid_hex, sample->key_id, 16, 1);
+    key_entry_hex = av_dict_get(c->decryption_keys, kid_hex, NULL, AV_DICT_DONT_STRDUP_KEY|AV_DICT_DONT_STRDUP_VAL);
+    if (!key_entry_hex) {
+        if (!c->decryption_default_key) {
+            av_log(c->fc, AV_LOG_ERROR, "unable to find KID %s\n", kid_hex);
+            return -1;
+        }
+        memcpy(out, c->decryption_default_key, len);
+        return 0;
+    }
+    if (strlen(key_entry_hex->value) != len*2) {
+        return -1;
+    }
+    ff_hex_to_data(out, key_entry_hex->value);
+    return 0;
+}
+
 static int cenc_scheme_decrypt(MOVContext *c, MOVStreamContext *sc, AVEncryptionInfo *sample, uint8_t *input, int size)
 {
     int i, ret;
     int bytes_of_protected_data;
+    uint8_t decryption_key[AES_CTR_KEY_SIZE];
 
     if (!sc->cenc.aes_ctr) {
+        ret = get_key_from_kid(decryption_key, sizeof(decryption_key), c, sample);
+        if (ret < 0) {
+            return ret;
+        }
+
         /* initialize the cipher */
         sc->cenc.aes_ctr = av_aes_ctr_alloc();
         if (!sc->cenc.aes_ctr) {
             return AVERROR(ENOMEM);
         }
 
-        ret = av_aes_ctr_init(sc->cenc.aes_ctr, c->decryption_key);
+        ret = av_aes_ctr_init(sc->cenc.aes_ctr, decryption_key);
         if (ret < 0) {
             return ret;
         }
@@ -7176,15 +7219,21 @@ static int cbc1_scheme_decrypt(MOVContext *c, MOVStreamContext *sc, AVEncryption
     int i, ret;
     int num_of_encrypted_blocks;
     uint8_t iv[16];
+    uint8_t decryption_key[16];
 
     if (!sc->cenc.aes_ctx) {
+        ret = get_key_from_kid(decryption_key, sizeof(decryption_key), c, sample);
+        if (ret < 0) {
+            return ret;
+        }
+
         /* initialize the cipher */
         sc->cenc.aes_ctx = av_aes_alloc();
         if (!sc->cenc.aes_ctx) {
             return AVERROR(ENOMEM);
         }
 
-        ret = av_aes_init(sc->cenc.aes_ctx, c->decryption_key, 16 * 8, 1);
+        ret = av_aes_init(sc->cenc.aes_ctx, decryption_key, 16 * 8, 1);
         if (ret < 0) {
             return ret;
         }
@@ -7235,15 +7284,21 @@ static int cens_scheme_decrypt(MOVContext *c, MOVStreamContext *sc, AVEncryption
 {
     int i, ret, rem_bytes;
     uint8_t *data;
+    uint8_t decryption_key[AES_CTR_KEY_SIZE];
 
     if (!sc->cenc.aes_ctr) {
+        ret = get_key_from_kid(decryption_key, sizeof(decryption_key), c, sample);
+        if (ret < 0) {
+            return ret;
+        }
+
         /* initialize the cipher */
         sc->cenc.aes_ctr = av_aes_ctr_alloc();
         if (!sc->cenc.aes_ctr) {
             return AVERROR(ENOMEM);
         }
 
-        ret = av_aes_ctr_init(sc->cenc.aes_ctr, c->decryption_key);
+        ret = av_aes_ctr_init(sc->cenc.aes_ctr, decryption_key);
         if (ret < 0) {
             return ret;
         }
@@ -7301,15 +7356,21 @@ static int cbcs_scheme_decrypt(MOVContext *c, MOVStreamContext *sc, AVEncryption
     int i, ret, rem_bytes;
     uint8_t iv[16];
     uint8_t *data;
+    uint8_t decryption_key[16];
 
     if (!sc->cenc.aes_ctx) {
+        ret = get_key_from_kid(decryption_key, sizeof(decryption_key), c, sample);
+        if (ret < 0) {
+            return ret;
+        }
+
         /* initialize the cipher */
         sc->cenc.aes_ctx = av_aes_alloc();
         if (!sc->cenc.aes_ctx) {
             return AVERROR(ENOMEM);
         }
 
-        ret = av_aes_init(sc->cenc.aes_ctx, c->decryption_key, 16 * 8, 1);
+        ret = av_aes_init(sc->cenc.aes_ctx, decryption_key, 16 * 8, 1);
         if (ret < 0) {
             return ret;
         }
@@ -7452,7 +7513,7 @@ static int cenc_filter(MOVContext *mov, AVStream* st, MOVStreamContext *sc, AVPa
             return AVERROR_INVALIDDATA;
         }
 
