avformat/webmdashenc: Don't use custom option for bitexactness

The WebM DASH Manifest muxer can write manifests for live streams and
these contain an entry that depends on the time the manifest is written;
an AVOption to make the output reproducible has been added for tests.
But this is unnecessary, as there already is a method for reproducible
output: The AVFMT_FLAG_BITEXACT-flag of the AVFormatContext. Therefore
this commit removes the custom option.

Given that the description of said option contained "private option -
users should never set this" and that it was not documented in
muxers.texi, no deprecation period for this option seemed necessary.

The commands of the FATE-tests for this muxer have been changed to no
longer use this option.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavformat/webmdashenc.c

@@ -57,7 +57,6 @@ typedef struct WebMDashMuxContext {
     char *utc_timing_url;
     double time_shift_buffer_depth;
     int minimum_update_period;
-    int debug_mode;
 } WebMDashMuxContext;
 
 static const char *get_codec_name(int codec_id)
@@ -114,7 +113,7 @@ static int write_header(AVFormatContext *s)
         if (!strftime(gmt_iso, 21, "%Y-%m-%dT%H:%M:%SZ", gmt)) {
             return AVERROR_UNKNOWN;
         }
-        if (w->debug_mode) {
+        if (s->flags & AVFMT_FLAG_BITEXACT) {
             av_strlcpy(gmt_iso, "", 1);
         }
         avio_printf(s->pb, "  availabilityStartTime=\"%s\"\n", gmt_iso);
@@ -553,7 +552,6 @@ static int webm_dash_manifest_write_packet(AVFormatContext *s, AVPacket *pkt)
 #define OFFSET(x) offsetof(WebMDashMuxContext, x)
 static const AVOption options[] = {
     { "adaptation_sets", "Adaptation sets. Syntax: id=0,streams=0,1,2 id=1,streams=3,4 and so on", OFFSET(adaptation_sets), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
-    { "debug_mode", "[private option - users should never set this]. Create deterministic output", OFFSET(debug_mode), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
     { "live", "create a live stream manifest", OFFSET(is_live), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
     { "chunk_start_index",  "start index of the chunk", OFFSET(chunk_start_index), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
     { "chunk_duration_ms", "duration of each chunk (in milliseconds)", OFFSET(chunk_duration), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },

tests/fate/vpx.mak

@@ -71,10 +71,10 @@ FATE_VP8-$(CONFIG_WEBM_DASH_MANIFEST_DEMUXER) += fate-webm-dash-manifest-represe
 fate-webm-dash-manifest-representations: CMD = run $(FFMPEG) -nostdin -f webm_dash_manifest -i $(TARGET_SAMPLES)/vp8/dash_video1.webm -f webm_dash_manifest -i $(TARGET_SAMPLES)/vp8/dash_video4.webm -c copy -map 0 -map 1 -f webm_dash_manifest -adaptation_sets "id=0,streams=0,1" -
 
 FATE_VP8-$(CONFIG_WEBM_DASH_MANIFEST_DEMUXER) += fate-webm-dash-manifest-live
-fate-webm-dash-manifest-live: CMD = run $(FFMPEG) -nostdin -f webm_dash_manifest -live 1 -i $(TARGET_SAMPLES)/vp8/dash_live_video_360.hdr -f webm_dash_manifest -live 1 -i $(TARGET_SAMPLES)/vp8/dash_live_audio_171.hdr -c copy -map 0 -map 1 -f webm_dash_manifest -live 1 -adaptation_sets "id=0,streams=0 id=1,streams=1" -chunk_start_index 1 -chunk_duration_ms 5000 -time_shift_buffer_depth 7200 -minimum_update_period 60 -debug_mode 1 -
+fate-webm-dash-manifest-live: CMD = run $(FFMPEG) -nostdin -f webm_dash_manifest -live 1 -i $(TARGET_SAMPLES)/vp8/dash_live_video_360.hdr -f webm_dash_manifest -live 1 -i $(TARGET_SAMPLES)/vp8/dash_live_audio_171.hdr -c copy -map 0 -map 1 -fflags +bitexact -f webm_dash_manifest -live 1 -adaptation_sets "id=0,streams=0 id=1,streams=1" -chunk_start_index 1 -chunk_duration_ms 5000 -time_shift_buffer_depth 7200 -minimum_update_period 60 -
 
 FATE_VP8-$(CONFIG_WEBM_DASH_MANIFEST_DEMUXER) += fate-webm-dash-manifest-live-bandwidth
-fate-webm-dash-manifest-live-bandwidth: CMD = run $(FFMPEG) -nostdin -f webm_dash_manifest -live 1 -bandwidth 100 -i $(TARGET_SAMPLES)/vp8/dash_live_video_360.hdr -f webm_dash_manifest -live 1 -bandwidth 200 -i $(TARGET_SAMPLES)/vp8/dash_live_audio_171.hdr -c copy -map 0 -map 1 -f webm_dash_manifest -live 1 -adaptation_sets "id=0,streams=0 id=1,streams=1" -chunk_start_index 1 -chunk_duration_ms 5000 -time_shift_buffer_depth 7200 -minimum_update_period 60 -debug_mode 1 -
+fate-webm-dash-manifest-live-bandwidth: CMD = run $(FFMPEG) -nostdin -f webm_dash_manifest -live 1 -bandwidth 100 -i $(TARGET_SAMPLES)/vp8/dash_live_video_360.hdr -f webm_dash_manifest -live 1 -bandwidth 200 -i $(TARGET_SAMPLES)/vp8/dash_live_audio_171.hdr -c copy -map 0 -map 1 -fflags +bitexact -f webm_dash_manifest -live 1 -adaptation_sets "id=0,streams=0 id=1,streams=1" -chunk_start_index 1 -chunk_duration_ms 5000 -time_shift_buffer_depth 7200 -minimum_update_period 60 -
 
 FATE_VP8-$(call DEMDEC, MATROSKA, VP8) += fate-vp8-2451
 fate-vp8-2451: CMD = framecrc -flags +bitexact -i $(TARGET_SAMPLES)/vp8/RRSF49-short.webm -vsync cfr -an