-        if (mov->decryption_key) {
+        if (mov->decryption_keys || mov->decryption_default_key) {
             return cenc_decrypt(mov, sc, encrypted_sample, pkt->data, pkt->size);
         } else {
             size_t size;
@@ -8601,12 +8662,6 @@ static int mov_read_header(AVFormatContext *s)
     MOVAtom atom = { AV_RL32("root") };
     int i;
 
-    if (mov->decryption_key_len != 0 && mov->decryption_key_len != AES_CTR_KEY_SIZE) {
-        av_log(s, AV_LOG_ERROR, "Invalid decryption key len %d expected %d\n",
-            mov->decryption_key_len, AES_CTR_KEY_SIZE);
-        return AVERROR(EINVAL);
-    }
-
     mov->fc = s;
     mov->trak_index = -1;
     /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */
@@ -9305,7 +9360,8 @@ static const AVOption mov_options[] = {
         "Fixed key used for handling Audible AAX files", OFFSET(audible_fixed_key),
         AV_OPT_TYPE_BINARY, {.str="77214d4b196a87cd520045fd20a51d67"},
         .flags = AV_OPT_FLAG_DECODING_PARAM },
-    { "decryption_key", "The media decryption key (hex)", OFFSET(decryption_key), AV_OPT_TYPE_BINARY, .flags = AV_OPT_FLAG_DECODING_PARAM },
+    { "decryption_key", "The default media decryption key (hex)", OFFSET(decryption_default_key), AV_OPT_TYPE_BINARY, .flags = AV_OPT_FLAG_DECODING_PARAM },
+    { "decryption_keys", "The media decryption keys by KID (hex)", OFFSET(decryption_keys), AV_OPT_TYPE_DICT, .flags = AV_OPT_FLAG_DECODING_PARAM },
     { "enable_drefs", "Enable external track support.", OFFSET(enable_drefs), AV_OPT_TYPE_BOOL,
         {.i64 = 0}, 0, 1, FLAGS },
     { "max_stts_delta", "treat offsets above this value as invalid", OFFSET(max_stts_delta), AV_OPT_TYPE_INT, {.i64 = UINT_MAX-48000*10 }, 0, UINT_MAX, .flags = AV_OPT_FLAG_DECODING_PARAM },
diff --git a/tests/fate/mov.mak b/tests/fate/mov.mak
index 6cb493ceab..c420d8ab10 100644
--- a/tests/fate/mov.mak
+++ b/tests/fate/mov.mak
@@ -8,6 +8,9 @@ FATE_MOV = fate-mov-3elist \
            fate-mov-3elist-encrypted \
            fate-mov-frag-encrypted \
            fate-mov-tenc-only-encrypted \
+           fate-mov-3elist-encrypted-kid \
+           fate-mov-frag-encrypted-kid \
+           fate-mov-tenc-only-encrypted-kid \
            fate-mov-invalid-elst-entry-count \
            fate-mov-gpmf-remux \
            fate-mov-440hz-10ms \
@@ -57,6 +60,15 @@ fate-mov-frag-encrypted: CMD = framemd5 -decryption_key 123456789012345678901234
 # Full-sample encryption and constant IV using only tenc atom (no senc/saio/saiz).
 fate-mov-tenc-only-encrypted: CMD = framemd5 -decryption_key 12345678901234567890123456789012 -i $(TARGET_SAMPLES)/mov/mov-tenc-only-encrypted.mp4
 
+# Edit list with encryption, using the decryption_keys option.
+fate-mov-3elist-encrypted-kid: CMD = framemd5 -decryption_keys 12345678901234567890123456789012=12345678901234567890123456789012 -i $(TARGET_SAMPLES)/mov/mov-3elist-encrypted.mov
+
+# Fragmented encryption with senc boxes in movie fragments, using the decryption_keys option.
+fate-mov-frag-encrypted-kid: CMD = framemd5 -decryption_keys abba271e8bcf552bbd2e86a434a9a5d9=12345678901234567890123456789012 -i $(TARGET_SAMPLES)/mov/mov-frag-encrypted.mp4
+
+# Full-sample encryption and constant IV using only tenc atom (no senc/saio/saiz), using the decryption_keys option.
+fate-mov-tenc-only-encrypted-kid: CMD = framemd5 -decryption_keys abba271e8bcf552bbd2e86a434a9a5d9=12345678901234567890123456789012 -i $(TARGET_SAMPLES)/mov/mov-tenc-only-encrypted.mp4
+
 # Makes sure that the CTTS is also modified when we fix avindex in mov.c while parsing edit lists.
 fate-mov-elist-starts-ctts-2ndsample: CMD = framemd5 -i $(TARGET_SAMPLES)/mov/mov-elist-starts-ctts-2ndsample.mov
 
diff --git a/tests/ref/fate/mov-3elist-encrypted-kid b/tests/ref/fate/mov-3elist-encrypted-kid
new file mode 100644
index 0000000000..daf4927e0f
--- /dev/null
+++ b/tests/ref/fate/mov-3elist-encrypted-kid
@@ -0,0 +1,57 @@
+#format: frame checksums
+#version: 2
+#hash: MD5
+#tb 0: 1/24
+#media_type 0: video
+#codec_id 0: rawvideo
+#dimensions 0: 640x480
+#sar 0: 0/1
+#stream#, dts,        pts, duration,     size, hash
+0,          0,          0,        1,   460800, 80fbbdec589e15e6c493b44d243f92a9
+0,          1,          1,        1,   460800, f4b23293bb2ecf69cc3570853d8c56a1
+0,          2,          2,        1,   460800, 0c03ce2c1c6ec405d7455465ecd559a3
+0,          3,          3,        1,   460800, 7921791695537fba2c3c123da4834cb9
+0,          4,          4,        1,   460800, 30c8e2903a561b84d4cbaf95c668d236
+0,          5,          5,        1,   460800, 7ff42e998217c17592ddf6b584f26cef
+0,          6,          6,        1,   460800, 5e402c48bf097db2d31b82bb4194a382
+0,          7,          7,        1,   460800, 824c49e92c8ae6d99a0207b514dd756c
+0,          8,          8,        1,   460800, 24f189216a1d9cf2313b2d6dbe3dbdd3
+0,          9,          9,        1,   460800, 519179a8e74275d26b183374637e003f
+0,         10,         10,        1,   460800, f18331ddcef0adf5b069bfa98baf8db4
+0,         11,         11,        1,   460800, 081f61688690d47dbdddd5384e5d5a70
+0,         12,         12,        1,   460800, 90dbf019b9035433371a8df41a9268b7
+0,         13,         13,        1,   460800, bb5adfb9c66732898b34186eca1667ba
+0,         14,         14,        1,   460800, cc08cfd64f37783ecddaf143f6ad78bc
+0,         15,         15,        1,   460800, b8ae21d024fe4df903d56f4521993c72
+0,         16,         16,        1,   460800, b45a99907f045dcadf0a2befc11555e3
+0,         17,         17,        1,   460800, 603ba935845e65ab6cccbbec88bbf60d
+0,         18,         18,        1,   460800, df80c8d3e6a77258a306903f17995a18
+0,         19,         19,        1,   460800, 4b7e90c0a5fd0e0cd958d47f0afac636
+0,         20,         20,        1,   460800, 9feb6e36182f1745be6387edea240eb6
+0,         21,         21,        1,   460800, 86e6de4bd0a5ff7558f4cf6c1ec3930d
+0,         22,         22,        1,   460800, 726b69df77edbe7b503d4698656d1320
+0,         23,         23,        1,   460800, d282fb7a953ac205b0a43d00c2d60a33
+0,         24,         24,        1,   460800, eece3daa70cc20208dd75d91ac84c8fd
+0,         25,         25,        1,   460800, c86d23e73bcce351fc315fb1f13348da
+0,         26,         26,        1,   460800, 93497b4f7c5ad9d61212239b7c9d2770
+0,         27,         27,        1,   460800, eb217d2c12de67903835a8c58f620488
+0,         28,         28,        1,   460800, d966480867bb54c8cd044f18388ed486
+0,         29,         29,        1,   460800, 3ea6207942b3181fdd8e8aa6cae1062a
+0,         30,         30,        1,   460800, 2620df54aca086ec0fb9527c6e6f5135
+0,         31,         31,        1,   460800, 43bb7320f0bb583188dc965ddbfade90
+0,         32,         32,        1,   460800, 0cddaa04645f804e02f65b0836412113
+0,         33,         33,        1,   460800, 83b2dc95807289d7f4a4632bf18c2e97
+0,         34,         34,        1,   460800, 98134d0e41e6dd12827049ccf33b4669
+0,         35,         35,        1,   460800, 56f55631731fa39c7acbab0afeb2eb1b
+0,         36,         36,        1,   460800, 379c1105be09d836a515dc909455ddf4
+0,         37,         37,        1,   460800, 1df87c47e9d98731faf1c3885b77e5da
+0,         38,         38,        1,   460800, 9a8734bcbfdb4d97e530683b8b556a26
+0,         39,         39,        1,   460800, c7a7990d0cddc5adfbe27da7a42e025e
+0,         40,         40,        1,   460800, 0c81e46011e03be410feaf056207fd55
+0,         41,         41,        1,   460800, ca76e4e63016ff29d8aeeb9cb053bb6c
+0,         42,         42,        1,   460800, cebfbe299c17c1f8fc1e6b189555c3c2
+0,         43,         43,        1,   460800, 4f002c5feca5e75f07089e0df47507dd
+0,         44,         44,        1,   460800, c5fd83fc4a745abee9b3d9a6eec9dd3e
+0,         45,         45,        1,   460800, 57d9bad9b45aa2746de5d8bdc2c24969
+0,         46,         46,        1,   460800, 9831673ad7dec167af4a959f64258949
+0,         47,         47,        1,   460800, 77a1cb208f70f51bcb01e28d8cba73b4
diff --git a/tests/ref/fate/mov-frag-encrypted-kid b/tests/ref/fate/mov-frag-encrypted-kid
new file mode 100644
index 0000000000..e6c109b566
--- /dev/null
+++ b/tests/ref/fate/mov-frag-encrypted-kid
@@ -0,0 +1,57 @@
+#format: frame checksums
+#version: 2
+#hash: MD5
+#tb 0: 1/24
+#media_type 0: video
+#codec_id 0: rawvideo
+#dimensions 0: 120x52
+#sar 0: 544/545
+#stream#, dts,        pts, duration,     size, hash
+0,          0,          0,        1,     9360, 920bdc277a6a31c1daed9aca44b10caf
+0,          1,          1,        1,     9360, f1c0b61fef593de57cb97be7fa846569
+0,          2,          2,        1,     9360, 6ef32d9d4398355aebf6d3fb11d51d3f
+0,          3,          3,        1,     9360, d38fd3ef1e5a92fc109b8dd9eb6dadeb
+0,          4,          4,        1,     9360, 54cc0c8a25d2f14f32663837d5e646f1
+0,          5,          5,        1,     9360, b4b6829726dc3decb8b80ba0c35bcf30
+0,          6,          6,        1,     9360, fca3f941e60a2f0a4ce30d5e0efbec3c
+0,          7,          7,        1,     9360, cda6e26b6c1039ff3d229b262c9210c3
+0,          8,          8,        1,     9360, f0d69255e3a27a8b4ae8a4b7b210929d
+0,          9,          9,        1,     9360, 12cb23dd4e32af9c3b35f943714e3fdd
+0,         10,         10,        1,     9360, 082aaf3216124ddcecb422fe5c832e82
+0,         11,         11,        1,     9360, ff37bb8cd6bd0412a3b3cb45db54afc9
+0,         12,         12,        1,     9360, dfb9085441575732844b6c2f05d5f542
+0,         13,         13,        1,     9360, 0017100feaaa9fc7eacd2447d50d7542
+0,         14,         14,        1,     9360, 4e2f1b8c4e04c59934c2f58541e62613
+0,         15,         15,        1,     9360, 27a44dfea7cd2d30e488194c34ab473c
+0,         16,         16,        1,     9360, fc7b56bd95e990a33cf575d1ef820902
+0,         17,         17,        1,     9360, fa2d1609e69714dffc410e65f3c8b755
+0,         18,         18,        1,     9360, 705d7429f447cb13febe202d567795f2
+0,         19,         19,        1,     9360, 234802ce86e868faaf2cd40a286846ea
+0,         20,         20,        1,     9360, 2f0354b40d211d0a4ade4568bea4f85e
+0,         21,         21,        1,     9360, e96af3b6c0cc931463ca77d6be0f1148
+0,         22,         22,        1,     9360, 04a904d798361959971361401879c7e4
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diff --git a/tests/ref/fate/mov-tenc-only-encrypted-kid b/tests/ref/fate/mov-tenc-only-encrypted-kid
new file mode 100644
index 0000000000..1d57aa6a80
--- /dev/null
+++ b/tests/ref/fate/mov-tenc-only-encrypted-kid
@@ -0,0 +1,57 @@
+#format: frame checksums
+#version: 2
+#hash: MD5
+#tb 0: 1/24
+#media_type 0: video
+#codec_id 0: rawvideo
+#dimensions 0: 1024x436
+#sar 0: 1/1
+#stream#, dts,        pts, duration,     size, hash
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-- 
2.42.0



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